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242 lines
6.1 KiB
C
242 lines
6.1 KiB
C
/* Copyright 2012 Jun Wako <wakojun@gmail.com>
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*
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* This is heavily based on phantom/board.{c|h}.
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* https://github.com/BathroomEpiphanies/AVR-Keyboard
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*
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* Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
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* http://bathroomepiphanies.com
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*
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* As for liscensing consult with the original files or its author.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 0
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#endif
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static uint8_t debouncing = DEBOUNCE;
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// bit array of key state(1:on, 0:off)
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static matrix_row_t matrix[MATRIX_ROWS];
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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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#define _DDRA (uint8_t *const)&DDRA
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#define _DDRB (uint8_t *const)&DDRB
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#define _DDRC (uint8_t *const)&DDRC
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#define _DDRD (uint8_t *const)&DDRD
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#define _DDRE (uint8_t *const)&DDRE
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#define _DDRF (uint8_t *const)&DDRF
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#define _PINA (uint8_t *const)&PINA
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#define _PINB (uint8_t *const)&PINB
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#define _PINC (uint8_t *const)&PINC
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#define _PIND (uint8_t *const)&PIND
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#define _PINE (uint8_t *const)&PINE
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#define _PINF (uint8_t *const)&PINF
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#define _PORTA (uint8_t *const)&PORTA
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#define _PORTB (uint8_t *const)&PORTB
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#define _PORTC (uint8_t *const)&PORTC
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#define _PORTD (uint8_t *const)&PORTD
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#define _PORTE (uint8_t *const)&PORTE
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#define _PORTF (uint8_t *const)&PORTF
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#define _BIT0 0x01
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#define _BIT1 0x02
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#define _BIT2 0x04
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#define _BIT3 0x08
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#define _BIT4 0x10
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#define _BIT5 0x20
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#define _BIT6 0x40
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#define _BIT7 0x80
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/* Specifies the ports and pin numbers for the rows */
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static
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uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB, _DDRB, _DDRB, _DDRB, _DDRB, _DDRB};
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static
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uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB};
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static
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uint8_t *const row_pin[MATRIX_ROWS] = {_PINB, _PINB, _PINB, _PINB, _PINB, _PINB};
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static
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const uint8_t row_bit[MATRIX_ROWS] = { _BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5};
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/* Specifies the ports and pin numbers for the columns */
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static
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uint8_t *const col_ddr[MATRIX_COLS] = { _DDRD, _DDRC, _DDRC, _DDRD, _DDRD, _DDRE,
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_DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF,
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_DDRD, _DDRD, _DDRD, _DDRD, _DDRD};
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static
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uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE,
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_PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF,
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_PORTD, _PORTD, _PORTD, _PORTD, _PORTD};
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static
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const uint8_t col_bit[MATRIX_COLS] = { _BIT5, _BIT7, _BIT6, _BIT4, _BIT0, _BIT6,
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_BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7,
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_BIT7, _BIT6, _BIT1, _BIT2, _BIT3};
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static
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inline void pull_column(int col) {
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*col_port[col] &= ~col_bit[col];
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}
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static
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inline void release_column(int col) {
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*col_port[col] |= col_bit[col];
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}
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/* PORTB is set as input with pull-up resistors
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PORTC,D,E,F are set to high output */
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static
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void setup_io_pins(void) {
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uint8_t row, col;
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for(row = 0; row < MATRIX_ROWS; row++) {
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*row_ddr[row] &= ~row_bit[row];
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*row_port[row] |= row_bit[row];
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}
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for(col = 0; col < MATRIX_COLS; col++) {
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*col_ddr[col] |= col_bit[col];
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*col_port[col] |= col_bit[col];
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}
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}
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/* LEDs are on output compare pins OC1B OC1C
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This activates fast PWM mode on them.
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Prescaler 256 and 8-bit counter results in
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16000000/256/256 = 244 Hz blink frequency.
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LED_A: Caps Lock
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LED_B: Scroll Lock */
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/* Output on PWM pins are turned off when the timer
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reaches the value in the output compare register,
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and are turned on when it reaches TOP (=256). */
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static
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void setup_leds(void) {
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TCCR1A |= // Timer control register 1A
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(1<<WGM10) | // Fast PWM 8-bit
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(1<<COM1B1)| // Clear OC1B on match, set at TOP
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(1<<COM1C1); // Clear OC1C on match, set at TOP
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TCCR1B |= // Timer control register 1B
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(1<<WGM12) | // Fast PWM 8-bit
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(1<<CS12); // Prescaler 256
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OCR1B = 250; // Output compare register 1B
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OCR1C = 250; // Output compare register 1C
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// LEDs: LED_A -> PORTB6, LED_B -> PORTB7
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DDRB &= 0x3F;
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PORTB &= 0x3F;
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}
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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// To use PORTF disable JTAG with writing JTD bit twice within four cycles.
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MCUCR |= (1<<JTD);
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MCUCR |= (1<<JTD);
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// initialize row and col
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setup_io_pins();
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setup_leds();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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matrix_debouncing[i] = 0;
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}
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}
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uint8_t matrix_scan(void)
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{
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for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16
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pull_column(col); // output hi on theline
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_delay_us(3); // without this wait it won't read stable value.
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
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bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col);
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bool curr_bit = !(*row_pin[row] & row_bit[row]);
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if (prev_bit != curr_bit) {
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matrix_debouncing[row] ^= ((matrix_row_t)1<<col);
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if (debouncing) {
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debug("bounce!: "); debug_hex(debouncing); print("\n");
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}
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debouncing = DEBOUNCE;
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}
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}
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release_column(col);
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}
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if (debouncing) {
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if (--debouncing) {
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_delay_ms(1);
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} else {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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}
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}
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return 1;
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}
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bool matrix_is_modified(void)
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{
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// NOTE: no longer used
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return true;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<<col));
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 01234567\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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pbin_reverse(matrix_get_row(row));
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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for (uint8_t j = 0; j < MATRIX_COLS; j++) {
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if (matrix_is_on(i, j))
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count++;
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}
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}
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return count;
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}
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