Bitbang MLX90316 on SPI1

bitbangspi.c

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <stdint.h>
#include <math.h>

#include "pigpio.h"

/*
gcc -o bitbangspi bitbangspi.c -lpigpio -lrt -lpthread
sudo ./bitbangspi

*/
#define CE0  26
#define MISO 19
#define MOSI 20
#define SCLK 21

int main(int argc, char *argv[])
{
   int i, count, set_val, read_val;
   unsigned char inBuf[1];
   char cmd1[] = {0x55};
   char cmd2[] = {0};
   uint16_t val;

   if (gpioInitialise() < 0)
   {
      fprintf(stderr, "pigpio initialisation failed.\n");
      return 1;
   }

   gpioWrite(18, 1);

   bbSPIOpen(CE0, MISO, MOSI, SCLK, 250000, 0); 

   while (1) {

      val = 0;
      gpioWrite(18, 0);
      usleep(2);
      count = bbSPIXfer(CE0, cmd1, (char *)inBuf, 1);
      usleep(1);
      count = bbSPIXfer(CE0, cmd2, (char *)inBuf, 1); 
      usleep(1);
      count = bbSPIXfer(CE0, cmd2, (char *)inBuf, 1); 
      usleep(1);
      val = ( inBuf[0] << 8 );
      count = bbSPIXfer(CE0, cmd2, (char *)inBuf, 1);
      val = val | inBuf[0];
      printf("0x%04x\n", val);
      usleep(3);
      gpioWrite(18, 1);

      usleep(300);

   }

   bbSPIClose(CE0);

   gpioTerminate();

   return 0;
}