infinity: Add initial files for keyboard support

keyboard/infinity/matrix.c

@@ -0,0 +1,107 @@
+#include <stdint.h>
+#include <stdbool.h>
+#include "gpio_api.h"
+#include "timer.h"
+#include "wait.h"
+#include "matrix.h"
+
+
+#ifndef DEBOUNCE
+#define DEBOUNCE    5
+#endif
+
+/*
+ * Infinity Pinusage:
+ * Column pins are input with internal pull-down. Row pins are output and strobe with high.
+ * Key is high or 1 when it turns on.
+ *
+ *     col: { PTD1, PTD2, PTD3, PTD4, PTD5, PTD6, PTD7 }
+ *     row: { PTB0, PTB1, PTB2, PTB3, PTB16, PTB17, PTC4, PTC5, PTD0 }
+ */
+static gpio_t col[MATRIX_COLS];
+static gpio_t row[MATRIX_ROWS];
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+static bool debouncing = false;
+static uint16_t debouncing_time = 0;
+
+
+void matrix_init(void)
+{
+    /* Column(sense) */
+    gpio_init_in_ex(&col[0], PTD1, PullDown);
+    gpio_init_in_ex(&col[1], PTD2, PullDown);
+    gpio_init_in_ex(&col[2], PTD3, PullDown);
+    gpio_init_in_ex(&col[3], PTD4, PullDown);
+    gpio_init_in_ex(&col[4], PTD5, PullDown);
+    gpio_init_in_ex(&col[5], PTD6, PullDown);
+    gpio_init_in_ex(&col[6], PTD7, PullDown);
+
+    /* Row(strobe) */
+    gpio_init_out_ex(&row[0], PTB0, 0);
+    gpio_init_out_ex(&row[1], PTB1, 0);
+    gpio_init_out_ex(&row[2], PTB2, 0);
+    gpio_init_out_ex(&row[3], PTB3, 0);
+    gpio_init_out_ex(&row[4], PTB16, 0);
+    gpio_init_out_ex(&row[5], PTB17, 0);
+    gpio_init_out_ex(&row[6], PTC4, 0);
+    gpio_init_out_ex(&row[7], PTC5, 0);
+    gpio_init_out_ex(&row[8], PTD0, 0);
+}
+
+uint8_t matrix_scan(void)
+{
+    for (int i = 0; i < MATRIX_ROWS; i++) {
+        matrix_row_t r = 0;
+
+        gpio_write(&row[i], 1);
+        wait_us(1); // need wait to settle pin state
+        for (int j = 0; j < MATRIX_COLS; j++) {
+            if (gpio_read(&col[j])) {
+                r |= (1<<j);
+            }
+        }
+        gpio_write(&row[i], 0);
+
+        if (matrix_debouncing[i] != r) {
+            matrix_debouncing[i] = r;
+            debouncing = true;
+            debouncing_time = timer_read();
+        }
+    }
+
+    if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
+        for (int i = 0; i < MATRIX_ROWS; i++) {
+            matrix[i] = matrix_debouncing[i];
+        }
+        debouncing = false;
+    }
+/*
+    if (debouncing) {
+        if (--debouncing) {
+            return 0;
+        } else {
+            for (int i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
+        }
+    }
+*/
+    return 1;
+}
+
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & (1<<col));
+}
+
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+}