下面的是我的一个程序,可温湿度的值出来的是乱码,不知道哪儿有错误,请高手们帮我指点一下了!!谢谢!
//12864并行接口参考程序,控制器st7920 #include <reg51.h> #include <intrins.h> #include <math.h> #include <stdio.h> #define uchar unsigned char #define uint unsigned int #define LcdData P0 //12864 汉字显示模块 与MCU连接 sbit RS = P2^0;// 1:输入数据 ;0:输入命令 sbit RW = P2^1;//1:读数据 0:写数据 sbit E = P2^2;
typedef union { unsigned int i; float f; } value;
//---------------------------------------------------------------------------------- // modul-var //---------------------------------------------------------------------------------- enum {TEMP,HUMI};
sbit DATA = P1^0; sbit SCK = P1^1;
#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
//延时子程序 void delay(unsigned int t) { unsigned int i,j; for(i=0;i<t;i++) for(j=0;j<100;j++); } ///========================12864显示部分============================ //测试LCD忙 bit Check_Busy() { bit busy; RS = 0; RW = 1; E = 1; _nop_(); busy = (bit)(LcdData&0x80); E = 0; return 0; } //等待LCD到空闲 void wait() { while(Check_Busy()); } //写数据 void Lcd_Writedata(unsigned char dispdata) { wait(); RS=1; RW=0; E=0; _nop_(); _nop_(); LcdData=dispdata; E=1; _nop_(); _nop_(); E=0; } //写指令代码 void Lcd_WriteCmd(unsigned char cmdcode) { wait(); RS=0; RW=0;
E=0; _nop_(); _nop_(); LcdData=cmdcode; _nop_(); _nop_(); E=1; _nop_(); _nop_(); E=0; } /*****************初始化LCD*******************************/ void Lcd_Init(void) { uchar cmd; cmd=0x30; //功能设置 8位数据,基本指令 Lcd_WriteCmd(cmd); //写指令 cmd=0x0C; //显示状态 ON,游标OFF,反白OFF Lcd_WriteCmd(cmd); //写指令 cmd=0x02; //地址归位 Lcd_WriteCmd(cmd); //写指令 cmd=0x80; //设置DDRAM地址 Lcd_WriteCmd(cmd); //写指令 cmd=0x06; Lcd_WriteCmd(cmd); //指定在资料的读取及写入时,设定游标的移动方向及指定显示的移位 delay(100); //延时 } /*****************清屏LCD *******************************/ void Lcd_Clr(void) { Lcd_WriteCmd(0x01); //清除显示 delay(100); delay(100); delay(100); }
/*****************设置汉字位置********************************/ void Char_Set_XY(uchar x, uchar y, uchar *p) { if(y == 0) {
Lcd_WriteCmd((0x80+x)); } if(y == 1) { Lcd_WriteCmd((0x90+x)); } if(y == 2) {
Lcd_WriteCmd((0x88+x)); } if(y == 3) {
Lcd_WriteCmd((0x98+x)); } while(*p != 0) { Lcd_Writedata(*p++); } }
//字符串显示 void WriteStr(unsigned char code *s) { while(*s>0) { Lcd_Writedata(*s); s++; } } void disp2() { Char_Set_XY(0,0,"温度上限:");
Char_Set_XY(0,1,"温度下限:");
Char_Set_XY(0,2,"湿度上限:");
Char_Set_XY(0,3,"湿度下限:"); }
//---------------------------------------------------------------------------------- char s_write_byte(unsigned char value) //---------------------------------------------------------------------------------- // writes a byte on the Sensibus and checks the acknowledge { unsigned char i, error=0;
unsigned char n;
for (i=0x80;i>0;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 for(n=0;n<10;n++) _nop_(); //pulswith approx. 5 us SCK=0; for(n=0;n<7;n++) _nop_(); } DATA=1; //release DATA-line
for(n=0;n<3;n++) _nop_(); SCK=1; //clk #9 for ack for(n=0;n<5;n++) _nop_(); error=DATA; //check ack (DATA will be pulled down by SHT11) for(n=0;n<5;n++) _nop_(); SCK=0;
return error; //error=1 in case of no acknowledge }
//---------------------------------------------------------------------------------- char s_read_byte(unsigned char ack) //---------------------------------------------------------------------------------- // reads a byte form the Sensibus and gives an acknowledge in case of "ack=1" { unsigned char i,val=0; DATA=1; //release DATA-line for (i=0x80;i>0;i/=2) //shift bit for masking { SCK=1; //clk for SENSI-BUS if (DATA) val=(val | i); //read bit SCK=0; } DATA=!ack; //in case of "ack==1" pull down DATA-Line SCK=1; //clk #9 for ack _nop_();_nop_();_nop_(); //pulswith approx. 5 us SCK=0; DATA=1; //release DATA-line return val; }
//---------------------------------------------------------------------------------- void s_transstart(void) //---------------------------------------------------------------------------------- // generates a transmission start // _____ ________ // DATA: |_______| // ___ ___ // SCK : ___| |___| |______ { int n;
DATA=1; SCK=0; //Initial state for(n=0;n<5;n++)_nop_(); SCK=1; for(n=0;n<5;n++)_nop_(); DATA=0; for(n=0;n<5;n++)_nop_(); SCK=0; for(n=0;n<5;n++)_nop_();_nop_();_nop_(); SCK=1; for(n=0;n<5;n++)_nop_(); DATA=1; for(n=0;n<5;n++)_nop_(); SCK=0; for(n=0;n<5;n++)_nop_(); }
//---------------------------------------------------------------------------------- void s_connectionreset(void) //---------------------------------------------------------------------------------- // communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart // _____________________________________________________ ________ // DATA: |_______| // _ _ _ _ _ _ _ _ _ ___ ___ // SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______ { unsigned char i; int n;
DATA=1; SCK=0; //Initial state for(i=0;i<9;i++) //9 SCK cycles { SCK=1; for(n=0;n<10;n++)_nop_(); SCK=0; for(n=0;n<5;n++)_nop_(); } for(n=0;n<5;n++)_nop_(); s_transstart(); //transmission start }
//---------------------------------------------------------------------------------- char s_softreset(void) //---------------------------------------------------------------------------------- // resets the sensor by a softreset { unsigned char error=0; s_connectionreset(); //reset communication error+=s_write_byte(RESET); //send RESET-command to sensor return error; //error=1 in case of no response form the sensor }
//---------------------------------------------------------------------------------- char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode) //---------------------------------------------------------------------------------- // makes a measurement (humidity/temperature) with checksum { unsigned int error=0; unsigned int i;
s_transstart(); //transmission start switch(mode){ //send command to sensor case TEMP : error+=s_write_byte(MEASURE_TEMP); break; case HUMI : error+=s_write_byte(MEASURE_HUMI); break; default : break; } for (i=0;i<65535;i++) if(DATA==0) break; //wait until sensor has finished the measurement if(DATA) error+=1; // or timeout (~2 sec.) is reached *(p_value) =s_read_byte(ACK); //read the first byte (MSB) *(p_value+1)=s_read_byte(ACK); //read the second byte (LSB)
// printf("\ndata1=%x, data2=%x\n", *(p_value), *(p_value+1));
*p_checksum =s_read_byte(noACK); //read checksum return error; }
//---------------------------------------------------------------------------------- void init_uart() //---------------------------------------------------------------------------------- //9600 bps @ 11.059 MHz {SCON = 0x52; TMOD = 0x20; TCON = 0x69; TH1 = 0xfd; }
//---------------------------------------------------------------------------------------- void calc_sth11(float *p_humidity ,float *p_temperature) //---------------------------------------------------------------------------------------- // calculates temperature [癈] and humidity [%RH] // input : humi [Ticks] (12 bit) // temp [Ticks] (14 bit) // output: humi [%RH] // temp [癈] { const float C1=-4.0; // for 12 Bit const float C2=+0.0405; // for 12 Bit const float C3=-0.0000028; // for 12 Bit const float T1=+0.01; // for 14 Bit @ 5V const float T2=+0.00008; // for 14 Bit @ 5V
float rh=*p_humidity; // rh: Humidity [Ticks] 12 Bit float t=*p_temperature; // t: Temperature [Ticks] 14 Bit float rh_lin; // rh_lin: Humidity linear float rh_true; // rh_true: Temperature compensated humidity float t_C; // t_C : Temperature [癈]
t_C=t*0.01 - 40; //calc. temperature from ticks to [癈] rh_lin=C3*rh*rh + C2*rh + C1; //calc. humidity from ticks to [%RH] rh_true=(t_C-25)*(T1+T2*rh)+rh_lin; //calc. temperature compensated humidity [%RH] if(rh_true>100)rh_true=100; //cut if the value is outside of if(rh_true<0.1)rh_true=0.1; //the physical possible range
*p_temperature=t_C; //return temperature [癈] *p_humidity=rh_true; //return humidity[%RH] }
//---------------------------------------------------------------------------------- void main() //---------------------------------------------------------------------------------- // sample program that shows how to use SHT11 functions // 1. connection reset // 2. measure humidity [ticks](12 bit) and temperature [ticks](14 bit) // 3. calculate humidity [%RH] and temperature [癈] // 4. calculate dew point [癈] // 5. print temperature, humidity, dew point
{ value humi_val,temp_val; float dew_point; unsigned char error,checksum; unsigned int i;
init_uart();
s_connectionreset(); Lcd_Clr(); Lcd_Init(); //初始化LCD //Char_Set_XY(2, 1, "初始化成功"); delay(1000);
while(1) { error=0; error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
//printf("humi:%dC \n",humi_val.i);
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
// printf("temp:%dC \n",temp_val.i);
if(error!=0) s_connectionreset(); //in case of an error: connection reset else { //humi_val.f=(float)humi_val.i; //converts integer to float temp_val.f=(float)temp_val.i; //converts integer to float calc_sth11(&humi_val.f,&temp_val.f); //calculate humidity, temperature // dew_point=calc_dewpoint(humi_val.f,temp_val.f); //calculate dew point //printf("temp:%5.1fC \n",temp_val.f); Lcd_WriteCmd(0x98); Lcd_WriteDat(*temp_va1.f) ; // Char_Set_XY(1,2,&temp_val.f ); } //----------wait approx. 0.8s to avoid heating up SHTxx------------------------------ for (i=0;i<40000;i++); //(be sure that the compiler doesn't eliminate this line!) //----------------------------------------------------------------------------------- } }
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