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181 lines
4.7 KiB
181 lines
4.7 KiB
/* Copyright 2023 Viktus Design LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "quantum.h"
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#include "ec.h"
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#include "analog.h"
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//#include "debug.h" // needed for debugging
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// sensing channel definitions
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#define A0 0
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#define A1 1
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#define A2 2
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#define A3 3
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#define A4 4
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#define A5 5
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#define A6 6
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#define A7 7
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// analog connection settings
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#define DISCHARGE_PIN B5
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#define ANALOG_PORT B6
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#ifndef MUX_SEL_PIN
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# define MUX_SEL_PINS \
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{ D6, D7, B4 }
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#endif
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// pin connections
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const uint8_t row_channels[] = MATRIX_ROW_PINS;
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const uint8_t col_pins[] = MATRIX_COL_PINS;
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const uint8_t mux_sel_pins[] = MUX_SEL_PINS;
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_Static_assert(sizeof(mux_sel_pins) == 3, "invalid MUX_SEL_PINS");
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static ec_config_t config;
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static uint16_t ec_sw_value[MATRIX_COLS][MATRIX_ROWS];
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static inline void discharge_capacitor(void) { gpio_set_pin_output(DISCHARGE_PIN); }
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static inline void charge_capacitor(uint8_t col) {
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gpio_set_pin_input(DISCHARGE_PIN);
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gpio_write_pin_high(col_pins[col]);
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}
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static inline void clear_all_col_pins(void) {
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for (int col = 0; col < sizeof(col_pins); col++) {
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gpio_write_pin_low(col_pins[col]);
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}
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}
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void init_mux_sel(void) {
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for (int idx = 0; idx < sizeof(mux_sel_pins); idx++) {
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gpio_set_pin_output(mux_sel_pins[idx]);
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}
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}
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void select_mux(uint8_t row) {
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uint8_t ch = row_channels[row];
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gpio_write_pin(mux_sel_pins[0], ch & 1);
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gpio_write_pin(mux_sel_pins[1], ch & 2);
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gpio_write_pin(mux_sel_pins[2], ch & 4);
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}
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void init_col(void) {
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for (int idx = 0; idx < sizeof(col_pins); idx++) {
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gpio_set_pin_output(col_pins[idx]);
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gpio_write_pin_low(col_pins[idx]);
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}
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}
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void ec_init(ec_config_t const* const ec_config) {
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// save config
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config = *ec_config;
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// initialize discharge pin as discharge mode
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gpio_write_pin_low(DISCHARGE_PIN);
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gpio_set_pin_output(DISCHARGE_PIN);
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// set analog reference
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analogReference(ADC_REF_POWER);
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// initialize drive lines
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init_col();
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// initialize multiplexer select pin
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init_mux_sel();
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// set discharge pin to charge mode
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gpio_set_pin_input(DISCHARGE_PIN);
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}
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uint16_t ec_readkey_raw(uint8_t col, uint8_t row) {
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uint16_t sw_value = 0;
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discharge_capacitor();
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select_mux(row);
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clear_all_col_pins();
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cli();
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charge_capacitor(col);
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sw_value = analogReadPin(ANALOG_PORT);
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sei();
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return sw_value;
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}
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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) {
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bool current_state = (*current_row >> col) & 1;
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// press to release
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if (current_state && sw_value < reset_pt) {
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*current_row &= ~(MATRIX_ROW_SHIFTER << col);
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return true;
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}
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// rest to press
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if ((!current_state) && sw_value > actuation_pt) {
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*current_row |= (MATRIX_ROW_SHIFTER << col);
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return true;
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}
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return false;
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}
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bool ec_matrix_scan(matrix_row_t current_matrix[]) {
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bool updated = false;
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for (int row = 0; row < sizeof(row_channels); row++) {
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for (int col = 0; col < sizeof(col_pins); col++) {
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uint16_t reset_pt = config.reset_pt;
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uint16_t actuation_pt = config.actuation_pt;
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//Modifying threshold values for overlapping pads
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switch(row) {
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case 1:
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case 2:
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case 3:
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case 4:
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switch(col) {
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case 3: // lower threshold for plus and enter: (37 rest, 61 btm)
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reset_pt = 45;
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actuation_pt = 50;
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break;
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}
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break;
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}
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ec_sw_value[col][row] = ec_readkey_raw(col, row);
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updated |= ec_update_key(¤t_matrix[row], col, ec_sw_value[col][row], reset_pt, actuation_pt);
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}
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}
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return updated;
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}
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// console debugging for pad values
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/*void ec_dprint_matrix(void) {
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for (int row = 0; row < sizeof(row_channels); row++) {
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for (int col = 0; col < sizeof(col_pins); col++) {
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dprintf("%5d", ec_sw_value[col][row]);
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}
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dprintf("\n");
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}
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}*/
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