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-rw-r--r--keyboard/phantom/matrix.c274
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diff --git a/keyboard/phantom/matrix.c b/keyboard/phantom/matrix.c
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+/* Copyright 2012 Jun Wako <wakojun@gmail.com>
+ *
+ * This is heavily based on phantom/board.{c|h}.
+ * https://github.com/BathroomEpiphanies/AVR-Keyboard
+ *
+ * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
+ * http://bathroomepiphanies.com
+ *
+ * As for liscensing consult with the original files or its author.
+ */
+#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;
+
+// bit array of key 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 void init_rows(void);
+static void unselect_cols(void);
+static void select_col(uint8_t col);
+
+#ifndef SLEEP_LED_ENABLE
+/* LEDs are on output compare pins OC1B OC1C
+ This activates fast PWM mode on them.
+ Prescaler 256 and 8-bit counter results in
+ 16000000/256/256 = 244 Hz blink frequency.
+ LED_A: Caps Lock
+ LED_B: Scroll Lock */
+/* Output on PWM pins are turned off when the timer
+ reaches the value in the output compare register,
+ and are turned on when it reaches TOP (=256). */
+static
+void setup_leds(void)
+{
+ TCCR1A |= // Timer control register 1A
+ (1<<WGM10) | // Fast PWM 8-bit
+ (1<<COM1B1)| // Clear OC1B on match, set at TOP
+ (1<<COM1C1); // Clear OC1C on match, set at TOP
+ TCCR1B |= // Timer control register 1B
+ (1<<WGM12) | // Fast PWM 8-bit
+ (1<<CS12); // Prescaler 256
+ OCR1B = LED_BRIGHTNESS; // Output compare register 1B
+ OCR1C = LED_BRIGHTNESS; // Output compare register 1C
+ // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
+ DDRB |= (1<<6) | (1<<7);
+ PORTB &= ~((1<<6) | (1<<7));
+}
+#endif
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+ // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
+ MCUCR |= (1<<JTD);
+ MCUCR |= (1<<JTD);
+
+ // initialize row and col
+ unselect_cols();
+ init_rows();
+#ifndef SLEEP_LED_ENABLE
+ setup_leds();
+#endif
+
+ // 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++) { // 0-16
+ select_col(col);
+ _delay_us(3); // without this wait it won't read stable value.
+ uint8_t rows = read_rows();
+ 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: B5 B4 B3 B2 B1 B0
+ */
+static void init_rows(void)
+{
+ // Input with pull-up(DDR:0, PORT:1)
+ DDRB &= ~0b00111111;
+ PORTB |= 0b00111111;
+}
+
+static uint8_t read_rows(void)
+{
+ return (PINB&(1<<5) ? 0 : (1<<0)) |
+ (PINB&(1<<4) ? 0 : (1<<1)) |
+ (PINB&(1<<3) ? 0 : (1<<2)) |
+ (PINB&(1<<2) ? 0 : (1<<3)) |
+ (PINB&(1<<1) ? 0 : (1<<4)) |
+ (PINB&(1<<0) ? 0 : (1<<5));
+}
+
+/* Column pin configuration
+ * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
+ * pin: D5 C7 C6 D4 D0 E6 F0 F1 F4 F5 F6 F7 D7 D6 D1 D2 D3
+ */
+static void unselect_cols(void)
+{
+ // Hi-Z(DDR:0, PORT:0) to unselect
+ DDRC |= 0b11000000; // PC: 7 6
+ PORTC |= 0b11000000;
+ DDRD |= 0b11111111; // PD: 7 6 5 4 3 2 1 0
+ PORTD |= 0b11111111;
+ DDRE |= 0b01000000; // PE: 6
+ PORTE |= 0b01000000;
+ DDRF |= 0b11110011; // PF: 7 6 5 4 1 0
+ PORTF |= 0b11110011;
+}
+
+static void select_col(uint8_t col)
+{
+ // Output low(DDR:1, PORT:0) to select
+ switch (col) {
+ case 0:
+ DDRD |= (1<<5);
+ PORTD &= ~(1<<5);
+ break;
+ case 1:
+ DDRC |= (1<<7);
+ PORTC &= ~(1<<7);
+ break;
+ case 2:
+ DDRC |= (1<<6);
+ PORTC &= ~(1<<6);
+ break;
+ case 3:
+ DDRD |= (1<<4);
+ PORTD &= ~(1<<4);
+ break;
+ case 4:
+ DDRD |= (1<<0);
+ PORTD &= ~(1<<0);
+ break;
+ case 5:
+ DDRE |= (1<<6);
+ PORTE &= ~(1<<6);
+ break;
+ case 6:
+ DDRF |= (1<<0);
+ PORTF &= ~(1<<0);
+ break;
+ case 7:
+ DDRF |= (1<<1);
+ PORTF &= ~(1<<1);
+ break;
+ case 8:
+ DDRF |= (1<<4);
+ PORTF &= ~(1<<4);
+ break;
+ case 9:
+ DDRF |= (1<<5);
+ PORTF &= ~(1<<5);
+ break;
+ case 10:
+ DDRF |= (1<<6);
+ PORTF &= ~(1<<6);
+ break;
+ case 11:
+ DDRF |= (1<<7);
+ PORTF &= ~(1<<7);
+ break;
+ case 12:
+ DDRD |= (1<<7);
+ PORTD &= ~(1<<7);
+ break;
+ case 13:
+ DDRD |= (1<<6);
+ PORTD &= ~(1<<6);
+ break;
+ case 14:
+ DDRD |= (1<<1);
+ PORTD &= ~(1<<1);
+ break;
+ case 15:
+ DDRD |= (1<<2);
+ PORTD &= ~(1<<2);
+ break;
+ case 16:
+ DDRD |= (1<<3);
+ PORTD &= ~(1<<3);
+ break;
+ }
+}