From d9b5f5110ebf3e7da6a11e8640fb4367114aed67 Mon Sep 17 00:00:00 2001
From: Ralf Schmitt <ralf@bunkertor.net>
Date: Tue, 11 Nov 2014 14:49:16 +0100
Subject: Added NerD 60% support

---
 keyboard/nerd/matrix.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 keyboard/nerd/matrix.c

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

diff --git a/keyboard/nerd/matrix.c b/keyboard/nerd/matrix.c
new file mode 100644
index 000000000..f0ffe772d
--- /dev/null
+++ b/keyboard/nerd/matrix.c
@@ -0,0 +1,220 @@
+/*
+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"
+#include "backlight.h"
+
+
+#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 uint16_t read_inputs(void);
+static void init_inputs(void);
+static void init_outputs(void);
+static void reset_inputs(void);
+static void reset_outputs(void);
+static void select_output(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)
+{
+    backlight_init_ports();
+    init_inputs();
+    init_outputs();
+
+    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++) {
+        reset_inputs();
+        reset_outputs();
+        select_output(col);
+        _delay_us(3);
+        uint16_t rows = read_inputs();
+        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);
+                if (debouncing) {
+                    dprint("bounce!: "); dprintf("%02X", debouncing); dprintln();
+                }
+                debouncing = DEBOUNCE;
+            }
+        }
+    }
+
+    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++) {
+        phex(row); print(": ");
+        pbin_reverse16(matrix_get_row(row));
+        print("\n");
+    }
+}
+
+uint8_t matrix_key_count(void)
+{
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        count += bitpop16(matrix[i]);
+    }
+    return count;
+}
+
+static void init_inputs(void)
+{
+    DDRE &= ~0b01000000; // PE6 (Col 0)
+    DDRB &= ~0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
+    DDRF &= ~0b00000001; // PF0 (Col 5)
+    DDRD &= ~0b00100001; // PD0 (Col 6), PD5 (Col 7)
+}
+
+static uint16_t read_inputs(void)
+{
+    return (PINE&(1<<6) ? 0 : (1<<0)) |  // PE6 (Row 0)
+           (PINB&(1<<0) ? 0 : (1<<1)) |  // PB0 (Row 1)
+           (PINB&(1<<1) ? 0 : (1<<2)) |  // PB1 (Row 2)
+           (PINB&(1<<2) ? 0 : (1<<3)) |  // PB2 (Row 3)
+           (PINB&(1<<3) ? 0 : (1<<4)) |  // PB3 (Row 4)
+           (PINF&(1<<0) ? 0 : (1<<5)) |  // PF0 (Row 5)
+           (PIND&(1<<0) ? 0 : (1<<6)) |  // PD0 (Row 6)
+           (PIND&(1<<5) ? 0 : (1<<7));   // PD5 (Row 7)
+}
+
+static void reset_inputs(void)
+{
+    PORTE |= 0b01000000; // PE6 (Col 0)
+    PORTB |= 0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4)
+    PORTF |= 0b00000001; // PF0 (Col 5)
+    PORTD |= 0b00100001; // PD0 (Col 6), PD5 (Col 7)
+}
+
+static void init_outputs(void)
+{
+    DDRB |= 0b00010000; // PB4 (Row 0)
+    DDRE |= 0b00000100; // PE2 (Row 1)
+    DDRF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
+    DDRC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
+    DDRD |= 0b10000000; // PD7 (Row 8)
+}
+
+static void reset_outputs(void)
+{
+    PORTB |= 0b00010000; // PB4 (Row 0)
+    PORTE |= 0b00000100; // PE2 (Row 1)
+    PORTF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7)
+    PORTC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9)
+    PORTD |= 0b10000000; // PD7 (Row 8)
+}
+
+static void select_output(uint8_t col)
+{
+    switch (col) {
+        case 0:
+            PORTB &= ~(1<<4);
+            break;
+        case 1:
+            PORTE &= ~(1<<2);
+            break;
+        case 2:
+            PORTF &= ~(1<<4);
+            break;
+        case 3:
+            PORTF &= ~(1<<7);
+            break;
+        case 4:
+            PORTF &= ~(1<<1);
+            break;
+        case 5:
+            PORTF &= ~(1<<6);
+            break;
+        case 6:
+            PORTC &= ~(1<<6);
+            break;
+        case 7:
+            PORTF &= ~(1<<5);
+            break;
+        case 8:
+            PORTD &= ~(1<<7);
+            break;
+        case 9:
+            PORTC &= ~(1<<7);
+            break;
+    }
+}
-- 
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