From 19fd20261b895a6848c8b15fd7365d5b87b7fd72 Mon Sep 17 00:00:00 2001
From: Gabriel Young <gabeplaysdrums@live.com>
Date: Sat, 18 Mar 2017 16:19:10 -0700
Subject: sketch out frosty flake matrix using custom matrix.c based on kitten
 paw

---
 keyboards/frosty_flake/matrix.c | 167 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 keyboards/frosty_flake/matrix.c

(limited to 'keyboards/frosty_flake/matrix.c')

diff --git a/keyboards/frosty_flake/matrix.c b/keyboards/frosty_flake/matrix.c
new file mode 100644
index 0000000000..21b0d90885
--- /dev/null
+++ b/keyboards/frosty_flake/matrix.c
@@ -0,0 +1,167 @@
+//TODO(gabe): customize for frosty flake
+
+/*
+  Copyright 2014 Ralf Schmitt <ralf@bunkertor.net>
+
+  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 uint8_t read_rows(void);
+static void select_col(uint8_t col);
+
+inline uint8_t matrix_rows(void) {
+  return MATRIX_ROWS;
+}
+
+inline uint8_t matrix_cols(void) {
+  return MATRIX_COLS;
+}
+
+/* Column pin configuration
+ *
+ * col: 0    1    2    3    4    5    6    7
+ * pin: PC7  PD5  PD3  PD1  PC2  PD6  PD4  PD2
+ *
+ * Rrr pin configuration 
+ *
+ * These rrrs uses one 74HC154 4 to 16 bit demultiplexer (low
+ * active), together with 2 rrrs driven directly from the micro
+ * controller, to control the 18 rrrs. The rrrs are driven from
+ * pins B6,5,4,3,2,1,0.
+ */
+void matrix_init(void) {
+  DDRC  &= ~0b10000100;  // Row input pins
+  DDRD  &= ~0b01111110;
+  PORTC |=  0b10000100;
+  PORTD |=  0b01111110;
+
+  DDRB  |=  0b01111111;  // Column output pins
+
+  for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
+    matrix[i] = 0;
+    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);
+    uint8_t rows = read_rows();
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+      bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
+      bool curr_bit = rows & (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;
+}
+
+bool matrix_is_modified(void) {
+  if (debouncing)
+    return false;
+  else
+    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];
+}
+
+void matrix_print(void) {
+  print("\nr/c 0123456789ABCDEF\n");
+  for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+    xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row)));
+  }
+}
+
+uint8_t matrix_key_count(void) {
+  uint8_t count = 0;
+  for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+    count += bitpop32(matrix[i]);
+  }
+  return count;
+}
+
+static uint8_t read_rows(void) {
+  return
+    (PINC&(1<<7) ? 0 : (1<<0)) |
+    (PIND&(1<<5) ? 0 : (1<<1)) |
+    (PIND&(1<<3) ? 0 : (1<<2)) |
+    (PIND&(1<<1) ? 0 : (1<<3)) |
+    (PINC&(1<<2) ? 0 : (1<<4)) |
+    (PIND&(1<<2) ? 0 : (1<<5)) |
+    (PIND&(1<<4) ? 0 : (1<<6)) |
+    (PIND&(1<<6) ? 0 : (1<<7));
+}
+
+static void select_col(uint8_t col) {
+  switch (col) {
+  case  0: PORTB = (PORTB & ~0b01111111) | 0b01100100; break;
+  case  1: PORTB = (PORTB & ~0b01111111) | 0b01101100; break;
+  case  2: PORTB = (PORTB & ~0b01111111) | 0b01100010; break;
+  case  3: PORTB = (PORTB & ~0b01111111) | 0b01111010; break;
+  case  4: PORTB = (PORTB & ~0b01111111) | 0b01100110; break;
+  case  5: PORTB = (PORTB & ~0b01111111) | 0b01110110; break;
+  case  6: PORTB = (PORTB & ~0b01111111) | 0b01101110; break;
+  case  7: PORTB = (PORTB & ~0b01111111) | 0b01111110; break;
+  case  8: PORTB = (PORTB & ~0b01111111) | 0b01000001; break;
+  case  9: PORTB = (PORTB & ~0b01111111) | 0b00100001; break;
+  case 10: PORTB = (PORTB & ~0b01111111) | 0b01101010; break;
+  case 11: PORTB = (PORTB & ~0b01111111) | 0b01110010; break;
+  case 12: PORTB = (PORTB & ~0b01111111) | 0b01111100; break;
+  case 13: PORTB = (PORTB & ~0b01111111) | 0b01110100; break;
+  case 14: PORTB = (PORTB & ~0b01111111) | 0b01111000; break;
+  case 15: PORTB = (PORTB & ~0b01111111) | 0b01110000; break;
+  case 16: PORTB = (PORTB & ~0b01111111) | 0b01100000; break;
+  case 17: PORTB = (PORTB & ~0b01111111) | 0b01101000; break;
+  }
+}
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