105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/* Copyright 2018-2021 James Laird-Wah, Islam Sharabash
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "quantum.h"
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#include "i2c_master.h"
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#include <string.h>
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#include "wire-protocol-constants.h"
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// shifting << 1 is because drivers/chibios/i2c_master.h expects the address
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// shifted.
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// 0x58 and 0x59 are the addresses defined in dygma/raise/Hand.h
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#define I2C_ADDR_LEFT (0x58 << 1)
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#define I2C_ADDR_RIGHT (0x59 << 1)
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#define I2C_ADDR(hand) ((hand) ? I2C_ADDR_RIGHT : I2C_ADDR_LEFT)
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#define LEFT 0
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#define RIGHT 1
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/* If no key events have occurred, the scanners will time out on reads.
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* So we don't want to be too permissive here. */
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// TODO(ibash) not convinced this is needed...
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#define MY_I2C_TIMEOUT 10
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#define ROWS_PER_HAND (MATRIX_ROWS / 2)
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typedef enum { CHANGED, OFFLINE, UNCHANGED } read_hand_t;
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static read_hand_t last_state[2] = {OFFLINE, OFFLINE};
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static read_hand_t i2c_read_hand(int hand, matrix_row_t current_matrix[]) {
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// dygma raise firmware says online is true iff we get the number of
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// expected bytes (e.g. 6 bytes or ROWS_PER_HAND + 1).
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// In the case where no keys are pressed the keyscanner will send the same 0
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// byte over and over. -- so this case is set.
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//
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// On the stm32 side if we don't get as many bytes as expecetd the
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// i2c_receive times out -- so online can be defined as getting
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// "I2C_STATUS_SUCCESS".
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uint8_t buf[ROWS_PER_HAND + 1];
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i2c_status_t ret = i2c_receive(I2C_ADDR(hand), buf, sizeof(buf), MY_I2C_TIMEOUT);
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if (ret != I2C_STATUS_SUCCESS) {
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return OFFLINE;
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}
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if (buf[0] != TWI_REPLY_KEYDATA) {
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return UNCHANGED;
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}
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int start_row = hand ? ROWS_PER_HAND : 0;
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matrix_row_t *out = ¤t_matrix[start_row];
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memcpy(out, &buf[1], ROWS_PER_HAND);
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return CHANGED;
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}
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static int i2c_set_keyscan_interval(int hand, int delay) {
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uint8_t buf[] = {TWI_CMD_KEYSCAN_INTERVAL, delay};
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i2c_status_t ret = i2c_transmit(I2C_ADDR(hand), buf, sizeof(buf), MY_I2C_TIMEOUT);
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return ret;
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}
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void matrix_init_custom(void) {
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i2c_init();
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// ref: https://github.com/Dygmalab/Kaleidoscope/blob/7bac53de106c42ffda889e6854abc06cf43a3c6f/src/kaleidoscope/device/dygma/Raise.cpp#L83
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// ref: https://github.com/Dygmalab/Kaleidoscope/blob/7bac53de106c42ffda889e6854abc06cf43a3c6f/src/kaleidoscope/device/dygma/raise/Hand.cpp#L73
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i2c_set_keyscan_interval(LEFT, 50);
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i2c_set_keyscan_interval(RIGHT, 50);
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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// HACK(ibash) without the delay between the two calls to i2c_read_hand, the
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// second call to i2c_read_hand breaks. I observed that the i2s start isn't
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// sent, or maybe it is, but the address matcher in the attiny can't recognize
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// it. In any case, a short delay fixes it.
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read_hand_t left_state = i2c_read_hand(LEFT, current_matrix);
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wait_us(10);
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read_hand_t right_state = i2c_read_hand(RIGHT, current_matrix);
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if ((last_state[LEFT] == OFFLINE && left_state != OFFLINE) || (last_state[RIGHT] == OFFLINE && right_state != OFFLINE)) {
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// reinitialize both sides
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i2c_set_keyscan_interval(LEFT, 50);
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i2c_set_keyscan_interval(RIGHT, 50);
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}
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last_state[LEFT] = left_state;
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last_state[RIGHT] = right_state;
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bool matrix_has_changed = left_state == CHANGED || right_state == CHANGED;
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return matrix_has_changed;
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}
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