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- /* Copyright 2012 Jun Wako <[email protected]>
- *
- * 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;
- static matrix_row_t *matrix_debounced;
- static matrix_row_t matrix0[MATRIX_ROWS];
- static matrix_row_t matrix1[MATRIX_ROWS];
-
-
- #define _DDRA (uint8_t *const)&DDRA
- #define _DDRB (uint8_t *const)&DDRB
- #define _DDRC (uint8_t *const)&DDRC
- #define _DDRD (uint8_t *const)&DDRD
- #define _DDRE (uint8_t *const)&DDRE
- #define _DDRF (uint8_t *const)&DDRF
-
- #define _PINA (uint8_t *const)&PINA
- #define _PINB (uint8_t *const)&PINB
- #define _PINC (uint8_t *const)&PINC
- #define _PIND (uint8_t *const)&PIND
- #define _PINE (uint8_t *const)&PINE
- #define _PINF (uint8_t *const)&PINF
-
- #define _PORTA (uint8_t *const)&PORTA
- #define _PORTB (uint8_t *const)&PORTB
- #define _PORTC (uint8_t *const)&PORTC
- #define _PORTD (uint8_t *const)&PORTD
- #define _PORTE (uint8_t *const)&PORTE
- #define _PORTF (uint8_t *const)&PORTF
-
- #define _BIT0 0x01
- #define _BIT1 0x02
- #define _BIT2 0x04
- #define _BIT3 0x08
- #define _BIT4 0x10
- #define _BIT5 0x20
- #define _BIT6 0x40
- #define _BIT7 0x80
-
- /* Specifies the ports and pin numbers for the rows */
- static
- uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB, _DDRB, _DDRB, _DDRB, _DDRB, _DDRB};
-
- static
- uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB};
-
- static
- uint8_t *const row_pin[MATRIX_ROWS] = {_PINB, _PINB, _PINB, _PINB, _PINB, _PINB};
-
- static
- const uint8_t row_bit[MATRIX_ROWS] = { _BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5};
-
- /* Specifies the ports and pin numbers for the columns */
- static
- uint8_t *const col_ddr[MATRIX_COLS] = { _DDRD, _DDRC, _DDRC, _DDRD, _DDRD, _DDRE,
- _DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF,
- _DDRD, _DDRD, _DDRD, _DDRD, _DDRD};
-
- static
- uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE,
- _PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF,
- _PORTD, _PORTD, _PORTD, _PORTD, _PORTD};
-
- static
- const uint8_t col_bit[MATRIX_COLS] = { _BIT5, _BIT7, _BIT6, _BIT4, _BIT0, _BIT6,
- _BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7,
- _BIT7, _BIT6, _BIT1, _BIT2, _BIT3};
-
- static
- inline void pull_column(int col) {
- *col_port[col] &= ~col_bit[col];
- }
-
- static
- inline void release_column(int col) {
- *col_port[col] |= col_bit[col];
- }
-
- /* PORTB is set as input with pull-up resistors
- PORTC,D,E,F are set to high output */
-
- static
- void setup_io_pins(void) {
- uint8_t row, col;
- for(row = 0; row < MATRIX_ROWS; row++) {
- *row_ddr[row] &= ~row_bit[row];
- *row_port[row] |= row_bit[row];
- }
- for(col = 0; col < MATRIX_COLS; col++) {
- *col_ddr[col] |= col_bit[col];
- *col_port[col] |= col_bit[col];
- }
- }
-
- /* 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 = 250; // Output compare register 1B
- OCR1C = 250; // Output compare register 1C
- // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
- DDRB &= 0x3F;
- PORTB &= 0x3F;
- }
-
-
- 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
- setup_io_pins();
- setup_leds();
-
- // initialize matrix state: all keys off
- for (uint8_t i=0; i < MATRIX_ROWS; i++) {
- matrix0[i] = 0;
- matrix1[i] = 0;
- }
- matrix = matrix0;
- matrix_debounced = matrix1;
- }
-
- uint8_t matrix_scan(void)
- {
- for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16
- pull_column(col); // output hi on theline
- _delay_us(3); // without this wait it won't read stable value.
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
- bool prev_bit = matrix[row] & ((matrix_row_t)1<<col);
- bool curr_bit = !(*row_pin[row] & row_bit[row]);
- if (prev_bit != curr_bit) {
- matrix[row] ^= ((matrix_row_t)1<<col);
- if (debouncing) {
- debug("bounce!: "); debug_hex(debouncing); print("\n");
- }
- debouncing = DEBOUNCE;
- }
- }
- release_column(col);
- }
-
- if (debouncing) {
- if (--debouncing) {
- _delay_ms(1);
- } else {
- matrix_row_t *tmp = matrix_debounced;
- matrix_debounced = matrix;
- matrix = tmp;
- }
- }
-
- return 1;
- }
-
- bool matrix_is_modified(void)
- {
- // NOTE: no longer used
- return true;
- }
-
- inline
- bool matrix_is_on(uint8_t row, uint8_t col)
- {
- return (matrix_debounced[row] & ((matrix_row_t)1<<col));
- }
-
- inline
- matrix_row_t matrix_get_row(uint8_t row)
- {
- return matrix_debounced[row];
- }
-
- void matrix_print(void)
- {
- print("\nr/c 01234567\n");
- for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
- phex(row); print(": ");
- pbin_reverse(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++) {
- for (uint8_t j = 0; j < MATRIX_COLS; j++) {
- if (matrix_is_on(i, j))
- count++;
- }
- }
- return count;
- }
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