/*********************************************************************************
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* Copyright: (C) 2019 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: spidev.h
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* Description: This file is spidev user space API.
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*
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* Version: 1.0.0(2019年08月19日)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2019年08月19日 23时18分54秒"
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*
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********************************************************************************/
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#ifndef _SPIDEV_H_
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#define _SPIDEV_H_
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#include <stdint.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <linux/ioctl.h>
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#include <sys/stat.h>
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#include <linux/types.h>
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#include <linux/spi/spidev.h>
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#define DEVNAME_LEN 64
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#define DEF_SPI_BPW 8 /* bits per word */
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#define DEF_SPI_SPEED 500 /* unit kHZ */
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#define DEF_SPI_MODE SPI_CPHA
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//#define SPI_DEBUG
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#ifdef SPI_DEBUG
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#define spi_dbg(format,args...) printf(format, ##args)
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#else
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#define spi_dbg(format,args...) do{} while(0);
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#endif
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typedef struct spidev_s
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{
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char devname[DEVNAME_LEN];
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int fd;
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uint8_t bits; /* bits per word */
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uint32_t speed; /* max speed in HZ */
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uint32_t delay; /* delay usecs */
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/* mode: SPI_CPHA,SPI_CPOL => <SPI_MODE_0,SPI_MODE_1,SPI_MODE_2,SPI_MODE_3>
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* SPI_CS_HIGH | SPI_LSB_FIRST | SPI_3WIRE | SPI_LOOP | SPI_NO_CS
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* | SPI_READY | SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD */
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uint32_t mode;
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} spidev_t;
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/* initialise and open spidev context
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* NOTE: $speed unit is KHz
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*/
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extern int spi_init(spidev_t *spi, char *spidev, uint8_t bpw, uint32_t speed, uint32_t delay, uint32_t mode);
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/* read size bytes from SPI slave */
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extern int spi_read(spidev_t *spi, char *buf, int size);
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/* write nbytes to SPI slave */
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extern int spi_write(spidev_t *spi, char *data, int nbytes);
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/* write nbytes and read nbytes to/from SPI slave */
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extern int spi_rdwr(spidev_t *spi, char *data, char *rbuf, int nbytes);
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/* terminate and close spidev context */
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extern int spi_term(spidev_t *spi);
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#endif /* ----- #ifndef _SPIDEV_H_ ----- */
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