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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