Add EVO70 R2 Keyboard (#21321)

keyboards/custommk/evo70_r2/matrix.c

@@ -0,0 +1,117 @@
+// Copyright 2023 David Hoelscher (@customMK)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include "quantum.h"
+
+// Pin definitions
+static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+
+void matrix_wait_for_pin(pin_t pin, uint8_t target_state) {
+    rtcnt_t start = chSysGetRealtimeCounterX();
+    rtcnt_t end   = start + 5000;
+    while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
+        if (readPin(pin) == target_state) {
+            break;
+        }
+    }
+}
+
+void matrix_wait_for_port(stm32_gpio_t *port, uint32_t target_bitmask) {
+    rtcnt_t start = chSysGetRealtimeCounterX();
+    rtcnt_t end   = start + 5000;
+    while (chSysIsCounterWithinX(chSysGetRealtimeCounterX(), start, end)) {
+        if ((palReadPort(port) & target_bitmask) == target_bitmask) {
+            break;
+        }
+    }
+}
+
+void shift_pulse_clock(void) {
+        writePinHigh(COL_SHIFT_CLK_PIN);
+        matrix_wait_for_pin(COL_SHIFT_CLK_PIN, 1);
+        writePinLow(COL_SHIFT_CLK_PIN);
+}
+
+void matrix_init_custom(void) {
+    //set all row pins as input with pullups
+    for (int i = 0; i < MATRIX_ROWS; ++i) {
+        writePinHigh(row_pins[i]);
+        setPinInputHigh(row_pins[i]);
+    }
+
+    //set all column pins high in ROW2COL matrix
+    setPinOutput(COL_SHIFT_IN_PIN);
+    setPinOutput(COL_SHIFT_CLK_PIN);
+    writePinHigh(COL_SHIFT_IN_PIN);
+    matrix_wait_for_pin(COL_SHIFT_IN_PIN, 1);
+
+    for (int i = 0; i < MATRIX_COLS; ++i) {
+        shift_pulse_clock();
+    }
+
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    static matrix_row_t temp_matrix[MATRIX_ROWS] = {0};
+
+    writePinLow(COL_SHIFT_IN_PIN);
+    matrix_wait_for_pin(COL_SHIFT_IN_PIN, 0);
+
+    // Setup the output column pin
+    shift_pulse_clock();
+
+    writePinHigh(COL_SHIFT_IN_PIN);
+    for (int current_col = 0; current_col < MATRIX_COLS; ++current_col) {
+
+        // Read the column ports
+        uint32_t gpio_a = palReadPort(GPIOA);
+        uint32_t gpio_b = palReadPort(GPIOB);
+        
+        // row 0, pin A8
+        int current_row = 0;
+        if ((gpio_a & (1 << 8)) >> 8) {
+            temp_matrix[current_row] &= ~(1ul << current_col);
+        } else {
+            temp_matrix[current_row] |= (1ul << current_col);
+        }
+        // row 1, pin A1
+        current_row = 1;
+        if ((gpio_a & (1 << 1)) >> 1) {
+            temp_matrix[current_row] &= ~(1ul << current_col);
+        } else {
+            temp_matrix[current_row] |= (1ul << current_col);
+        }
+        // row 2, pin A2
+        current_row = 2;
+        if ((gpio_a & (1 << 2)) >> 2) {
+            temp_matrix[current_row] &= ~(1ul << current_col);
+        } else {
+            temp_matrix[current_row] |= (1ul << current_col);
+        }
+        // row 3, pin B3
+        current_row = 3;
+        if ((gpio_b & (1 << 1)) >> 1) {
+            temp_matrix[current_row] &= ~(1ul << current_col);
+        } else {
+            temp_matrix[current_row] |= (1ul << current_col);
+        }
+        // row 4, pin A7
+        current_row = 4;
+        if ((gpio_a & (1 << 7)) >> 7) {
+            temp_matrix[current_row] &= ~(1ul << current_col);
+        } else {
+            temp_matrix[current_row] |= (1ul << current_col);
+        }
+        
+        // Setup the output column pin
+        shift_pulse_clock();
+    
+    }
+
+    // Check if matrix has changed, return the last-read data
+    bool changed = memcmp(current_matrix, temp_matrix, sizeof(temp_matrix)) != 0;
+    if (changed) {
+        memcpy(current_matrix, temp_matrix, sizeof(temp_matrix));
+    }
+    shift_pulse_clock();
+    return changed;
+}