nuttx/configs/stm32_tiny/src/up_spi.c

/************************************************************************************
 * configs/stm32_tiny/src/up_spi.c
 *
 *   Copyright (C) 2009, 2011-2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *           Laurent Latil <laurent@latil.nom.fr>
 *
 * 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 "stm32.h"
#include "stm32_tiny-internal.h"

#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2)

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

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

#ifndef CONFIG_DEBUG
#  undef CONFIG_DEBUG_VERBOSE
#  undef CONFIG_DEBUG_SPI
#endif

#ifdef CONFIG_DEBUG_SPI
#  define spidbg lldbg
#  ifdef CONFIG_DEBUG_VERBOSE
#    define spivdbg lldbg
#  else
#    define spivdbg(x...)
#  endif
#else
#  define spidbg(x...)
#  define spivdbg(x...)
#endif

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

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

/************************************************************************************
 * Name: stm32_spiinitialize
 *
 * Description:
 *   Called to configure SPI chip select GPIO pins for the HY-MiniSTM32 board.
 *
 ************************************************************************************/

void stm32_spiinitialize(void)
{
  /* NOTE: Clocking for SPI1 and/or SPI2 was already provided in stm32_rcc.c.
   *       Configurations of SPI pins is performed in stm32_spi.c.
   *       Here, we only initialize chip select pins unique to the board
   *       architecture.
   */

#ifdef CONFIG_STM32_SPI2
#  ifdef CONFIG_WL_NRF24L01
  /* Configure the SPI-based NRF24L01 chip select GPIO */
  spivdbg("Configure GPIO for SPI2/CS\n");
  stm32_configgpio(GPIO_NRF24L01_CS);
#  endif
#endif
}

/****************************************************************************
 * Name:  stm32_spi1/2select and stm32_spi1/2status
 *
 * Description:
 *   The external functions, stm32_spi1/2/3select and stm32_spi1/2/3status 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 up_spiinitialize())
 *   are provided by common STM32 logic.  To use this common SPI logic on your
 *   board:
 *
 *   1. Provide logic in stm32_boardinitialize() to configure SPI chip select
 *      pins.
 *   2. Provide stm32_spi1/2/3select() and stm32_spi1/2/3status() 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 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_STM32_SPI1
void stm32_spi1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
}

uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
  return 0;
}
#endif

#ifdef CONFIG_STM32_SPI2
void stm32_spi2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
  switch(devid)
  {
#ifdef CONFIG_WL_NRF24L01
    case SPIDEV_WIRELESS:
      spivdbg("nRF24L01 device %s\n", selected ? "asserted" : "de-asserted");

      /* Set the GPIO low to select and high to de-select */

      stm32_gpiowrite(GPIO_NRF24L01_CS, !selected);
      break;
#endif
    default:
      break;
  }
}

uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
  uint8_t status = 0;
  switch(devid)
   {
#ifdef CONFIG_WL_NRF24L01
     case SPIDEV_WIRELESS:
       status |= SPI_STATUS_PRESENT;
       break;
#endif
     default:
       break;
   }
  return status;
}

#endif

#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */