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/* 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;
}
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