107 lines
3.9 KiB
C
107 lines
3.9 KiB
C
/****************************************************************************
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* boards/arm/tiva/lm4f120-launchpad/src/lm4f_ssi.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "arm_internal.h"
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#include "chip.h"
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#include "tiva_gpio.h"
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#include "lmf4120-launchpad.h"
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/* The LM4F LaunchPad microSD CS is on SSI0 */
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#if defined(CONFIG_TIVA_SSI0) || defined(CONFIG_TIVA_SSI1)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* CONFIG_DEBUG_SPI enables debug output from this file */
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#ifdef CONFIG_DEBUG_SPI
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# define ssi_dumpgpio(m) tiva_dumpgpio(SDCCS_GPIO, m)
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#else
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# define ssi_dumpgpio(m)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lm4f_spidev_initialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the LM4F LaunchPad.
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*
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****************************************************************************/
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void weak_function lm4f_spidev_initialize(void)
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{
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}
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/****************************************************************************
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* The external functions, tiva_ssiselect and tiva_ssistatus 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
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* (see include/nuttx/spi/spi.h).
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* All othermethods (including tiva_ssibus_initialize()) are provided by
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* common logic.
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* To use this common SPI logic on your board:
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*
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* 1. Provide tiva_ssiselect() and tiva_ssistatus() 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_ssibus_initialize() in your low level
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* initialization logic
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* 3. The handle returned by tiva_ssibus_initialize() may then be used to
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* bind the 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_ssiselect(struct spi_dev_s *dev, uint32_t devid, bool selected)
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{
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spiinfo("devid: %d CS: %s\n", (int)devid,
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selected ? "assert" : "de-assert");
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ssi_dumpgpio("tiva_ssiselect() Entry");
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ssi_dumpgpio("tiva_ssiselect() Exit");
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}
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uint8_t tiva_ssistatus(struct spi_dev_s *dev, uint32_t devid)
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{
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spiinfo("Returning SPI_STATUS_PRESENT\n");
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return SPI_STATUS_PRESENT;
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}
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#endif /* CONFIG_TIVA_SSI0 || CONFIG_TIVA_SSI1 */
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