text: /****************************************************************************
   * boards/arm/lpc17xx_40xx/lpc4088-devkit/src/lpc17_40_ssp.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 "lpc17_40_gpio.h"
  #include "lpc17_40_ssp.h"
  #include "lpc4088-devkit.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_devkit_sspdev_initialize
   *
   * Description:
   *   Called to configure SPI chip select GPIO pins for the LPC1766-STK.
   *
   ****************************************************************************/
  
  void weak_function lpc4088_devkit_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(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(struct spi_dev_s *dev, uint32_t devid)
  {
    spiinfo("Returning nothing\n");
    return 0;
  }
  #endif
  
  #ifdef CONFIG_LPC17_40_SSP1
  void  lpc17_40_ssp1select(struct spi_dev_s *dev, uint32_t devid,
                            bool selected)
  {
    spiinfo("devid: %d CS: %s\n", (int)devid,
            selected ? "assert" : "de-assert");
    if (devid == SPIDEV_TOUCHSCREEN(0))
      {
        /* Assert/de-assert the CS pin to the touchscreen */
  
        ssp_dumpgpio(GPIO_TC_CS, "lpc17_40_ssp1select() Entry");
        lpc17_40_gpiowrite(GPIO_TC_CS, !selected);
        ssp_dumpgpio(GPIO_TC_CS, "lpc17_40_ssp1select() Exit");
      }
  }
  
  uint8_t lpc17_40_ssp1status(struct spi_dev_s *dev, uint32_t devid)
  {
    spiinfo("Returning nothing\n");
    return 0;
  }
  #endif
  
  #ifdef CONFIG_LPC17_40_SSP2
  void  lpc17_40_ssp2select(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(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 */
  