/************************************************************************************
* configs/zkit-arm-1769/src/up_spi.c
* arch/arm/src/board/up_spi.c
*
* Copyright (C) 2013 Zilogic Systems. All rights reserved.
* Author: Kannan <code@zilogic.com>
*
* Based on configs/lpcxpresso-lpc1768/src/up_ssp.c
*
* Copyright (C) 2011 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.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "chip.h"
#include "lpc17_spi.h"
#include "lpc17_gpio.h"
#include "zkitarm_internal.h"
#if defined(CONFIG_LPC17_SPI)
/************************************************************************************
* Definitions
************************************************************************************/
/* CONFIG_DEBUG_SPI enables debug output from this file (needs CONFIG_DEBUG too) */
#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
/* Dump GPIO registers */
#if defined(CONFIG_DEBUG_SPI) && defined(CONFIG_DEBUG_VERBOSE)
# define spi_dumpgpio(m) lpc17_dumpgpio(SDCCS_GPIO, m)
#else
# define spi_dumpgpio(m)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: zkit_spiinitialize
*
* Description:
* Called to configure SPI chip select and card detect GPIO pins for the
* ZKIT-ARM-1769 Kit.
*
************************************************************************************/
void weak_function zkit_spiinitialize(void)
{
/* Configure the SPI-based microSD CS and Card Detect (CD) GPIO */
spi_dumpgpio("zkit_spiinitialize() Entry)");
/* Configure card detect and chip select for the SD slot. */
(void)lpc17_configgpio(ZKITARM_SD_CS);
(void)lpc17_configgpio(ZKITARM_SD_CD);
spi_dumpgpio("zkit_spiinitialize() Exit");
}
/************************************************************************************
* Name: lpc17_spiselect and lpc17_spistatus
*
* Description:
* The external functions, lpc17_spiselect and lpc17_spistatus
* 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.h). All other methods (including up_spiinitialize())
* 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_spiselect and lpc17_spistatus 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).
*
************************************************************************************/
void lpc17_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
spi_dumpgpio("lpc17_spiselect() Entry");
if (devid == SPIDEV_MMCSD)
{
/* Assert/de-assert the CS pin to the card */
(void)lpc17_gpiowrite(ZKITARM_SD_CS, !selected);
}
spi_dumpgpio("lpc17_spiselect() Exit");
}
uint8_t lpc17_spistatus(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(ZKITARM_SD_CD) == 0)
{
spidbg("Returning SPI_STATUS_PRESENT\n");
return SPI_STATUS_PRESENT;
}
}
spidbg("Returning zero\n");
return 0;
}
#ifdef CONFIG_SPI_CMDDATA
/******************************************************************************
* Name: lpc17_spicmddata
*
* Description: Dummy Function
*
******************************************************************************/
int lpc17_spicmddata(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool cmd)
{
return OK;
}
#endif /* CONFIG_SPI_CMDDATA */
#endif /* CONFIG_LPC17_SPI */
