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164 lines
4.6 KiB
C
164 lines
4.6 KiB
C
/**
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* \file
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*
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* \brief SPI related functionality declaration.
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*
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* Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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#ifndef _HPL_SPI_H_INCLUDED
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#define _HPL_SPI_H_INCLUDED
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#include <compiler.h>
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#include <utils.h>
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/**
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* \addtogroup hpl_spi HPL SPI
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*
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*@{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief SPI Dummy char is used when reading data from the SPI slave
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*/
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#define SPI_DUMMY_CHAR 0x1ff
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/**
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* \brief SPI message to let driver to process
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*/
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//@{
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struct spi_msg {
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/** Pointer to the output data buffer */
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uint8_t *txbuf;
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/** Pointer to the input data buffer */
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uint8_t *rxbuf;
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/** Size of the message data in SPI characters */
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uint32_t size;
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};
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//@}
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/**
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* \brief SPI transfer modes
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* SPI transfer mode controls clock polarity and clock phase.
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* Mode 0: leading edge is rising edge, data sample on leading edge.
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* Mode 1: leading edge is rising edge, data sample on trailing edge.
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* Mode 2: leading edge is falling edge, data sample on leading edge.
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* Mode 3: leading edge is falling edge, data sample on trailing edge.
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*/
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enum spi_transfer_mode {
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/** Leading edge is rising edge, data sample on leading edge. */
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SPI_MODE_0,
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/** Leading edge is rising edge, data sample on trailing edge. */
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SPI_MODE_1,
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/** Leading edge is falling edge, data sample on leading edge. */
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SPI_MODE_2,
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/** Leading edge is falling edge, data sample on trailing edge. */
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SPI_MODE_3
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};
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/**
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* \brief SPI character sizes
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* The character size influence the way the data is sent/received.
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* For char size <= 8 data is stored byte by byte.
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* For char size between 9 ~ 16 data is stored in 2-byte length.
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* Note that the default and recommended char size is 8 bit since it's
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* supported by all system.
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*/
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enum spi_char_size {
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/** Character size is 8 bit. */
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SPI_CHAR_SIZE_8 = 0,
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/** Character size is 9 bit. */
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SPI_CHAR_SIZE_9 = 1,
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/** Character size is 10 bit. */
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SPI_CHAR_SIZE_10 = 2,
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/** Character size is 11 bit. */
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SPI_CHAR_SIZE_11 = 3,
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/** Character size is 12 bit. */
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SPI_CHAR_SIZE_12 = 4,
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/** Character size is 13 bit. */
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SPI_CHAR_SIZE_13 = 5,
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/** Character size is 14 bit. */
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SPI_CHAR_SIZE_14 = 6,
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/** Character size is 15 bit. */
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SPI_CHAR_SIZE_15 = 7,
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/** Character size is 16 bit. */
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SPI_CHAR_SIZE_16 = 8
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};
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/**
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* \brief SPI data order
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*/
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enum spi_data_order {
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/** MSB goes first. */
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SPI_DATA_ORDER_MSB_1ST = 0,
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/** LSB goes first. */
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SPI_DATA_ORDER_LSB_1ST = 1
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};
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/** \brief Transfer descriptor for SPI
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* Transfer descriptor holds TX and RX buffers
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*/
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struct spi_xfer {
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/** Pointer to data buffer to TX */
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uint8_t *txbuf;
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/** Pointer to data buffer to RX */
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uint8_t *rxbuf;
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/** Size of data characters to TX & RX */
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uint32_t size;
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};
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/** SPI generic driver. */
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struct spi_dev {
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/** Pointer to the hardware base or private data for special device. */
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void *prvt;
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/** Reference start of sync/async variables */
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uint32_t sync_async_misc[1];
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};
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/**
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* \brief Calculate the baudrate value for hardware to use to set baudrate
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* \param[in, out] dev Pointer to the SPI device instance.
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* \param[in] clk Clock frequency (Hz) for baudrate generation.
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* \param[in] baud Target baudrate (bps).
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* \return Error or baudrate value.
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* \retval >0 Baudrate value.
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* \retval ERR_INVALID_ARG Calculation fail.
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*/
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int32_t _spi_calc_baud_val(struct spi_dev *dev, const uint32_t clk, const uint32_t baud);
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#ifdef __cplusplus
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}
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#endif
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/**@}*/
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#endif /* ifndef _HPL_SPI_H_INCLUDED */
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