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/************************************************************************************
* configs/lm3s6965-ek/src/up_ssi.c
* arch/arm/src/board/up_ssi.c
*
* Copyright (C) 2010 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 "tiva_gpio.h"
#include "lm3s6965ek_internal.h"
/* The LM3S6965 Eval Kit microSD CS is on SSI0 */
#if !defined(CONFIG_SSI0_DISABLE) /* || !defined(CONFIG_SSI1_DISABLE) */
/************************************************************************************
* Definitions
************************************************************************************/
/* Enables debug output from this file (needs CONFIG_DEBUG too) */
#undef SSI_DEBUG /* Define to enable debug */
#undef SSI_VERBOSE /* Define to enable verbose debug */
#ifdef SSI_DEBUG
# define ssidbg lldbg
# ifdef SSI_VERBOSE
# define ssivdbg lldbg
# else
# define ssivdbg(x...)
# endif
#else
# undef SSI_VERBOSE
# define ssidbg(x...)
# define ssivdbg(x...)
#endif
/* Dump GPIO registers */
#ifdef SSI_VERBOSE
# define ssi_dumpgpio(m) tiva_dumpgpio(SDCCS_GPIO, m)
#else
# define ssi_dumpgpio(m)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: tiva_ssiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the LM3S6965 Eval Kit.
*
************************************************************************************/
void weak_function lm_ssiinitialize(void)
{
/* Configure the SPI-based microSD CS GPIO */
ssi_dumpgpio("lm_ssiinitialize() Entry)");
tiva_configgpio(SDCCS_GPIO);
#ifdef CONFIG_NX_LCDDRIVER
tiva_configgpio(OLEDCS_GPIO);
#endif
ssi_dumpgpio("lm_ssiinitialize() Exit");
}
/****************************************************************************
* The external functions, tiva_spiselect and tiva_spistatus must be provided
* by board-specific logic. The are implementations of the select and status
* methods SPI interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
* All othermethods (including up_spiinitialize()) are provided by common
* logic. To use this common SPI logic on your board:
*
* 1. Provide tiva_spiselect() and tiva_spistatus() functions in your
* board-specific logic. This function will perform chip selection and
* status operations using GPIOs in the way your board is configured.
* 2. Add a call to up_spiinitialize() in your low level initialization
* logic
* 3. 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 tiva_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
{
ssidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
ssi_dumpgpio("tiva_spiselect() Entry");
if (devid == SPIDEV_MMCSD)
{
/* Assert the CS pin to the card */
tiva_gpiowrite(SDCCS_GPIO, !selected);
}
#ifdef CONFIG_NX_LCDDRIVER
else if (devid == SPIDEV_DISPLAY)
{
/* Assert the CS pin to the display */
tiva_gpiowrite(OLEDCS_GPIO, !selected);
}
#endif
ssi_dumpgpio("tiva_spiselect() Exit");
}
uint8_t tiva_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
{
ssidbg("Returning SPI_STATUS_PRESENT\n");
return SPI_STATUS_PRESENT;
}
#endif /* !CONFIG_SSI0_DISABLE || !CONFIG_SSI1_DISABLE */
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