text: /****************************************************************************
   * boards/arm/lpc17xx_40xx/lpc4088-quickstart/src/lpc17_40_ssp.c
   * arch/arm/src/board/lpc17_40_ssp.c
   *
   *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * 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. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS 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.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdint.h>
  #include <stdbool.h>
  #include <debug.h>
  
  #include <nuttx/spi/spi.h>
  
  #include <arch/board/board.h>
  
  #include "up_arch.h"
  #include "chip.h"
  #include "lpc17_40_gpio.h"
  #include "lpc17_40_ssp.h"
  #include "lpc4088-quickstart.h"
  
  #if defined(CONFIG_LPC17_40_SSP0) || defined(CONFIG_LPC17_40_SSP1) || \
      defined(CONFIG_LPC17_40_SSP2)
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /* Dump GPIO registers */
  
  #ifdef CONFIG_DEBUG_GPIO_INFO
  #  define ssp_dumpgpio(p,m) lpc17_40_dumpgpio(p,m)
  #else
  #  define ssp_dumpgpio(p,m)
  #endif
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: lpc4088_quickstart_sspdev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the LPC1766-STK.
   *
   ****************************************************************************/
  
  void weak_function lpc4088_quickstart_sspdev_initialize(void)
  {
    /* Configure the SSP0 chip select GPIOs. */
  
  #ifdef CONFIG_LPC17_40_SSP0
  #endif
  
    /* Configure SSP1 chip select GPIOs.  This includes the touchscreen on the
     * the LCD module.
     */
  
  #ifdef CONFIG_LPC17_40_SSP1
    ssp_dumpgpio(GPIO_TC_CS, "BEFORE SSP1 Initialization");
    lpc17_40_configgpio(GPIO_TC_CS);
    ssp_dumpgpio(GPIO_TC_CS, "AFTER SSP1 Initialization");
  #endif
  
    /* Configure the SSP2 chip select GPIOs. */
  
  #ifdef CONFIG_LPC17_40_SSP2
  #endif
  }
  
  /****************************************************************************
   * Name:  lpc17_40_ssp0/1/2select and lpc17_40_ssp0/1/2status
   *
   * Description:
   *   The external functions, lpc17_40_ssp0/1/2select and
   *   lpc17_40_ssp0/1/2status must be provided by board-specific logic.
   *   They are implementations of the select and status methods of the SPI
   *   interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
   *   All other methods (including lpc17_40_sspbus_initialize())
   *   are provided by common LPC17xx/LPC40xx logic.
   *   To use this common SPI logic on your board:
   *
   *   1. Provide logic in lpc17_40_boardinitialize() to configure SPI/SSP
   *      chip select pins.
   *   2. Provide lpc17_40_ssp0/1/2select() and lpc17_40_ssp0/1/2status()
   *      functions in your board-specific logic.
   *      These functions will perform chip selection and status operations
   *      using GPIOs in the way your board is configured.
   *   3. Add a calls to lpc17_40_sspbus_initialize() in your low level
   *      application initialization logic
   *   4. The handle returned by lpc17_40_sspbus_initialize() may then be
   *      used to bind the SPI driver to higher level logic (e.g., calling
   *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
   *      the SPI MMC/SD driver).
   *
   ****************************************************************************/
  
  #ifdef CONFIG_LPC17_40_SSP0
  void  lpc17_40_ssp0select(FAR struct spi_dev_s *dev, uint32_t devid,
                            bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
  }
  
  uint8_t lpc17_40_ssp0status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    spiinfo("Returning nothing\n");
    return 0;
  }
  #endif
  
  #ifdef CONFIG_LPC17_40_SSP1
  void  lpc17_40_ssp1select(FAR struct spi_dev_s *dev, uint32_t devid,
                            bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
  }
  
  uint8_t lpc17_40_ssp1status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    spiinfo("Returning nothing\n");
    return 0;
  }
  #endif
  
  #ifdef CONFIG_LPC17_40_SSP2
  void  lpc17_40_ssp2select(FAR struct spi_dev_s *dev, uint32_t devid,
                            bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
  }
  
  uint8_t lpc17_40_ssp2status(FAR struct spi_dev_s *dev, uint32_t devid)
  {
    spiinfo("Returning nothing\n");
    return 0;
  }
  #endif
  
  #endif /* CONFIG_LPC17_40_SSP0 || CONFIG_LPC17_40_SSP1  || CONFIG_LPC17_40_SSP2 */
  