gpio_common_3n3s.c

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/** @addtogroup gpio_defines
 *
 * @brief <b>Access functions for the SAM3N/S I/O Controller</b>
 * @ingroup SAM3_defines
 * LGPL License Terms @ref lgpl_license
 * @author @htmlonly &copy; @endhtmlonly 2012
 * Gareth McMullin <gareth@blacksphere.co.nz>
 * @author @htmlonly &copy; @endhtmlonly 2014
 * Felix Held <felix-libopencm3@felixheld.de>
 *
 */
 
/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2012 Gareth McMullin <gareth@blacksphere.co.nz>
 * Copyright (C) 2014 Felix Held <felix-libopencm3@felixheld.de>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <libopencm3/sam/gpio.h>
 
 
/** @brief Initialize GPIO pins
 *
 * @param[in] port uint32_t: GPIO Port base address
 * @param[in] pins uint32_t bitfield of pins to initialize
 * @param[in] flags enum gpio_flags
 */
void gpio_init(uint32_t port, uint32_t pins, enum gpio_flags flags)
{
        switch (flags & 0x7) {
        case GPIO_FLAG_GPINPUT:
                PIO_ODR(port) = pins;
                PIO_PER(port) = pins;
                break;
        case GPIO_FLAG_GPOUTPUT:
                PIO_OER(port) = pins;
                PIO_PER(port) = pins;
                break;
        case GPIO_FLAG_PERIPHA:
                PIO_ABCDSR1(port) &= ~pins;
                PIO_ABCDSR2(port) &= ~pins;
                PIO_PDR(port) = pins;
                break;
        case GPIO_FLAG_PERIPHB:
                PIO_ABCDSR1(port) |= pins;
                PIO_ABCDSR2(port) &= ~pins;
                PIO_PDR(port) = pins;
                break;
        case GPIO_FLAG_PERIPHC:
                PIO_ABCDSR1(port) &= ~pins;
                PIO_ABCDSR2(port) |= pins;
                PIO_PDR(port) = pins;
                break;
        case GPIO_FLAG_PERIPHD:
                PIO_ABCDSR1(port) |= pins;
                PIO_ABCDSR2(port) |= pins;
                PIO_PDR(port) = pins;
                break;
        }
 
        if (flags & GPIO_FLAG_OPEN_DRAIN) {
                PIO_MDER(port) = pins;
        } else {
                PIO_MDDR(port) = pins;
        }
 
        if (flags & GPIO_FLAG_PULL_UP) {
                PIO_PUER(port) = pins;
        } else {
                PIO_PUDR(port) = pins;
        }
}