#include <unistd.h> //i2c
#include <sys/ioctl.h>
#include <linux/i2c-dev.h>
#include <i2c/smbus.h>
#include <stdio.h>

#include "htu21d.h"

//i2cReset
int i2cReset(int fd){
	if(ioctl(fd, I2C_SLAVE, ADDR)<0){
		perror("Failed to open the I2C bus: reset\n");
		return -1;
	}
	i2c_smbus_write_byte(fd, RESET);
	return 0;
}

// get temp
int getTemp(int fd, double *temp){

	char buffer [3];
	__s32 response = i2c_smbus_read_i2c_block_data(fd, TEMP,3,buffer);
	if (response<0){
		perror("Failed to read temperature from sensor\n");
		return -1;
	}
	*temp = -46.85+175.72*(buffer[0]*256+buffer[1])/65536;
	return 0;
}

// get humidity