- /*
- Copyright 2012 Jun Wako
- Copyright 2014 Jack Humbert
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "quantum.h"
- #include "matrix.h"
- #include "uart.h"
-
- #define UART_MATRIX_RESPONSE_TIMEOUT 10000
-
- void matrix_init_custom(void) {
- uart_init(1000000);
- }
-
- bool matrix_scan_custom(matrix_row_t current_matrix[]) {
- uint32_t timeout = 0;
- bool changed = false;
-
- //the s character requests the RF slave to send the matrix
- uart_write('s');
-
- //trust the external keystates entirely, erase the last data
- uint8_t uart_data[13] = {0};
-
- //there are 12 bytes corresponding to 12 columns, and an end byte
- for (uint8_t i = 0; i < 13; i++) {
- //wait for the serial data, timeout if it's been too long
- //this only happened in testing with a loose wire, but does no
- //harm to leave it in here
- while (!uart_available()) {
- timeout++;
- if (timeout > UART_MATRIX_RESPONSE_TIMEOUT) {
- break;
- }
- }
-
- if (timeout < UART_MATRIX_RESPONSE_TIMEOUT) {
- uart_data[i] = uart_read();
- } else {
- uart_data[i] = 0x00;
- }
- }
-
- //check for the end packet, the key state bytes use the LSBs, so 0xE0
- //will only show up here if the correct bytes were recieved
- if (uart_data[11] == 0xE0) {
- //shifting and transferring the keystates to the QMK matrix variable
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- matrix_row_t current_row = (uint16_t) uart_data[i * 2] | (uint16_t) uart_data[i * 2 + 1] << 6;
- if (current_matrix[i] != current_row) {
- changed = true;
- }
- current_matrix[i] = current_row;
- }
- }
-
- return changed;
- }
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