From c6698cfce314cdc75cdaa06b2440d2ae0c7b6ea2 Mon Sep 17 00:00:00 2001
From: sekigon-gonnoc <43873124+sekigon-gonnoc@users.noreply.github.com>
Date: Wed, 21 Jul 2021 02:24:22 +0900
Subject: [Keyboard] Add keyboard GRS-70EC (#11296)

---
 keyboards/sekigon/grs_70ec/ec_switch_matrix.c | 161 ++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 keyboards/sekigon/grs_70ec/ec_switch_matrix.c

(limited to 'keyboards/sekigon/grs_70ec/ec_switch_matrix.c')

diff --git a/keyboards/sekigon/grs_70ec/ec_switch_matrix.c b/keyboards/sekigon/grs_70ec/ec_switch_matrix.c
new file mode 100644
index 0000000000..88e9bdabdb
--- /dev/null
+++ b/keyboards/sekigon/grs_70ec/ec_switch_matrix.c
@@ -0,0 +1,161 @@
+/* Copyright 2020 sekigon-gonnoc
+ *
+ * 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/>.
+ */
+
+#include "ec_switch_matrix.h"
+
+#include "quantum.h"
+#include "analog.h"
+#include "print.h"
+
+// sensing channel definitions
+#define S0 0
+#define S1 1
+#define S2 2
+#define S3 3
+#define S4 4
+#define S5 5
+#define S6 6
+#define S7 7
+
+// pin connections
+const uint8_t row_pins[]     = MATRIX_ROW_PINS;
+const uint8_t col_channels[] = MATRIX_COL_PINS;
+const uint8_t mux_sel_pins[] = MUX_SEL_PINS;
+
+_Static_assert(sizeof(mux_sel_pins) == 3, "invalid MUX_SEL_PINS");
+
+static ecsm_config_t config;
+static uint16_t      ecsm_sw_value[MATRIX_ROWS][MATRIX_COLS];
+
+static inline void discharge_capacitor(void) { setPinOutput(DISCHARGE_PIN); }
+static inline void charge_capacitor(uint8_t row) {
+    setPinInput(DISCHARGE_PIN);
+    writePinHigh(row_pins[row]);
+}
+
+static inline void clear_all_row_pins(void) {
+    for (int row = 0; row < sizeof(row_pins); row++) {
+        writePinLow(row_pins[row]);
+    }
+}
+
+static inline void init_mux_sel(void) {
+    for (int idx = 0; idx < sizeof(mux_sel_pins); idx++) {
+        setPinOutput(mux_sel_pins[idx]);
+    }
+}
+
+static inline void select_mux(uint8_t col) {
+    uint8_t ch = col_channels[col];
+    writePin(mux_sel_pins[0], ch & 1);
+    writePin(mux_sel_pins[1], ch & 2);
+    writePin(mux_sel_pins[2], ch & 4);
+}
+
+static inline void init_row(void) {
+    for (int idx = 0; idx < sizeof(row_pins); idx++) {
+        setPinOutput(row_pins[idx]);
+        writePinLow(row_pins[idx]);
+    }
+}
+
+// Initialize pins
+int ecsm_init(ecsm_config_t const* const ecsm_config) {
+    // save config
+    config = *ecsm_config;
+
+    // initialize discharge pin as discharge mode
+    writePinLow(DISCHARGE_PIN);
+    setPinOutput(DISCHARGE_PIN);
+
+    // set analog reference
+    analogReference(ADC_REF_POWER);
+
+    // initialize drive lines
+    init_row();
+
+    // initialize multiplexer select pin
+    init_mux_sel();
+
+    // set discharge pin to charge mode
+    setPinInput(DISCHARGE_PIN);
+
+    return 0;
+}
+
+// Read key value of key (row, col)
+uint16_t ecsm_readkey_raw(uint8_t row, uint8_t col) {
+    uint16_t sw_value = 0;
+
+    discharge_capacitor();
+
+    select_mux(col);
+
+    clear_all_row_pins();
+
+    cli();
+
+    charge_capacitor(row);
+
+    sw_value = analogReadPin(ANALOG_PORT);
+
+    sei();
+
+    return sw_value;
+}
+
+// Update press/release state of key at (row, col)
+bool ecsm_update_key(matrix_row_t* current_row, uint8_t col, uint16_t sw_value) {
+    bool current_state = (*current_row >> col) & 1;
+
+    // press to release
+    if (current_state && sw_value < config.low_threshold) {
+        *current_row &= ~(1 << col);
+        return true;
+    }
+
+    // release to press
+    if ((!current_state) && sw_value > config.high_threshold) {
+        *current_row |= (1 << col);
+        return true;
+    }
+
+    return false;
+}
+
+// Scan key values and update matrix state
+bool ecsm_matrix_scan(matrix_row_t current_matrix[]) {
+    bool updated = false;
+
+    for (int col = 0; col < sizeof(col_channels); col++) {
+        for (int row = 0; row < sizeof(row_pins); row++) {
+            ecsm_sw_value[row][col] = ecsm_readkey_raw(row, col);
+            updated |= ecsm_update_key(&current_matrix[row], col, ecsm_sw_value[row][col]);
+        }
+    }
+
+    return updated;
+}
+
+// Print key values
+void ecsm_print_matrix(void) {
+    for (int row = 0; row < sizeof(row_pins); row++) {
+        for (int col = 0; col < sizeof(col_channels); col++) {
+            xprintf("%4d", ecsm_sw_value[row][col]);
+        }
+        xprintf("\n");
+    }
+}
-- 
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