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/***************************************************************************//**
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* @file spi.h
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* @brief Header file of SPI Interface
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* @author DBogdan ([email protected])
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********************************************************************************
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* Copyright 2019(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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#ifndef _SPI_H_
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#define _SPI_H_
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/******************************************************************************/
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/***************************** Include Files **********************************/
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/******************************************************************************/
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#include <stdint.h>
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/******************************************************************************/
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/********************** Macros and Constants Definitions **********************/
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/******************************************************************************/
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#define SPI_CPHA 0x01
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#define SPI_CPOL 0x02
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#define SPI_3WIRE 0x04
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/******************************************************************************/
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/*************************** Types Declarations *******************************/
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/******************************************************************************/
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/**
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* @enum spi_mode
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* @brief SPI configuration for clock phase and polarity.
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*/
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enum spi_mode {
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/** Data on rising, shift out on falling */
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SPI_MODE_0 = (0 | 0),
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/** Data on falling, shift out on rising */
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SPI_MODE_1 = (0 | SPI_CPHA),
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/** Data on rising, shift out on falling */
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SPI_MODE_2 = (SPI_CPOL | 0),
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/** Data on falling, shift out on rising */
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SPI_MODE_3 = (SPI_CPOL | SPI_CPHA),
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/** Data on rising, shift out on falling */
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SPI_MODE_4 = SPI_3WIRE
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};
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/**
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* @enum spi_bit_order
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* @brief SPI configuration for bit order (MSB/LSB).
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*/
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enum spi_bit_order {
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/** Most-significant bit (MSB) first */
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SPI_BIT_ORDER_MSB_FIRST = 0,
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/** Least-significant bit (LSB) first */
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SPI_BIT_ORDER_LSB_FIRST = 1,
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};
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/**
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* @struct spi_msg_list
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* @brief List item describing a SPI transfer
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*/
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struct spi_msg {
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/** Buffer with data to send. If NULL, 0x00 will be sent */
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uint8_t *tx_buff;
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/** Buffer where to store data. If NULL, incoming data won't be saved */
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uint8_t *rx_buff;
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/** Length of buffers. Must have equal size. */
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uint32_t bytes_number;
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/** If set, CS will be deasserted after the transfer */
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uint8_t cs_change;
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/**
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* Minimum delay (in us) between the CS de-assert event of the current message
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* and the assert of the next one.
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*/
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uint32_t cs_change_delay;
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/** Delay (in us) between the CS assert and the first SCLK edge. */
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uint32_t cs_delay_first;
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/** Delay (in us) between the last SCLK edge and the CS deassert */
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uint32_t cs_delay_last;
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};
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/**
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* @struct spi_platform_ops
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* @brief Structure holding SPI function pointers that point to the platform
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* specific function
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*/
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struct spi_platform_ops ;
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/**
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* @struct spi_init_param
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* @brief Structure holding the parameters for SPI initialization
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*/
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struct spi_init_param {
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/** Device ID */
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uint32_t device_id;
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/** maximum transfer speed */
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uint32_t max_speed_hz;
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/** SPI chip select */
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uint8_t chip_select;
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/** SPI mode */
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enum spi_mode mode;
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/** SPI bit order */
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enum spi_bit_order bit_order;
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const struct spi_platform_ops *platform_ops;
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/** SPI extra parameters (device specific) */
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void *extra;
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/** Parent of the device */
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struct spi_desc *parent;
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};
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/**
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* @struct spi_desc
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* @brief Structure holding SPI descriptor.
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*/
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struct spi_desc {
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/** Device ID */
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uint32_t device_id;
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/** maximum transfer speed */
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uint32_t max_speed_hz;
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/** SPI chip select */
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uint8_t chip_select;
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/** SPI mode */
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enum spi_mode mode;
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/** SPI bit order */
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enum spi_bit_order bit_order;
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const struct spi_platform_ops *platform_ops;
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/** SPI extra parameters (device specific) */
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void *extra;
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/** Parent of the device */
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struct spi_desc *parent;
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};
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/**
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* @struct spi_platform_ops
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* @brief Structure holding SPI function pointers that point to the platform
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* specific function
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*/
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struct spi_platform_ops {
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/** SPI initialization function pointer */
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int32_t (*init)(struct spi_desc **, const struct spi_init_param *);
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/** SPI write/read function pointer */
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int32_t (*write_and_read)(struct spi_desc *, uint8_t *, uint16_t);
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/** SPI write function pointer */
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int32_t (*write_and_read_3wire)(struct spi_desc *, uint8_t *,uint8_t *,uint16_t, uint16_t);
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/** Iterate over the spi_msg array and send all messages at once */
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int32_t (*transfer)(struct spi_desc *, struct spi_msg *, uint32_t);
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/** SPI remove function pointer */
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int32_t (*remove)(struct spi_desc *);
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};
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/******************************************************************************/
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/************************ Functions Declarations ******************************/
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/******************************************************************************/
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/* Initialize the SPI communication peripheral. */
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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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/* Free the resources allocated by spi_init(). */
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int32_t spi_remove(struct spi_desc *desc);
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/* Write and read data to/from SPI. */
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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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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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/* Iterate over the spi_msg array and send all messages at once */
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int32_t spi_transfer(struct spi_desc *desc,
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struct spi_msg *msgs,
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uint32_t len);
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#endif // _SPI_H_
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