text: /**
   * \file
   *
   * \brief SAM D20 GPIO Port Driver
   *
   * Copyright (C) 2012-2013 Atmel Corporation. All rights reserved.
   *
   * \asf_license_start
   *
   * \page License
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * 3. The name of Atmel may not be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * 4. This software may only be redistributed and used in connection with an
   *    Atmel microcontroller product.
   *
   * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
   * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * \asf_license_stop
   *
   */
  #include <port.h>
  
  /**
   *  \brief Writes a Port pin configuration to the hardware module.
   *
   *  Writes out a given configuration of a Port pin configuration to the hardware
   *  module.
   *
   *  \note If the pin direction is set as an output, the pull-up/pull-down input
   *        configuration setting is ignored.
   *
   *  \param[in] gpio_pin  Index of the GPIO pin to configure.
   *  \param[in] config    Configuration settings for the pin.
   */
  void port_pin_set_config(
  		const uint8_t gpio_pin,
  		const struct port_config *const config)
  {
  	/* Sanity check arguments */
  	Assert(config);
  
  	struct system_pinmux_config pinmux_config;
  	system_pinmux_get_config_defaults(&pinmux_config);
  
  	pinmux_config.mux_position = SYSTEM_PINMUX_GPIO;
  	pinmux_config.direction    = (enum system_pinmux_pin_dir)config->direction;
  	pinmux_config.input_pull   = (enum system_pinmux_pin_pull)config->input_pull;
  
  	system_pinmux_pin_set_config(gpio_pin, &pinmux_config);
  }
  
  /**
   *  \brief Writes a Port group configuration group to the hardware module.
   *
   *  Writes out a given configuration of a Port group configuration to the
   *  hardware module.
   *
   *  \note If the pin direction is set as an output, the pull-up/pull-down input
   *        configuration setting is ignored.
   *
   *  \param[out] port    Base of the PORT module to write to.
   *  \param[in]  mask    Mask of the port pin(s) to configure.
   *  \param[in]  config  Configuration settings for the pin group.
   */
  void port_group_set_config(
  		PortGroup *const port,
  		const uint32_t mask,
  		const struct port_config *const config)
  {
  	/* Sanity check arguments */
  	Assert(port);
  	Assert(config);
  
  	struct system_pinmux_config pinmux_config;
  	system_pinmux_get_config_defaults(&pinmux_config);
  
  	pinmux_config.mux_position = SYSTEM_PINMUX_GPIO;
  	pinmux_config.direction    = (enum system_pinmux_pin_dir)config->direction;
  	pinmux_config.input_pull   = (enum system_pinmux_pin_pull)config->input_pull;
  
  	system_pinmux_group_set_config(port, mask, &pinmux_config);
  }
  