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nuttx/configs/open1788/src/lpc17_ssp.c
Gregory Nutt 09faaccc02 Created new directories to hold SPI-related files
2013-07-01 08:11:54 -06:00

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/****************************************************************************
* configs/open1788/src/lpc17_ssp.c
* arch/arm/src/board/lpc17_ssp.c
*
* Copyright (C) 2013 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/spi.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "lpc17_gpio.h"
#include "lpc17_ssp.h"
#include "open1788.h"
#if defined(CONFIG_LPC17_SSP0) || defined(CONFIG_LPC17_SSP1) || \
defined(CONFIG_LPC17_SSP2)
/****************************************************************************
* Definitions
****************************************************************************/
/* Debug ********************************************************************/
#ifdef CONFIG_DEBUG_SPI
# define sspdbg lldbg
# ifdef CONFIG_DEBUG_VERBOSE
# define sspvdbg lldbg
# else
# define sspvdbg(x...)
# endif
#else
# define sspdbg(x...)
# define sspvdbg(x...)
#endif
/* Dump GPIO registers */
#ifdef CONFIG_DEBUG_VERBOSE
# define ssp_dumpgpio(p,m) lpc17_dumpgpio(p,m)
#else
# define ssp_dumpgpio(p,m)
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: open1788_sspinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the LPC1766-STK.
*
****************************************************************************/
void weak_function open1788_sspinitialize(void)
{
/* Configure the SSP0 chip select GPIOs. */
#ifdef CONFIG_LPC17_SSP0
#endif
/* Configure SSP1 chip select GPIOs. This includes the touchscreen on the
* the LCD module.
*/
#ifdef CONFIG_LPC17_SSP1
ssp_dumpgpio(GPIO_TC_CS, "BEFORE SSP1 Initialization");
lpc17_configgpio(GPIO_TC_CS);
ssp_dumpgpio(GPIO_TC_CS, "AFTER SSP1 Initialization");
#endif
/* Configure the SSP2 chip select GPIOs. */
#ifdef CONFIG_LPC17_SSP2
#endif
}
/************************************************************************************
* Name: lpc17_ssp0/1/2select and lpc17_ssp0/1/2status
*
* Description:
* The external functions, lpc17_ssp0/1/2select and lpc17_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_sspinitialize())
* are provided by common LPC17xx logic. To use this common SPI logic on your
* board:
*
* 1. Provide logic in lpc17_boardinitialize() to configure SPI/SSP chip select
* pins.
* 2. Provide lpc17_ssp0/1/2select() and lpc17_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_sspinitialize() in your low level application
* initialization logic
* 4. The handle returned by lpc17_sspinitialize() 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_SSP0
void lpc17_ssp0select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
}
uint8_t lpc17_ssp0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
sspdbg("Returning nothing\n");
return 0;
}
#endif
#ifdef CONFIG_LPC17_SSP1
void lpc17_ssp1select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
if (devid == SPIDEV_TOUCHSCREEN)
{
/* Assert/de-assert the CS pin to the touchscreen */
ssp_dumpgpio(GPIO_TC_CS, "lpc17_ssp1select() Entry");
lpc17_gpiowrite(GPIO_TC_CS, !selected);
ssp_dumpgpio(GPIO_TC_CS, "lpc17_ssp1select() Exit");
}
}
uint8_t lpc17_ssp1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
sspdbg("Returning nothing\n");
return 0;
}
#endif
#ifdef CONFIG_LPC17_SSP2
void lpc17_ssp2select(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
sspdbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
}
uint8_t lpc17_ssp2status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
sspdbg("Returning nothing\n");
return 0;
}
#endif
#endif /* CONFIG_LPC17_SSP0 || CONFIG_LPC17_SSP1 || CONFIG_LPC17_SSP2 */
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