91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* Copyright 2019
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*
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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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*
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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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*
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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 "pca9555.h"
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// PCA9555 slave addresses
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#define IC1 0x20
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#define IC2 0x21
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//_____Utility funcs___________________________________________________________
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static void init_pins(void) {
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// init all rows - IC1 port0 input
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pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT); // same as initial state
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// init all cols high - IC2 all input
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pca9555_set_config(IC1, PCA9555_PORT1, ALL_INPUT); // same as initial state
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pca9555_set_config(IC2, PCA9555_PORT0, ALL_INPUT); // same as initial state
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pca9555_set_config(IC2, PCA9555_PORT1, ALL_INPUT); // same as initial state
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pca9555_set_output(IC1, PCA9555_PORT0, ALL_LOW);
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}
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static void select_row(uint8_t row) {
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// For the Southpaw Ext 65% pins 1-6 are used for the rows
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uint8_t pin = row;
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uint8_t mask = 2 << pin;
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pca9555_set_config(IC1, PCA9555_PORT0, ALL_INPUT & (~mask));
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}
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static uint32_t read_cols(void) {
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//Read column inputs. Pins 13-31 are used. Split across both ICs but they are sequential
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uint8_t state_1 = 0;
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uint8_t state_2 = 0;
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uint8_t state_3 = 0;
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pca9555_read_pins(IC1, PCA9555_PORT1, &state_1);
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pca9555_read_pins(IC2, PCA9555_PORT0, &state_2);
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pca9555_read_pins(IC2, PCA9555_PORT1, &state_3);
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uint32_t state = ((((uint32_t)state_3 & 0b01111111) << 12) | ((uint32_t)state_2 << 4) | (((uint32_t)state_1 & 0b11110000) >> 4));
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return ~state;
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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 selection to stabilize
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select_row(current_row);
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// Skip the wait_us(30); as i2c is slow enough to debounce the io changes
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current_matrix[current_row] = read_cols();
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// No need to Unselect row as the next `select_row` will blank everything
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return (last_row_value != current_matrix[current_row]);
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}
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//_____CUSTOM MATRIX IMPLEMENTATION____________________________________________________
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void matrix_init_custom(void) {
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pca9555_init(IC1);
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pca9555_init(IC2);
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init_pins();
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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changed |= read_cols_on_row(current_matrix, current_row);
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}
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return changed;
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}
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