/*********************************************************************************
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* Copyright: (C) 2018 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: sht20.c
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* Description: This file is temperature and relative humidity sensor SHT20 code
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*
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* Version: 1.0.0(2018/10/14)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "2018/10/14 12:13:26"
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*
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********************************************************************************/
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#ifndef __SHT20_H
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#define __SHT20_H
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#include <stdint.h>
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#include <time.h>
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#define SOFTRESET 0xFE
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#define TRIGGER_TEMPERATURE_NO_HOLD 0xF3
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#define TRIGGER_HUMIDITY_NO_HOLD 0xF5
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//#define I2C_API_IOCTL /* Use I2C userspace driver ioctl API */
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#define I2C_API_RDWR /* Use I2C userspace driver read/write API */
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void sht2x_term(void);
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int sht2x_init(void);
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int sht2x_get_serialnumber(uint8_t *serialnumber, int size);
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int sht2x_get_temp_humidity(float *temp, float *rh);
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static inline void msleep(unsigned long ms)
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{
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struct timespec cSleep;
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unsigned long ulTmp;
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cSleep.tv_sec = ms / 1000;
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if (cSleep.tv_sec == 0)
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{
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ulTmp = ms * 10000;
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cSleep.tv_nsec = ulTmp * 100;
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}
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else
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{
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cSleep.tv_nsec = 0;
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}
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nanosleep(&cSleep, 0);
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}
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static inline void dump_buf(const char *prompt, uint8_t *buf, int size)
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{
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int i;
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if( !buf )
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{
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return ;
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}
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if( prompt )
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{
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printf("%s ", prompt);
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}
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for(i=0; i<size; i++)
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{
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printf("%02x ", buf[i]);
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}
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printf("\n");
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return ;
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}
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#endif
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