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https://github.com/qmk/qmk_firmware
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Add SN74x154 driver and convert AL1 custom matrix (#16331)
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Ryan
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5 changed files with 196 additions and 74 deletions
58
drivers/gpio/sn74x154.c
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58
drivers/gpio/sn74x154.c
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/* Copyright 2022
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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 "sn74x154.h"
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#include "gpio.h"
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#define ADDRESS_PIN_COUNT 4
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#ifndef SN74X154_ADDRESS_PINS
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# error sn74x154: no address pins defined!
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#endif
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static const pin_t address_pins[ADDRESS_PIN_COUNT] = SN74X154_ADDRESS_PINS;
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void sn74x154_init(void) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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setPinOutput(address_pins[i]);
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writePinLow(address_pins[i]);
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}
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#if defined(SN74X154_E0_PIN)
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setPinOutput(SN74X154_E0_PIN);
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writePinHigh(SN74X154_E0_PIN);
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#endif
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#if defined(SN74X154_E1_PIN)
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setPinOutput(SN74X154_E1_PIN);
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writePinHigh(SN74X154_E1_PIN);
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#endif
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}
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void sn74x154_set_enabled(bool enabled) {
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#if defined(SN74X154_E0_PIN)
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writePin(SN74X154_E0_PIN, !enabled);
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#endif
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#if defined(SN74X154_E1_PIN)
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writePin(SN74X154_E1_PIN, !enabled);
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#endif
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}
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void sn74x154_set_addr(uint8_t address) {
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for (int i = 0; i < ADDRESS_PIN_COUNT; i++) {
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writePin(address_pins[i], address & (1 << i));
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}
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}
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48
drivers/gpio/sn74x154.h
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48
drivers/gpio/sn74x154.h
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@ -0,0 +1,48 @@
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/* Copyright 2022
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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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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* Driver for 74x154 4-to-16 decoder/demultiplexer with inverting outputs
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* https://assets.nexperia.com/documents/data-sheet/74HC_HCT154.pdf
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*/
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/**
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* Initialize the address and output enable pins.
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*/
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void sn74x154_init(void);
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/**
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* Set the enabled state.
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*
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* When enabled is true, pulls the E0 and E1 pins low.
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*
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* \param enabled The enable state to set.
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*/
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void sn74x154_set_enabled(bool enabled);
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/**
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* Set the output pin address.
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*
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* The selected output pin will be pulled low, while the remaining output pins will be high.
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*
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* \param address The address to set, from 0 to 15.
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*/
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void sn74x154_set_addr(uint8_t address);
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@ -30,6 +30,11 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#define MATRIX_ROWS 6
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#define MATRIX_ROWS 6
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#define MATRIX_COLS 16
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#define MATRIX_COLS 16
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#define MATRIX_ROW_PINS { C7, B1, B2, C6, B4, B5 }
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#define SN74X154_ADDRESS_PINS { D4, D5, D6, D7 }
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#define SN74X154_E1_PIN D3
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#define LED_NUM_LOCK_PIN D0
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#define LED_NUM_LOCK_PIN D0
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#define LED_CAPS_LOCK_PIN B7
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#define LED_CAPS_LOCK_PIN B7
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#define LED_SCROLL_LOCK_PIN D1
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#define LED_SCROLL_LOCK_PIN D1
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@ -1,91 +1,101 @@
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/* Copyright 2022
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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 "matrix.h"
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#include "matrix.h"
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#include "gpio.h"
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#include "gpio.h"
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#include "sn74x154.h"
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static uint8_t read_rows(void) {
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static const pin_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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return (readPin(C7) ? 0 : 1) |
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(readPin(B1) ? 0 : 2) |
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(readPin(B2) ? 0 : 4) |
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(readPin(C6) ? 0 : 8) |
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(readPin(B4) ? 0 : 16) |
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(readPin(B5) ? 0 : 32);
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}
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/* All columns use a 74HC154 4-to-16 demultiplexer.
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* D3 is the enable pin, must be set high to use it.
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*
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* A3 A2 A1 A0
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* D7 D6 D5 D4
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* 0: 0 0 0 0
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* 1: 0 0 0 1
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* 2: 0 0 1 0
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* 3: 0 0 1 1
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* 4: 0 1 0 0
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* 5: 0 1 0 1
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* 6: 0 1 1 0
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* 7: 0 1 1 1
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* 8: 1 0 0 0
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* 9: 1 0 0 1
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* 10: 1 0 1 0
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* 11: 1 0 1 1
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* 12: 1 1 0 0
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* 13: 1 1 0 1
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* 14: 1 1 1 0
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* 15: 1 1 1 1
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*/
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static void select_col(uint8_t col) {
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static void select_col(uint8_t col) {
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writePinLow(D3);
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sn74x154_set_addr(col);
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writePin(D4, (col & 1));
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writePin(D5, (col & 2));
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writePin(D6, (col & 4));
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writePin(D7, (col & 8));
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}
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}
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static void unselect_cols(void) {
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static void init_pins(void) {
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writePinHigh(D3);
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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setPinInputHigh(row_pins[x]);
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}
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) {
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bool matrix_changed = false;
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// Select col and wait for col seleciton to stabilize
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select_col(current_col);
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matrix_io_delay();
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// For each row...
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for (uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row_index];
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// Check row pin state
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if (readPin(row_pins[row_index]) == 0) {
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// Pin LO, set col bit
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current_matrix[row_index] |= (MATRIX_ROW_SHIFTER << current_col);
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} else {
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~(MATRIX_ROW_SHIFTER << current_col);
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}
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// Determine if the matrix changed state
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if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) {
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matrix_changed = true;
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}
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}
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return matrix_changed;
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}
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}
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void matrix_init_custom(void) {
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void matrix_init_custom(void) {
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/* 74HC154 col pin configuration
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// initialize demultiplexer
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* pin: D3 D7 D6 D5 D4
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sn74x154_init();
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* row: off 0 x x x x
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sn74x154_set_enabled(true);
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* 0 1 0 0 0 0
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// initialize key pins
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* 1 1 0 0 0 1
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init_pins();
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* 2 1 0 0 1 0
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* 3 1 0 0 1 1
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* 4 1 0 1 0 0
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* 5 1 0 1 0 1
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* 6 1 0 1 1 0
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* 7 1 0 1 1 1
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* 8 1 1 0 0 0
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* 9 1 1 0 0 1
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* 10 1 1 0 1 0
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* 11 1 1 0 1 1
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* 12 1 1 1 0 0
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* 13 1 1 1 0 1
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* 14 1 1 1 1 0
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* 15 1 1 1 1 1
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*/
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setPinOutput(D3);
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writePinHigh(D3);
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setPinOutput(D4);
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setPinOutput(D5);
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setPinOutput(D6);
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setPinOutput(D7);
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/* Row pin configuration
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*
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* row: 0 1 2 3 4 5
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* pin: C7 B1 B2 C6 B4 B5
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*
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*/
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setPinInputHigh(C7);
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setPinInputHigh(B1);
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setPinInputHigh(B2);
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setPinInputHigh(C6);
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setPinInputHigh(B4);
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setPinInputHigh(B5);
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}
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool changed = false;
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bool changed = false;
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for (uint8_t col = 0; col < MATRIX_COLS; col++) {
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// Set col, read rows
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select_col(col);
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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matrix_io_delay();
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changed |= read_rows_on_col(current_matrix, current_col);
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uint8_t rows = read_rows();
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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bool prev_bit = current_matrix[row] & ((matrix_row_t)1 << col);
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bool curr_bit = rows & (1 << row);
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if (prev_bit != curr_bit) {
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current_matrix[row] ^= ((matrix_row_t)1 << col);
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changed = true;
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}
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}
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unselect_cols();
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}
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}
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return changed;
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return changed;
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@ -18,4 +18,5 @@ RGBLIGHT_ENABLE = no # Enable keyboard RGB underglow
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AUDIO_ENABLE = no # Audio output
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AUDIO_ENABLE = no # Audio output
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CUSTOM_MATRIX = lite
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CUSTOM_MATRIX = lite
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SRC += matrix.c
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VPATH += drivers/gpio
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SRC += matrix.c sn74x154.c
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