i2c working

keyboards/lets_split/uno-slave/uno-matrix.c

@@ -0,0 +1,160 @@
+#define F_CPU 16000000UL
+
+#include <util/delay.h>
+#include <avr/io.h>
+#include <stdlib.h>
+
+#include "uno-matrix.h"
+
+#define debug(X) NULL
+#define debug_hex(X) NULL
+
+#ifndef DEBOUNCE
+#   define DEBOUNCE  5
+#endif
+
+static uint8_t debouncing = DEBOUNCE;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static matrix_row_t read_cols(void);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+    //debug_enable = true;
+    //debug_matrix = true;
+    //debug_mouse = true;
+    // initialize row and col
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
+    }
+}
+
+uint8_t matrix_scan(void)
+{
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        select_row(i);
+        _delay_us(30);  // without this wait read unstable value.
+        matrix_row_t cols = read_cols();
+        //Serial.println(cols, BIN);
+        if (matrix_debouncing[i] != cols) {
+            matrix_debouncing[i] = cols;
+            if (debouncing) {
+                debug("bounce!: "); debug_hex(debouncing); debug("\n");
+            }
+            debouncing = DEBOUNCE;
+        }
+        unselect_rows();
+    }
+
+    if (debouncing) {
+        if (--debouncing) {
+            _delay_ms(1);
+        } else {
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
+        }
+    }
+
+    return 1;
+}
+
+bool matrix_is_modified(void)
+{
+    if (debouncing) return false;
+    return true;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+// TODO update this comment
+/* Column pin configuration
+ * col: 0   1   2   3   4   5
+ * pin: D3  D4  D5  D6  D7  B0
+ */
+static void  init_cols(void)
+{
+    // Input with pull-up(DDR:0, PORT:1)
+  DDRD  &= ~(1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
+  PORTD |=  (1<<3 | 1<<4 | 1<<5 | 1<<6 | 1<<7);
+
+  DDRB  &= ~(1<<0);
+  PORTB |=  (1<<0);
+}
+
+static matrix_row_t read_cols(void)
+{
+    return (PIND&(1<<3) ? 0 : (1<<0)) |
+           (PIND&(1<<4) ? 0 : (1<<1)) |
+           (PIND&(1<<5) ? 0 : (1<<2)) |
+           (PIND&(1<<6) ? 0 : (1<<3)) |
+           (PIND&(1<<7) ? 0 : (1<<4)) |
+           (PINB&(1<<0) ? 0 : (1<<5));
+}
+
+/* Row pin configuration
+ * row: 0  1  2  3
+ * pin: C0 C1 C2 C3
+ */
+static void unselect_rows(void)
+{
+    // Hi-Z(DDR:0, PORT:0) to unselect
+    DDRC  &= ~0xF;
+    PORTC &= ~0xF;
+}
+
+static void select_row(uint8_t row)
+{
+    // Output low(DDR:1, PORT:0) to select
+    switch (row) {
+        case 0:
+            DDRC  |= (1<<0);
+            PORTC &= ~(1<<0);
+            break;
+        case 1:
+            DDRC  |= (1<<1);
+            PORTC &= ~(1<<1);
+            break;
+        case 2:
+            DDRC  |= (1<<2);
+            PORTC &= ~(1<<2);
+            break;
+        case 3:
+            DDRC  |= (1<<3);
+            PORTC &= ~(1<<3);
+            break;
+    }
+}