boards/arm/kinetis/freedom-k66f/src/k66_spi.c

/****************************************************************************
 * boards/arm/kinetis/freedom-k66f/src/k66_spi.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdint.h>
#include <stdbool.h>
#include <assert.h>
#include <debug.h>

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

#include "arm_internal.h"
#include "chip.h"
#include "kinetis.h"
#include "freedom-k66f.h"

#if defined(CONFIG_KINETIS_SPI0) || defined(CONFIG_KINETIS_SPI1) || \
    defined(CONFIG_KINETIS_SPI2)

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

/****************************************************************************
 * Name: k66_spidev_initialize
 *
 * Description:
 *   Called to configure SPI chip select GPIO pins for the FREEDOM-K66F
 *   board.
 *
 ****************************************************************************/

void weak_function k66_spidev_initialize(void)
{
  /* Initialize the CE CS pins on J6 RF/WIFI connector */

  kinetis_pinconfig(PIN_CE);
  kinetis_pinconfig(PIN_SPI1_PCS0);
}

/****************************************************************************
 * Name:  kinetis_spi[n]select, kinetis_spi[n]status, and
 *        kinetis_spi[n]cmddata
 *
 * 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/spi.h).
 *   All other methods including kinetis_spibus_initialize()) are provided
 *   by common Kinetis logic.
 *   To use this common SPI logic on your board:
 *
 *   1. Provide logic in kinetis_boardinitialize() to configure SPI chip
 *      select pins.
 *   2. Provide kinetis_spi[n]select() and kinetis_spi[n]status() 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
 *      kinetis_spi[n]cmddata() functions in your board-specific logic.
 *      These functions will perform cmd/data selection operations using
 *      GPIOs in the way your board is configured.
 *   3. Add a call to kinetis_spibus_initialize() in your low level
 *      application initialization logic
 *   4. The handle returned by kinetis_spibus_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_KINETIS_SPI0
void kinetis_spi0select(struct spi_dev_s *dev, uint32_t devid,
                        bool selected)
{
  spiinfo("devid: %d CS: %s\n", (int)devid,
          selected ? "assert" : "de-assert");
# warning "Missing logic"
}

uint8_t kinetis_spi0status(struct spi_dev_s *dev, uint32_t devid)
{
# warning "Missing logic"
  return SPI_STATUS_PRESENT;
}
#endif

#ifdef CONFIG_KINETIS_SPI1
void kinetis_spi1select(struct spi_dev_s *dev, uint32_t devid,
                        bool selected)
{
  spiinfo("devid: %d CS: %s\n", (int)devid,
          selected ? "assert" : "de-assert");
  kinetis_gpiowrite(PIN_SPI1_PCS0, !selected);
}

uint8_t kinetis_spi1status(struct spi_dev_s *dev, uint32_t devid)
{
# warning "Missing logic"
  return SPI_STATUS_PRESENT;
}
#endif

#ifdef CONFIG_KINETIS_SPI2
void kinetis_spi2select(struct spi_dev_s *dev, uint32_t devid,
                        bool selected)
{
  spiinfo("devid: %d CS: %s\n", (int)devid,
          selected ? "assert" : "de-assert");
# warning "Missing logic"
}

uint8_t kinetis_spi2status(struct spi_dev_s *dev, uint32_t devid)
{
# warning "Missing logic"
  return SPI_STATUS_PRESENT;
}
#endif

#endif /* CONFIG_KINETIS_SPI0 || CONFIG_KINETIS_SPI1 || CONFIG_KINETIS_SPI2 */