nuttx/configs/sam3u-ek/src/up_spi.c

/************************************************************************************
 * configs/sam3u-ek/src/up_spi.c
 * arch/arm/src/board/up_spi.c
 *
 *   Copyright (C) 2009, 2011 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.h>
#include <arch/board/board.h>

#include "up_arch.h"
#include "chip.h"
#include "sam3u_internal.h"
#include "sam3uek_internal.h"

#ifdef CONFIG_SAM3U_SPI

/************************************************************************************
 * Definitions
 ************************************************************************************/

/* Enables debug output from this file (needs CONFIG_DEBUG too) */

#undef SPI_DEBUG   /* Define to enable debug */
#undef SPI_VERBOSE /* Define to enable verbose debug */

#ifdef SPI_DEBUG
#  define spidbg  lldbg
#  ifdef SPI_VERBOSE
#    define spivdbg lldbg
#  else
#    define spivdbg(x...)
#  endif
#else
#  undef SPI_VERBOSE
#  define spidbg(x...)
#  define spivdbg(x...)
#endif

/************************************************************************************
 * Private Functions
 ************************************************************************************/

/************************************************************************************
 * Public Functions
 ************************************************************************************/

/************************************************************************************
 * Name: sam3u_spiinitialize
 *
 * Description:
 *   Called to configure SPI chip select GPIO pins for the SAM3U10E-EVAL board.
 *
 ************************************************************************************/

void weak_function sam3u_spiinitialize(void)
{
  /* The ZigBee module connects used NPCS0.  However, there is not yet any
   * ZigBee support.
   */

   /* The touchscreen connects using NPCS2 (PC14). */

#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
   sam3u_configgpio(GPIO_TSC_NPCS2);
#endif
}

/****************************************************************************
 * Name:  sam3u_spiselect, sam3u_spistatus, and sam3u_spicmddata
 *
 * Description:
 *   These external functions must be provided by board-specific logic.  They
 *   are implementations of the select, status, and cmddata methods of the SPI
 *   interface defined by struct spi_ops_s (see include/nuttx/spi.h). All
 *   other methods including up_spiinitialize()) are provided by common SAM3U
 *   logic.  To use this common SPI logic on your board:
 *
 *   1. Provide logic in sam3u_boardinitialize() to configure SPI chip select
 *      pins.
 *   2. Provide sam3u_spiselect() and sam3u_spistatus() functions in your
 *      board-specific logic.  These functions will perform chip selection
 *      and status operations using GPIOs in the way your board is configured.
 *   2. If CONFIG_SPI_CMDDATA is defined in the NuttX configuration, provide
 *      sam3u_spicmddata() functions in your board-specific logic.  This
 *      function will perform cmd/data selection operations using GPIOs in
 *      the way your board is configured.
 *   3. Add a call to up_spiinitialize() in your low level application
 *      initialization logic
 *   4. The handle returned by up_spiinitialize() 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_SAM3U_SPI
int sam3u_spiselect(enum spi_dev_e devid)
{
  int cs = -EINVAL;

#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_ADS7843E)
  if (devid == SPIDEV_TOUCHSCREEN)
    {
      /* Assert the CS pin to the OLED display */

	  cs = 2;
    }
#endif

  spidbg("devid: %d CS: %d\n", (int)devid, cs);
  return cs;
}

uint8_t sam3u_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
  return 0;
}
#endif

#endif /* CONFIG_SAM3U_SPI */