/* Copyright 2018-2021 James Laird-Wah, Islam Sharabash * * 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 "i2c_master.h" #include <string.h> #include "wire-protocol-constants.h" // shifting << 1 is because drivers/chibios/i2c_master.h expects the address // shifted. // 0x58 and 0x59 are the addresses defined in dygma/raise/Hand.h #define I2C_ADDR_LEFT (0x58 << 1) #define I2C_ADDR_RIGHT (0x59 << 1) #define I2C_ADDR(hand) ((hand) ? I2C_ADDR_RIGHT : I2C_ADDR_LEFT) #define LEFT 0 #define RIGHT 1 /* If no key events have occurred, the scanners will time out on reads. * So we don't want to be too permissive here. */ // TODO(ibash) not convinced this is needed... #define MY_I2C_TIMEOUT 10 #define ROWS_PER_HAND (MATRIX_ROWS / 2) typedef enum { CHANGED, OFFLINE, UNCHANGED } read_hand_t; static read_hand_t last_state[2] = {OFFLINE, OFFLINE}; static read_hand_t i2c_read_hand(int hand, matrix_row_t current_matrix[]) { // dygma raise firmware says online is true iff we get the number of // expected bytes (e.g. 6 bytes or ROWS_PER_HAND + 1). // In the case where no keys are pressed the keyscanner will send the same 0 // byte over and over. -- so this case is set. // // On the stm32 side if we don't get as many bytes as expecetd the // i2c_receive times out -- so online can be defined as getting // "I2C_STATUS_SUCCESS". uint8_t buf[ROWS_PER_HAND + 1]; i2c_status_t ret = i2c_receive(I2C_ADDR(hand), buf, sizeof(buf), MY_I2C_TIMEOUT); if (ret != I2C_STATUS_SUCCESS) { return OFFLINE; } if (buf[0] != TWI_REPLY_KEYDATA) { return UNCHANGED; } int start_row = hand ? ROWS_PER_HAND : 0; matrix_row_t *out = ¤t_matrix[start_row]; memcpy(out, &buf[1], ROWS_PER_HAND); return CHANGED; } static int i2c_set_keyscan_interval(int hand, int delay) { uint8_t buf[] = {TWI_CMD_KEYSCAN_INTERVAL, delay}; i2c_status_t ret = i2c_transmit(I2C_ADDR(hand), buf, sizeof(buf), MY_I2C_TIMEOUT); return ret; } void matrix_init_custom(void) { i2c_init(); // ref: https://github.com/Dygmalab/Kaleidoscope/blob/7bac53de106c42ffda889e6854abc06cf43a3c6f/src/kaleidoscope/device/dygma/Raise.cpp#L83 // ref: https://github.com/Dygmalab/Kaleidoscope/blob/7bac53de106c42ffda889e6854abc06cf43a3c6f/src/kaleidoscope/device/dygma/raise/Hand.cpp#L73 i2c_set_keyscan_interval(LEFT, 50); i2c_set_keyscan_interval(RIGHT, 50); } bool matrix_scan_custom(matrix_row_t current_matrix[]) { // HACK(ibash) without the delay between the two calls to i2c_read_hand, the // second call to i2c_read_hand breaks. I observed that the i2s start isn't // sent, or maybe it is, but the address matcher in the attiny can't recognize // it. In any case, a short delay fixes it. read_hand_t left_state = i2c_read_hand(LEFT, current_matrix); wait_us(10); read_hand_t right_state = i2c_read_hand(RIGHT, current_matrix); if ((last_state[LEFT] == OFFLINE && left_state != OFFLINE) || (last_state[RIGHT] == OFFLINE && right_state != OFFLINE)) { // reinitialize both sides i2c_set_keyscan_interval(LEFT, 50); i2c_set_keyscan_interval(RIGHT, 50); } last_state[LEFT] = left_state; last_state[RIGHT] = right_state; bool matrix_has_changed = left_state == CHANGED || right_state == CHANGED; return matrix_has_changed; }