From 5ca3bde10aa5d8057895475840800544599ea33f Mon Sep 17 00:00:00 2001
From: Ralf Schmitt <ralf@bunkertor.net>
Date: Tue, 18 Mar 2014 20:06:24 +0100
Subject: Support for Lightsaber keyboard

---
 keyboard/lightsaber/matrix.c | 292 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 292 insertions(+)
 create mode 100644 keyboard/lightsaber/matrix.c

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

diff --git a/keyboard/lightsaber/matrix.c b/keyboard/lightsaber/matrix.c
new file mode 100644
index 000000000..e3eca84df
--- /dev/null
+++ b/keyboard/lightsaber/matrix.c
@@ -0,0 +1,292 @@
+/*
+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;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static uint8_t read_rows(void);
+static uint8_t read_fwkey(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();
+    // 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 col = 0; col < MATRIX_COLS; col++) {  // 0-17
+        select_col(col);
+        _delay_us(3); // TODO: Determine the correct value needed here.
+        uint8_t rows = read_rows();
+        // Use the otherwise unused col: 12 row: 3 for firmware.
+        if(col == 12) {
+            rows |= read_fwkey();
+        }
+        for (uint8_t row = 0; row < MATRIX_ROWS; row++) {  // 0-5
+            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);
+                if (debouncing) {
+                    dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
+                }
+                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
+ * pin: PD0  PD1  PD2  PD3  PD5  PB7
+ *
+ * Firmware uses its own pin PE2
+ */
+static void init_rows(void)
+{
+    // Input (DDR:0, PORT:0)
+    DDRD  &= ~0b00101111;
+    PORTD &= ~0b00101111;
+    DDRB  &= ~(1<<7);
+    PORTB &= ~(1<<7);
+
+    // Input with pull-up (DDR:0, PORT:1)
+    DDRE &= ~(1<<2);
+    PORTE |= (1<<2);
+}
+
+static uint8_t read_rows(void)
+{
+    return (PIND&(1<<0) ? (1<<0) : 0) |
+           (PIND&(1<<1) ? (1<<1) : 0) |
+           (PIND&(1<<2) ? (1<<2) : 0) |
+           (PIND&(1<<3) ? (1<<3) : 0) |
+           (PIND&(1<<5) ? (1<<4) : 0) |
+           (PINB&(1<<7) ? (1<<5) : 0);
+}
+
+static uint8_t read_fwkey(void)
+{
+    return PINE&(1<<2) ? 0 : (1<<3);
+}
+
+/* Columns 0 - 15
+ * These columns uses two 74HC237D 3 to 8 bit demultiplexers.
+ * col / pin:    PC6  PB6  PF0  PF1  PC7
+ * 0:             1    0    0    0    0
+ * 1:             1    0    1    0    0
+ * 2:             1    0    0    1    0
+ * 3:             1    0    1    1    0
+ * 4:             1    0    0    0    1
+ * 5:             1    0    1    0    1
+ * 6:             1    0    0    1    1
+ * 7:             1    0    1    1    1
+ * 8:             0    1    0    0    0
+ * 9:             0    1    1    0    0
+ * 10:            0    1    0    1    0
+ * 11:            0    1    1    1    0
+ * 12:            0    1    0    0    1
+ * 13:            0    1    1    0    1
+ * 14:            0    1    0    1    1
+ * 15:            0    1    1    1    1
+ *
+ * col: 16
+ * pin: PB5
+ *
+ * col: 17
+ * pin: PD4
+ */
+static void unselect_cols(void)
+{
+    DDRB |= (1<<5) | (1<<6);
+    PORTB &= ~((1<<5) | (1<<6));
+
+    DDRC |= (1<<6) | (1<<7);
+    PORTC &= ~((1<<6) | (1<<7));
+
+    DDRD |= (1<<4);
+    PORTD &= ~(1<<4);
+
+    DDRF |= (1<<0) | (1<<1);
+    PORTF &= ~((1<<0) | (1<<1));
+}
+
+static void select_col(uint8_t col)
+{
+    // Output high (DDR:1, PORT:1) to select
+    switch (col) {
+        case 0:
+            PORTC |= (1<<6);
+            break;
+        case 1:
+            PORTC |= (1<<6);
+            PORTF |= (1<<0);
+            break;
+        case 2:
+            PORTC |= (1<<6);
+            PORTF |= (1<<1);
+            break;
+        case 3:
+            PORTC |= (1<<6);
+            PORTF |= (1<<0) | (1<<1);
+            break;
+        case 4:
+            PORTC |= (1<<6);
+            PORTC |= (1<<7);
+            break;
+        case 5:
+            PORTC |= (1<<6);
+            PORTF |= (1<<0);
+            PORTC |= (1<<7);
+            break;
+        case 6:
+            PORTC |= (1<<6);
+            PORTF |= (1<<1);
+            PORTC |= (1<<7);
+            break;
+        case 7:
+            PORTC |= (1<<6);
+            PORTF |= (1<<0) | (1<<1);
+            PORTC |= (1<<7);
+            break;
+        case 8:
+            PORTB |= (1<<6);
+            break;
+        case 9:
+            PORTB |= (1<<6);
+            PORTF |= (1<<0);
+            break;
+        case 10:
+            PORTB |= (1<<6);
+            PORTF |= (1<<1);
+            break;
+        case 11:
+            PORTB |= (1<<6);
+            PORTF |= (1<<0) | (1<<1);
+            break;
+        case 12:
+            PORTB |= (1<<6);
+            PORTC |= (1<<7);
+            break;
+        case 13:
+            PORTB |= (1<<6);
+            PORTF |= (1<<0);
+            PORTC |= (1<<7);
+            break;
+        case 14:
+            PORTB |= (1<<6);
+            PORTF |= (1<<1);
+            PORTC |= (1<<7);
+            break;
+        case 15:
+            PORTB |= (1<<6);
+            PORTF |= (1<<0) | (1<<1);
+            PORTC |= (1<<7);
+            break;
+        case 16:
+            PORTB |= (1<<5);
+            break;
+        case 17:
+            PORTD |= (1<<4);
+            break;
+    }
+}
-- 
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