133 lines
5.1 KiB
C
133 lines
5.1 KiB
C
/************************************************************************************
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* configs/tm4c123g-launchpad/src/tm4c_ssi.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <nuttx/spi/spi.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "chip.h"
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#include "tiva_gpio.h"
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#include "tm4c123g-launchpad.h"
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/* The TM4C123G LaunchPad microSD CS is on SSI0 */
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#if !defined(CONFIG_SSI0_DISABLE) || !defined(CONFIG_SSI1_DISABLE)
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* CONFIG_DEBUG_SPI enables debug output from this file (needs CONFIG_DEBUG too) */
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#ifdef CONFIG_DEBUG_SPI
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# define ssidbg lldbg
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#else
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# define ssidbg(x...)
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#endif
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/* Dump GPIO registers */
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#if defined(CONFIG_DEBUG_SPI) && defined(CONFIG_DEBUG_VERBOSE)
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# define ssivdbg lldbg
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# define ssi_dumpgpio(m) tiva_dumpgpio(SDCCS_GPIO, m)
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#else
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# define ssivdbg(x...)
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# define ssi_dumpgpio(m)
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: tm4c_ssiinitialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the TM4C123G LaunchPad.
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*
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************************************************************************************/
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void weak_function tm4c_ssiinitialize(void)
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{
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}
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/****************************************************************************
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* The external functions, tiva_spiselect and tiva_spistatus must be provided
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* by board-specific logic. The are implementations of the select and status
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* methods SPI interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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* All othermethods (including tiva_spiinitialize()) are provided by common
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* logic. To use this common SPI logic on your board:
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*
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* 1. Provide tiva_spiselect() and tiva_spistatus() functions in your
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* board-specific logic. This function will perform chip selection and
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* status operations using GPIOs in the way your board is configured.
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* 2. Add a call to tiva_spiinitialize() in your low level initialization
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* logic
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* 3. The handle returned by tiva_spiinitialize() may then be used to bind the
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* SPI driver to higher level logic (e.g., calling
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* mmcsd_spislotinitialize(), for example, will bind the SPI driver to
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* the SPI MMC/SD driver).
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*
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****************************************************************************/
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void tiva_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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ssidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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ssi_dumpgpio("tiva_spiselect() Entry");
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ssi_dumpgpio("tiva_spiselect() Exit");
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}
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uint8_t tiva_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
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{
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ssidbg("Returning SPI_STATUS_PRESENT\n");
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return SPI_STATUS_PRESENT;
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}
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#endif /* !CONFIG_SSI0_DISABLE || !CONFIG_SSI1_DISABLE */
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