diff options
| -rw-r--r-- | drivers/gpio/sn74x154.c | 58 | ||||
| -rw-r--r-- | drivers/gpio/sn74x154.h | 48 | ||||
| -rw-r--r-- | keyboards/al1/config.h | 5 | ||||
| -rw-r--r-- | keyboards/al1/matrix.c | 152 | ||||
| -rw-r--r-- | keyboards/al1/rules.mk | 3 |
5 files changed, 194 insertions, 72 deletions
diff --git a/drivers/gpio/sn74x154.c b/drivers/gpio/sn74x154.c new file mode 100644 index 0000000000..5f21f12b55 --- /dev/null +++ b/drivers/gpio/sn74x154.c @@ -0,0 +1,58 @@ +/* Copyright 2022 + * + * 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 "sn74x154.h" +#include "gpio.h" + +#define ADDRESS_PIN_COUNT 4 + +#ifndef SN74X154_ADDRESS_PINS +# error sn74x154: no address pins defined! +#endif + +static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X154_ADDRESS_PINS; + +void sn74x154_init(void) { + for (int i = 0; i < ADDRESS_PIN_COUNT; i++) { + setPinOutput(address_pins[i]); + writePinLow(address_pins[i]); + } + +#if defined(SN74X154_E0_PIN) + setPinOutput(SN74X154_E0_PIN); + writePinHigh(SN74X154_E0_PIN); +#endif + +#if defined(SN74X154_E1_PIN) + setPinOutput(SN74X154_E1_PIN); + writePinHigh(SN74X154_E1_PIN); +#endif +} + +void sn74x154_set_enabled(bool enabled) { +#if defined(SN74X154_E0_PIN) + writePin(SN74X154_E0_PIN, !enabled); +#endif +#if defined(SN74X154_E1_PIN) + writePin(SN74X154_E1_PIN, !enabled); +#endif +} + +void sn74x154_set_addr(uint8_t address) { + for (int i = 0; i < ADDRESS_PIN_COUNT; i++) { + writePin(address_pins[i], address & (1 << i)); + } +} diff --git a/drivers/gpio/sn74x154.h b/drivers/gpio/sn74x154.h new file mode 100644 index 0000000000..ce6a9ddb0e --- /dev/null +++ b/drivers/gpio/sn74x154.h @@ -0,0 +1,48 @@ +/* Copyright 2022 + * + * 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/>. + */ + +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +/** + * Driver for 74x154 4-to-16 decoder/demultiplexer with inverting outputs + * https://assets.nexperia.com/documents/data-sheet/74HC_HCT154.pdf + */ + +/** + * Initialize the address and output enable pins. + */ +void sn74x154_init(void); + +/** + * Set the enabled state. + * + * When enabled is true, pulls the E0 and E1 pins low. + * + * \param enabled The enable state to set. + */ +void sn74x154_set_enabled(bool enabled); + +/** + * Set the output pin address. + * + * The selected output pin will be pulled low, while the remaining output pins will be high. + * + * \param address The address to set, from 0 to 15. + */ +void sn74x154_set_addr(uint8_t address); diff --git a/keyboards/al1/config.h b/keyboards/al1/config.h index c8edb8ebfe..570eb03ae2 100644 --- a/keyboards/al1/config.h +++ b/keyboards/al1/config.h @@ -30,6 +30,11 @@ along with this program. If not, see <http://www.gnu.org/licenses/>. #define MATRIX_ROWS 6 #define MATRIX_COLS 16 +#define MATRIX_ROW_PINS { C7, B1, B2, C6, B4, B5 } + +#define SN74X154_ADDRESS_PINS { D4, D5, D6, D7 } +#define SN74X154_E1_PIN D3 + #define LED_NUM_LOCK_PIN D0 #define LED_CAPS_LOCK_PIN B7 #define LED_SCROLL_LOCK_PIN D1 diff --git a/keyboards/al1/matrix.c b/keyboards/al1/matrix.c index 1407cbc089..e3d7971f1c 100644 --- a/keyboards/al1/matrix.c +++ b/keyboards/al1/matrix.c @@ -1,91 +1,101 @@ -#include "matrix.h" +/* Copyright 2022 + * + * 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 "matrix.h" #include "gpio.h" +#include "sn74x154.h" -static uint8_t read_rows(void) { - return (readPin(C7) ? 0 : 1) | - (readPin(B1) ? 0 : 2) | - (readPin(B2) ? 0 : 4) | - (readPin(C6) ? 0 : 8) | - (readPin(B4) ? 0 : 16) | - (readPin(B5) ? 0 : 32); -} +static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; +/* All columns use a 74HC154 4-to-16 demultiplexer. + * D3 is the enable pin, must be set high to use it. + * + * A3 A2 A1 A0 + * D7 D6 D5 D4 + * 0: 0 0 0 0 + * 1: 0 0 0 1 + * 2: 0 0 1 0 + * 3: 0 0 1 1 + * 4: 0 1 0 0 + * 5: 0 1 0 1 + * 6: 0 1 1 0 + * 7: 0 1 1 1 + * 8: 1 0 0 0 + * 9: 1 0 0 1 + * 10: 1 0 1 0 + * 11: 1 0 1 1 + * 12: 1 1 0 0 + * 13: 1 1 0 1 + * 14: 1 1 1 0 + * 15: 1 1 1 1 + */ static void select_col(uint8_t col) { - writePinLow(D3); - - writePin(D4, (col & 1)); - writePin(D5, (col & 2)); - writePin(D6, (col & 4)); - writePin(D7, (col & 8)); + sn74x154_set_addr(col); } -static void unselect_cols(void) { - writePinHigh(D3); +static void init_pins(void) { + for (uint8_t x = 0; x < MATRIX_ROWS; x++) { + setPinInputHigh(row_pins[x]); + } } -void matrix_init_custom(void) { - /* 74HC154 col pin configuration - * pin: D3 D7 D6 D5 D4 - * row: off 0 x x x x - * 0 1 0 0 0 0 - * 1 1 0 0 0 1 - * 2 1 0 0 1 0 - * 3 1 0 0 1 1 - * 4 1 0 1 0 0 - * 5 1 0 1 0 1 - * 6 1 0 1 1 0 - * 7 1 0 1 1 1 - * 8 1 1 0 0 0 - * 9 1 1 0 0 1 - * 10 1 1 0 1 0 - * 11 1 1 0 1 1 - * 12 1 1 1 0 0 - * 13 1 1 1 0 1 - * 14 1 1 1 1 0 - * 15 1 1 1 1 1 - */ - setPinOutput(D3); - writePinHigh(D3); +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) { + bool matrix_changed = false; + + // Select col and wait for col seleciton to stabilize + select_col(current_col); + matrix_io_delay(); - setPinOutput(D4); - setPinOutput(D5); - setPinOutput(D6); - setPinOutput(D7); + // For each row... + for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) { + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[row_index]; + // Check row pin state + if (readPin(row_pins[row_index]) == 0) { + // Pin LO, set col bit + current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col); + } else { + // Pin HI, clear col bit + current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col); + } - /* Row pin configuration - * - * row: 0 1 2 3 4 5 - * pin: C7 B1 B2 C6 B4 B5 - * - */ - setPinInputHigh(C7); - setPinInputHigh(B1); - setPinInputHigh(B2); - setPinInputHigh(C6); - setPinInputHigh(B4); - setPinInputHigh(B5); + // Determine if the matrix changed state + if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) { + matrix_changed = true; + } + } + + return matrix_changed; +} + +void matrix_init_custom(void) { + // initialize demultiplexer + sn74x154_init(); + sn74x154_set_enabled(true); + // initialize key pins + init_pins(); } bool matrix_scan_custom(matrix_row_t current_matrix[]) { bool changed = false; - for (uint8_t col = 0; col < MATRIX_COLS; col++) { - select_col(col); - matrix_io_delay(); - uint8_t rows = read_rows(); - - for (uint8_t row = 0; row < MATRIX_ROWS; row++) { - bool prev_bit = current_matrix[row] & ((matrix_row_t)1 << col); - bool curr_bit = rows & (1 << row); - - if (prev_bit != curr_bit) { - current_matrix[row] ^= ((matrix_row_t)1 << col); - changed = true; - } - } - unselect_cols(); + // Set col, read rows + for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { + changed |= read_rows_on_col(current_matrix, current_col); } return changed; diff --git a/keyboards/al1/rules.mk b/keyboards/al1/rules.mk index 670712f661..1f8e81de20 100644 --- a/keyboards/al1/rules.mk +++ b/keyboards/al1/rules.mk @@ -18,4 +18,5 @@ RGBLIGHT_ENABLE = no # Enable keyboard RGB underglow AUDIO_ENABLE = no # Audio output CUSTOM_MATRIX = lite -SRC += matrix.c +VPATH += drivers/gpio +SRC += matrix.c sn74x154.c |