145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
/***************************************************************************//**
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* @file spi.c
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* @brief Implementation of the SPI Interface
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* @author Antoniu Miclaus ([email protected])
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********************************************************************************
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* Copyright 2020(c) Analog Devices, Inc.
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*
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* All rights reserved.
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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 are met:
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* - 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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* - 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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* - Neither the name of Analog Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* - The use of this software may or may not infringe the patent rights
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* of one or more patent holders. This license does not release you
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* from the requirement that you obtain separate licenses from these
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* patent holders to use this software.
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* - Use of the software either in source or binary form, must be run
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* on or directly connected to an Analog Devices Inc. component.
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*
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* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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#include <inttypes.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../../include/spi.h"
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#include "../../include/error.h"
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/**
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* @brief Initialize the SPI communication peripheral.
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* @param desc - The SPI descriptor.
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* @param param - The structure that contains the SPI parameters.
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* @return SUCCESS in case of success, FAILURE otherwise.
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*/
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int32_t spi_init(struct spi_desc **desc,
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const struct spi_init_param *param)
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{
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if (!param)
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return FAILURE;
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if ((param->platform_ops->init(desc, param)))
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return FAILURE;
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(*desc)->platform_ops = param->platform_ops;
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return SUCCESS;
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}
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/**
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* @brief Free the resources allocated by spi_init().
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* @param desc - The SPI descriptor.
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* @return SUCCESS in case of success, FAILURE otherwise.
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*/
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int32_t spi_remove(struct spi_desc *desc)
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{
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return desc->platform_ops->remove(desc);
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}
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/**
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* @brief Write and read data to/from SPI.
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* @param desc - The SPI descriptor.
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* @param data - The buffer with the transmitted/received data.
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* @param bytes_number - Number of bytes to write/read.
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* @return SUCCESS in case of success, FAILURE otherwise.
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*/
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int32_t spi_write_and_read(struct spi_desc *desc,
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uint8_t *data,
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uint16_t bytes_number)
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{
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return desc->platform_ops->write_and_read(desc, data, bytes_number);
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}
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/**
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* @brief Write and read data to/from SPI in 3 wire mode.
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* @param desc - The SPI descriptor.
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* @param write_data - The buffer with the transmitted data.
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* @param read_data - The buffer with the received data.
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* @param write_bytes_number - Number of bytes to write.
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* @param read_bytes_number - Number of bytes to read.
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* @return SUCCESS in case of success, FAILURE otherwise.
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*/
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int32_t spi_write_and_read_3wire(struct spi_desc *desc,
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uint8_t *write_data,
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uint8_t *read_data,
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uint16_t write_bytes_number,
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uint16_t read_bytes_number)
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{
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int ret;
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if(desc->platform_ops->write_and_read_3wire != NULL){
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return desc->platform_ops->write_and_read_3wire(desc, write_data, read_data,
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write_bytes_number, read_bytes_number);
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}
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else{
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return FAILURE;
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}
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}
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/**
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* @brief Iterate over head list and send all spi messages
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* @param desc - The SPI descriptor.
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* @param msgs - Array of messages.
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* @param len - Number of messages in the array.
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* @return SUCCESS in case of success, negativ error code otherwise.
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*/
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int32_t spi_transfer(struct spi_desc *desc, struct spi_msg *msgs, uint32_t len)
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{
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int32_t ret;
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uint32_t i;
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if (!desc || !desc->platform_ops)
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return -EINVAL;
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if (desc->platform_ops->transfer)
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return desc->platform_ops->transfer(desc, msgs, len);
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for (i = 0; i < len; i++) {
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if (msgs[i].rx_buff != msgs[i].tx_buff || !msgs[i].tx_buff)
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return -EINVAL;
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ret = spi_write_and_read(desc, msgs[i].rx_buff,
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msgs[i].bytes_number);
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if (IS_ERR_VALUE(ret))
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return ret;
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}
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return SUCCESS;
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}
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