forked from forks/qmk_firmware
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/*
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Copyright 2012 Jun Wako
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Copyright 2014 Jack Humbert
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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 "uart.h"
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#define UART_MATRIX_RESPONSE_TIMEOUT 10000
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void matrix_init_custom(void) {
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uart_init(1000000);
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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uint32_t timeout = 0;
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bool changed = false;
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//the s character requests the RF slave to send the matrix
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uart_write('s');
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//trust the external keystates entirely, erase the last data
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uint8_t uart_data[14] = {0};
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//there are 10 bytes corresponding to 10 columns, and an end byte
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for (uint8_t i = 0; i < 14; i++) {
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//wait for the serial data, timeout if it's been too long
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//this only happened in testing with a loose wire, but does no
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//harm to leave it in here
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while (!uart_available()) {
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timeout++;
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if (timeout > UART_MATRIX_RESPONSE_TIMEOUT) {
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break;
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}
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}
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if (timeout < UART_MATRIX_RESPONSE_TIMEOUT) {
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uart_data[i] = uart_read();
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} else {
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uart_data[i] = 0x00;
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}
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}
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//check for the end packet, the key state bytes use the LSBs, so 0xE0
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//will only show up here if the correct bytes were recieved
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if (uart_data[10] == 0xE0) {
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//shifting and transferring the keystates to the QMK matrix variable
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix_row_t current_row = (uint16_t) uart_data[i * 2] | (uint16_t) uart_data[i * 2 + 1] << 6;
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if (current_matrix[i] != current_row) {
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changed = true;
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}
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current_matrix[i] = current_row;
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}
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}
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return changed;
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}
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