diff options
Diffstat (limited to 'keyboards/handwired/dygma/raise/matrix.c')
| -rw-r--r-- | keyboards/handwired/dygma/raise/matrix.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/keyboards/handwired/dygma/raise/matrix.c b/keyboards/handwired/dygma/raise/matrix.c new file mode 100644 index 0000000000..bbcf697a59 --- /dev/null +++ b/keyboards/handwired/dygma/raise/matrix.c @@ -0,0 +1,104 @@ +/* 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; +} |