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/* 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");
}
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