A Banana Pro Weather Logger

/*///////////////////////////////////////////////////////////////////////
/ get-w-data.c RM20190422                                               /
/ Used to poll weather data on LeoStick via I2C. Program used to return /
/ in a comma delimitd line for use in a .csv file.                      /
///////////////////////////////////////////////////////////////////////*/
include <string.h>
include <unistd.h>
include <errno.h>
include <stdio.h>
include <stdlib.h>
include <linux/i2c-dev.h>
include <sys/ioctl.h>
include <fcntl.h>
include <unistd.h>
// BananaPro I2C address.
#define ADDRESS 04
// The I2C bus for the BananaPro is /dev/i2c-1.
static const char *devName = "/dev/i2c-1";

int main(int argc, char** argv) {
   // Provide a small delay between LeoStcick I2C comms with sensors 
   // and Banana Pro I2C comms with LeoStck.
   usleep(2000);

	int file;
   file = open(devName, O_RDWR); 
   ioctl(file, I2C_SLAVE, ADDRESS);
   int command;

	for (command= 1; command<=4; command++){
   	unsigned char cmd[16];
		cmd[0] = command;
   	if (write(file, cmd, 1) == 1){
	   	char buf[6];
	    	//read 4 bytes from i2c
	   	if (read(file, buf, 4) == 4){
	   		volatile float value_received;
				// convert 4 bytes received into a float
				memcpy((char*)&value_received,buf,5);  
				if (command==1){ 
					printf("%.2f,", value_received);
				}
    			if (command==2){
    		   	printf("%.2f,", value_received);
				}
    			if (command==3){
    		   	printf("%.2f,", value_received);
    			}

    			if (command==4){
    		   	printf("%.2f\n", value_received);
    			}
    		}
    	}
	}
return (0);
}