diff options
Diffstat (limited to 'keyboards/cipulot/rf_r1_8_9xu/ec_switch_matrix.c')
| -rw-r--r-- | keyboards/cipulot/rf_r1_8_9xu/ec_switch_matrix.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/keyboards/cipulot/rf_r1_8_9xu/ec_switch_matrix.c b/keyboards/cipulot/rf_r1_8_9xu/ec_switch_matrix.c new file mode 100644 index 0000000000..3f25e365c0 --- /dev/null +++ b/keyboards/cipulot/rf_r1_8_9xu/ec_switch_matrix.c @@ -0,0 +1,183 @@ +/* Copyright 2023 Cipulot + * + * 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 "analog.h" +#include "atomic_util.h" +#include "print.h" +#include "wait.h" + +/* Pin and port array */ +const uint32_t row_pins[] = MATRIX_ROW_PINS; +const uint8_t col_channels[] = MATRIX_COL_CHANNELS; +const uint32_t mux_sel_pins[] = MUX_SEL_PINS; + +static ecsm_config_t config; +static uint16_t ecsm_sw_value[MATRIX_ROWS][MATRIX_COLS]; + +static adc_mux adcMux; + +static inline void discharge_capacitor(void) { + writePinLow(DISCHARGE_PIN); +} +static inline void charge_capacitor(uint8_t row) { + writePinHigh(DISCHARGE_PIN); + writePinHigh(row_pins[row]); +} + +static inline void init_mux_sel(void) { + for (int idx = 0; idx < 3; 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 < MATRIX_ROWS; idx++) { + setPinOutput(row_pins[idx]); + writePinLow(row_pins[idx]); + } +} + +/* Initialize the peripherals pins */ +int ecsm_init(ecsm_config_t const* const ecsm_config) { + // Initialize config + config = *ecsm_config; + + palSetLineMode(ANALOG_PORT, PAL_MODE_INPUT_ANALOG); + adcMux = pinToMux(ANALOG_PORT); + + //Dummy call to make sure that adcStart() has been called in the appropriate state + adc_read(adcMux); + + // Initialize discharge pin as discharge mode + writePinLow(DISCHARGE_PIN); + setPinOutputOpenDrain(DISCHARGE_PIN); + + // Initialize drive lines + init_row(); + + // Initialize multiplexer select pin + init_mux_sel(); + + // Enable AMUX + setPinOutput(APLEX_EN_PIN_0); + writePinLow(APLEX_EN_PIN_0); + setPinOutput(APLEX_EN_PIN_1); + writePinLow(APLEX_EN_PIN_1); + + return 0; +} + +int ecsm_update(ecsm_config_t const* const ecsm_config) { + // Save config + config = *ecsm_config; + return 0; +} + +// Read the capacitive sensor value +uint16_t ecsm_readkey_raw(uint8_t channel, uint8_t row, uint8_t col) { + uint16_t sw_value = 0; + + // Select the multiplexer + if (channel == 0) { + writePinHigh(APLEX_EN_PIN_0); + select_mux(col); + writePinLow(APLEX_EN_PIN_0); + } else { + writePinHigh(APLEX_EN_PIN_1); + select_mux(col); + writePinLow(APLEX_EN_PIN_1); + } + + // Set strobe pins to low state + writePinLow(row_pins[row]); + ATOMIC_BLOCK_FORCEON { + // Set the row pin to high state and have capacitor charge + charge_capacitor(row); + // Read the ADC value + sw_value = adc_read(adcMux); + } + // Discharge peak hold capacitor + discharge_capacitor(); + // Waiting for the ghost capacitor to discharge fully + wait_us(DISCHARGE_TIME); + + return sw_value; +} + +// Update press/release state of key +bool ecsm_update_key(matrix_row_t* current_row, uint8_t row, uint8_t col, uint16_t sw_value) { + bool current_state = (*current_row >> col) & 1; + + // Press to release + if (current_state && sw_value < config.ecsm_actuation_threshold) { + *current_row &= ~(1 << col); + return true; + } + + // Release to press + if ((!current_state) && sw_value > config.ecsm_release_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; + + // Disable AMUX of channel 1 + writePinHigh(APLEX_EN_PIN_1); + for (int col = 0; col < sizeof(col_channels); col++) { + for (int row = 0; row < MATRIX_ROWS; row++) { + ecsm_sw_value[row][col] = ecsm_readkey_raw(0, row, col); + updated |= ecsm_update_key(¤t_matrix[row], row, col, ecsm_sw_value[row][col]); + } + } + + // Disable AMUX of channel 1 + writePinHigh(APLEX_EN_PIN_0); + for (int col = 0; col < sizeof(col_channels); col++) { + for (int row = 0; row < MATRIX_ROWS; row++) { + ecsm_sw_value[row][col + 8] = ecsm_readkey_raw(1, row, col); + updated |= ecsm_update_key(¤t_matrix[row], row, col + 8, ecsm_sw_value[row][col + 8]); + } + } + return updated; +} + +// Debug print key values +void ecsm_print_matrix(void) { + for (int row = 0; row < MATRIX_ROWS; row++) { + for (int col = 0; col < MATRIX_COLS; col++) { + uprintf("%4d", ecsm_sw_value[row][col]); + if (col < (MATRIX_COLS - 1)) { + print(","); + } + } + print("\n"); + } + print("\n"); +} |