mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-12-15 14:13:27 +00:00
184 lines
5.2 KiB
C
184 lines
5.2 KiB
C
|
/* Copyright 2023 Cipulot
|
||
|
*
|
||
|
* 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 "ec_switch_matrix.h"
|
||
|
#include "analog.h"
|
||
|
#include "atomic_util.h"
|
||
|
#include "print.h"
|
||
|
#include "wait.h"
|
||
|
|
||
|
/* Pin and port array */
|
||
|
const uint32_t row_pins[] = MATRIX_ROW_PINS;
|
||
|
const uint8_t col_channels[] = MATRIX_COL_CHANNELS;
|
||
|
const uint32_t mux_sel_pins[] = MUX_SEL_PINS;
|
||
|
|
||
|
static ecsm_config_t config;
|
||
|
static uint16_t ecsm_sw_value[MATRIX_ROWS][MATRIX_COLS];
|
||
|
|
||
|
static adc_mux adcMux;
|
||
|
|
||
|
static inline void discharge_capacitor(void) {
|
||
|
writePinLow(DISCHARGE_PIN);
|
||
|
}
|
||
|
static inline void charge_capacitor(uint8_t row) {
|
||
|
writePinHigh(DISCHARGE_PIN);
|
||
|
writePinHigh(row_pins[row]);
|
||
|
}
|
||
|
|
||
|
static inline void init_mux_sel(void) {
|
||
|
for (int idx = 0; idx < 3; idx++) {
|
||
|
setPinOutput(mux_sel_pins[idx]);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static inline void select_mux(uint8_t col) {
|
||
|
uint8_t ch = col_channels[col];
|
||
|
writePin(mux_sel_pins[0], ch & 1);
|
||
|
writePin(mux_sel_pins[1], ch & 2);
|
||
|
writePin(mux_sel_pins[2], ch & 4);
|
||
|
}
|
||
|
|
||
|
static inline void init_row(void) {
|
||
|
for (int idx = 0; idx < MATRIX_ROWS; idx++) {
|
||
|
setPinOutput(row_pins[idx]);
|
||
|
writePinLow(row_pins[idx]);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Initialize the peripherals pins */
|
||
|
int ecsm_init(ecsm_config_t const* const ecsm_config) {
|
||
|
// Initialize config
|
||
|
config = *ecsm_config;
|
||
|
|
||
|
palSetLineMode(ANALOG_PORT, PAL_MODE_INPUT_ANALOG);
|
||
|
adcMux = pinToMux(ANALOG_PORT);
|
||
|
|
||
|
// Dummy call to make sure that adcStart() has been called in the appropriate state
|
||
|
adc_read(adcMux);
|
||
|
|
||
|
// Initialize discharge pin as discharge mode
|
||
|
writePinLow(DISCHARGE_PIN);
|
||
|
setPinOutputOpenDrain(DISCHARGE_PIN);
|
||
|
|
||
|
// Initialize drive lines
|
||
|
init_row();
|
||
|
|
||
|
// Initialize multiplexer select pin
|
||
|
init_mux_sel();
|
||
|
|
||
|
// Enable AMUX
|
||
|
setPinOutput(APLEX_EN_PIN_0);
|
||
|
writePinLow(APLEX_EN_PIN_0);
|
||
|
setPinOutput(APLEX_EN_PIN_1);
|
||
|
writePinLow(APLEX_EN_PIN_1);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int ecsm_update(ecsm_config_t const* const ecsm_config) {
|
||
|
// Save config
|
||
|
config = *ecsm_config;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
// Read the capacitive sensor value
|
||
|
uint16_t ecsm_readkey_raw(uint8_t channel, uint8_t row, uint8_t col) {
|
||
|
uint16_t sw_value = 0;
|
||
|
|
||
|
// Select the multiplexer
|
||
|
if (channel == 0) {
|
||
|
writePinHigh(APLEX_EN_PIN_0);
|
||
|
select_mux(col);
|
||
|
writePinLow(APLEX_EN_PIN_0);
|
||
|
} else {
|
||
|
writePinHigh(APLEX_EN_PIN_1);
|
||
|
select_mux(col);
|
||
|
writePinLow(APLEX_EN_PIN_1);
|
||
|
}
|
||
|
|
||
|
// Set strobe pins to low state
|
||
|
writePinLow(row_pins[row]);
|
||
|
ATOMIC_BLOCK_FORCEON {
|
||
|
// Set the row pin to high state and have capacitor charge
|
||
|
charge_capacitor(row);
|
||
|
// Read the ADC value
|
||
|
sw_value = adc_read(adcMux);
|
||
|
}
|
||
|
// Discharge peak hold capacitor
|
||
|
discharge_capacitor();
|
||
|
// Waiting for the ghost capacitor to discharge fully
|
||
|
wait_us(DISCHARGE_TIME);
|
||
|
|
||
|
return sw_value;
|
||
|
}
|
||
|
|
||
|
// Update press/release state of key
|
||
|
bool ecsm_update_key(matrix_row_t* current_row, uint8_t row, uint8_t col, uint16_t sw_value) {
|
||
|
bool current_state = (*current_row >> col) & 1;
|
||
|
|
||
|
// Press to release
|
||
|
if (current_state && sw_value < config.ecsm_actuation_threshold) {
|
||
|
*current_row &= ~(1 << col);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
// Release to press
|
||
|
if ((!current_state) && sw_value > config.ecsm_release_threshold) {
|
||
|
*current_row |= (1 << col);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// Scan key values and update matrix state
|
||
|
bool ecsm_matrix_scan(matrix_row_t current_matrix[]) {
|
||
|
bool updated = false;
|
||
|
|
||
|
// Disable AMUX of channel 1
|
||
|
writePinHigh(APLEX_EN_PIN_1);
|
||
|
for (int col = 0; col < sizeof(col_channels); col++) {
|
||
|
for (int row = 0; row < MATRIX_ROWS; row++) {
|
||
|
ecsm_sw_value[row][col] = ecsm_readkey_raw(0, row, col);
|
||
|
updated |= ecsm_update_key(¤t_matrix[row], row, col, ecsm_sw_value[row][col]);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// Disable AMUX of channel 1
|
||
|
writePinHigh(APLEX_EN_PIN_0);
|
||
|
for (int col = 0; col < (sizeof(col_channels) - 1); col++) {
|
||
|
for (int row = 0; row < MATRIX_ROWS; row++) {
|
||
|
ecsm_sw_value[row][col + 8] = ecsm_readkey_raw(1, row, col);
|
||
|
updated |= ecsm_update_key(¤t_matrix[row], row, col + 8, ecsm_sw_value[row][col + 8]);
|
||
|
}
|
||
|
}
|
||
|
return updated;
|
||
|
}
|
||
|
|
||
|
// Debug print key values
|
||
|
void ecsm_print_matrix(void) {
|
||
|
for (int row = 0; row < MATRIX_ROWS; row++) {
|
||
|
for (int col = 0; col < MATRIX_COLS; col++) {
|
||
|
uprintf("%4d", ecsm_sw_value[row][col]);
|
||
|
if (col < (MATRIX_COLS - 1)) {
|
||
|
print(",");
|
||
|
}
|
||
|
}
|
||
|
print("\n");
|
||
|
}
|
||
|
print("\n");
|
||
|
}
|