nuttx/configs/eagle100/src/up_ssi.c

/************************************************************************************
 * configs/eagle100/src/up_ssi.c
 * arch/arm/src/board/up_ssi.c
 *
 *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
 *
 * 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 <sys/types.h>

#include <nuttx/spi.h>
#include <arch/board/board.h>

#include "up_arch.h"
#include "lm3s_internal.h"

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

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

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

/****************************************************************************
 * The external functions, lm3s_spiselect and lm3s_spistatus must be provided
 * by board-specific logic.  The are implementations of the select and status
 * methods SPI interface defined by struct spi_ops_s (see include/nuttx/spi.h).
 * All othermethods (including up_spiinitialize()) are provided by common
 * logic.  To use this common SPI logic on your board:
 *
 *   1. Provide lm3s_spiselect() and lm3s_spistatus() functions in your
 *      board-specific logic.  This function will perform chip selection and
 *      status operations using GPIOs in the way your board is configured.
 *   2. Add a call to up_spiinitialize() in your low level initialization
 *      logic
 *   3. 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).
 *
 ****************************************************************************/

void lm3s_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, boolean selected)
{
  if (devid == SPIDEV_MMCSD)
    {
      /* Assert the CS pin to the card */

      lm3s_gpiowrite(SDC_CS, selected ? 0 : 1);
    }
}

ubyte lm3s_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
#warning "Need to check schematic"
  return SPI_STATUS_PRESENT;
}