285 lines
6.6 KiB
C
285 lines
6.6 KiB
C
/*
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Copyright 2018 listofoptions <listofoptions@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#if defined(__AVR__)
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#include <avr/io.h>
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#endif
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#include <util/delay.h>
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#include "wait.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 "timer.h"
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#include "config.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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#define print_matrix_header() print("\nr/c 01234567\n")
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#define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
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#define matrix_bitpop(i) bitpop(matrix[i])
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#define ROW_SHIFTER ((uint8_t)1)
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#define check_bit(var,pos) ((var) & (1<<(pos)))
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#define NUM_ROW_PINS 5
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#define NUM_COL_PINS 2
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static const uint8_t row_pins [NUM_ROW_PINS] = MATRIX_ROW_PINS ;
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static const uint8_t col_pins [NUM_ROW_PINS] = MATRIX_COL_PINS ;
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#if ( DEBOUNCE > 0 )
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static uint16_t debouncing_time ;
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static bool debouncing = false ;
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#endif
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static uint8_t matrix [MATRIX_ROWS] = {0};
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#if ( DEBOUNCE > 0 )
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static uint8_t matrix_debounce [MATRIX_ROWS] = {0};
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#endif
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static
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inline
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void toggle_led(void) {
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uint8_t pin = LED_PIN ;
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_SFR_IO8((pin >> 4) + 2) ^= _BV(pin & 0xF);
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}
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static
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inline
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void init_led(void) {
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uint8_t pin = LED_PIN ;
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_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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static
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inline
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void init_data(void) {
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uint8_t pin = MATRIX_DATA_PIN ;
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_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // LO
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}
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static
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inline
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void init_strobe(void) {
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uint8_t pin = MATRIX_STROBE_PIN ;
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_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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}
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static
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inline
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void init_rows(void) {
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for ( uint8_t i = 0 ; i < NUM_ROW_PINS; ++i ) {
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uint8_t pin = row_pins[i];
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_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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}
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static
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inline
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void init_cols(void) {
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for ( uint8_t i = 0 ; i < NUM_COL_PINS; ++i ) {
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uint8_t pin = col_pins[i];
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_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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}
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static
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inline
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void select_row(uint8_t current_row) {
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for ( uint8_t i = 0 ; i < NUM_ROW_PINS; ++i ) {
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uint8_t pin = row_pins[i] ;
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if ( check_bit( current_row, i ) ) {
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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} else {
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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}
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wait_us(30) ;
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}
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static
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inline
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void select_col(uint8_t current_col) {
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for ( uint8_t i = 0 ; i < NUM_COL_PINS; ++i ) {
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uint8_t pin = col_pins[i] ;
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if ( check_bit( current_col, i ) ) {
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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} else {
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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}
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wait_us(30) ;
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}
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static
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inline
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uint8_t matrix_strobe(uint8_t col_index) {
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uint8_t strobe_pin = MATRIX_STROBE_PIN ;
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uint8_t data_pin = MATRIX_DATA_PIN ;
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// set strobe pin low
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_SFR_IO8((strobe_pin >> 4) + 2) &= ~_BV(strobe_pin & 0xF);
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wait_us(30) ;
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// read data
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uint8_t data = (_SFR_IO8(data_pin >> 4) & _BV(data_pin & 0xF)) ;
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// set strobe pin hi
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_SFR_IO8((strobe_pin >> 4) + 2) |= _BV(strobe_pin & 0xF);
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uint8_t out = data ? (1 << col_index) : 0 ;
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return out ;
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}
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static
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bool matrix_read(uint8_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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uint8_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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select_row(current_row);
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// For each col...
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for(uint8_t col_index = 0; col_index < MATRIX_COLS; ++col_index) {
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select_col(col_index) ;
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// strobe the matrix
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// Populate the matrix row with the state of the data pin
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current_matrix[current_row] |= matrix_strobe(col_index) ;
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}
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bool test = last_row_value != current_matrix[current_row] ;
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return test ;
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}
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__attribute__ ((weak))
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void matrix_init_quantum(void) {
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matrix_init_kb();
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}
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__attribute__ ((weak))
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void matrix_scan_quantum(void) {
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matrix_scan_kb();
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}
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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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__attribute__ ((weak))
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void matrix_init_user(void) {
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}
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__attribute__ ((weak))
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void matrix_scan_user(void) {
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}
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inline
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uint8_t matrix_rows(void) {
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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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return MATRIX_COLS;
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}
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inline
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uint8_t matrix_get_row(uint8_t row) {
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return matrix[row];
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}
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void matrix_init(void) {
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init_led() ;
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init_rows() ;
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init_cols() ;
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init_data() ;
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init_strobe() ;
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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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# if (DEBOUNCE > 0)
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matrix_debounce [i] = 0;
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# endif
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}
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matrix_init_quantum() ;
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}
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uint8_t matrix_scan(void) {
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for ( uint8_t current_row = 0; current_row < MATRIX_ROWS; ++current_row ) {
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# if (DEBOUNCE > 0)
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bool matrix_changed = matrix_read(matrix_debounce, current_row);
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if (matrix_changed) {
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debouncing = true ;
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debouncing_time = timer_read();
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}
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# else
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matrix_read(matrix, current_row);
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# endif
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}
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# if (DEBOUNCE > 0)
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if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCE)) {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debounce[i];
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}
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debouncing = false;
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}
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# endif
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matrix_scan_quantum();
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return 1;
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}
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void matrix_print(void) {
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print_matrix_header();
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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print_matrix_row(row);
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print("\n");
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}
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}
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