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sht11程序
include AT89s53.h //Microcontroller specific library, e.g. port definitions #include intrins.h //Keil library (is used for _nop()_ operation) #include math.h //Keil library #include stdio.h //Keil library typedef union { unsigned int i; float f; } value; //---------------------------------------------------------------------------------- // modul-var //---------------------------------------------------------------------------------- enum {TEMP,HUMI}; #define DATA P1_1 #define SCK P1_0 #define noACK 0 #define ACK 1 //adr command r/w #define STATUS_REG_W 0x06 //000 0011 0 #define STATUS_REG_R 0x07 //000 0011 1 #define MEASURE_TEMP 0x03 //000 0001 1 #define MEASURE_HUMI 0x05 //000 0010 1 #define RESET 0x1e //000 1111 0 //---------------------------------------------------------------------------------- char s_write_byte(unsigned char value) //---------------------------------------------------------------------------------- // writes a byte on the Sensibus and checks the acknowledge { unsigned char i,error=0; for (i=0x80;i0;i/=2) //shift bit for masking { if (i value) DATA=1; //masking value with i , write to SENSI-BUS else DATA=0; SCK=1; //clk for SENSI-BUS _nop_();_nop_();_nop_(); //pulswith approx. 5 us SCK=0; } DATA=1; //release DATA-line SCK=1; //clk #9 for ack error=DATA; //check ack (DATA will be pulled down by SHT11) SCK=0; return error; //error=1 in case of no acknowledge } //---------------------------------------------------------------------------------- char s_read_byte(unsigned char ack) //---------------------------------------------------------------------------------- // reads
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