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diff --git a/keyboards/viktus/osav2_numpad_topre/ec.c b/keyboards/viktus/osav2_numpad_topre/ec.c
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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 B5
+#define ANALOG_PORT B6
+
+#ifndef MUX_SEL_PIN
+# define MUX_SEL_PINS \
+ { D6, D7, B4 }
+#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;
+ }
+
+ // rest 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 1:
+ case 2:
+ case 3:
+ case 4:
+ switch(col) {
+ case 3: // lower threshold for plus and enter: (37 rest, 61 btm)
+ reset_pt = 45;
+ actuation_pt = 50;
+ break;
+ }
+ break;
+ }
+
+ ec_sw_value[col][row] = ec_readkey_raw(col, row);
+ updated |= ec_update_key(&current_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");
+ }
+}*/