/*********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  sht20.c
 *    Description:  This file is temperature and relative humidity sensor SHT20 code
 *                 
 *        Version:  1.0.0(2018/10/14)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2018/10/14 12:13:26"
 *                 
 ********************************************************************************/
#ifndef __SHT20_H
#define __SHT20_H

#include <stdint.h>
#include <time.h>

#define SOFTRESET                        0xFE
#define TRIGGER_TEMPERATURE_NO_HOLD      0xF3
#define TRIGGER_HUMIDITY_NO_HOLD         0xF5

//#define I2C_API_IOCTL  /* Use I2C userspace driver ioctl API */
#define I2C_API_RDWR /* Use I2C userspace driver read/write API */

void sht2x_term(void);
int sht2x_init(void);
int sht2x_get_serialnumber(uint8_t *serialnumber, int size);
int sht2x_get_temp_humidity(float *temp, float *rh);
 
static inline void msleep(unsigned long ms) 
{
       	struct timespec cSleep;
       	unsigned long ulTmp;
       
	cSleep.tv_sec = ms / 1000;
       	if (cSleep.tv_sec == 0)
       	{   
		ulTmp = ms * 10000;
	       	cSleep.tv_nsec = ulTmp * 100;
       	}   
	else
       	{   
		cSleep.tv_nsec = 0;
       	}   
	
	nanosleep(&cSleep, 0); 
}

static inline void dump_buf(const char *prompt, uint8_t *buf, int size)
{
	int          i;

	if( !buf )
	{
		return ;
	}

	if( prompt )
	{
		printf("%s ", prompt);
	}

	for(i=0; i<size; i++)
	{
		printf("%02x ", buf[i]);
	}
	printf("\n");

	return ;
}

#endif