使用模拟I2C读取TMP75温度源码

#include "TMP75.h" #if 1 /*UINT8 SearchDev(UINT8 add) { UINT8 ret; I2C_Start(); ret=I2C_SendByte(add|I2C_READ); I2C_Stop(); Delay_ms(10); return ret; } UINT8 SearchTMP75(void) { UINT8 dev=0; if(SearchDev(DEV1ADD)==0) dev|=0x01; if(SearchDev(DEV2ADD)==0) dev|=0x02; if(SearchDev(DEV3ADD)==0) dev|=0x04; if(SearchDev(DEV4ADD)==0) dev|=0x08; return dev; }*/ /*************************************************** 温度值格式转换，考虑两位小数点 ****************************************************/ INT8 TemConversion(UINT16 indata,INT16* outdata) { if((indata>0x7FF)&&(indata<0xC90))//不在温度范围 { return 1; } if(indata<=0x7FF) { if(indata<0x190) { *outdata=(25000/0x190)*indata; *outdata=*outdata/10; } else if(indata<0x320) { *outdata=(25000/(0x320-0x190))*(indata-0x190); *outdata=*outdata/10+25*100; } else if(indata<0x4B0) { *outdata=(25000/(0x4B0-0x320))*(indata-0x320); *outdata=*outdata/10+50*100; } else if(indata<0x500) { *outdata=(5000/(0x500-0x4B0))*(indata-0x4B0); *outdata=*outdata/10+75*100; } else if(indata<0x640) { *outdata=(20000/(0x640-0x500))*(indata-0x500); *outdata=*outdata/10+80*100; } else { *outdata=(28000/(0x7FF-0x640))*(indata-0x640); *outdata=*outdata/10+100*100; } } else { if(indata>0xE70) { *outdata=(25000/(0xFFF-0xE70))*(indata-0xE70); *outdata=*outdata/10; } else { *outdata=(30000/(0xE70-0xC90))*(indata-0xC90); *outdata=*outdata/10+25*100; } *outdata|=0x8000; } return 0; } INT8 TMP75_ReadTenperature(UINT8 add,INT16* temdata) { INT8 ret; UINT8 rdata; UINT16 readdata=0; I2C_Start(); ret=I2C_SendByte(add|I2C_WRITE); if(ret!=0) { I2C_Stop(); return 1; } ret=I2C_SendByte(TEMREGISTER); if(ret!=0) { I2C_Stop(); return 2; } Delay_ms(30); I2C_Start(); ret=I2C_SendByte(add|I2C_READ); if(ret!=0) { I2C_Stop(); return 3; } rdata=I2C_RcvByte(); I2C_SendACk(); readdata=I2C_RcvByte(); I2C_SendACk(); I2C_Stop(); readdata=readdata>>4; readdata|=rdata*0x10; ret=TemConversion(readdata,temdata); if(ret!=0) { return 4; } return 0; } #endif