143 lines
5.4 KiB
C
143 lines
5.4 KiB
C
/************************************************************************************
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* configs/ea3131/src/up_spi.c
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* arch/arm/src/board/up_spi.c
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*
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* Copyright (C) 2009-2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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.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 "lpc31_internal.h"
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#include "ea3131_internal.h"
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#ifdef CONFIG_LPC31XX_SPI
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#if 0 /* At present, EA3131 specific logic is hard-coded in the file lpc31_spi.c
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* in arch/arm/src/lpc31xx */
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/************************************************************************************
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* Definitions
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************************************************************************************/
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/* Enables debug output from this file (needs CONFIG_DEBUG too) */
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#undef SPI_DEBUG /* Define to enable debug */
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#undef SPI_VERBOSE /* Define to enable verbose debug */
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#ifdef SPI_DEBUG
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# define spidbg lldbg
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# ifdef SPI_VERBOSE
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# define spivdbg lldbg
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# else
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# define spivdbg(x...)
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# endif
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#else
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# undef SPI_VERBOSE
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# define spidbg(x...)
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# define spivdbg(x...)
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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: lpc31_spiinitialize
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*
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* Description:
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* Called to configure SPI chip select GPIO pins for the EA3131 board.
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*
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************************************************************************************/
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void weak_function lpc31_spiinitialize(void)
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{
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/* NOTE: Clocking for SPI has already been provided. Pin configuration is performed
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* on-the-fly, so no additional setup is required.
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*/
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}
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/************************************************************************************
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* Name: lpc31_spiselect and lpc31_spistatus
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*
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* Description:
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* The external functions, lpc31_spiselect and lpc31_spistatus must be
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* provided by board-specific logic. They are implementations of the select
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* and status methods of the SPI interface defined by struct spi_ops_s (see
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* include/nuttx/spi.h). All other methods (including up_spiinitialize())
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* are provided by common LPC31XX logic. To use this common SPI logic on your
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* board:
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*
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* 1. Provide logic in lpc31_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide lpc31_spiselect() and lpc31_spistatus() functions in your
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* board-specific logic. These functions will perform chip selection and
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* status operations using GPIOs in the way your board is configured.
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* 3. Add a calls to up_spiinitialize() in your low level application
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* initialization logic
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* 4. The handle returned by up_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 lpc31_spiselect(FAR struct spi_dev_s *dev, enum spi_dev_e devid, bool selected)
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{
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spidbg("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
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#warning "Missing logic"
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}
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uint8_t lpc31_spistatus(FAR struct spi_dev_s *dev, enum spi_dev_e devid)
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{
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return SPI_STATUS_PRESENT;
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}
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#endif /* 0 */
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#endif /* CONFIG_LPC31XX_SPI */
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