#include <stdint.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>



 
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

static uint8_t WRSPIMode = 0;
static uint8_t RDSPIMode = 0;
static uint8_t SPIbit = 8;
static uint32_t SPISpeed = 1000000;
static char *SPIDevice = "/dev/spidev0.0"; 


int main(int argc,char *argv[]){
	
	int fd,ret=0;
	uint8_t tx[2];
	uint8_t rx[2];
	
		
	fd = open(SPIDevice,O_RDWR);
	if(fd<0) printf("SPI couldn't open\n");

	ret = ioctl(fd,SPI_IOC_WR_MODE,&WRSPIMode);
	if(ret <0) printf("SPI write Mode error\n");

	ret = ioctl(fd,SPI_IOC_RD_MODE,&RDSPIMode);
	if(ret <0) printf("SPI read Mode error\n");

	ret =ioctl(fd,SPI_IOC_WR_BITS_PER_WORD,&SPIbit);
	if(ret <0) printf("SPI write bit/Word error\n");

	ret =ioctl(fd,SPI_IOC_RD_BITS_PER_WORD,&SPIbit);
	if(ret <0) printf("SPI read bit/Word error \n");

	ret =ioctl(fd,SPI_IOC_WR_MAX_SPEED_HZ,&SPISpeed);
	if(ret <0) printf("SPI write Speed init error\n");

	ret =ioctl(fd,SPI_IOC_RD_MAX_SPEED_HZ,&SPISpeed);
	if(ret <0) printf("SPI read Speed init error\n");
 	

	struct spi_ioc_transfer tr={
		tr.tx_buf			=(unsigned long)tx,
		tr.rx_buf			=(unsigned long)rx,
		tr.len				=ARRAY_SIZE(tx),
		tr.delay_usecs	=0,
		tr.speed_hz		=SPISpeed,
		tr.bits_per_word=SPIbit,
	};

	///WRITE///
	tx[0]=0x00; //address bit PORT0
	tx[1]=0x11; //data bit
	ret=ioctl(fd,SPI_IOC_MESSAGE(1),&tr);
	if(ret <1) printf("SPI transfer error\n");

	tx[0]=0x08; //address bit  PORT1
	tx[1]=0x22; //data bit 
	ret=ioctl(fd,SPI_IOC_MESSAGE(1),&tr);
	if(ret <1) printf("SPI transfer error\n");

   	tx[0]=0x10; //address bit  PORT2
	tx[1]=0x33; //data bit
	ret=ioctl(fd,SPI_IOC_MESSAGE(1),&tr);
	if(ret <1) printf("SPI transfer error\n");

	tx[0]=0x18; //address bit  PORT3
	tx[1]=0x44; //data bit
	ret=ioctl(fd,SPI_IOC_MESSAGE(1),&tr);
	if(ret <1) printf("SPI transfer error\n");

	


	return 0;
}