From 2d9c3f9a89c502e76eacb485e984ba467d72048e Mon Sep 17 00:00:00 2001 From: Ryan Date: Tue, 15 Mar 2022 11:38:53 +1100 Subject: Add SN74x154 driver and convert AL1 custom matrix (#16331) --- drivers/gpio/sn74x154.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 drivers/gpio/sn74x154.h (limited to 'drivers/gpio/sn74x154.h') 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 . + */ + +#pragma once + +#include +#include + +/** + * 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); -- cgit v1.2.3