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/* Copyright 2020 sekigon-gonnoc
*
* 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 "quantum.h"
#include "analog.h"
#include "print.h"
// pin connections
const uint8_t row_pins[] = MATRIX_ROW_PINS;
const uint8_t col_channels[] = MATRIX_COL_CHANNELS;
const uint8_t mux_sel_pins[] = MUX_SEL_PINS;
_Static_assert(sizeof(mux_sel_pins) == 3, "invalid MUX_SEL_PINS");
static ecsm_config_t config;
static uint16_t ecsm_sw_value[MATRIX_ROWS][MATRIX_COLS];
static inline void discharge_capacitor(void) { setPinOutput(DISCHARGE_PIN); }
static inline void charge_capacitor(uint8_t row) {
setPinInput(DISCHARGE_PIN);
writePinHigh(row_pins[row]);
}
static inline void clear_all_row_pins(void) {
for (int row = 0; row < sizeof(row_pins); row++) {
writePinLow(row_pins[row]);
}
}
static inline void init_mux_sel(void) {
for (int idx = 0; idx < sizeof(mux_sel_pins); 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 < sizeof(row_pins); idx++) {
setPinOutput(row_pins[idx]);
writePinLow(row_pins[idx]);
}
}
// Initialize pins
int ecsm_init(ecsm_config_t const* const ecsm_config) {
// save config
config = *ecsm_config;
// initialize discharge pin as discharge mode
writePinLow(DISCHARGE_PIN);
setPinOutput(DISCHARGE_PIN);
// set analog reference
analogReference(ADC_REF_POWER);
// initialize drive lines
init_row();
// initialize multiplexer select pin
init_mux_sel();
// set discharge pin to charge mode
setPinInput(DISCHARGE_PIN);
return 0;
}
// Read key value of key (row, col)
uint16_t ecsm_readkey_raw(uint8_t row, uint8_t col) {
uint16_t sw_value = 0;
discharge_capacitor();
select_mux(col);
clear_all_row_pins();
cli();
charge_capacitor(row);
sw_value = analogReadPin(ANALOG_PORT);
sei();
return sw_value;
}
// Update press/release state of key at (row, col)
bool ecsm_update_key(matrix_row_t* current_row, uint8_t col, uint16_t sw_value) {
bool current_state = (*current_row >> col) & 1;
// press to release
if (current_state && sw_value < config.low_threshold) {
*current_row &= ~(1 << col);
return true;
}
// release to press
if ((!current_state) && sw_value > config.high_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;
for (int col = 0; col < sizeof(col_channels); col++) {
for (int row = 0; row < sizeof(row_pins); row++) {
ecsm_sw_value[row][col] = ecsm_readkey_raw(row, col);
updated |= ecsm_update_key(¤t_matrix[row], col, ecsm_sw_value[row][col]);
}
}
return updated;
}
// Print key values
void ecsm_print_matrix(void) {
for (int row = 0; row < sizeof(row_pins); row++) {
for (int col = 0; col < sizeof(col_channels); col++) {
xprintf("%4d", ecsm_sw_value[row][col]);
}
xprintf("\n");
}
}
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