74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
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/** @addtogroup gpio_defines
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*
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* @brief <b>Access functions for the SAM3A/U/X I/O Controller</b>
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* @ingroup SAM3_defines
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* LGPL License Terms @ref lgpl_license
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* @author @htmlonly © @endhtmlonly 2012
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* Gareth McMullin <gareth@blacksphere.co.nz>
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* @author @htmlonly © @endhtmlonly 2014
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* Felix Held <felix-libopencm3@felixheld.de>
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*
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Gareth McMullin <gareth@blacksphere.co.nz>
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* Copyright (C) 2014 Felix Held <felix-libopencm3@felixheld.de>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/sam/gpio.h>
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/** @brief Initialize GPIO pins
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*
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* @param[in] port uint32_t: GPIO Port base address
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* @param[in] pins uint32_t bitfield of pins to initialize
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* @param[in] flags enum gpio_flags
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*/
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void gpio_init(uint32_t port, uint32_t pins, enum gpio_flags flags)
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{
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switch (flags & 0x7) {
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case GPIO_FLAG_GPINPUT:
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PIO_ODR(port) = pins;
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PIO_PER(port) = pins;
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break;
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case GPIO_FLAG_GPOUTPUT:
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PIO_OER(port) = pins;
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PIO_PER(port) = pins;
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break;
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case GPIO_FLAG_PERIPHA:
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PIO_ABSR(port) &= ~pins;
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PIO_PDR(port) = pins;
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break;
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case GPIO_FLAG_PERIPHB:
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PIO_ABSR(port) |= pins;
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PIO_PDR(port) = pins;
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}
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if (flags & GPIO_FLAG_OPEN_DRAIN) {
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PIO_MDER(port) = pins;
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} else {
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PIO_MDDR(port) = pins;
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}
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if (flags & GPIO_FLAG_PULL_UP) {
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PIO_PUER(port) = pins;
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} else {
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PIO_PUDR(port) = pins;
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}
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}
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