1 files changed, 135 insertions, 0 deletions

diff --git a/keyboards/frosty_flake/matrix.c b/keyboards/frosty_flake/matrix.c
new file mode 100644
index 000000000..05dffdb64
--- /dev/null
+++ b/keyboards/frosty_flake/matrix.c
@@ -0,0 +1,135 @@
+/*
+  Copyright 2017 Gabriel Young <gabeplaysdrums@live.com>
+
+  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 <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+
+#ifndef DEBOUNCING_DELAY
+#   define DEBOUNCING_DELAY 5
+#endif
+static uint8_t debouncing = DEBOUNCING_DELAY;
+
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static matrix_row_t scan_col(void) {
+    return (
+        (PINC&(1<<7) ? 0 : ((matrix_row_t)1<<0)) |
+        (PINB&(1<<5) ? 0 : ((matrix_row_t)1<<1)) |
+        (PINB&(1<<4) ? 0 : ((matrix_row_t)1<<2)) |
+        (PINB&(1<<6) ? 0 : ((matrix_row_t)1<<3)) |
+        (PINB&(1<<1) ? 0 : ((matrix_row_t)1<<4)) |
+        (PINB&(1<<2) ? 0 : ((matrix_row_t)1<<5)) |
+        (PINB&(1<<3) ? 0 : ((matrix_row_t)1<<6)) |
+        (PINB&(1<<0) ? 0 : ((matrix_row_t)1<<7))
+    );
+}
+
+static void select_col(uint8_t col) {
+    switch (col) {
+        case  0: PORTD = (PORTD & ~0b01111011) | 0b00011011; break;
+        case  1: PORTD = (PORTD & ~0b01111011) | 0b01000011; break;
+        case  2: PORTD = (PORTD & ~0b01111011) | 0b01101010; break;
+        case  3: PORTD = (PORTD & ~0b01111011) | 0b01111001; break;
+        case  4: PORTD = (PORTD & ~0b01111011) | 0b01100010; break;
+        case  5: PORTD = (PORTD & ~0b01111011) | 0b01110001; break;
+        case  6: PORTD = (PORTD & ~0b01111011) | 0b01100001; break;
+        case  7: PORTD = (PORTD & ~0b01111011) | 0b01110000; break;
+        case  8: PORTD = (PORTD & ~0b01111011) | 0b01100000; break;
+        case  9: PORTD = (PORTD & ~0b01111011) | 0b01101000; break;
+        case 10: PORTD = (PORTD & ~0b01111011) | 0b00101011; break;
+        case 11: PORTD = (PORTD & ~0b01111011) | 0b00110011; break;
+        case 12: PORTD = (PORTD & ~0b01111011) | 0b00100011; break;
+        case 13: PORTD = (PORTD & ~0b01111011) | 0b01111000; break;
+        case 14: PORTD = (PORTD & ~0b01111011) | 0b00010011; break;
+        case 15: PORTD = (PORTD & ~0b01111011) | 0b01101001; break;
+        case 16: PORTD = (PORTD & ~0b01111011) | 0b00001011; break;
+        case 17: PORTD = (PORTD & ~0b01111011) | 0b00111011; break;
+    }
+}
+
+void matrix_init(void) {
+    /* Row output pins */
+    DDRD  |=  0b01111011;
+    /* Column input pins */
+    DDRC  &= ~0b10000000;
+    DDRB  &= ~0b01111111;
+    PORTC |=  0b10000000;
+    PORTB |=  0b01111111;
+
+    for (uint8_t i=0; i < MATRIX_ROWS; i++)
+        matrix[i] = matrix_debouncing[i] = 0;
+
+    matrix_init_quantum();
+}
+
+uint8_t matrix_scan(void) {
+    for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+        select_col(col);
+        _delay_us(3);
+        matrix_row_t col_scan = scan_col();
+        for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+            bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
+            bool curr_bit = col_scan & (1<<row);
+            if (prev_bit != curr_bit) {
+                matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
+                debouncing = DEBOUNCING_DELAY;
+            }
+        }
+    }
+
+    if (debouncing) {
+        if (--debouncing)
+            _delay_ms(1);
+        else
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++)
+                matrix[i] = matrix_debouncing[i];
+    }
+
+    matrix_scan_quantum();
+    return 1;
+}
+
+inline matrix_row_t matrix_get_row(uint8_t row) {
+    return matrix[row];
+}
+
+void matrix_print(void) {
+    print("\nr\\c ABCDEFGHIJKLMNOPQR\n");
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        matrix_row_t matrix_row = matrix_get_row(row);
+        xprintf("%02X: ", row);
+        for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+            bool curr_bit = matrix_row & (1<<col);
+            xprintf("%c", curr_bit ? '*' : '.');
+        }
+        print("\n");
+    }
+}
+
+uint8_t matrix_key_count(void) {
+    uint8_t count = 0;
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++)
+        count += bitpop32(matrix[row]);
+    return count;
+}
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