[Keyboard] Update Symmetric70 keyboard prototype (#12707)

* update handwired/symmetric70_proto/matrix.c

* make keyboards/handwired/symmetric70_proto/promicro/

* add symmetric70_proto/debug_config.h, update symmetric70_proto/local_features.mk etc.

  set MATRIX_IO_DELAY macro
    make MTEST=mdelay0  symmetric70_proto/promicro:default:flash
    make MTEST=mdelay1  symmetric70_proto/promicro:default:flash
    make MTEST=mdelay10 symmetric70_proto/promicro:default:flash
    make MTEST=mdelay30 symmetric70_proto/promicro:default:flash
  set DEBUG_MATRIX_SCAN_RATE_ENABLE yes
    make MTEST=scan symmetric70_proto/promicro:default:flash
  set MATRIX_DEBUG_DELAY and MATRIX_IO_DELAY macro
    make MTEST=matrix_debug_delay,mdelay0 symmetric70_proto/promicro:default:flash
  set MATRIX_DEBUG_SCAN
    make MTEST=matrix_debug_scan symmetric70_proto/promicro:default:flash

* add symmetric70_proto/matrix_debug/readme.md

* update symmetric70_proto/matrix_debug/readme.md

* update handwired/symmetric70_proto/readme.md

* update handwired/symmetric70_proto/readme.md

* update handwired/symmetric70_proto/*/readme.md

* add handwired/symmetric70_proto/matrix_fast/

* update handwired/symmetric70_proto/matrix_fast/readme.md

* fix typo in handwired/symmetric70_proto/matrix_fast/readme.md

* update config.h under handwired/symmetric70_proto/promicro

* add Proton C support to handwired/symmetric70_proto

* add handwired/symmetric70_proto/proton_c/readme.md

* add promicro/*/readme.md proton_c/*/readme.md

* update handwired/symmetric70_proto/proton_c/proton_c.c

support MATRIX_IO_DELAY_DEFAULT for testing.

* Added another implementation of 'adaptive_delay'.

* update symmetric70_proto/local_features.mk

* update symmetric70_proto/matrix_fast/gpio_extr.h

* add matrix_output_unselect_delay_ports()

* add MTEST=adaptive_delay_fast option

* update symmetric70_proto/matrix_debug/readme.md

* update symmetric70_proto/matrix_fast/readme.md

* update symmetric70_proto/matrix_debug/readme.md

* Erase garbage

* fix symmetric70_proto/proton_c/proton_c.c

* improve adaptive_delay_fast in symmetric70_proto/matrix_debug/matrix.c

* update symmetric70_proto/matrix_debug/readme.md

* fix symmetric70_proto/matrix_debug/readme.md

* Update keyboards/handwired/symmetric70_proto/proton_c/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/handwired/symmetric70_proto/proton_c/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/handwired/symmetric70_proto/local_features.mk

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/local_features.mk

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/local_features.mk

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/readme.md

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/readme.md

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_debug/readme.md

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Update keyboards/handwired/symmetric70_proto/matrix_fast/matrix_config_expand.c

Co-authored-by: Nick Brassel <nick@tzarc.org>

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>

35 files changed, 1865 insertions, 64 deletions

diff --git a/keyboards/handwired/symmetric70_proto/debug_config.h b/keyboards/handwired/symmetric70_proto/debug_config.h
new file mode 100644
index 0000000000..cba99e402f
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/debug_config.h
@@ -0,0 +1,33 @@
+/*
+ * matrix.c testing macros
+ *   MATRIX_DEBUG_SCAN:  Measuring execution time of `matrix_scan()`
+ *   MATRIX_DEBUG_DELAY: Observation of delay after `unselect_row()`
+ */
+#pragma once
+#ifndef __ASSEMBLER__
+#include <gpio.h>
+
+static inline void setDebugPinOutput_Low(void) {
+    setPinOutput(MATRIX_DEBUG_PIN);
+    writePinLow(MATRIX_DEBUG_PIN);
+}
+
+#define MATRIX_DEBUG_PIN_INIT()   setDebugPinOutput_Low()
+
+#ifdef MATRIX_DEBUG_SCAN
+#  define MATRIX_DEBUG_SCAN_START() writePinHigh(MATRIX_DEBUG_PIN)
+#  define MATRIX_DEBUG_SCAN_END()   writePinLow(MATRIX_DEBUG_PIN)
+#else
+#  define MATRIX_DEBUG_SCAN_START()
+#  define MATRIX_DEBUG_SCAN_END()
+#endif
+
+#ifdef MATRIX_DEBUG_DELAY
+#  define MATRIX_DEBUG_DELAY_START() writePinHigh(MATRIX_DEBUG_PIN)
+#  define MATRIX_DEBUG_DELAY_END()   writePinLow(MATRIX_DEBUG_PIN)
+#else
+#  define MATRIX_DEBUG_DELAY_START()
+#  define MATRIX_DEBUG_DELAY_END()
+#endif
+
+#endif // __ASSEMBLER__
diff --git a/keyboards/handwired/symmetric70_proto/local_features.mk b/keyboards/handwired/symmetric70_proto/local_features.mk
new file mode 100644
index 0000000000..e5cd31a615
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/local_features.mk
@@ -0,0 +1,108 @@
+# matrix.c testing options
+#  set MATRIX_IO_DELAY macro
+#    make MTEST=mdelay0   symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+#    make MTEST=mdelay=1  symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+#    make MTEST=mdelay=10  symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+#  set DEBUG_MATRIX_SCAN_RATE_ENABLE yes
+#    make MTEST=scan symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+#  set MATRIX_DEBUG_DELAY and MATRIX_IO_DELAY macro
+#    make MTEST=matrix_debug_delay,mdelay0 symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+#  set MATRIX_DEBUG_SCAN
+#    make MTEST=matrix_debug_scan symmetric70_proto/{promicro|proton_c}/{fast|normal}:default:flash
+
+ifneq ($(strip $(MTEST)),)
+  define KEYBOARD_OPTION_PARSE
+    # parse 'consle', 'scan', 'no-scan', 'mdelay=?', 'mdelay0',
+    #       'adaptive_delay', 'always_delay', 'matrix_debug_delay', 'matrix_debug_scan'
+    $(if $(SHOW_PARSE),$(info parse .$1.))  #for debug  'make SHOW_PARSE=y ...'
+    ifeq ($(strip $1),console)
+        CONSOLE_ENABLE = yes
+    endif
+    ifeq ($(strip $1),scan)
+        DEBUG_MATRIX_SCAN_RATE_ENABLE = yes
+    endif
+    ifeq ($(strip $1),no-scan)
+        DEBUG_MATRIX_SCAN_RATE_ENABLE = no
+    endif
+    ifneq ($(filter mdelay=%,$1),)
+        MDELAY = $(patsubst mdelay=%,%,$1)
+    endif
+    ifeq ($(strip $1),mdelay0)
+        MDELAY = 0
+    endif
+    ifeq ($(strip $1),common_delay)
+        MATRIX_COMMON_DELAY = yes
+    endif
+    ifeq ($(strip $1),adaptive_delay)
+        ADAPTIVE_DELAY = yes
+    endif
+    ifeq ($(strip $1),adaptive_delay2)
+        ADAPTIVE_DELAY2 = yes
+    endif
+    ifeq ($(strip $1),adaptive_delay_fast)
+        ADAPTIVE_DELAY_FAST = yes
+    endif
+    ifeq ($(strip $1),always_delay)
+        ALWAYS_DELAY = yes
+    endif
+    ifeq ($(strip $1),matrix_debug_delay)
+        MATRIX_DEBUG_DELAY = yes
+        MATRIX_DEBUG_SCAN = no
+    endif
+    ifeq ($(strip $1),matrix_debug_scan)
+        MATRIX_DEBUG_DELAY = no
+        MATRIX_DEBUG_SCAN = yes
+    endif
+  endef # end of KEYMAP_OPTION_PARSE
+
+  COMMA=,
+  $(eval $(foreach A_OPTION_NAME,$(subst $(COMMA), ,$(MTEST)),  \
+      $(call KEYBOARD_OPTION_PARSE,$(A_OPTION_NAME))))
+endif
+
+ifneq ($(strip $(MDELAY)),)
+    OPT_DEFS += -DMATRIX_IO_DELAY=$(strip $(MDELAY))
+endif
+
+ifeq ($(strip $(ADAPTIVE_DELAY)),yes)
+    OPT_DEFS += -DMATRIX_IO_DELAY_ADAPTIVE
+endif
+
+ifeq ($(strip $(ADAPTIVE_DELAY2)),yes)
+    OPT_DEFS += -DMATRIX_IO_DELAY_ADAPTIVE2
+endif
+
+ifeq ($(strip $(ADAPTIVE_DELAY_FAST)),yes)
+    OPT_DEFS += -DMATRIX_IO_DELAY_ADAPTIVE_FAST
+endif
+
+ifeq ($(strip $(ALWAYS_DELAY)),yes)
+    OPT_DEFS += -DMATRIX_IO_DELAY_ALWAYS
+endif
+
+ifeq ($(strip $(MATRIX_DEBUG_DELAY)),yes)
+    OPT_DEFS += -DMATRIX_DEBUG_DELAY
+    DEBUG_CONFIG = yes
+endif
+
+ifeq ($(strip $(MATRIX_DEBUG_SCAN)),yes)
+    OPT_DEFS += -DMATRIX_DEBUG_SCAN
+    DEBUG_CONFIG = yes
+endif
+
+ifeq ($(strip $(DEBUG_CONFIG)),yes)
+    # include "debug_config.h" from {promicro|proton_c}/config.h
+    OPT_DEFS += -DDEBUG_CONFIG
+endif
+
+ifeq ($(strip $(MATRIX_COMMON_DELAY)),yes)
+    # use matrix_output_unselect_delay() in matrix_common.c
+    OPT_DEFS += -DMATRIX_IO_DELAY_DEFAULT
+endif
+
+$(info -)
+$(info -  DEBUG_MATRIX_SCAN_RATE_ENABLE = $(DEBUG_MATRIX_SCAN_RATE_ENABLE))
+$(info -  CONSOLE_ENABLE      = $(CONSOLE_ENABLE))
+$(info -  MDELAY              = $(MDELAY))
+$(info -  MATRIX_COMMON_DELAY = $(MATRIX_COMMON_DELAY))
+$(info -  OPT_DEFS            = $(OPT_DEFS))
diff --git a/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h b/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h
new file mode 100644
index 0000000000..c7d08309d0
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_debug/gpio_extr.h
@@ -0,0 +1,10 @@
+#pragma once
+// clang-format off
+
+#if defined(__AVR__)
+#    define readPort(port) PINx_ADDRESS(port)
+typedef uint8_t     port_data_t;
+#else
+#    define readPort(qmk_pin) palReadPort(PAL_PORT(qmk_pin))
+typedef uint16_t     port_data_t;
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/matrix.c b/keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c
index c016120737..c84efe2915 100644
--- a/keyboards/handwired/symmetric70_proto/matrix.c
+++ b/keyboards/handwired/symmetric70_proto/matrix_debug/matrix.c
@@ -20,6 +20,24 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "matrix.h"
 #include "debounce.h"
 #include "quantum.h"
+#ifndef readPort
+#    include "gpio_extr.h"
+#endif
+
+#ifndef MATRIX_DEBUG_PIN
+#    define MATRIX_DEBUG_PIN_INIT()
+#    define MATRIX_DEBUG_SCAN_START()
+#    define MATRIX_DEBUG_SCAN_END()
+#    define MATRIX_DEBUG_DELAY_START()
+#    define MATRIX_DEBUG_DELAY_END()
+#    define MATRIX_DEBUG_GAP()
+#else
+#    define MATRIX_DEBUG_GAP()  asm volatile("nop \n nop":::"memory")
+#endif
+
+#ifndef MATRIX_IO_DELAY_ALWAYS
+#    define MATRIX_IO_DELAY_ALWAYS 0
+#endif
 
 #ifdef DIRECT_PINS
 static pin_t direct_pins[MATRIX_ROWS][MATRIX_COLS] = DIRECT_PINS;
@@ -28,16 +46,32 @@ static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
 static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
 #  ifdef MATRIX_MUL_SELECT
 static const pin_t col_sel[MATRIX_COLS] = MATRIX_MUL_SEL;
-#    ifndef MATRIX_MUL_SELECT_DELAY
-#      define MATRIX_MUL_SELECT_DELAY 1
-#    endif
 #  endif
 #endif
 
+#ifdef MATRIX_IO_DELAY_PORTS
+static const pin_t delay_ports[] = { MATRIX_IO_DELAY_PORTS };
+static const port_data_t delay_masks[] = { MATRIX_IO_DELAY_MASKS };
+#    ifdef MATRIX_IO_DELAY_MULSEL
+static const uint8_t delay_sel[] = { MATRIX_IO_DELAY_MULSEL };
+#    endif
+#endif
+
 /* matrix state(1:on, 0:off) */
 extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
 extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
 
+static inline void setPinOutput_writeLow(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON {
+        setPinOutput(pin);
+        writePinLow(pin);
+    }
+}
+
+static inline void setPinInputHigh_atomic(pin_t pin) {
+    ATOMIC_BLOCK_FORCEON { setPinInputHigh(pin); }
+}
+
 // matrix code
 
 #ifdef DIRECT_PINS
@@ -75,16 +109,13 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 #elif defined(DIODE_DIRECTION)
 #    if (DIODE_DIRECTION == COL2ROW)
 
-static void select_row(uint8_t row) {
-    setPinOutput(row_pins[row]);
-    writePinLow(row_pins[row]);
-}
+static void select_row(uint8_t row) { setPinOutput_writeLow(row_pins[row]); }
 
-static void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
+static void unselect_row(uint8_t row) { setPinInputHigh_atomic(row_pins[row]); }
 
 static void unselect_rows(void) {
     for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
-        setPinInputHigh(row_pins[x]);
+        setPinInputHigh_atomic(row_pins[x]);
     }
 }
 
@@ -95,7 +126,7 @@ static void init_pins(void) {
 #endif
     unselect_rows();
     for (uint8_t x = 0; x < MATRIX_COLS; x++) {
-        setPinInputHigh(col_pins[x]);
+        setPinInputHigh_atomic(col_pins[x]);
     }
 }
 
@@ -103,16 +134,16 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
     // Start with a clear matrix row
     matrix_row_t current_row_value = 0;
 
-    // Select row and wait for row selecton to stabilize
+    // Select row
     select_row(current_row);
-    matrix_io_delay();
+    matrix_output_select_delay();
 
     // For each col...
     for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
         // Select the col pin to read (active low)
 #ifdef MATRIX_MUL_SELECT
         writePin(MATRIX_MUL_SELECT,col_sel[col_index]);
-        __builtin_avr_delay_cycles(MATRIX_MUL_SELECT_DELAY);
+        waitInputPinDelay();
 #endif
         uint8_t pin_state = readPin(col_pins[col_index]);
 
@@ -122,6 +153,60 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
     // Unselect row
     unselect_row(current_row);
+#ifdef MATRIX_IO_DELAY_PORTS
+    if (current_row_value) {  // wait for col signal to go HIGH
+        bool is_pressed;
+        do {
+            MATRIX_DEBUG_DELAY_START();
+            is_pressed = false;
+            for (uint8_t i = 0; i < sizeof(delay_ports)/sizeof(pin_t); i++ ) {
+#    ifdef MATRIX_IO_DELAY_MULSEL
+                writePin(MATRIX_MUL_SELECT, delay_sel[i]);
+                waitInputPinDelay();
+#    endif
+                is_pressed |= ( (readPort(delay_ports[i]) & delay_masks[i]) != delay_masks[i] );
+            }
+            MATRIX_DEBUG_DELAY_END();
+        } while (is_pressed);
+    }
+#endif
+#ifdef MATRIX_IO_DELAY_ADAPTIVE
+    if (current_row_value) {  // wait for col signal to go HIGH
+        for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+            MATRIX_DEBUG_DELAY_START();
+#ifdef MATRIX_MUL_SELECT
+            writePin(MATRIX_MUL_SELECT,col_sel[col_index]);
+            waitInputPinDelay();
+#endif
+            while (readPin(col_pins[col_index]) == 0) {}
+            MATRIX_DEBUG_DELAY_END();
+        }
+    }
+#endif
+#ifdef MATRIX_IO_DELAY_ADAPTIVE2
+    if (current_row_value) {  // wait for col signal to go HIGH
+        pin_t state;
+        do {
+            MATRIX_DEBUG_DELAY_START();
+            state = 0;
+            for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
+                MATRIX_DEBUG_DELAY_END();
+                MATRIX_DEBUG_DELAY_START();
+#ifdef MATRIX_MUL_SELECT
+                writePin(MATRIX_MUL_SELECT,col_sel[col_index]);
+                waitInputPinDelay();
+#endif
+                state |= (readPin(col_pins[col_index]) == 0);
+            }
+            MATRIX_DEBUG_DELAY_END();
+        } while (state);
+    }
+#endif
+    if (MATRIX_IO_DELAY_ALWAYS || current_row + 1 < MATRIX_ROWS) {
+        MATRIX_DEBUG_DELAY_START();
+        matrix_output_unselect_delay();  // wait for col signal to go HIGH
+        MATRIX_DEBUG_DELAY_END();
+    }
 
     // If the row has changed, store the row and return the changed flag.
     if (current_matrix[current_row] != current_row_value) {
@@ -133,32 +218,29 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 
 #    elif (DIODE_DIRECTION == ROW2COL)
 
-static void select_col(uint8_t col) {
-    setPinOutput(col_pins[col]);
-    writePinLow(col_pins[col]);
-}
+static void select_col(uint8_t col) { setPinOutput_writeLow(col_pins[col]); }
 
-static void unselect_col(uint8_t col) { setPinInputHigh(col_pins[col]); }
+static void unselect_col(uint8_t col) { setPinInputHigh_atomic(col_pins[col]); }
 
 static void unselect_cols(void) {
     for (uint8_t x = 0; x < MATRIX_COLS; x++) {
-        setPinInputHigh(col_pins[x]);
+        setPinInputHigh_atomic(col_pins[x]);
     }
 }
 
 static void init_pins(void) {
     unselect_cols();
     for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
-        setPinInputHigh(row_pins[x]);
+        setPinInputHigh_atomic(row_pins[x]);
     }
 }
 
 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
     bool matrix_changed = false;
 
-    // Select col and wait for col selecton to stabilize
+    // Select col
     select_col(current_col);
-    matrix_io_delay();
+    matrix_output_select_delay();
 
     // For each row...
     for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
@@ -184,6 +266,9 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 
     // Unselect col
     unselect_col(current_col);
+    if (MATRIX_IO_DELAY_ALWAYS || current_col + 1 < MATRIX_COLS) {
+        matrix_output_unselect_delay();  // wait for col signal to go HIGH
+    }
 
     return matrix_changed;
 }
@@ -195,7 +280,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 #    error DIODE_DIRECTION is not defined!
 #endif
 
-void matrix_init_custom(void) {
+void matrix_init(void) {
     // initialize key pins
     init_pins();
 
@@ -205,22 +290,35 @@ void matrix_init_custom(void) {
         matrix[i]     = 0;
     }
 
+    debounce_init(MATRIX_ROWS);
+
+    matrix_init_quantum();
 }
 
-bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+uint8_t matrix_scan(void) {
     bool changed = false;
+    MATRIX_DEBUG_PIN_INIT();
 
+    MATRIX_DEBUG_SCAN_START();
 #if defined(DIRECT_PINS) || (DIODE_DIRECTION == COL2ROW)
     // Set row, read cols
     for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
-        changed |= read_cols_on_row(current_matrix, current_row);
+        changed |= read_cols_on_row(raw_matrix, current_row);
     }
 #elif (DIODE_DIRECTION == ROW2COL)
     // Set col, read rows
     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
-        changed |= read_rows_on_col(current_matrix, current_col);
+        changed |= read_rows_on_col(raw_matrix, current_col);
     }
 #endif
+    MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP();
+
+    MATRIX_DEBUG_SCAN_START();
+    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+    MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP();
 
-    return changed;
+    MATRIX_DEBUG_SCAN_START();
+    matrix_scan_quantum();
+    MATRIX_DEBUG_SCAN_END();
+    return (uint8_t)changed;
 }
diff --git a/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md b/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md
new file mode 100644
index 0000000000..3e45db87e9
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_debug/readme.md
@@ -0,0 +1,200 @@
+# Debug version matrix.c
+
+This matrix.c is quantum/matrix.c with the following additions:
+
+* Added the MATRIX_DEBUG_SCAN_{START/END} macro to measure the execution time of matrix_scan().
+* Added the MATRIX_DEBUG_DELAY_{START/END} macro to measure delay time.
+* Added the MATRIX_MUL_SELECT handling for symmetric70_proto.
+
+## Compile
+
+* Set MATRIX_IO_DELAY value
+  * `make MTEST=mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=1 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=2 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=3 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=4 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=5 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=10 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=20 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=mdelay=30 handwired/symmetric70_proto/promicro/normal:default:flash`
+* Measure the execution time of matrix_scan()
+  * `make MTEST=matrix_debug_scan[,<other options>..] handwired/symmetric70_proto/promicro/normal:default:flash`
+* Measure delay time.
+  * `make MTEST=matrix_debug_delay[,<other options>..] handwired/symmetric70_proto/promicro/normal:default:flash`
+* Change the behavior of delay
+  * `make MTEST=matrix_debug_delay,always_delay handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=matrix_debug_delay,adaptive_delay,mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash`
+  * `make MTEST=matrix_debug_delay,adaptive_delay_fast,mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash`
+
+## Measurement result
+### Pro Micro (ATmega32u4 16Mhz)
+#### Default setting (show `matrix_scan()` time)
+ - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/promicro/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  503us
+ - Frequency of matrix scan 1.81kHz (551.0us)  
+   ![DS1Z_QuickPrint2](https://user-images.githubusercontent.com/2170248/115994477-0ba64400-a612-11eb-98ba-b8cc362f26ac.png)
+
+#### Always call `matrix_output_unselect_delay()` (show `matrix_scan()` time, default MATRIX_IO_DELAY)
+ - `make MTEST=matrix_debug_scan,always_delay handwired/symmetric70_proto/promicro/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  521us
+ - Frequency of matrix scan 1.76kHz (568.5us)  
+   ![DS1Z_QuickPrint1](https://user-images.githubusercontent.com/2170248/115994488-1660d900-a612-11eb-83b1-cd820607db03.png)
+
+#### Adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay handwired/symmetric70_proto/promicro/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  383us
+ - Frequency of matrix scan 2.32kHz (431us)  
+   ![DS1Z_QuickPrint3](https://user-images.githubusercontent.com/2170248/115994939-034f0880-a614-11eb-861f-b83a31efa51a.png)
+
+#### Adaptive delay (show delay time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay handwired/symmetric70_proto/promicro/normal:default:flash`
+
+##### Press R0C1, R1C1 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Delay time 68us
+ - Frequency of matrix scan 1.77kHz (565us)  
+   ![DS1Z_QuickPrint55](https://user-images.githubusercontent.com/2170248/119561268-ead33900-bddf-11eb-9cc4-7e04826486cf.png)
+
+#### Fast adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/promicro/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  382us
+ - Frequency of matrix scan 2.33kHz (428us)  
+   ![DS1Z_QuickPrint56](https://user-images.githubusercontent.com/2170248/119561280-eeff5680-bddf-11eb-9576-e4cf64751955.png)
+
+#### Fast adaptive delay (show delay time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/promicro/normal:default:flash`
+
+##### Press R0C1, R1C1 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Delay time 11us
+ - Frequency of matrix scan 2.21kHz (452us)  
+   ![DS1Z_QuickPrint57](https://user-images.githubusercontent.com/2170248/119561318-faeb1880-bddf-11eb-8592-694f9ecb2248.png)
+
+### Proton C (STM32F303 72MHz)
+#### Default setting (show `matrix_scan()` time)
+ - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/proton_c/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  210us
+ - Frequency of matrix scan 4.35kHz (230.0us)  
+   ![DS1Z_QuickPrint16](https://user-images.githubusercontent.com/2170248/116131295-2ad2cd80-a707-11eb-8d0a-6f7912456e03.png)
+
+#### Always call `matrix_output_unselect_delay()` (show `matrix_scan()` time, default MATRIX_IO_DELAY)
+ - `make MTEST=matrix_debug_scan,always_delay handwired/symmetric70_proto/proton_c/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  242us
+ - Frequency of matrix scan 3.85kHz (260.0us)  
+   ![DS1Z_QuickPrint17](https://user-images.githubusercontent.com/2170248/116131308-31f9db80-a707-11eb-8db7-d1960fa7b068.png)
+
+#### Adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay handwired/symmetric70_proto/proton_c/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  76.4us
+ - Frequency of matrix scan 10.6kHz (94.4us)  
+   ![DS1Z_QuickPrint18](https://user-images.githubusercontent.com/2170248/116131369-44741500-a707-11eb-9c74-fa39d9e80947.png)
+
+#### Adaptive delay (show delay time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay handwired/symmetric70_proto/proton_c/normal:default:flash`
+
+##### Press R0C1, R1C1 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Delay time 7.6us
+ - Frequency of matrix scan 9.47kHz (105.6us)  
+   ![DS1Z_QuickPrint58](https://user-images.githubusercontent.com/2170248/119666783-a3e15400-be70-11eb-9a58-220032117efd.png)
+
+##### Connect a 500pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 2
+ - CH4: delay time
+ - Delay time 12us + alpha
+ - Frequency of matrix scan 5.45kHz (183us)
+ - Threshold Voltage 1.9V  
+   ![DS1Z_QuickPrint59](https://user-images.githubusercontent.com/2170248/119666946-cc694e00-be70-11eb-9b97-4c500416d774.png)
+
+##### Connect a 1000pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 2
+ - CH4: delay time
+ - Delay time 20us + alpha
+ - Frequency of matrix scan 4.48kHz (223us)
+ - Threshold Voltage 1.9V  
+   ![DS1Z_QuickPrint60](https://user-images.githubusercontent.com/2170248/119667127-f3c01b00-be70-11eb-8e7f-6f0a81f95e97.png)
+
+#### Fast adaptive delay (show `matrix_scan()` time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_scan,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/proton_c/normal:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  75.6us
+ - Frequency of matrix scan 10.8kHz (92.2us)  
+   ![DS1Z_QuickPrint62](https://user-images.githubusercontent.com/2170248/119667218-0b979f00-be71-11eb-946c-16f0a0454056.png)
+
+#### Fast adaptive delay (show delay time, MATRIX_IO_DELAY = 0)
+ - `make MTEST=matrix_debug_delay,mdelay0,adaptive_delay_fast handwired/symmetric70_proto/proton_c/normal:default:flash`
+
+##### Press R0C1, R1C1 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Delay time 1.6us
+ - Frequency of matrix scan 10.6kHz (94.4us)  
+   ![DS1Z_QuickPrint63](https://user-images.githubusercontent.com/2170248/119667378-33870280-be71-11eb-95aa-64213138ddac.png)
+   ![DS1Z_QuickPrint64](https://user-images.githubusercontent.com/2170248/119667504-52859480-be71-11eb-963e-eebc6e3da9dc.png)
+
+##### Connect a 500pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 2
+ - CH4: delay time
+ - Delay time 13.2us
+ - Frequency of matrix scan 6.58kHz (152.6us)
+ - Threshold Voltage 1.9V  
+   ![DS1Z_QuickPrint65](https://user-images.githubusercontent.com/2170248/119667644-72b55380-be71-11eb-8030-854de1900408.png)
+
+##### Connect a 1000pF capacitor between C2 line and GND, Press R0C2, R1C2, R2C2, R3C2, R4C2 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 2
+ - CH4: delay time
+ - Delay time 20us
+ - Frequency of matrix scan 5.30kHz (188.8us)
+ - Threshold Voltage 1.9V  
+   ![DS1Z_QuickPrint66](https://user-images.githubusercontent.com/2170248/119667785-8f518b80-be71-11eb-8d40-fc3293aa072b.png)
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/cpp_map.h b/keyboards/handwired/symmetric70_proto/matrix_fast/cpp_map.h
new file mode 100644
index 0000000000..d197be6d9f
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/cpp_map.h
@@ -0,0 +1,53 @@
+/* Copyright 2021 mtei
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+// clang-format off
+
+#define _MAP1(E, _1) E(_1)
+#define _MAP2(E, _1,_2) E(_1) E(_2)
+#define _MAP3(E, _1,_2,_3) E(_1) E(_2) E(_3)
+#define _MAP4(E, _1,_2,_3,_4) E(_1) E(_2) E(_3) E(_4)
+#define _MAP5(E, _1,_2,_3,_4,_5) E(_1) E(_2) E(_3) E(_4) E(_5)
+#define _MAP6(E, _1,_2,_3,_4,_5,_6) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6)
+#define _MAP7(E, _1,_2,_3,_4,_5,_6,_7) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7)
+#define _MAP8(E, _1,_2,_3,_4,_5,_6,_7,_8) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8)
+#define _MAP9(E, _1,_2,_3,_4,_5,_6,_7,_8,_9) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9)
+#define _MAP10(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10)
+#define _MAP11(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11)
+#define _MAP12(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12)
+#define _MAP13(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13)
+#define _MAP14(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14)
+#define _MAP15(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15)
+#define _MAP16(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16)
+#define _MAP17(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17)
+#define _MAP18(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18)
+#define _MAP19(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19)
+#define _MAP20(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20)
+#define _MAP21(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21)
+#define _MAP22(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22)
+#define _MAP23(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23)
+#define _MAP24(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24)
+#define _MAP25(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25)
+#define _MAP26(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26)
+#define _MAP27(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27)
+#define _MAP28(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27) E(_28)
+#define _MAP29(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27) E(_28) E(_29)
+#define _MAP30(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29,_30) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27) E(_28) E(_29) E(_30)
+#define _MAP31(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29,_30,_31) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27) E(_28) E(_29) E(_30) E(_31)
+#define _MAP32(E, _1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29,_30,_31,_32) E(_1) E(_2) E(_3) E(_4) E(_5) E(_6) E(_7) E(_8) E(_9) E(_10) E(_11) E(_12) E(_13) E(_14) E(_15) E(_16) E(_17) E(_18) E(_19) E(_20) E(_21) E(_22) E(_23) E(_24) E(_25) E(_26) E(_27) E(_28) E(_29) E(_30) E(_31) E(_32)
+
+#define SELECT_MAP(e,_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,_21,_22,_23,_24,_25,_26,_27,_28,_29,_30,_31,_32,NAME,...) NAME
+#define MAP(E,...) SELECT_MAP(E,__VA_ARGS__,_MAP32,_MAP31,_MAP30,_MAP29,_MAP28,_MAP27,_MAP26,_MAP25,_MAP24,_MAP23,_MAP22,_MAP21,_MAP20,_MAP19,_MAP18,_MAP17,_MAP16,_MAP15,_MAP14,_MAP13,_MAP12,_MAP11,_MAP10,_MAP9,_MAP8,_MAP7,_MAP6,_MAP5,_MAP4,_MAP3,_MAP2,_MAP1)(E,__VA_ARGS__)
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/gpio_extr.h b/keyboards/handwired/symmetric70_proto/matrix_fast/gpio_extr.h
new file mode 100644
index 0000000000..e31cb5f3a5
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/gpio_extr.h
@@ -0,0 +1,28 @@
+#pragma once
+// clang-format off
+
+#if defined(__AVR__)
+typedef uint8_t     port_data_t;
+
+#define readPort(port)                 PINx_ADDRESS(port)
+
+#define setPortBitInput(port, bit)     (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
+#define setPortBitInputHigh(port, bit) (DDRx_ADDRESS(port) &= ~_BV((bit)&0xF), PORTx_ADDRESS(port) |= _BV((bit)&0xF))
+#define setPortBitOutput(port, bit)    (DDRx_ADDRESS(port) |= _BV((bit)&0xF))
+
+#define writePortBitLow(port, bit)     (PORTx_ADDRESS(port) &= ~_BV((bit)&0xF))
+#define writePortBitHigh(port, bit)    (PORTx_ADDRESS(port) |= _BV((bit)&0xF))
+
+#else
+typedef uint16_t     port_data_t;
+
+#define readPort(qmk_pin)                 palReadPort(PAL_PORT(qmk_pin))
+
+#define setPortBitInput(qmk_pin, bit)     palSetPadMode(PAL_PORT(qmk_pin), bit, PAL_MODE_INPUT)
+#define setPortBitInputHigh(qmk_pin, bit) palSetPadMode(PAL_PORT(qmk_pin), bit, PAL_MODE_INPUT_PULLUP)
+#define setPortBitInputLow(qmk_pin, bit)  palSetPadMode(PAL_PORT(qmk_pin), bit, PAL_MODE_INPUT_PULLDOWN)
+#define setPortBitOutput(qmk_pin, bit)    palSetPadMode(PAL_PORT(qmk_pin), bit, PAL_MODE_OUTPUT_PUSHPULL)
+
+#define writePortBitLow(qmk_pin, bit)     palClearLine(PAL_LINE(PAL_PORT(qmk_pin), bit))
+#define writePortBitHigh(qmk_pin, bit)    palSetLine(PAL_LINE(PAL_PORT(qmk_pin), bit))
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/matrix.c b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix.c
new file mode 100644
index 0000000000..cb21bfcf8d
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix.c
@@ -0,0 +1,234 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// clang-format off
+#include <stdint.h>
+#include <stdbool.h>
+#include <gpio.h>
+#ifndef readPort
+#    include "gpio_extr.h"
+#endif
+#include "util.h"
+#include "matrix.h"
+#include "matrix_extr.h"
+#include "debounce.h"
+#include "quantum.h"
+
+#define ALWAYS_INLINE inline __attribute__((always_inline))
+#define NO_INLINE     __attribute__((noinline))
+#define LOCAL_FUNC static
+#define LOCAL_DATA static
+
+#ifndef _BV
+#    define _BV(bit) (1 << (bit))
+#endif
+
+#ifndef MATRIX_DEBUG_PIN
+#    define MATRIX_DEBUG_PIN_INIT()
+#    define MATRIX_DEBUG_SCAN_START()
+#    define MATRIX_DEBUG_SCAN_END()
+#    define MATRIX_DEBUG_DELAY_START()
+#    define MATRIX_DEBUG_DELAY_END()
+#    define MATRIX_DEBUG_GAP()
+#else
+#    define MATRIX_DEBUG_GAP()  asm volatile("nop \n nop":::"memory")
+#endif
+
+typedef uint16_t     port_width_t;
+#if MATRIX_TYPE == DIRECT_SWITCH || MATRIX_TYPE == DIODE_COL2ROW
+#    define MATRIX_LINES MATRIX_ROWS
+typedef matrix_row_t matrix_line_t;
+#endif
+#if MATRIX_TYPE == DIODE_ROW2COL
+#    define MATRIX_LINES MATRIX_COLS
+typedef matrix_col_t matrix_line_t;
+#endif
+typedef struct _port_descriptor {
+    int device;
+    pin_t port;
+} port_descriptor;
+
+/* matrix state(1:on, 0:off) */
+extern matrix_row_t raw_matrix[MATRIX_ROWS];  // raw values
+extern matrix_row_t matrix[MATRIX_ROWS];      // debounced values
+
+#define setPortBitOutput_writeLow(port, bit) \
+    do { setPortBitOutput(port, bit); writePortBitLow(port, bit); } while(0)
+#define setPortBitOutput_writeLow_atomic(port, bit) \
+    do { ATOMIC_BLOCK_FORCEON { setPortBitOutput_writeLow(port, bit); } } while(0)
+#define setPortBitInputHigh_atomic(port, bit) \
+    do { ATOMIC_BLOCK_FORCEON { setPortBitInputHigh(port, bit); } } while(0)
+
+#if defined(MATRIX_IN_PORTS) && defined(MATRIX_IN_PINS)
+#   include "matrix_config_expand.c"
+#else
+#   error matrix.c need defined MATRIX_IN_PORTS and MATRIX_IN_PINS
+#endif
+
+LOCAL_FUNC
+void unselect_output(uint8_t out_index) {
+    unselect_output_inline(out_index);
+}
+
+LOCAL_FUNC
+void init_output_ports(void) {
+    for (int i = 0; i < END_outpin_index; i++) {
+        unselect_output(i);
+    }
+}
+
+LOCAL_FUNC
+void init_all_ports(void) {
+    init_input_ports();
+    init_output_ports();
+    init_inport_mask();
+    init_extension();
+}
+
+LOCAL_FUNC ALWAYS_INLINE void select_line_and_read_input_ports(uint8_t current_line, port_width_t port_buffer[NUM_OF_INPUT_PORTS]);
+LOCAL_FUNC void select_line_and_read_input_ports(uint8_t current_line, port_width_t port_buffer[NUM_OF_INPUT_PORTS]) {
+    // Select row (or col)
+    select_output(current_line);
+    matrix_output_select_delay();
+
+    // Read ports
+    read_all_input_ports(port_buffer, false);
+
+    // Unselect row (or col)
+    unselect_output_inline(current_line);
+}
+
+LOCAL_FUNC ALWAYS_INLINE void read_matrix_line(matrix_line_t phy_matrix[], uint8_t current_line);
+
+#if MATRIX_TYPE == DIODE_ROW2COL || MATRIX_TYPE == DIODE_COL2ROW
+LOCAL_FUNC void read_matrix_line(matrix_line_t phy_matrix[], uint8_t current_line) {
+    // Start with a clear matrix row
+    matrix_line_t current_line_value = 0;
+    port_width_t port_buffer[NUM_OF_INPUT_PORTS];
+
+#ifdef MATRIX_GPIO_NEED_SEPARATE_ATOMIC
+    select_line_and_read_input_ports(current_line, port_buffer);
+#else
+    ATOMIC_BLOCK_FORCEON {
+        select_line_and_read_input_ports(current_line, port_buffer);
+    }
+#endif
+
+    // Build row (or col)
+    current_line_value = build_matrix_line(port_buffer);
+
+    // Wait signal raise up
+    if (current_line_value) {
+        MATRIX_DEBUG_DELAY_START();
+        wait_unselect_done();
+        MATRIX_DEBUG_DELAY_END();
+    }
+    phy_matrix[current_line] = current_line_value;
+}
+#endif // MATRIX_TYPE == DIODE_ROW2COL || MATRIX_TYPE == DIODE_COL2ROW
+
+#if MATRIX_TYPE == DIRECT_SWITCH
+LOCAL_FUNC void read_matrix_line(matrix_line_t phy_matrix[], uint8_t current_line) {
+    port_width_t port_buffer[NUM_OF_INPUT_PORTS];
+
+    if (current_line != 0) {
+        return;
+    }
+
+    for (uint8_t i = 0; i < MATRIX_LINES; i++) {
+        phy_matrix[i] = 0;
+    }
+
+    read_all_input_ports(port_buffer, false);
+
+    // Build matrix
+    build_matrix_direct(port_buffer, phy_matrix);
+}
+#endif // MATRIX_TYPE == DIRECT_SWITCH
+
+void matrix_init(void) {
+    // initialize key pins
+    init_all_ports();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        raw_matrix[i] = 0;
+        matrix[i]     = 0;
+    }
+
+    debounce_init(MATRIX_ROWS);
+
+    matrix_init_quantum();
+}
+
+uint8_t matrix_scan(void) {
+    matrix_line_t phy_matrix[MATRIX_LINES];
+
+    MATRIX_DEBUG_PIN_INIT();
+
+    MATRIX_DEBUG_SCAN_START();
+
+    // read I/O port to phy_matrix[] (physical matrix)
+    //select line, read inputs
+    for (uint8_t current_line = 0; current_line < MATRIX_LINES; current_line++) {
+        read_matrix_line(phy_matrix, current_line);
+    }
+    MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP(); MATRIX_DEBUG_SCAN_START();
+
+    bool changed = false;
+#if MATRIX_TYPE == DIRECT_SWITCH || MATRIX_TYPE == DIODE_COL2ROW
+    // copy phy_matrix[] to raw_matrix[]
+    for (uint8_t current_line = 0; current_line < MATRIX_ROWS; current_line++) {
+        if (raw_matrix[current_line] != phy_matrix[current_line]) {
+            changed = true;
+            raw_matrix[current_line] = phy_matrix[current_line];
+        }
+    }
+#endif
+#if MATRIX_TYPE == DIODE_ROW2COL
+    // transpose phy_matrix[] to raw_matrix[]
+    matrix_row_t trans_matrix[MATRIX_ROWS];
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++ ) {
+        trans_matrix[i] = 0;
+    }
+    for (uint8_t src_line = 0; src_line < MATRIX_LINES; src_line++) {
+        matrix_line_t src_line_data = phy_matrix[src_line];
+        matrix_row_t dist_bit = MATRIX_ROW_SHIFTER << src_line;
+        for (uint8_t dist_rows = 0; dist_rows < MATRIX_ROWS; dist_rows++) {
+            if ((src_line_data & 1) == 1) {
+                trans_matrix[dist_rows] |= dist_bit;
+            }
+            src_line_data >>= 1;
+        }
+    }
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        if (raw_matrix[current_row] != trans_matrix[current_row]) {
+            changed = true;
+            raw_matrix[current_row] = trans_matrix[current_row];
+        }
+    }
+#endif
+    MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP(); MATRIX_DEBUG_SCAN_START();
+
+    // debounce raw_matrix[] to matrix[]
+    debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+    MATRIX_DEBUG_SCAN_END(); MATRIX_DEBUG_GAP();
+
+    MATRIX_DEBUG_SCAN_START();
+    matrix_scan_quantum();
+    MATRIX_DEBUG_SCAN_END();
+    return (uint8_t)changed;
+}
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_config_expand.c b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_config_expand.c
new file mode 100644
index 0000000000..0df605db47
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_config_expand.c
@@ -0,0 +1,234 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// clang-format off
+
+#include "matrix_extr.h"
+
+#ifdef DEBUG_MATRIX_CONFIG
+// config expand debug
+//   avr-gcc -DDEBUG_MATRIX_CONFIG=\"test_config.h\" -E -C matrix_config_expand.c
+#    include DEBUG_MATRIX_CONFIG
+#endif
+
+#undef NO_PIN /* cancel NO_PIN define in tmk_core/common/pin_defs.h */
+#define NO_PIN  NO_PORT, 0
+#if MATRIX_TYPE == DIRECT_SWITCH
+#    undef MATRIX_OUT_PORTS
+#    define MATRIX_OUT_PINS  (0, NO_PIN)
+#endif
+
+#include "cpp_map.h"
+
+#if defined(MATRIX_EXTENSION_74HC157) || defined(MATRIX_EXTENSION_74HC153)
+#   define  MATRIX_EXTENSION "matrix_extension_74hc15x.c"
+#endif
+
+#ifdef MATRIX_EXTENSION
+#    include MATRIX_EXTENSION
+#endif
+
+#ifdef MATRIX_GPIO_NEED_SEPARATE_ATOMIC
+#    ifndef setMatrixInputHigh
+#        define setMatrixInputHigh(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitInputHigh_atomic(port, bit); }} while(0)
+#    endif
+#    ifndef setMatrixOutput_writeHighZ
+#        define setMatrixOutput_writeHighZ(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitInputHigh_atomic(port, bit); }} while(0)
+#    endif
+#    ifndef setMatrixOutput_writeLow
+#        define setMatrixOutput_writeLow(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitOutput_writeLow_atomic(port, bit); }} while(0)
+#    endif
+#else
+#    ifndef setMatrixInputHigh
+#        define setMatrixInputHigh(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitInputHigh(port, bit); }} while(0)
+#    endif
+#    ifndef setMatrixOutput_writeHighZ
+#        define setMatrixOutput_writeHighZ(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitInputHigh(port, bit); }} while(0)
+#    endif
+#    ifndef setMatrixOutput_writeLow
+#        define setMatrixOutput_writeLow(dev, port, bit) do { if ((dev) == MCU_GPIO) { setPortBitOutput_writeLow(port, bit); }} while(0)
+#    endif
+#endif
+
+#ifndef readMatrixPort
+#    define readMatrixPort(dev, port) (((dev) == MCU_GPIO) ? readPort(port) : 0)
+#endif
+#ifndef getMatrixInputMaskBit
+#    define getMatrixInputMaskBit(dev, bit) (((dev) != NO_DEVICE) ? _BV((bit)&0xF) : 0)
+#endif
+
+#ifndef init_extension
+#    define init_extension()
+#endif
+
+enum DEVICE_NAME {
+    MCU_GPIO,
+    NO_DEVICE,
+#ifdef MATRIX_DEVICES
+    MATRIX_DEVICES
+#endif
+};
+
+#define _INPUT_PORTS_ENUM_ELEMENT(name, dev, port) inport_index_##name,
+#define INPUT_PORTS_ENUM_ELEMENT(x) _INPUT_PORTS_ENUM_ELEMENT x
+enum INPUT_PORTS {
+    INPUT_PORTS_ENUM_ELEMENT((NO_PORT, NO_DEVICE, 0))
+    MAP(INPUT_PORTS_ENUM_ELEMENT, MATRIX_IN_PORTS)
+    NUM_OF_INPUT_PORTS
+};
+
+#define _INPUT_PINS_ENUM_ELEMENT(index, port, bit) inpin_index_##index,
+#define INPUT_PINS_ENUM_ELEMENT(x) _INPUT_PINS_ENUM_ELEMENT x
+enum INPUT_PINS {
+    MAP(INPUT_PINS_ENUM_ELEMENT, MATRIX_IN_PINS)
+    END_inpin_index
+};
+
+#define _OUTPUT_PORTS_ENUM_ELEMENT(name, dev, port) outport_index_##name,
+#define OUTPUT_PORTS_ENUM_ELEMENT(x) _OUTPUT_PORTS_ENUM_ELEMENT x
+enum OUTPUT_PORTS {
+    OUTPUT_PORTS_ENUM_ELEMENT((NO_PORT, NO_DEVICE, 0))
+#ifdef MATRIX_OUT_PORTS
+    MAP(OUTPUT_PORTS_ENUM_ELEMENT, MATRIX_OUT_PORTS)
+#endif
+    NUM_OF_OUTPUT_PORTS
+};
+
+#define _OUTPUT_PINS_ENUM_ELEMENT(index, port, bit) outpin_index_##index,
+#define OUTPUT_PINS_ENUM_ELEMENT(x) _OUTPUT_PINS_ENUM_ELEMENT x
+enum OUTPUT_PINS {
+    MAP(OUTPUT_PINS_ENUM_ELEMENT, MATRIX_OUT_PINS)
+    END_outpin_index
+};
+
+port_width_t iport_mask[NUM_OF_INPUT_PORTS];
+
+#define _INPUT_PORTS_LIST_ELEMENT(name, dev, port) \
+    [inport_index_##name] = { dev, port },
+#define INPUT_PORTS_LIST_ELEMENT(x) _INPUT_PORTS_LIST_ELEMENT x
+LOCAL_DATA
+const port_descriptor inport_list[NUM_OF_INPUT_PORTS] = {
+    INPUT_PORTS_LIST_ELEMENT((NO_PORT, NO_DEVICE, 0))
+    MAP(INPUT_PORTS_LIST_ELEMENT, MATRIX_IN_PORTS)
+};
+
+#define _OUTPUT_PORTS_LIST_ELEMENT(name, dev, port) \
+    [outport_index_##name] = { dev, port },
+#define OUTPUT_PORTS_LIST_ELEMENT(x) _OUTPUT_PORTS_LIST_ELEMENT x
+LOCAL_DATA
+const port_descriptor outport_list[NUM_OF_OUTPUT_PORTS] = {
+    OUTPUT_PORTS_LIST_ELEMENT((NO_PORT, NO_DEVICE, 0))
+#ifdef MATRIX_OUT_PORTS
+    MAP(OUTPUT_PORTS_LIST_ELEMENT, MATRIX_OUT_PORTS)
+#endif
+};
+
+#define _SELECT_OUTPUT_PIN(index, pname, bit) \
+    case outpin_index_##index: \
+        setMatrixOutput_writeLow(outport_list[outport_index_##pname].device,     \
+                                 outport_list[outport_index_##pname].port, bit); \
+    break;
+#define SELECT_OUTPUT_PIN(x) _SELECT_OUTPUT_PIN x
+LOCAL_FUNC ALWAYS_INLINE void select_output(uint8_t out_index);
+LOCAL_FUNC
+void select_output(uint8_t out_index) {
+    switch (out_index) {
+        MAP(SELECT_OUTPUT_PIN, MATRIX_OUT_PINS)
+    }
+}
+
+#define _UNSELECT_OUTPUT_PIN(index, pname, bit) \
+    case outpin_index_##index: \
+        setMatrixOutput_writeHighZ(outport_list[outport_index_##pname].device,     \
+                                   outport_list[outport_index_##pname].port, bit); \
+    break;
+#define UNSELECT_OUTPUT_PIN(x) _UNSELECT_OUTPUT_PIN x
+LOCAL_FUNC ALWAYS_INLINE void unselect_output_inline(uint8_t out_index);
+LOCAL_FUNC
+void unselect_output_inline(uint8_t out_index) {
+    switch (out_index) {
+        MAP(UNSELECT_OUTPUT_PIN, MATRIX_OUT_PINS)
+    }
+}
+
+#define _INIT_INPUT_PIN(index, pname, bit) \
+    setMatrixInputHigh(inport_list[inport_index_##pname].device,    \
+                       inport_list[inport_index_##pname].port, bit);
+#define INIT_INPUT_PIN(x) _INIT_INPUT_PIN x
+LOCAL_FUNC
+void init_input_ports(void) {
+    MAP(INIT_INPUT_PIN, MATRIX_IN_PINS)
+}
+
+#define _INIT_INPORT_MASK(index, pname, bit) \
+    iport_mask[inport_index_##pname] |= getMatrixInputMaskBit(inport_list[inport_index_##pname].device, bit);
+#define INIT_INPORT_MASK(x)  _INIT_INPORT_MASK x
+LOCAL_FUNC
+void init_inport_mask(void) {
+    for (int i = 0; i < NUM_OF_INPUT_PORTS; i++ ) {
+        iport_mask[i] = 0;
+    }
+    MAP(INIT_INPORT_MASK, MATRIX_IN_PINS)
+}
+
+#define _READ_INPUT_PORT(name, dev, port) \
+    buffer[inport_index_##name] = readMatrixPort(dev, port);
+#define READ_INPUT_PORT(x) _READ_INPUT_PORT x
+LOCAL_FUNC
+ALWAYS_INLINE void read_all_input_ports(port_width_t buffer[NUM_OF_INPUT_PORTS], bool wait_unselect);
+LOCAL_FUNC
+void read_all_input_ports(port_width_t buffer[NUM_OF_INPUT_PORTS], bool wait_unselect) {
+    READ_INPUT_PORT((NO_PORT, NO_DEVICE, 0))
+    MAP(READ_INPUT_PORT, MATRIX_IN_PORTS)
+}
+
+#define _MASK_INPUT(name, dev, port) \
+    mask |= ((~buffer[inport_index_##name]) & iport_mask[inport_index_##name]);
+#define MASK_INPUT(x) _MASK_INPUT x
+LOCAL_FUNC ALWAYS_INLINE void wait_unselect_done(void);
+LOCAL_FUNC
+void wait_unselect_done(void) {
+    port_width_t mask;
+    port_width_t buffer[NUM_OF_INPUT_PORTS];
+    do {
+        read_all_input_ports(buffer, true);
+        MATRIX_DEBUG_DELAY_END();
+        mask = 0;
+        MAP(MASK_INPUT, MATRIX_IN_PORTS);
+        MATRIX_DEBUG_DELAY_START();
+    } while (mask != 0);
+}
+
+#define _BUILD_INPUT_PORT(index, pname, bit) \
+    result |= (buffer[inport_index_##pname] & _BV(bit)) ? 0 : _BV(inpin_index_##index);
+#define BUILD_INPUT_PORT(x) _BUILD_INPUT_PORT x
+LOCAL_FUNC ALWAYS_INLINE matrix_line_t build_matrix_line(port_width_t buffer[NUM_OF_INPUT_PORTS]);
+LOCAL_FUNC
+matrix_line_t build_matrix_line(port_width_t buffer[NUM_OF_INPUT_PORTS]) {
+    matrix_line_t result = 0;
+    MAP(BUILD_INPUT_PORT, MATRIX_IN_PINS);
+    return result;
+}
+
+#define _BUILD_INPUT_PORT_DIRECT(index, pname, bit) \
+    matrix[(inpin_index_##index)/MATRIX_COLS] \
+        |= (buffer[inport_index_##pname] & _BV(bit)) ? 0 : _BV((inpin_index_##index)%MATRIX_COLS);
+#define BUILD_INPUT_PORT_DIRECT(x) _BUILD_INPUT_PORT_DIRECT x
+LOCAL_FUNC ALWAYS_INLINE void build_matrix_direct(port_width_t buffer[NUM_OF_INPUT_PORTS], matrix_line_t matrix[]);
+LOCAL_FUNC
+void build_matrix_direct(port_width_t buffer[NUM_OF_INPUT_PORTS], matrix_line_t matrix[]) {
+    MAP(BUILD_INPUT_PORT_DIRECT, MATRIX_IN_PINS);
+}
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extension_74hc15x.c b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extension_74hc15x.c
new file mode 100644
index 0000000000..bca53da24c
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extension_74hc15x.c
@@ -0,0 +1,72 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+// clang-format off
+
+#if defined(MATRIX_EXTENSION_74HC157)
+#    define MATRIX_DEVICES MCU_GPIOa, MCU_GPIOb
+#    define IS_74HC15x(dev) ((dev)==MCU_GPIOa || (dev)==MCU_GPIOb)
+#    define MATRIX_EXT_74HC15x MATRIX_EXTENSION_74HC157
+#elif defined(MATRIX_EXTENSION_74HC153)
+#    define MATRIX_DEVICES MCU_GPIOa, MCU_GPIOb, MCU_GPIOc, MCU_GPIOd
+#    define IS_74HC15x(dev) ((dev)==MCU_GPIOa || (dev)==MCU_GPIOb || (dev)==MCU_GPIOc || (dev)==MCU_GPIOd)
+#    define MATRIX_EXT_74HC15x MATRIX_EXTENSION_74HC153
+#endif
+
+static const pin_t sel_pins[] = { MATRIX_EXT_74HC15x };
+
+#ifdef MATRIX_GPIO_NEED_SEPARATE_ATOMIC
+#    define setMatrixInputHigh(dev, port, bit) \
+    do {                                            \
+        if ((dev) == MCU_GPIO || IS_74HC15x(dev)) { \
+            setPortBitInputHigh_atomic(port, bit);  \
+        }
+    } while(0)
+#else
+#    define setMatrixInputHigh(dev, port, bit) \
+    do {                                            \
+        if ((dev) == MCU_GPIO || IS_74HC15x(dev)) { \
+            setPortBitInputHigh(port, bit);         \
+        }                                           \
+    } while(0)
+#endif
+
+LOCAL_FUNC ALWAYS_INLINE void select74HC15x(uint8_t devid);
+LOCAL_FUNC
+void select74HC15x(uint8_t devid) {
+    writePin(sel_pins[0], devid&1);
+#if defined(MATRIX_EXTENSION_74HC153)
+    writePin(sel_pins[1], devid&2);
+#endif
+}
+
+LOCAL_FUNC ALWAYS_INLINE port_width_t readPortMultiplexer(uint8_t devid, pin_t port);
+LOCAL_FUNC port_width_t readPortMultiplexer(uint8_t devid, pin_t port) {
+    select74HC15x(devid);
+    waitInputPinDelay();
+    return readPort(port);
+}
+
+#define readMatrixPort(dev, port) \
+    ((dev) == MCU_GPIO)? readPort(port): (IS_74HC15x(dev))? readPortMultiplexer((dev)-MCU_GPIOa, port):0
+
+#define INIT_74HC15X(x) setPinOutput(x); writePinLow(x);
+LOCAL_FUNC
+void init_74hc15x(void) {
+    MAP(INIT_74HC15X, MATRIX_EXT_74HC15x)
+}
+#define init_extension() init_74hc15x()
+
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extr.h b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extr.h
new file mode 100644
index 0000000000..e0cf528919
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/matrix_extr.h
@@ -0,0 +1,36 @@
+#pragma once
+// clang-format off
+
+#define DIRECT_SWITCH 1
+#define DIODE_ROW2COL 2
+#define DIODE_COL2ROW 3
+
+#ifndef ROW2COL
+#    define COL2ROW 0
+#    define ROW2COL 1
+#endif
+
+#ifdef DIRECT_PINS
+#    define MATRIX_TYPE DIRECT_SWITCH
+#else
+#    if DIODE_DIRECTION == ROW2COL
+#        define MATRIX_TYPE DIODE_ROW2COL
+#    endif
+#    if DIODE_DIRECTION == COL2ROW
+#        define MATRIX_TYPE DIODE_COL2ROW
+#    endif
+#endif
+
+#ifndef MATRIX_TYPE
+#   error "MATRIX_TYPE could not be determined."
+#endif
+
+#if (MATRIX_ROWS <= 8)
+typedef uint8_t matrix_col_t;
+#elif (MATRIX_ROWS <= 16)
+typedef uint16_t matrix_col_t;
+#elif (MATRIX_ROWS <= 32)
+typedef uint32_t matrix_col_t;
+#else
+#    error "MATRIX_ROWS: invalid value"
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md b/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md
new file mode 100644
index 0000000000..dc744a4c46
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/readme.md
@@ -0,0 +1,168 @@
+# Fast and extensible matrix.c
+
+This matrix.c is faster and more extensible than the standard quantum/matrix.c.
+
+* The execution speed of the `matrix_scan()` function is several times faster than quantum/matrix.c.
+* In addition to handling MCU GPIOs, it can be extended to handle I/O extenders.
+
+## ToDo list
+- [x] support Pro Micro
+- [x] support Proton-C
+- [x] support DIRECT_PINS
+- [x] support DIODE_DIRECTION == ROW2COL
+- [x] support 74HC157: quadruple 2-line to 1-line data selectors / multiplexers
+- [x] support 74HC153: dual 4-line to 1-line data selectors / multiplexers
+- [ ] support I/O expander (MCP23018)
+- [ ] support MCU & I/O expander (MCP23018) mixture like ErgoDox
+
+## Configuration
+
+This matrix.c requires a different configuration than quantum/matrix.c.
+
+### Output pins configuration
+
+The output pins is the Row pins if `DIODE_DIRECTION == COL2ROW`, and the Col pins if `DIODE_DIRECTION == ROW2COL`. When DIRECT_PINS is defined, the output pins do not need to be set.
+
+Example:
+```c
+// list of OUTPUT(row) ports
+#define MATRIX_OUT_PORTS  \
+    (Port_D, MCU_GPIO, D0), \
+    (Port_C, MCU_GPIO, C0), \
+    (Port_E, MCU_GPIO, E0), \
+    (Port_B, MCU_GPIO, B0)
+// list of OUTPUT pins
+#define MATRIX_OUT_PINS  \
+    (0, Port_D, 4), \
+    (1, Port_C, 6), \
+    (2, Port_D, 7), \
+    (3, Port_E, 6), \
+    (4, Port_B, 4), \
+    (5, Port_B, 5)
+```
+
+### Input pins configuration
+
+The input pins is the Col pins if `DIODE_DIRECTION == COL2ROW`, and the Row pins if `DIODE_DIRECTION == ROW2COL`. When DIRECT_PINS is defined, the input pin settings will enumerate the connection pins of all switches.
+
+Example:
+```c
+// list of INPUT ports
+#define MATRIX_IN_PORTS (Port_F, MCU_GPIO, F0), (Port_B, MCU_GPIO, B0)
+// list of INPUT pins
+#define MATRIX_IN_PINS \
+    (0, Port_F, 4), \
+    (1, Port_F, 5), \
+    (2, Port_F, 6), \
+    (3, Port_F, 7), \
+    (4, Port_B, 1), \
+    (5, Port_B, 3)
+```
+
+### Multiplexer Extension
+
+By defining the `MATRIX_EXTENSION_74HC157` macro or `MATRIX_EXTENSION_74HC153` macro, you can connect a multiplexer to the GPIO to extend the input pins.
+
+Example:
+```c
+#define MATRIX_EXTENSION_74HC157 B2 /* or #define MATRIX_EXTENSION_74HC153 B2, B6 */
+
+// list of OUTPUT ports
+#define MATRIX_OUT_PORTS (Port_D, MCU_GPIO, D0), (Port_C, MCU_GPIO, C0), (Port_E, MCU_GPIO, E0), (Port_B, MCU_GPIO, B0)
+// list of OUTPUT pins
+#define MATRIX_OUT_PINS  (0, Port_D, 4), (1, Port_C, 6), (2, Port_D, 7), (3, Port_E, 6), (4, Port_B, 4), (5, Port_B, 5)
+
+// list of INPUT ports
+#define MATRIX_IN_PORTS \
+    (Port_Fa, MCU_GPIOa, F0), \
+    (Port_Ba, MCU_GPIOa, B0), \
+    (Port_Fb, MCU_GPIOb, F0), \
+    (Port_Bb, MCU_GPIOb, B0)
+// list of INPUT pins
+#define MATRIX_IN_PINS \
+    (0, Port_Fa, 4), \
+    (1, Port_Fb, 5), \
+    (2, Port_Fb, 6), \
+    (3, Port_Fa, 7), \
+    (4, Port_Ba, 1), \
+    (5, Port_Bb, 3)
+```
+
+### I/O expander Extension
+
+I plan to provide extensions to support I/O expanders such as MCP23018 and PCA9555.
+
+## Compile
+
+* Measure the execution time of matrix_scan()
+  * `make MTEST=matrix_debug_scan[,<other options>..] handwired/symmetric70_proto/promicro/fast:default:flash`
+* Measure delay time.
+  * `make MTEST=matrix_debug_delay[,<other options>..] handwired/symmetric70_proto/promicro/fast:default:flash`
+
+## Measurement result
+### Pro Micro (ATmega32u4 16Mhz)
+#### Default setting (show `matrix_scan()` time)
+ - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/promicro/fast:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  75.6us
+ - Frequency of matrix scan 8.09kHz (123.6us)
+ ![DS1Z_QuickPrint7](https://user-images.githubusercontent.com/2170248/116003927-538d9100-a63b-11eb-9b36-7db47d9b1541.png)
+
+#### Default setting (show delay time)
+ - `make MTEST=matrix_debug_delay handwired/symmetric70_proto/promicro/fast:default:flash`
+##### Press R0C0 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Frequency of matrix scan 7.84kHz (127.6us)
+
+![DS1Z_QuickPrint9](https://user-images.githubusercontent.com/2170248/116003974-99e2f000-a63b-11eb-9c9e-3b3b1025db66.png)
+![DS1Z_QuickPrint10](https://user-images.githubusercontent.com/2170248/116003978-a1a29480-a63b-11eb-97d8-5a6e11c0db2f.png)
+
+### Proton C
+#### Default setting (show `matrix_scan()` time)
+ - `make MTEST=matrix_debug_scan handwired/symmetric70_proto/proton_c/fast:default:flash`
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: matrix_scan()
+ - Execution time of matrix_scan()  49.8us
+ - Frequency of matrix scan 15.1kHz (66.2.6us)
+
+![DS1Z_QuickPrint11](https://user-images.githubusercontent.com/2170248/116088141-8cca0d80-a6dc-11eb-8782-1d29c57690b8.png)
+
+#### Default setting (show delay time)
+ - `make MTEST=matrix_debug_delay handwired/symmetric70_proto/proton_c/fast:default:flash`
+##### Press R0C0 key
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Row 4
+ - CH4: delay time
+ - Frequency of matrix scan 13.9kHz (71.8us)
+
+![DS1Z_QuickPrint12](https://user-images.githubusercontent.com/2170248/116088247-a8cdaf00-a6dc-11eb-8a47-104694a40117.png)
+![DS1Z_QuickPrint13](https://user-images.githubusercontent.com/2170248/116088262-ac613600-a6dc-11eb-804c-7dcbd71c83d5.png)
+
+##### Connect a 500pF capacitor between C0 line and GND, Press R0C0, R1C0, R2C0,  R3C0,  R4C0 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 0
+ - CH4: delay time
+ - Delay time 11.6us
+ - Threshold Voltage 1.9V
+
+![DS1Z_QuickPrint14](https://user-images.githubusercontent.com/2170248/116089205-90aa5f80-a6dd-11eb-89c4-72315c80ba0e.png)
+
+##### Connect a 1000pF capacitor between C0 line and GND, Press R0C0, R1C0, R2C0,  R3C0,  R4C0 keys
+ - CH1: Row 0
+ - CH2: Row 1
+ - CH3: Col 0
+ - CH4: delay time
+ - Delay time 18.6us
+ - Threshold Voltage 1.9V
+
+![DS1Z_QuickPrint15](https://user-images.githubusercontent.com/2170248/116089229-96a04080-a6dd-11eb-8b63-f91b03a9db0c.png)
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/test_config.h b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config.h
new file mode 100644
index 0000000000..25b5d4e018
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config.h
@@ -0,0 +1,21 @@
+// list of OUTPUT(row) ports
+#define MATRIX_OUT_PORTS (Port_D, MCU_GPIO, D0), (Port_C, MCU_GPIO, C0), (Port_E, MCU_GPIO, E0), (Port_B, MCU_GPIO, B0)
+// list of OUTPUT(row) pins
+#define MATRIX_OUT_PINS  \
+    (0, Port_D, 4), \
+    (1, Port_C, 6), \
+    (2, Port_D, 7), \
+    (3, Port_E, 6), \
+    (4, Port_B, 4), \
+    (5, Port_B, 5)
+
+// list of INPUT(col) ports
+#define MATRIX_IN_PORTS (Port_F, MCU_GPIO, F0), (Port_B, MCU_GPIO, B0)
+// list of INPUT(col) pins
+#define MATRIX_IN_PINS \
+    (0, Port_F, 4), \
+    (1, Port_F, 5), \
+    (2, Port_F, 6), \
+    (3, Port_F, 7), \
+    (4, Port_B, 1), \
+    (5, Port_B, 3)
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_74hc157.h b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_74hc157.h
new file mode 100644
index 0000000000..6abc25b862
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_74hc157.h
@@ -0,0 +1,28 @@
+#define MATRIX_EXTENSION_74HC157 B2
+// #define MATRIX_EXTENSION_74HC153 B2, B6
+
+// list of OUTPUT(row) ports
+#define MATRIX_OUT_PORTS (Port_D, MCU_GPIO, D0), (Port_C, MCU_GPIO, C0), (Port_E, MCU_GPIO, E0), (Port_B, MCU_GPIO, B0)
+// list of OUTPUT(row) pins
+#define MATRIX_OUT_PINS  \
+    (0, Port_D, 4), \
+    (1, Port_C, 6), \
+    (2, Port_D, 7), \
+    (3, Port_E, 6), \
+    (4, Port_B, 4), \
+    (5, Port_B, 5)
+
+// list of INPUT(col) ports
+#define MATRIX_IN_PORTS \
+    (Port_Fa, MCU_GPIOa, F0), \
+    (Port_Ba, MCU_GPIOa, B0), \
+    (Port_Fb, MCU_GPIOb, F0), \
+    (Port_Bb, MCU_GPIOb, B0)
+// list of INPUT(col) pins
+#define MATRIX_IN_PINS \
+    (0, Port_Fa, 4), \
+    (1, Port_Fb, 5), \
+    (2, Port_Fb, 6), \
+    (3, Port_Fa, 7), \
+    (4, Port_Ba, 1), \
+    (5, Port_Bb, 3)
diff --git a/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_direct.h b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_direct.h
new file mode 100644
index 0000000000..aeea12950d
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/matrix_fast/test_config_direct.h
@@ -0,0 +1,34 @@
+#if defined(__AVR__)
+/* -------------------- AVR (Pro Micro) ----------------------- */
+
+// old style
+#define DIRECT_PINS { { F4, NO_PIN, F5 }, { NO_PIN, F6, F7 }, { B1, B3, NO_PIN } }
+
+// new style
+// #define DIRECT_PINS
+#define MATRIX_IN_PORTS \
+    (Port_F, MCU_GPIO, F0), \
+    (Port_B, MCU_GPIO, B0)
+#define MATRIX_IN_PINS  \
+    (0, Port_F,  4), (1, NO_PIN    ), (2, Port_F,  5), \
+    (3, NO_PIN    ), (4, Port_F,  6), (5, Port_F,  7), \
+    (6, Port_B,  1), (7, Port_B,  3), (8, NO_PIN    )
+
+#else
+/* -------------------- ARM (PROTON-C) ----------------------- */
+
+// old style
+#define DIRECT_PINS { { A2, NO_PIN, A1 }, { NO_PIN, A0, B8 }, { B13, B14, NO_PIN } }
+
+// new style
+// #define DIRECT_PINS
+#define MATRIX_IN_PORTS \
+    (Port_A, MCU_GPIO, A0), \
+    (Port_B, MCU_GPIO, B0)
+#define MATRIX_IN_PINS  \
+    (0, Port_A,  2), (1, NO_PIN    ), (2, Port_A,  1), \
+    (3, NO_PIN    ), (4, Port_A,  0), (5, Port_B,  8), \
+    (6, Port_B, 13), (7, Port_B, 14), (8, NO_PIN    )
+
+#endif
+
diff --git a/keyboards/handwired/symmetric70_proto/config.h b/keyboards/handwired/symmetric70_proto/promicro/config.h
index 2cdce5802c..2060c62606 100644
--- a/keyboards/handwired/symmetric70_proto/config.h
+++ b/keyboards/handwired/symmetric70_proto/promicro/config.h
@@ -1,5 +1,5 @@
 /*
-Copyright 2020 mtei
+Copyright 2020-2021 mtei
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -24,29 +24,31 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define PRODUCT_ID   0x2BE5
 #define DEVICE_VER   0x0001
 #define MANUFACTURER mtei
-#define PRODUCT      Symmetric70 prototype
+#define PRODUCT      Symmetric70 prototype promicro
 
 /* key matrix size */
 #define MATRIX_ROWS 5
 #define MATRIX_COLS 16
 
-/*
- * Keyboard Matrix Assignments
- *
- * Change this to how you wired your keyboard
- * COLS: AVR pins used for columns, left to right
- * ROWS: AVR pins used for rows, top to bottom
- * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
- *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
- *
- */
-#define MATRIX_ROW_PINS { D4, C6, D7, E6, B4 }
-#define MATRIX_COL_PINS { F4,F4,F5,F5, F6,F6,F7,F7,  B6,B6,B2,B2, B3,B3,B1,B1 }
-#define UNUSED_PINS
+/* Pro Micro **************************
+                 ====
+         +-------====------+
+  MDEBUG | D3/TXO      RAW |
+         | D2/RXI      GND |
+         | GND         RST |
+         | GND         Vcc |
+         | D1/SDA       F4 | COL_0_1_L
+         | D0/SCL       F5 | COL_2_3_L
+   ROW_0 | D4           F6 | COL_4_5_L
+   ROW_1 | C6           F7 | COL_6_7_L
+   ROW_2 | D7       SCK/B1 | COL_6_7_R
+   ROW_3 | E6      MISO/B3 | COL_4_5_R
+   ROW_4 | B4      MOSI/B2 | COL_2_3_R
+  SEL_AB | B5           B6 | COL_0_1_R
+        +-----------------+
+***************************************/
 
-#define MATRIX_MUL_SEL  {  0, 1, 0, 1,  0, 1, 0, 1,   1, 0, 1, 0,  1, 0, 1, 0 }
-/* use 74HC157: quadruple 2-line to 1-line data selectors / multiplexers */
-#define MATRIX_MUL_SELECT  B5 /* 74HC157 pin1:~A/B */
+#define UNUSED_PINS
 
 /* COL2ROW, ROW2COL */
 #define DIODE_DIRECTION COL2ROW
@@ -148,3 +150,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* Bootmagic Lite key configuration */
 //#define BOOTMAGIC_LITE_ROW 0
 //#define BOOTMAGIC_LITE_COLUMN 0
+
+#ifdef DEBUG_CONFIG
+#    define MATRIX_DEBUG_PIN D3
+#    include "../debug_config.h"
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/promicro/fast/config.h b/keyboards/handwired/symmetric70_proto/promicro/fast/config.h
new file mode 100644
index 0000000000..2553de1ab3
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/fast/config.h
@@ -0,0 +1,52 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#define MATRIX_OUT_PORTS \
+    (Port_D, MCU_GPIO, D0), \
+    (Port_C, MCU_GPIO, C0), \
+    (Port_E, MCU_GPIO, E0), \
+    (Port_B, MCU_GPIO, B0)
+#define MATRIX_OUT_PINS  \
+    (0, Port_D, 4), \
+    (1, Port_C, 6), \
+    (2, Port_D, 7), \
+    (3, Port_E, 6), \
+    (4, Port_B, 4)
+#define MATRIX_EXTENSION_74HC157 B5
+#define MATRIX_IN_PORTS \
+    (Port_Fa, MCU_GPIOa, F0), \
+    (Port_Fb, MCU_GPIOb, F0), \
+    (Port_Ba, MCU_GPIOa, B0), \
+    (Port_Bb, MCU_GPIOb, B0)
+#define MATRIX_IN_PINS \
+    (0, Port_Fa, 4), \
+    (1, Port_Fb, 4), \
+    (2, Port_Fa, 5), \
+    (3, Port_Fb, 5), \
+    (4, Port_Fa, 6), \
+    (5, Port_Fb, 6), \
+    (6, Port_Fa, 7), \
+    (7, Port_Fb, 7), \
+    (8, Port_Bb, 6), \
+    (9, Port_Ba, 6), \
+    (10, Port_Bb, 2), \
+    (11, Port_Ba, 2), \
+    (12, Port_Bb, 3), \
+    (13, Port_Ba, 3), \
+    (14, Port_Bb, 1), \
+    (15, Port_Ba, 1)
diff --git a/keyboards/handwired/symmetric70_proto/promicro/fast/readme.md b/keyboards/handwired/symmetric70_proto/promicro/fast/readme.md
new file mode 100644
index 0000000000..9d1a8d8ebf
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/fast/readme.md
@@ -0,0 +1 @@
+[Look here](../readme.md)
diff --git a/keyboards/handwired/symmetric70_proto/promicro/fast/rules.mk b/keyboards/handwired/symmetric70_proto/promicro/fast/rules.mk
new file mode 100644
index 0000000000..de489fcabd
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/fast/rules.mk
@@ -0,0 +1,6 @@
+CUSTOM_MATRIX = yes
+SRC += matrix_common.c
+SRC += matrix_fast/matrix.c
+
+KEYBOARD_LOCAL_FEATURES_MK := $(dir $(lastword $(MAKEFILE_LIST)))../../local_features.mk
+include $(KEYBOARD_LOCAL_FEATURES_MK)
diff --git a/keyboards/handwired/symmetric70_proto/promicro/normal/config.h b/keyboards/handwired/symmetric70_proto/promicro/normal/config.h
new file mode 100644
index 0000000000..e03f685847
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/normal/config.h
@@ -0,0 +1,41 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { D4, C6, D7, E6, B4 }
+#define MATRIX_COL_PINS { F4,F4,F5,F5, F6,F6,F7,F7,  B6,B6,B2,B2, B3,B3,B1,B1 }
+
+#define MATRIX_MUL_SEL  {  0, 1, 0, 1,  0, 1, 0, 1,   1, 0, 1, 0,  1, 0, 1, 0 }
+/* use 74HC157: quadruple 2-line to 1-line data selectors / multiplexers */
+#define MATRIX_MUL_SELECT  B5 /* 74HC157 pin1:~A/B */
+
+#ifdef MATRIX_IO_DELAY_ADAPTIVE_FAST
+#    define MATRIX_IO_DELAY_PORTS  B0, B0, F0, F0
+#    define MATRIX_IO_DELAY_MULSEL  0,  1,  0,  1
+//                                  76543210    76543210    76543210    76543210
+#    define MATRIX_IO_DELAY_MASKS 0b01001110, 0b01001110, 0b11110000, 0b11110000
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/promicro/normal/readme.md b/keyboards/handwired/symmetric70_proto/promicro/normal/readme.md
new file mode 100644
index 0000000000..9d1a8d8ebf
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/normal/readme.md
@@ -0,0 +1 @@
+[Look here](../readme.md)
diff --git a/keyboards/handwired/symmetric70_proto/promicro/normal/rules.mk b/keyboards/handwired/symmetric70_proto/promicro/normal/rules.mk
new file mode 100644
index 0000000000..0b2b707ef8
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/normal/rules.mk
@@ -0,0 +1,6 @@
+CUSTOM_MATRIX = yes
+SRC += matrix_common.c
+SRC += matrix_debug/matrix.c
+
+KEYBOARD_LOCAL_FEATURES_MK := $(dir $(lastword $(MAKEFILE_LIST)))../../local_features.mk
+include $(KEYBOARD_LOCAL_FEATURES_MK)
diff --git a/keyboards/handwired/symmetric70_proto/promicro/readme.md b/keyboards/handwired/symmetric70_proto/promicro/readme.md
new file mode 100644
index 0000000000..c74063b998
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/promicro/readme.md
@@ -0,0 +1,27 @@
+# Pro Micro version of symmetric70_proto
+
+![symmetric70_proto](https://i.imgur.com/Br4pH9ol.jpg)
+<img width="80%" alt="matrix_74HC157d" src="https://user-images.githubusercontent.com/2170248/115988014-a3943580-a5f2-11eb-9a0a-038f7ea6a8d9.png">
+
+A compact 70keys keyboard (prototype) designed by mtei
+
+* Keyboard Maintainer: [mtei](https://github.com/mtei)
+* Hardware Supported: Pro Micro (ATmega32U4) & 74HC157
+* Hardware Availability: This is just prototype
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/symmetric70_proto/promicro/normal:default
+    make handwired/symmetric70_proto/promicro/fast:default
+
+Flashing example for this keyboard:
+
+    make handwired/symmetric70_proto/promicro/normal:default:flash
+    make handwired/symmetric70_proto/promicro/fast:default:flash
+
+Testing options: (see more options: [local_features.mk](../local_features.mk), [matrix_debug](../matrix_debug/readme.md) and [matrix_fast](../matrix_fast/readme.md) )
+
+    make MTEST=mdelay0 handwired/symmetric70_proto/promicro/normal:default:flash
+    make MTEST=mdelay0 handwired/symmetric70_proto/promicro/fast:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/handwired/symmetric70_proto/rules.mk b/keyboards/handwired/symmetric70_proto/promicro/rules.mk
index 494dc6fbaf..822b1a84d9 100644
--- a/keyboards/handwired/symmetric70_proto/rules.mk
+++ b/keyboards/handwired/symmetric70_proto/promicro/rules.mk
@@ -20,8 +20,3 @@ BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
 RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 BLUETOOTH_ENABLE = no       # Enable Bluetooth
 AUDIO_ENABLE = no           # Audio output
-
-CUSTOM_MATRIX = lite
-SRC += matrix.c
-
-## CONSOLE_ENABLE = yes # matrix dump
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/config.h b/keyboards/handwired/symmetric70_proto/proton_c/config.h
new file mode 100644
index 0000000000..84586854f4
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/config.h
@@ -0,0 +1,165 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID    0xFEED
+#define PRODUCT_ID   0x2BE5
+#define DEVICE_VER   0x0001
+#define MANUFACTURER mtei
+#define PRODUCT      Symmetric70 prototype proton-c
+
+/* key matrix size */
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 16
+
+/* Proton-C **************************
+                 ====
+         +-------====------+
+   DEBUG | A9/TX/SCL2   5V | (VUSB)
+         | A10/RX/SDA2 GND |
+         | GND       FLASH |
+         | GND        3.3V | (VCC)
+     C15 | B7/SDA1      A2 | C0
+     C14 | B6/SCL1      A1 | C1
+     C13 | B5           A0 | C2
+     C12 | B4      SCL1/B8 | C3
+     C11 | B3     SCLK/B13 | C4
+     C10 | B2     MISO/B14 | C5
+     C9  | B1     MOSI/B15 | C6
+     C8  | B0      SDA1/B9 | C7
+         +---+         +---+
+         +---+         +---+
+      R0 | A4          B10 |
+      R1 | A5          B11 |
+      R2 | A6          B12 |
+      R3 | A7          A14 |
+      R4 | A8          A13 |
+         | A15         RST |
+         +-----------------+
+***************************************/
+
+#define UNUSED_PINS
+
+/* COL2ROW, ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/*
+ * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN.
+ */
+//#define SOFT_SERIAL_PIN D0  // or D1, D2, D3, E6
+
+//#define BACKLIGHT_PIN B7
+//#define BACKLIGHT_LEVELS 3
+//#define BACKLIGHT_BREATHING
+
+//#define RGB_DI_PIN E2
+//#ifdef RGB_DI_PIN
+//#    define RGBLED_NUM 16
+//#    define RGBLIGHT_HUE_STEP 8
+//#    define RGBLIGHT_SAT_STEP 8
+//#    define RGBLIGHT_VAL_STEP 8
+//#    define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */
+//#    define RGBLIGHT_SLEEP  /* If defined, the RGB lighting will be switched off when the host goes to sleep */
+/*== all animations enable ==*/
+//#    define RGBLIGHT_ANIMATIONS
+/*== or choose animations ==*/
+//#    define RGBLIGHT_EFFECT_BREATHING
+//#    define RGBLIGHT_EFFECT_RAINBOW_MOOD
+//#    define RGBLIGHT_EFFECT_RAINBOW_SWIRL
+//#    define RGBLIGHT_EFFECT_SNAKE
+//#    define RGBLIGHT_EFFECT_KNIGHT
+//#    define RGBLIGHT_EFFECT_CHRISTMAS
+//#    define RGBLIGHT_EFFECT_STATIC_GRADIENT
+//#    define RGBLIGHT_EFFECT_RGB_TEST
+//#    define RGBLIGHT_EFFECT_ALTERNATING
+/*== customize breathing effect ==*/
+/*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/
+//#    define RGBLIGHT_BREATHE_TABLE_SIZE 256      // 256(default) or 128 or 64
+/*==== use exp() and sin() ====*/
+//#    define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85  // 1 to 2.7
+//#    define RGBLIGHT_EFFECT_BREATHE_MAX    255   // 0 to 255
+//#endif
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
+//#define MATRIX_HAS_GHOST
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* If defined, GRAVE_ESC will always act as ESC when CTRL is held.
+ * This is useful for the Windows task manager shortcut (ctrl+shift+esc).
+ */
+//#define GRAVE_ESC_CTRL_OVERRIDE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
+
+/*
+ * Feature disable options
+ *  These options are also useful to firmware size reduction.
+ */
+
+/* disable debug print */
+//#define NO_DEBUG
+
+/* disable print */
+//#define NO_PRINT
+
+/* disable action features */
+//#define NO_ACTION_LAYER
+//#define NO_ACTION_TAPPING
+//#define NO_ACTION_ONESHOT
+
+/* disable these deprecated features by default */
+#define NO_ACTION_MACRO
+#define NO_ACTION_FUNCTION
+
+/* Bootmagic Lite key configuration */
+//#define BOOTMAGIC_LITE_ROW 0
+//#define BOOTMAGIC_LITE_COLUMN 0
+
+#ifdef DEBUG_CONFIG
+#    define MATRIX_DEBUG_PIN A9
+#    include "../debug_config.h"
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/fast/config.h b/keyboards/handwired/symmetric70_proto/proton_c/fast/config.h
new file mode 100644
index 0000000000..48c3ec1c09
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/fast/config.h
@@ -0,0 +1,44 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+#define MATRIX_OUT_PORTS  (Port_A, MCU_GPIO, A0)
+#define MATRIX_OUT_PINS  \
+    (0, Port_A, 4), \
+    (1, Port_A, 5), \
+    (2, Port_A, 6), \
+    (3, Port_A, 7), \
+    (4, Port_A, 8)
+#define MATRIX_IN_PORTS \
+    (Port_A, MCU_GPIO, A0), (Port_B, MCU_GPIO, B0)
+#define MATRIX_IN_PINS \
+    (0, Port_A, 2), \
+    (1, Port_A, 1), \
+    (2, Port_A, 0), \
+    (3, Port_B, 8), \
+    (4, Port_B, 13), \
+    (5, Port_B, 14), \
+    (6, Port_B, 15), \
+    (7, Port_B, 9), \
+    (8, Port_B, 0), \
+    (9, Port_B, 1), \
+    (10, Port_B, 2), \
+    (11, Port_B, 3), \
+    (12, Port_B, 4), \
+    (13, Port_B, 5), \
+    (14, Port_B, 6), \
+    (15, Port_B, 7)
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/fast/readme.md b/keyboards/handwired/symmetric70_proto/proton_c/fast/readme.md
new file mode 100644
index 0000000000..9d1a8d8ebf
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/fast/readme.md
@@ -0,0 +1 @@
+[Look here](../readme.md)
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/fast/rules.mk b/keyboards/handwired/symmetric70_proto/proton_c/fast/rules.mk
new file mode 100644
index 0000000000..de489fcabd
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/fast/rules.mk
@@ -0,0 +1,6 @@
+CUSTOM_MATRIX = yes
+SRC += matrix_common.c
+SRC += matrix_fast/matrix.c
+
+KEYBOARD_LOCAL_FEATURES_MK := $(dir $(lastword $(MAKEFILE_LIST)))../../local_features.mk
+include $(KEYBOARD_LOCAL_FEATURES_MK)
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/normal/config.h b/keyboards/handwired/symmetric70_proto/proton_c/normal/config.h
new file mode 100644
index 0000000000..942e54c799
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/normal/config.h
@@ -0,0 +1,36 @@
+/*
+Copyright 2021 mtei
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS { A4, A5, A6, A7, A8 }
+#define MATRIX_COL_PINS { A2, A1, A0, B8,  B13, B14, B15, B9,  B0, B1, B2, B3,  B4, B5, B6, B7 }
+
+#ifdef MATRIX_IO_DELAY_ADAPTIVE_FAST
+#    define MATRIX_IO_DELAY_PORTS A0, B0
+//                                  fedcba9876543210    fedcba9876543210
+#    define MATRIX_IO_DELAY_MASKS 0b0000000000000111, 0b1110001111111111
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/normal/readme.md b/keyboards/handwired/symmetric70_proto/proton_c/normal/readme.md
new file mode 100644
index 0000000000..9d1a8d8ebf
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/normal/readme.md
@@ -0,0 +1 @@
+[Look here](../readme.md)
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/normal/rules.mk b/keyboards/handwired/symmetric70_proto/proton_c/normal/rules.mk
new file mode 100644
index 0000000000..0b2b707ef8
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/normal/rules.mk
@@ -0,0 +1,6 @@
+CUSTOM_MATRIX = yes
+SRC += matrix_common.c
+SRC += matrix_debug/matrix.c
+
+KEYBOARD_LOCAL_FEATURES_MK := $(dir $(lastword $(MAKEFILE_LIST)))../../local_features.mk
+include $(KEYBOARD_LOCAL_FEATURES_MK)
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/proton_c.c b/keyboards/handwired/symmetric70_proto/proton_c/proton_c.c
new file mode 100644
index 0000000000..3fe5bc297c
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/proton_c.c
@@ -0,0 +1,12 @@
+#include "quantum.h"
+
+#ifndef MATRIX_IO_DELAY_DEFAULT
+/* In tmk_core/common/wait.h, the implementation for PROTOCOL_CHIBIOS
+ * calls 'chThdSleepMicroseconds(1)' when 'wait_us(0)'.
+ * However, 'wait_us(0)' should do nothing. */
+void matrix_output_unselect_delay(void) {
+#   if !defined(MATRIX_IO_DELAY) || MATRIX_IO_DELAY > 0
+    matrix_io_delay();
+#   endif
+}
+#endif
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/readme.md b/keyboards/handwired/symmetric70_proto/proton_c/readme.md
new file mode 100644
index 0000000000..fc10a2e634
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/readme.md
@@ -0,0 +1,26 @@
+# Proton C version of symmetric70_proto
+
+![symmetric70_proto](https://i.imgur.com/SCtlXOS.jpg)
+
+A compact 70keys keyboard (prototype) designed by mtei
+
+* Keyboard Maintainer: [mtei](https://github.com/mtei)
+* Hardware Supported: Proton C (STM32F303CCT6)
+* Hardware Availability: This is just prototype
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/symmetric70_proto/proton_c/normal:default
+    make handwired/symmetric70_proto/proton_c/fast:default
+
+Flashing example for this keyboard:
+
+    make handwired/symmetric70_proto/proton_c/normal:default:flash
+    make handwired/symmetric70_proto/proton_c/fast:default:flash
+
+Testing options: (see more options: [local_features.mk](../local_features.mk), [matrix_debug](../matrix_debug/readme.md) and [matrix_fast](../matrix_fast/readme.md) )
+
+    make MTEST=mdelay0 handwired/symmetric70_proto/proton_c/normal:default:flash
+    make MTEST=mdelay0 handwired/symmetric70_proto/proton_c/fast:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/handwired/symmetric70_proto/proton_c/rules.mk b/keyboards/handwired/symmetric70_proto/proton_c/rules.mk
new file mode 100644
index 0000000000..e8b0948461
--- /dev/null
+++ b/keyboards/handwired/symmetric70_proto/proton_c/rules.mk
@@ -0,0 +1,23 @@
+# MCU name
+MCU = STM32F303
+BOARD = QMK_PROTON_C
+
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = no        # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+# if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+BLUETOOTH_ENABLE = no       # Enable Bluetooth
+AUDIO_ENABLE = no           # Audio output
diff --git a/keyboards/handwired/symmetric70_proto/readme.md b/keyboards/handwired/symmetric70_proto/readme.md
index 01c2889c27..1bb56cf4f2 100644
--- a/keyboards/handwired/symmetric70_proto/readme.md
+++ b/keyboards/handwired/symmetric70_proto/readme.md
@@ -1,20 +1,8 @@
 # symmetric70_proto
 
 ![symmetric70_proto](https://i.imgur.com/Br4pH9ol.jpg)
-![74HC157_schematic](https://i.imgur.com/8IU8Jgcl.jpg)
 
 A compact 70keys keyboard (prototype) designed by mtei
 
-* Keyboard Maintainer: [mtei](https://github.com/mtei)
-* Hardware Supported: Pro Micro (ATmega32U4) & 74HC157
-* Hardware Availability: This is just prototype
-
-Make example for this keyboard (after setting up your build environment):
-
-    make symmetric70_proto:default
-
-Flashing example for this keyboard:
-
-    make symmetric70_proto:default:flash
-
-See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+* [Pro Micro version of symmetric70_proto](promicro/readme.md)
+* [Proton-C version of symmetric70_proto](proton_c/readme.md)