127 lines
5.5 KiB
C
127 lines
5.5 KiB
C
/****************************************************************************
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* arch/arm/src/efm32/efm32_spi.h
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*
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* Copyright (C) 2009-2013 Bouteville Pierre-Noel. All rights reserved.
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* Author: Bouteville Pierre-Noel <pnb990@gmail.com>
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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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#ifndef __ARCH_ARM_EFM32_EFM32_SPI_H
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#define __ARCH_ARM_EFM32_EFM32_SPI_H
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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 "efm32_config.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct spi_dev_s; /* Forward reference */
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/****************************************************************************
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* Name: efm32_spibus_initialize
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*
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* Description:
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* Initialize the selected SPI port
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*
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* Input Parameters:
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* port - SPI port number to initialize. One of {0,1,2}
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*
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* Returned Value:
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* Valid SPI device structure reference on success; a NULL on failure
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*
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****************************************************************************/
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struct spi_dev_s *efm32_spibus_initialize(int port);
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/****************************************************************************
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* Name: efm32_spi[n]_select, efm32_spi[n]_status, and efm32_spi[n]_cmddata
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*
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* Description:
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* The external functions, efm32_spi[n]_select, efm32_spi[n]_status, and
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* efm32_spi[n]_cmddata must be provided by board-specific logic. These
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* are implementations of the select, status, and cmddata methods of the
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* SPI interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
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* All other methods (including efm32_spibus_initialize()) are provided by
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* common EFM32 logic. To use this common SPI logic on your board:
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*
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* 1. Provide logic in efm32_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide efm32_spi[n]_select() and efm32_spi[n]_status() functions in
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* your board-specific logic. These functions will perform chip
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* selection and status operations using GPIOs in the way your board is
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* configured.
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* 3. If CONFIG_SPI_CMDDATA is defined in your NuttX configuration file,
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* then provide efm32_spi[n]_cmddata() functions in your board-specific
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* logic. These functions will perform cmd/data selection operations
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* using GPIOs in the way your board is configured.
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* 4. Add a calls to efm32_spibus_initialize() in your low level
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* application initialization logic
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* 5. The handle returned by efm32_spibus_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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#ifdef CONFIG_EFM32_USART0_ISSPI
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void efm32_spi0_select(struct spi_dev_s *dev, uint32_t devid,
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bool selected);
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uint8_t efm32_spi0_status(struct spi_dev_s *dev, uint32_t devid);
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int efm32_spi0_cmddata(struct spi_dev_s *dev, uint32_t devid,
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bool cmd);
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#endif
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#ifdef CONFIG_EFM32_USART1_ISSPI
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void efm32_spi1_select(struct spi_dev_s *dev, uint32_t devid,
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bool selected);
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uint8_t efm32_spi1_status(struct spi_dev_s *dev, uint32_t devid);
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int efm32_spi1_cmddata(struct spi_dev_s *dev, uint32_t devid,
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bool cmd);
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#endif
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#ifdef CONFIG_EFM32_USART2_ISSPI
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void efm32_spi2_select(struct spi_dev_s *dev, uint32_t devid,
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bool selected);
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uint8_t efm32_spi2_status(struct spi_dev_s *dev, uint32_t devid);
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int efm32_spi2_cmddata(struct spi_dev_s *dev, uint32_t devid,
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bool cmd);
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#endif
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#endif /* __ARCH_ARM_EFM32_EFM32_SPI_H */
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