296 lines
6.0 KiB
C
296 lines
6.0 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include "wait.h"
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#include "action_layer.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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#include "ergodone.h"
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#include "expander.h"
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#ifdef DEBUG_MATRIX_SCAN_RATE
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#include "timer.h"
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#endif
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/*
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* This constant define not debouncing time in msecs, but amount of matrix
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* scan loops which should be made to get stable debounced results.
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*
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* On Ergodox matrix scan rate is relatively low, because of slow I2C.
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* Now it's only 317 scans/second, or about 3.15 msec/scan.
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* According to Cherry specs, debouncing time is 5 msec.
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*
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* And so, there is no sense to have DEBOUNCE higher than 2.
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*/
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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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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// Debouncing: store for each key the number of scans until it's eligible to
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// change. When scanning the matrix, ignore any changes in keys that have
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// already changed in the last DEBOUNCE scans.
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static uint8_t debounce_matrix[MATRIX_ROWS * MATRIX_COLS];
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static matrix_row_t read_cols(uint8_t row);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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#ifdef DEBUG_MATRIX_SCAN_RATE
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uint32_t matrix_timer;
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uint32_t matrix_scan_count;
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#endif
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__attribute__ ((weak))
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void matrix_init_user(void) {}
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__attribute__ ((weak))
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void matrix_scan_user(void) {}
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__attribute__ ((weak))
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void) {
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matrix_scan_user();
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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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// disable JTAG
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MCUCR = (1<<JTD);
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MCUCR = (1<<JTD);
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unselect_rows();
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init_cols();
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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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for (uint8_t j=0; j < MATRIX_COLS; ++j) {
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debounce_matrix[i * MATRIX_COLS + j] = 0;
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}
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}
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_timer = timer_read32();
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matrix_scan_count = 0;
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#endif
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matrix_init_quantum();
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}
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void matrix_power_up(void) {
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unselect_rows();
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init_cols();
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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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}
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_timer = timer_read32();
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matrix_scan_count = 0;
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#endif
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}
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// Returns a matrix_row_t whose bits are set if the corresponding key should be
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// eligible to change in this scan.
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matrix_row_t debounce_mask(uint8_t row) {
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matrix_row_t result = 0;
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for (uint8_t j=0; j < MATRIX_COLS; ++j) {
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if (debounce_matrix[row * MATRIX_COLS + j]) {
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--debounce_matrix[row * MATRIX_COLS + j];
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} else {
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result |= (1 << j);
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}
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}
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return result;
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}
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// Report changed keys in the given row. Resets the debounce countdowns
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// corresponding to each set bit in 'change' to DEBOUNCE.
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void debounce_report(matrix_row_t change, uint8_t row) {
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for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
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if (change & (1 << i)) {
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debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
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}
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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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expander_scan();
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_scan_count++;
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uint32_t timer_now = timer_read32();
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if (TIMER_DIFF_32(timer_now, matrix_timer)>1000) {
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print("matrix scan frequency: ");
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pdec(matrix_scan_count);
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print("\n");
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matrix_print();
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matrix_timer = timer_now;
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matrix_scan_count = 0;
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}
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#endif
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
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wait_us(30); // without this wait read unstable value.
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matrix_row_t mask = debounce_mask(i);
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matrix_row_t cols = (read_cols(i) & mask) | (matrix[i] & ~mask);
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debounce_report(cols ^ matrix[i], i);
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matrix[i] = cols;
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unselect_rows();
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}
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matrix_scan_quantum();
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return 1;
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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 0123456789ABCDEF\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_reverse16(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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count += bitpop16(matrix[i]);
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}
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return count;
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}
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/* Column pin configuration
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*
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* Pro Micro: 6 5 4 3 2 1 0
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* PD3 PD2 PD4 PC6 PD7 PE6 PB4
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*
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* Expander: 13 12 11 10 9 8 7
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*/
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static void init_cols(void)
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{
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// Pro Micro
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DDRE &= ~(1<<PE6);
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PORTE |= (1<<PE6);
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DDRD &= ~(1<<PD2 | 1<<PD3 | 1<<PD4 | 1<<PD7);
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PORTD |= (1<<PD2 | 1<<PD3 | 1<<PD4 | 1<<PD7);
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DDRC &= ~(1<<PC6);
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PORTC |= (1<<PC6);
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DDRB &= ~(1<<PB4);
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PORTB |= (1<<PB4);
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// MCP23017
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expander_init();
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}
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static matrix_row_t read_cols(uint8_t row)
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{
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return expander_read_row() |
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(PIND&(1<<PD3) ? 0 : (1<<6)) |
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(PIND&(1<<PD2) ? 0 : (1<<5)) |
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(PIND&(1<<PD4) ? 0 : (1<<4)) |
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(PINC&(1<<PC6) ? 0 : (1<<3)) |
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(PIND&(1<<PD7) ? 0 : (1<<2)) |
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(PINE&(1<<PE6) ? 0 : (1<<1)) |
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(PINB&(1<<PB4) ? 0 : (1<<0)) ;
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}
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/* Row pin configuration
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*
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* Pro Micro: 0 1 2 3 4 5
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* F4 F5 F6 F7 B1 B2
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*
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* Expander: 0 1 2 3 4 5
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*/
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static void unselect_rows(void)
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{
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// Pro Micro
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DDRF &= ~(1<<PF4 | 1<<PF5 | 1<<PF6 | 1<<PF7);
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PORTF &= ~(1<<PF4 | 1<<PF5 | 1<<PF6 | 1<<PF7);
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DDRB &= ~(1<<PB1 | 1<<PB2);
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PORTB &= ~(1<<PB1 | 1<<PB2);
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// Expander
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expander_unselect_rows();
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}
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static void select_row(uint8_t row)
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{
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// Pro Micro
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switch (row) {
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case 0:
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DDRF |= (1<<PF4);
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PORTF &= ~(1<<PF4);
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break;
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case 1:
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DDRF |= (1<<PF5);
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PORTF &= ~(1<<PF5);
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break;
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case 2:
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DDRF |= (1<<PF6);
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PORTF &= ~(1<<PF6);
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break;
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case 3:
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DDRF |= (1<<PF7);
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PORTF &= ~(1<<PF7);
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break;
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case 4:
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DDRB |= (1<<PB1);
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PORTB &= ~(1<<PB1);
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break;
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case 5:
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DDRB |= (1<<PB2);
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PORTB &= ~(1<<PB2);
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break;
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}
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expander_select_row(row);
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}
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