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108 lines
2.6 KiB
108 lines
2.6 KiB
11 years ago
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#include <stdint.h>
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#include <stdbool.h>
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#include "gpio_api.h"
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#include "timer.h"
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#include "wait.h"
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#include "matrix.h"
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#ifndef DEBOUNCE
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#define DEBOUNCE 5
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#endif
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/*
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* Infinity Pinusage:
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* Column pins are input with internal pull-down. Row pins are output and strobe with high.
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* Key is high or 1 when it turns on.
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*
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* col: { PTD1, PTD2, PTD3, PTD4, PTD5, PTD6, PTD7 }
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* row: { PTB0, PTB1, PTB2, PTB3, PTB16, PTB17, PTC4, PTC5, PTD0 }
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*/
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static gpio_t col[MATRIX_COLS];
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static gpio_t row[MATRIX_ROWS];
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/* matrix 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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static bool debouncing = false;
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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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/* Column(sense) */
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gpio_init_in_ex(&col[0], PTD1, PullDown);
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gpio_init_in_ex(&col[1], PTD2, PullDown);
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gpio_init_in_ex(&col[2], PTD3, PullDown);
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gpio_init_in_ex(&col[3], PTD4, PullDown);
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gpio_init_in_ex(&col[4], PTD5, PullDown);
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gpio_init_in_ex(&col[5], PTD6, PullDown);
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gpio_init_in_ex(&col[6], PTD7, PullDown);
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/* Row(strobe) */
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gpio_init_out_ex(&row[0], PTB0, 0);
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gpio_init_out_ex(&row[1], PTB1, 0);
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gpio_init_out_ex(&row[2], PTB2, 0);
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gpio_init_out_ex(&row[3], PTB3, 0);
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gpio_init_out_ex(&row[4], PTB16, 0);
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gpio_init_out_ex(&row[5], PTB17, 0);
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gpio_init_out_ex(&row[6], PTC4, 0);
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gpio_init_out_ex(&row[7], PTC5, 0);
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gpio_init_out_ex(&row[8], PTD0, 0);
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}
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uint8_t matrix_scan(void)
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{
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for (int i = 0; i < MATRIX_ROWS; i++) {
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matrix_row_t r = 0;
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gpio_write(&row[i], 1);
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wait_us(1); // need wait to settle pin state
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for (int j = 0; j < MATRIX_COLS; j++) {
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if (gpio_read(&col[j])) {
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r |= (1<<j);
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}
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}
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gpio_write(&row[i], 0);
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if (matrix_debouncing[i] != r) {
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matrix_debouncing[i] = r;
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debouncing = true;
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debouncing_time = timer_read();
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}
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}
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if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
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for (int i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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debouncing = false;
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}
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/*
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if (debouncing) {
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if (--debouncing) {
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return 0;
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} else {
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for (int 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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*/
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return 1;
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}
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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] & (1<<col));
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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 matrix_print(void)
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{
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}
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