51驱动 SHT20库文件 .rar_51_51单片机_8051_sht20_sht20 51

#include "sht20.h" int TT,RH; bit SHTMeasureOverBit; unsigned int RealStat; // 温湿度测量时序控制 unsigned int RHcount_AS; //SHT20的湿度计数值 unsigned int ADCData_Rt; //SHT20的温度计数值 void SHT_CalcRHT() { RH=RHcount_AS*0.0190734863-60;//hum 参照SHT20方程 // cntarray[0]=ADCData_Rt*0.0268127441-468.5;//+MyEMBcfg.T_off;//temp 参照SHT20方程 TT=ADCData_Rt*0.0268127441-468.5;//temp 参照SHT20方程 if(pianyip_t == 1) { TT = TT -((Temperature_Temp%100)*10); } if(pianyip_t == 0) { TT = TT +(Temperature_Temp*10); } if(pianyi_h == 1) { RH = RH -((Humidity_Temp%100)*10); } if(pianyi_h == 0) { RH = RH +(Humidity_Temp*10); } } void SHT20_Init() // SHT 测量初始化 { S_Init(); SHTMeasureOverBit=0; RH=0; TT=0; RealStat=0; } //SHT IIC 接口 void S_Init(void) { S_SCL_1; S_Delay(); S_SDA_1; S_Delay(); } void S_Start(void) { // S_DIR_OUT; // P3M0 |=S_SDA; S_SDA_1; S_Delay(); S_SCL_1; S_Delay(); S_SDA_0; S_Delay(); S_SCL_0; } void S_Stop(void) { S_SDA_0; S_Delay(); S_SCL_1; S_Delay(); S_SDA_1; S_Delay(); } void S_ReceiveAck(void) { volatile int i=0; S_SCL_1; S_Delay(); while (S_SDA_IN== 0x01&&i<1005) { i++; } S_SCL_0; S_Delay(); } void S_Acknowledge(void) { S_SCL_0; S_Delay(); S_SDA_0; S_Delay(); S_SCL_1; S_Delay(); S_SCL_0; } void S_Nacknowledge(void) { S_SCL_0; S_Delay(); S_SDA_1; S_Delay(); S_SCL_1; S_Delay(); S_SCL_0; } void S_WriteByte(unsigned char WData) { int j; for (j=0; j<8; j++) { S_SCL_0; S_Delay(); if (((WData >> 7) & 0x01) == 0x01) { S_SDA_1; } else { S_SDA_0; } S_Delay(); S_SCL_1; S_Delay(); WData = WData << 1; } S_SCL_0;//用于接收ACK S_SDA_0; Delay_us(30); //Delay(8); } unsigned char S_ReadByte(void) { unsigned char i; unsigned char TempBit = 0; unsigned char TempData = 0; S_SDA_1; // S_DIR_IN; // P3M0 |=S_SDA; S_Delay(); for (i=0; i<8; i++) { S_Delay(); S_SCL_1; S_Delay(); if (S_SDA_IN == 0x01 ) /*sda==1*/ { TempBit = 1; } else { TempBit = 0; } S_Delay(); S_SCL_0; S_Delay(); S_Delay(); TempData = (TempData << 1) | TempBit; } //S_DIR_OUT; // P3M0 |=S_SDA ; S_SDA_1; S_Delay(); Delay_us(30); TempData=TempData; return(TempData); } void S_Delay(void) { unsigned int i; for(i=0;i<50;i++); /*用于调整CLK 脉冲宽度*/ } void S_MeasureTemp(void) //温度测量命令 { S_Start(); ////////////////////// //发送读命令 S_WriteByte(0x80); S_Delay(); //读取ACK S_ReceiveAck(); S_WriteByte(0xF3); // 非主机触发T测量 S_Delay(); S_Delay(); //读取ACK S_ReceiveAck(); } unsigned int S_Read_SHT20_Value(void) //读取SHT20 的温度或者湿度输出参数 { unsigned int temp = 0; char hi,lo; hi=0x00; lo=0x00; S_Start(); //读取T的测量结果 S_WriteByte(0x81); S_Delay(); //读取ACK S_ReceiveAck(); //读高字节 hi = S_ReadByte(); S_Delay(); //主机发送ACK S_Acknowledge(); //读低字节 lo = S_ReadByte(); S_Delay(); //主机发送NACK S_Nacknowledge(); //停止信号 S_Stop(); lo=lo&0xFC; temp =hi*256 + lo; return temp ; } void S_MeasureHum(void) //湿度度测量命令 { S_Start(); ////////////////////// //发送读命令 S_WriteByte(0x80); S_Delay(); //读取ACK S_ReceiveAck(); S_WriteByte(0xF5); // 非主机触发T测量 S_Delay(); S_Delay(); //读取ACK S_ReceiveAck(); } void Delay_us(unsigned int nValue)//微秒为单位，11.0592MHz为主时钟 { int nCount; int i; int j; nCount = 60000; for(i = nValue;i > 0;i--) { for(j = nCount;j > 0;j--); } return; }