matrix.c (2324B)
1 /* Copyright 2017 Mattia Dal Ben 2 * 3 * This program is free software: you can redistribute it and/or modify 4 * it under the terms of the GNU General Public License as published by 5 * the Free Software Foundation, either version 2 of the License, or 6 * (at your option) any later version. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include "matrix.h" 18 #include "uart.h" 19 20 #define UART_MATRIX_RESPONSE_TIMEOUT 10000 21 22 void matrix_init_custom(void) { 23 uart_init(1000000); 24 } 25 26 bool matrix_scan_custom(matrix_row_t current_matrix[]) { 27 uint32_t timeout = 0; 28 bool changed = false; 29 30 //the s character requests the RF slave to send the matrix 31 uart_write('s'); 32 33 //trust the external keystates entirely, erase the last data 34 uint8_t uart_data[11] = {0}; 35 36 //there are 10 bytes corresponding to 10 columns, and then an end byte 37 for (uint8_t i = 0; i < 11; i++) { 38 //wait for the serial data, timeout if it's been too long 39 //this only happened in testing with a loose wire, but does no 40 //harm to leave it in here 41 while (!uart_available()) { 42 timeout++; 43 if (timeout > UART_MATRIX_RESPONSE_TIMEOUT) { 44 break; 45 } 46 } 47 48 if (timeout < UART_MATRIX_RESPONSE_TIMEOUT) { 49 uart_data[i] = uart_read(); 50 } else { 51 uart_data[i] = 0x00; 52 } 53 } 54 55 //check for the end packet, the key state bytes use the LSBs, so 0xE0 56 //will only show up here if the correct bytes were recieved 57 if (uart_data[10] == 0xE0) { 58 //shifting and transferring the keystates to the QMK matrix variable 59 for (uint8_t i = 0; i < MATRIX_ROWS; i++) { 60 matrix_row_t current_row = (uint16_t) uart_data[i * 2] | (uint16_t) uart_data[i * 2 + 1] << 7; 61 if (current_matrix[i] != current_row) { 62 changed = true; 63 } 64 current_matrix[i] = current_row; 65 } 66 } 67 68 return changed; 69 }