/**********************************************************************
*Filename : spi_test.c
*Purpose  : this file sends a byte data and recieves a signle byte.
***********************************************************************/

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



void spi_init(int fd)
{
	uint8_t tx=0xdd;
	uint8_t rx=10;
	int ret;
	struct spi_ioc_transfer xfer;
	
	xfer.tx_buf= (unsigned long)&tx;
	xfer.rx_buf= (unsigned long)&rx;
	xfer.len = 1;
	xfer.bits_per_word = 8;
	xfer.speed_hz = 1000000;
	//xfer.cs_change = 0;	

	ret=ioctl(fd,SPI_IOC_MESSAGE(1),&xfer);
       	if(ret < 1){
		perror("Error while sending spi_messages");
		exit(1);
	}
	
	printf("rx:%x\n",rx);
};



int main()
{
	int fd;
	fd=open("/dev/spidev1.0",O_RDWR);
	if(fd<0){
		perror("Not able to open device file");
		return -1;
	}
while(1)
	spi_init(fd);
	return 0;
}

#include "mbed.h"

//SPI Slave
SPISlave device(PA_7,PA_6,PA_5,PA_4); // mosi, miso, sclk, ssel
Serial pc(SERIAL_TX,SERIAL_RX); 
 
int main() 
{     
     device.format(8,0);
     device.frequency(1000000);
     printf("Program Starting\r\n");
     device.reply(0x00);              // Prime SPI with first reply
     while(1) {
         if(device.receive()) {
             if(!ss){
             int v = device.read();   // Read byte from master     // Add one to it, modulo 256
             device.reply(v); 
             printf("Read 0x%x Reply 0x%x",v,v);
            }
        }
     }
}