# 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)  #### 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)   ### 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)  #### 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)   ##### 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  ##### 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 