From a6d33e2c98b16fdd3c7eaccb9e8c941d4315d528 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vlastimil=20Ov=C4=8D=C3=A1=C4=8D=C3=ADk?=
 <vovcacik@github.ovcacik.org>
Date: Sun, 28 Dec 2014 09:49:57 +0100
Subject: Added support for The Ghost Squid controller used for CM XT keyboard.

- initial commit
- created as clone of the kitten_paw subproject with pins adjusted for CM
  XT
---
 keyboard/ghost_squid/matrix.c | 237 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 237 insertions(+)
 create mode 100644 keyboard/ghost_squid/matrix.c

(limited to 'keyboard/ghost_squid/matrix.c')

diff --git a/keyboard/ghost_squid/matrix.c b/keyboard/ghost_squid/matrix.c
new file mode 100644
index 0000000000..d6a82ef759
--- /dev/null
+++ b/keyboard/ghost_squid/matrix.c
@@ -0,0 +1,237 @@
+/*
+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 DEBOUNCE
+#   define DEBOUNCE 0
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static uint8_t read_rows(void);
+static void init_rows(void);
+static void unselect_cols(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;
+}
+
+void matrix_init(void)
+{
+    unselect_cols();
+    init_rows();
+    for (uint8_t i=0; i < MATRIX_ROWS; i++)  {
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
+    }
+}
+
+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 = DEBOUNCE;
+            }
+        }
+        unselect_cols();
+    }
+
+    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];
+}
+
+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;
+}
+
+/* Row pin configuration
+ *
+ * row: 0    1    2    3    4    5    6    7
+ * pin: PB1  PC2  PB6  PB4  PB3  PB5  PB0  PB2
+ *
+ */
+static void init_rows(void)
+{
+    DDRC &= ~0b00000100;
+    DDRB &= ~0b01111111;
+    PORTC |= 0b00000100;
+    PORTB |= 0b01111111;
+}
+
+static uint8_t read_rows(void)
+{
+    return (PINB&(1<<1) ? 0 : (1<<0)) |
+           (PINC&(1<<2) ? 0 : (1<<1)) |
+           (PINB&(1<<6) ? 0 : (1<<2)) |
+           (PINB&(1<<4) ? 0 : (1<<3)) |
+           (PINB&(1<<3) ? 0 : (1<<4)) |
+           (PINB&(1<<5) ? 0 : (1<<5)) |
+           (PINB&(1<<0) ? 0 : (1<<6)) |
+           (PINB&(1<<2) ? 0 : (1<<7));
+}
+
+/*  These columns uses two 74HC42 4 to 10 bit demultiplexers (low active).
+ *
+ *   COL PD6 PD5 PD4 PD3 PD2 PD1
+ *   10   1   1   0   0   0   0
+ *   15   1   1   0   0   0   1
+ *    8   1   1   0   0   1   0
+ *   14   1   1   0   1   0   0
+ *    6   1   1   0   1   0   1
+ *   13   1   1   0   1   1   0
+ *   12   1   1   1   0   0   0
+ *    9   1   1   1   0   1   0
+ *   11   1   1   1   1   0   0
+ *    7   1   1   1   1   1   0
+ *
+ *   COL PD1 PD2 PD3 PD4 PD5 PD6
+ *    3   1   1   0   0   0   1
+ *    4   1   1   0   0   1   0
+ *   17   1   1   0   1   0   0
+ *   16   1   1   0   1   1   0
+ *    0   1   1   1   0   0   1
+ *    5   1   1   1   0   1   0
+ *    2   1   1   1   1   0   0
+ *    1   1   1   1   1   1   0
+ */
+static void unselect_cols(void)
+{
+    DDRD |= 0b01111111;
+    PORTD &= ~0b01111111;
+}
+
+static void select_col(uint8_t col)
+{
+    switch (col) {
+        case 0:
+            PORTD |= (1<<6) | (1<<3) | (1<<2) | (1<<1);
+            break;
+        case 1:
+            PORTD |= (1<<5) | (1<<4) | (1<<3) | (1<<2) | (1<<1);
+            break;
+        case 2:
+            PORTD |= (1<<4) | (1<<3) | (1<<2) | (1<<1);
+            break;
+        case 3:
+            PORTD |= (1<<6) | (1<<2) | (1<<1);
+            break;
+        case 4:
+            PORTD |= (1<<5) | (1<<2) | (1<<1);
+            break;
+        case 5:
+            PORTD |= (1<<5) | (1<<3) | (1<<2) | (1<<1);
+            break;
+        case 6:
+            PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<1);
+            break;
+        case 7:
+            PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3) | (1<<2);
+            break;
+        case 8:
+            PORTD |= (1<<6) | (1<<5) | (1<<2);
+            break;
+        case 9:
+            PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<2);
+            break;
+        case 10:
+            PORTD |= (1<<6) | (1<<5);
+            break;
+        case 11:
+            PORTD |= (1<<6) | (1<<5) | (1<<4) | (1<<3);
+            break;
+        case 12:
+            PORTD |= (1<<6) | (1<<5) | (1<<4);
+            break;
+        case 13:
+            PORTD |= (1<<6) | (1<<5) | (1<<3) | (1<<2);
+            break;
+        case 14:
+            PORTD |= (1<<6) | (1<<5) | (1<<3);
+            break;
+        case 15:
+            PORTD |= (1<<6) | (1<<5) | (1<<1);
+            break;
+        case 16:
+            PORTD |= (1<<5) | (1<<4) | (1<<2) | (1<<1);
+            break;
+        case 17:
+            PORTD |= (1<<4) | (1<<2) | (1<<1);
+            break;
+    }
+}
-- 
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