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Add SN74x154 driver and convert AL1 custom matrix (#16331)

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Ryan 2022-03-15 11:38:53 +11:00 • committed by GitHub
parent 588abd24b5
commit 2d9c3f9a89
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5 changed files with 196 additions and 74 deletions
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58
drivers/gpio/sn74x154.c Normal file
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/* 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));
}
}

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drivers/gpio/sn74x154.h Normal file
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/* 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);