134 lines
5.2 KiB
C
134 lines
5.2 KiB
C
/************************************************************************************
|
|
* configs/lm4f120-launchpad/src/lm4f_ssi.c
|
|
* arch/arm/src/board/lm4f_ssi.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 "tiva_gpio.h"
|
|
#include "lmf4120-launchpad.h"
|
|
|
|
/* The LM4F LaunchPad microSD CS is on SSI0 */
|
|
|
|
#if defined(CONFIG_TIVA_SSI0) || defined(CONFIG_TIVA_SSI1)
|
|
|
|
/************************************************************************************
|
|
* 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: lm4f_ssiinitialize
|
|
*
|
|
* Description:
|
|
* Called to configure SPI chip select GPIO pins for the LM4F LaunchPad.
|
|
*
|
|
************************************************************************************/
|
|
|
|
void weak_function lm4f_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 othermethods (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 */
|