1 files changed, 191 insertions, 0 deletions
diff --git a/keyboards/viktus/styrka_topre/ec.c b/keyboards/viktus/styrka_topre/ec.c
new file mode 100644
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+++ b/keyboards/viktus/styrka_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 "ec.h"
+
+#include "quantum.h"
+#include "analog.h"
+//#include "debug.h"
+
+// 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;
+
+            switch(row) {
+                case 0:
+                    switch(col) {
+                        case 15: // lower threshold for split backspace:
+                        case 16: // lower threshold for 2U backspace: 2U(37 rest, 62 btm)
+                            reset_pt = 45;
+                            actuation_pt = 50;
+                            break;
+                    }
+                    break;
+                case 4:
+                    switch(col) {
+                        case 8: // Lower threshold for spacebar: 7U(37 rest, 63 btm)
+                            reset_pt = 55;
+                            actuation_pt = 60;
+                            break;
+                        case 13: // Lower threshold for right bottom mods: 1.5U(40 rest, 65 btm)
+                            reset_pt = 47;
+                            actuation_pt = 53;
+                            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");
+    }
+}*/