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/************************************************************************************
* configs/tm4c1294-launchpad/src/tm4c_ssi.c
*
* Copyright (C) 2015 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 "tm4c1294-launchpad.h"
/* The TM4C1294-Launchpad microSD CS is on SSI0 */
#if defined(CONFIG_TIVA_SSI0) || defined(CONFIG_TIVA_SSI1)
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
/* CONFIG_DEBUG_SPI enables debug output from this file (needs CONFIG_DEBUG too) */
#ifdef CONFIG_DEBUG_SPI
# define ssidbg lldbg
#else
# define ssidbg(x...)
#endif
/* Dump GPIO registers */
#if defined(CONFIG_DEBUG_SPI) && defined(CONFIG_DEBUG_VERBOSE)
# define ssivdbg lldbg
# define ssi_dumpgpio(m) tiva_dumpgpio(SDCCS_GPIO, m)
#else
# define ssivdbg(x...)
# define ssi_dumpgpio(m)
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
/************************************************************************************
* Public Functions
************************************************************************************/
/************************************************************************************
* Name: tm4c_ssiinitialize
*
* Description:
* Called to configure SPI chip select GPIO pins for the DK-TM4C129X.
*
************************************************************************************/
void weak_function tm4c_ssiinitialize(void)
{
}
/****************************************************************************
* 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 other methods (including tiva_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 tiva_spiinitialize() in your low level initialization
* logic
* 3. The handle returned by tiva_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");
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_TIVA_SSI0 || CONFIG_TIVA_SSI1 */
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