83 lines
2 KiB
C
83 lines
2 KiB
C
#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include "matrix.h"
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#include "led.h"
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#include "wait.h"
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#include "timer.h"
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#include "debug.h"
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#define CLK_HI() (PORTD |= (1<<0))
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#define CLK_LO() (PORTD &= ~(1<<0))
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#define STATE() (!!(PIND & (1<<1)))
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#define RST_HI() (PORTD |= (1<<3))
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#define RST_LO() (PORTD &= ~(1<<3))
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#define SENSE() (PIND & (1<<2))
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static matrix_row_t matrix[8] = {};
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static matrix_row_t matrix_debouncing[8] = {};
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static uint16_t debouncing_time = 0;
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void matrix_init(void)
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{
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debug_enable = true;
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debug_keyboard = true;
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debug_matrix = true;
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// PD0: Clock. Counter couts up at falling edge.
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// PD1: Key State. Hi if selected key is activated.
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// PD2: Sense. Lo if any key is activated while Reset is Hi.
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// PD3: Reset. Resets counters at riging edge.
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DDRD |= (1<<3) | (1<<0); // output
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DDRD &= ~((1<<2) | (1<<1)); // input
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PORTD &= ~((1<<3) | (1<<0)); // low
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PORTD |= (1<<2) | (1<<1); // pull-up
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dprintf("init\n");
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}
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uint8_t matrix_scan(void)
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{
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// TODO: debouce & unplug detect
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// Reset counters
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RST_HI();
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wait_us(10);
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RST_LO();
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wait_us(10);
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// 8x8 matrix: row:sense, col:drive, key_on:hi
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for (uint8_t col = 0; col < 8; col++) {
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for (uint8_t row = 0; row < 8; row++) {
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CLK_HI();
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wait_us(10);
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// detect state change and start debounce
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if ((matrix_debouncing[row] & (1<<col)) ^ (STATE()<<col)) {
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matrix_debouncing[row] ^= (1<<col);
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debouncing_time = timer_read() || 1;
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}
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// proceed counter - next row
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CLK_LO();
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wait_us(10);
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}
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}
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// debounced
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if (debouncing_time && timer_elapsed(debouncing_time) > DEBOUNCE) {
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for (int row = 0; row < MATRIX_ROWS; row++) {
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matrix[row] = matrix_debouncing[row];
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}
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debouncing_time = 0;
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}
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return 1;
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}
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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 led_set(uint8_t usb_led)
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{
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}
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