/** @addtogroup gpio_defines * * @brief Access functions for the SAM3A/U/X I/O Controller * @ingroup SAM3_defines * LGPL License Terms @ref lgpl_license * @author @htmlonly © @endhtmlonly 2012 * Gareth McMullin * @author @htmlonly © @endhtmlonly 2014 * Felix Held * */ /* * This file is part of the libopencm3 project. * * Copyright (C) 2012 Gareth McMullin * Copyright (C) 2014 Felix Held * * 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 . */ #include /** @brief Initialize GPIO pins * * @param[in] port uint32_t: GPIO Port base address * @param[in] pin uint32_t * @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_ABSR(port) &= ~pins; PIO_PDR(port) = pins; break; case GPIO_FLAG_PERIPHB: PIO_ABSR(port) |= pins; PIO_PDR(port) = pins; } 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; } }