136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/*
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Copyright 2021 Matthew Dias
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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 "matrix.h"
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#include "wait.h"
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#include "i2c_master.h"
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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static void unselect_rows(void) {
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for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
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gpio_set_pin_input_high(row_pins[x]);
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}
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}
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static void select_row(uint8_t row) {
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gpio_set_pin_output(row_pins[row]);
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gpio_write_pin_low(row_pins[row]);
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}
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static void unselect_row(uint8_t row) {
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gpio_set_pin_input_high(row_pins[row]);
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}
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static void init_pins(void) {
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unselect_rows();
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// Set I/O
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uint8_t send_data[2] = { 0xFF, 0x03};
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i2c_write_register((PORT_EXPANDER_ADDRESS << 1), 0x00, &send_data[0], 2, 20);
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// Set Pull-up
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i2c_write_register((PORT_EXPANDER_ADDRESS << 1), 0x0C, &send_data[0], 2, 20);
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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if ( x < 8 ) {
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gpio_set_pin_input_high(col_pins[x]);
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}
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}
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}
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void matrix_init_custom(void) {
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// TODO: initialize hardware here
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// Initialize I2C
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i2c_init();
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// initialize key pins
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init_pins();
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wait_ms(50);
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_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 and wait for row selecton to stabilize
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select_row(current_row);
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matrix_io_delay();
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uint8_t port_expander_col_buffer[2];
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i2c_read_register((PORT_EXPANDER_ADDRESS << 1), 0x12, &port_expander_col_buffer[0], 2, 20);
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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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uint8_t pin_state;
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// Select the col pin to read (active low)
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switch (col_index) {
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case 8 :
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pin_state = port_expander_col_buffer[0] & (1 << 0);
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break;
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case 9 :
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pin_state = port_expander_col_buffer[0] & (1 << 1);
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break;
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case 10 :
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pin_state = port_expander_col_buffer[0] & (1 << 2);
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break;
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case 11 :
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pin_state = port_expander_col_buffer[0] & (1 << 3);
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break;
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case 12 :
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pin_state = port_expander_col_buffer[0] & (1 << 4);
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break;
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case 13 :
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pin_state = port_expander_col_buffer[0] & (1 << 5);
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break;
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case 14 :
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pin_state = port_expander_col_buffer[0] & (1 << 6);
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break;
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case 15 :
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pin_state = port_expander_col_buffer[0] & (1 << 7);
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break;
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case 16 :
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pin_state = port_expander_col_buffer[1] & (1 << 0);
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break;
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case 17 :
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pin_state = port_expander_col_buffer[1] & (1 << 1);
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break;
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default :
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pin_state = gpio_read_pin(col_pins[col_index]);
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}
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// Populate the matrix row with the state of the col pin
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current_matrix[current_row] |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
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}
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// Unselect row
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unselect_row(current_row);
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return (last_row_value != current_matrix[current_row]);
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool matrix_has_changed = false;
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// Set row, read cols
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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matrix_has_changed |= read_cols_on_row(current_matrix, current_row);
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}
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return matrix_has_changed;
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}
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