91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
/****************************************************************************
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* boards/hc/m9s12/demo9s12ne64/src/m9s12_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 "demo9s12ne64.h"
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#if defined(CONFIG_HCS12_SPI)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: hcs12_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 DEMO9S12NE64 board.
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*
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****************************************************************************/
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void weak_function hcs12_spidev_initialize(void)
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{
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}
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/****************************************************************************
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* Name: hcs12_spiselect and hcs12_spistatus
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*
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* Description:
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* The external functions, hcs12_spiselect and hcs12_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 hcs12_spibus_initialize()) are provided by
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* common HCS12 logic.
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* To use this common SPI logic on your board:
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*
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* 1. Provide logic in hcs12_boardinitialize() to configure SPI chip select
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* pins.
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* 2. Provide hcs12_spiselect() and hcs12_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 hcs12_spibus_initialize() in your low level
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* application initialization logic
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* 4. The handle returned by hcs12_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 hcs12_spiselect(FAR struct spi_dev_s *dev,
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uint32_t devid, bool selected)
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{
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}
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uint8_t hcs12_spistatus(FAR 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 /* CONFIG_HCS12_SPI */
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