You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
151 lines
3.9 KiB
151 lines
3.9 KiB
/* 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");
|
|
}
|
|
}
|