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/* Copyright 2023 Viktus Design LLC
*
* 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 "quantum.h"
#include "ec.h"
#include "analog.h"
//#include "debug.h" // needed for debugging
// sensing channel definitions
#define A0 0
#define A1 1
#define A2 2
#define A3 3
#define A4 4
#define A5 5
#define A6 6
#define A7 7
// analog connection settings
#define DISCHARGE_PIN D3
#define ANALOG_PORT D4
#ifndef MUX_SEL_PIN
# define MUX_SEL_PINS \
{ D0, D1, D2 }
#endif
// pin connections
const uint8_t row_channels[] = MATRIX_ROW_PINS;
const uint8_t col_pins[] = MATRIX_COL_PINS;
const uint8_t mux_sel_pins[] = MUX_SEL_PINS;
_Static_assert(sizeof(mux_sel_pins) == 3, "invalid MUX_SEL_PINS");
static ec_config_t config;
static uint16_t ec_sw_value[MATRIX_COLS][MATRIX_ROWS];
static inline void discharge_capacitor(void) { setPinOutput(DISCHARGE_PIN); }
static inline void charge_capacitor(uint8_t col) {
setPinInput(DISCHARGE_PIN);
writePinHigh(col_pins[col]);
}
static inline void clear_all_col_pins(void) {
for (int col = 0; col < sizeof(col_pins); col++) {
writePinLow(col_pins[col]);
}
}
void init_mux_sel(void) {
for (int idx = 0; idx < sizeof(mux_sel_pins); idx++) {
setPinOutput(mux_sel_pins[idx]);
}
}
void select_mux(uint8_t row) {
uint8_t ch = row_channels[row];
writePin(mux_sel_pins[0], ch & 1);
writePin(mux_sel_pins[1], ch & 2);
writePin(mux_sel_pins[2], ch & 4);
}
void init_col(void) {
for (int idx = 0; idx < sizeof(col_pins); idx++) {
setPinOutput(col_pins[idx]);
writePinLow(col_pins[idx]);
}
}
void ec_init(ec_config_t const* const ec_config) {
// save config
config = *ec_config;
// initialize discharge pin as discharge mode
writePinLow(DISCHARGE_PIN);
setPinOutput(DISCHARGE_PIN);
// set analog reference
analogReference(ADC_REF_POWER);
// initialize drive lines
init_col();
// initialize multiplexer select pin
init_mux_sel();
// set discharge pin to charge mode
setPinInput(DISCHARGE_PIN);
}
uint16_t ec_readkey_raw(uint8_t col, uint8_t row) {
uint16_t sw_value = 0;
discharge_capacitor();
select_mux(row);
clear_all_col_pins();
cli();
charge_capacitor(col);
sw_value = analogReadPin(ANALOG_PORT);
sei();
return sw_value;
}
bool ec_update_key(matrix_row_t* current_row, matrix_row_t col, uint16_t sw_value, uint16_t reset_pt, uint16_t actuation_pt) {
bool current_state = (*current_row >> col) & 1;
// press to release
if (current_state && sw_value < reset_pt) {
*current_row &= ~(MATRIX_ROW_SHIFTER << col);
return true;
}
// release to press
if ((!current_state) && sw_value > actuation_pt) {
*current_row |= (MATRIX_ROW_SHIFTER << col);
return true;
}
return false;
}
bool ec_matrix_scan(matrix_row_t current_matrix[]) {
bool updated = false;
for (int row = 0; row < sizeof(row_channels); row++) {
for (int col = 0; col < sizeof(col_pins); col++) {
uint16_t reset_pt = config.reset_pt;
uint16_t actuation_pt = config.actuation_pt;
//Modifying threshold values for overlapping pads
switch(row) {
case 0:
switch(col) {
case 14: // lower threshold for split backspace: left 1U( rest, btm)
case 15: // lower threshold for 2U backspace: 2U(38 rest, 60 btm)
reset_pt = 44;
actuation_pt = 48;
break;
}
break;
case 3:
switch(col) {
case 14: // Lower threshold for right shift: 1.75U(40 rest, 70 btm)
reset_pt = 48;
actuation_pt = 53;
break;
}
break;
case 4:
switch(col) {
case 3: // Lower threshold for left space: col3( rest, btm)
case 4: // Lower threshold for left space: col4(38 rest, 88 btm)
reset_pt = 50;
actuation_pt = 60;
break;
case 5: // Lower threshold for left space: col5( rest, btm)
case 6: // Lower threshold for left space: col6(40 rest, 80 btm)
reset_pt = 48;
actuation_pt = 58;
break;
case 14: // Lower threshold for right shift: 2.75U( rest, btm)
reset_pt = 48;
actuation_pt = 53;
break;
}
break;
}
ec_sw_value[col][row] = ec_readkey_raw(col, row);
updated |= ec_update_key(¤t_matrix[row], col, ec_sw_value[col][row], reset_pt, actuation_pt);
}
}
return updated;
}
// console debugging for pad values
/*void ec_dprint_matrix(void) {
for (int row = 0; row < sizeof(row_channels); row++) {
for (int col = 0; col < sizeof(col_pins); col++) {
dprintf("%5d", ec_sw_value[col][row]);
}
dprintf("\n");
}
}*/
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