107 lines
3.8 KiB
C
107 lines
3.8 KiB
C
/****************************************************************************
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* boards/arm/lpc31xx/ea3152/src/lpc31_spi.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 "lpc31.h"
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#include "ea3152.h"
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#ifdef CONFIG_LPC31_SPI
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#if 0
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/* At present, EA3152 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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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lpc31_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 EA3152 board.
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*
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****************************************************************************/
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void weak_function lpc31_spidev_initialize(void)
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{
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/* NOTE: Clocking for SPI has already been provided.
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* Pin configuration is performed on-the-fly,
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* 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/spi.h).
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* All other methods (including lpc31_spibus_initialize())
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* are provided by common LPC31XX logic. To use this common SPI logic on
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* your 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 lpc31_spibus_initialize() in your low level
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* application initialization logic
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* 4. The handle returned by lpc31_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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void lpc31_spiselect(struct spi_dev_s *dev,
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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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#warning "Missing logic"
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}
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uint8_t lpc31_spistatus(struct spi_dev_s *dev, uint32_t 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_LPC31_SPI */
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