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nuttx/configs/lpcxpresso-lpc1768/src/up_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/lpcxpresso-lpc1768/src/up_ssp.c
* arch/arm/src/board/up_ssp.c
*
* Copyright (C) 2011, 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 "lpcxpresso_internal.h"
#if defined(CONFIG_LPC17_SSP0) || defined(CONFIG_LPC17_SSP1)
/************************************************************************************
* Definitions
************************************************************************************/
/* Enables debug output from this file (needs CONFIG_DEBUG too) */
#undef SSP_DEBUG /* Define to enable debug */
#undef SSP_VERBOSE /* Define to enable verbose debug */
#ifdef SSP_DEBUG
# define sspdbg lldbg
# ifdef SSP_VERBOSE
# define sspvdbg lldbg
# else
# define sspvdbg(x...)
# endif
#else
# undef SSP_VERBOSE
# define sspdbg(x...)
# define sspvdbg(x...)
#endif
/* Dump GPIO registers */
#ifdef SSP_VERBOSE
# define ssp_dumpgpio(m) lpc17_dumpgpio(SDCCS_GPIO, m)
#else
# define ssp_dumpgpio(m)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: lpcxpresso_sspinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the LPCXpresso.
*
************************************************************************************/
void weak_function lpcxpresso_sspinitialize(void)
{
/* Configure the SPI-based microSD CS GPIO */
ssp_dumpgpio("lpcxpresso_sspinitialize() Entry)");
/* Configure card detect and chip select for the SD slot. NOTE: Jumper J55 must
* be set correctly for the SD slot chip select.
*/
#ifdef CONFIG_LPC17_SSP1
(void)lpc17_configgpio(LPCXPRESSO_SD_CS);
(void)lpc17_configgpio(LPCXPRESSO_SD_CD);
/* Configure chip select for the OLED. For the SPI interface, insert jumpers in
* J42, J43, J45 pin1-2 and J46 pin 1-2.
*/
#ifdef CONFIG_NX_LCDDRIVER
(void)lpc17_configgpio(LPCXPRESSO_OLED_CS);
#endif
#endif
ssp_dumpgpio("lpcxpresso_sspinitialize() Exit");
}
/************************************************************************************
* Name: lpc17_ssp0/ssp1select and lpc17_ssp0/ssp1status
*
* Description:
* The external functions, lpc17_ssp0/ssp1select and lpc17_ssp0/ssp1status
* 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/ssp1select() and lpc17_ssp0/ssp1status() 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");
ssp_dumpgpio("lpc17_ssp0select() Entry");
#warning "Assert CS here (false)"
ssp_dumpgpio("lpc17_ssp0select() Exit");
}
uint8_t lpc17_ssp0status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
sspdbg("Returning SPI_STATUS_PRESENT\n");
return SPI_STATUS_PRESENT;
}
#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");
ssp_dumpgpio("lpc17_ssp1select() Entry");
if (devid == SPIDEV_MMCSD)
{
/* Assert/de-assert the CS pin to the card */
(void)lpc17_gpiowrite(LPCXPRESSO_SD_CS, !selected);
}
#ifdef CONFIG_NX_LCDDRIVER
else if (devid == SPIDEV_DISPLAY)
{
/* Assert the CS pin to the OLED display */
(void)lpc17_gpiowrite(LPCXPRESSO_OLED_CS, !selected);
}
#endif
ssp_dumpgpio("lpc17_ssp1select() Exit");
}
uint8_t lpc17_ssp1status(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
if (devid == SPIDEV_MMCSD)
{
/* Read the state of the card-detect bit */
if (lpc17_gpioread(LPCXPRESSO_SD_CD) == 0)
{
sspdbg("Returning SPI_STATUS_PRESENT\n");
return SPI_STATUS_PRESENT;
}
}
sspdbg("Returning zero\n");
return 0;
}
#endif
#endif /* CONFIG_LPC17_SSP0 || CONFIG_LPC17_SSP1 */
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