不加7221的程序前，仿真能够正常运行，能够显示温湿度的数值，加入7221程序之后，lcd的温湿度没有显示数值，而且while（1）循环跳出了。程序如下：
仿真只能到这
#include <reg52.h>
#include <intrins.h>
#include <stdio.h>
#include <string.h>
#include <absacc.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int
//fengshan
uchar wdtemp[7];
uchar sdtemp[7];
//sbit fs=P3^0;
//uint sdsheding=26;
//uchar fstemp;
//void fsxiugai()
//{
// if(sdsheding!=fstemp)
// {
// fs=0;
// }
//}
//****************************键盘扫描*******************
//******************************数码管显示***************************************
sbit DIN = P1^5; //数据串出引脚
sbit CS = P1^7; //片选端
sbit CLK = P1^6; //移位时钟端
unsigned char disp_buff[8];
//写数据函数
void write_data(unsigned char addr,unsigned char dat)
{
unsigned char j;
CS = 0; // 先写地址，片选置低，串行数据加载到移位寄存器
for(j = 0;j < 8;j++) //
{
CLK = 0; //时钟上升沿数据移入内部移位寄存器
addr <<= 1; //待发送的地址，每次左移一次，高位在前发送，
DIN = CY; //数据移位后，如果有溢出，则可以从进位位CY中获得溢出的数据位
CLK = 1;
_nop_();
_nop_();
CLK = 0; //下降沿时数据从DOUT移出
}
for(j = 0;j < 8;j++)
{
CLK = 0; //
dat <<= 1; //发送数据
DIN = CY;
CLK = 1;
_nop_();
_nop_();
CLK = 0;
}
CS = 1; //CS上升沿，数据锁存
}
//初始化函数
void init_max7221(void)
{
write_data(0x09,0xff); //编码模式
write_data(0x0a,0x07); //亮度控制
write_data(0x0b,0x07); //扫描数码管的位数
write_data(0x0c,0x01); //工作模式
}
// 延时函数
void delayms(unsigned int x)
{
unsigned char i;
while(x--)
{
for(i=0;i<120;i++);
}
}
//**********数码管 END****************************
//1602液晶端口定义 ******
sbit LcdRs= P2^0;
sbit LcdRw= P2^1;
sbit LcdEn= P2^2;
sbit ACC0 = ACC^0;
sbit ACC7 = ACC^7;
uchar str[7];
//向LCD写入命令或数据************************************************************
#define LCD_COMMAND 0 // Command
#define LCD_DATA 1 // Data
#define LCD_CLEAR_SCREEN 0x01 // 清屏
#define LCD_HOMING 0x02 // 光标返回原点
//设置显示模式************************************************************
#define LCD_SHOW 0x04 //显示开
#define LCD_HIDE 0x00 //显示关
#define LCD_CURSOR 0x02 //显示光标
#define LCD_NO_CURSOR 0x00 //无光标
#define LCD_FLASH 0x01 //光标闪动
#define LCD_NO_FLASH 0x00 //光标不闪动
//设置输入模式************************************************************
#define LCD_AC_UP 0x02
#define LCD_AC_DOWN 0x00 // default
#define LCD_MOVE 0x01 // 画面可平移
#define LCD_NO_MOVE 0x00 //default
unsigned char LCD_Wait(void);
void LCD_Write(bit style, unsigned char input);
/***********1602液晶显示部分子程序****************/
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void LCD_Write(bit style, unsigned char input)
{
LcdRs=style;
P0=input;
delay(5);
LcdEn=1;
delay(5);
LcdEn=0;
}
void LCD_SetDisplay(unsigned char DisplayMode)
{
LCD_Write(LCD_COMMAND, 0x08|DisplayMode);
}
void LCD_SetInput(unsigned char InputMode)
{
LCD_Write(LCD_COMMAND, 0x04|InputMode);
}
//初始化LCD************************************************************
void LCD_Initial()
{
LcdEn=0;
LCD_Write(LCD_COMMAND,0x38); //8位数据端口,2行显示,5*7点阵
LCD_Write(LCD_COMMAND,0x38);
LCD_SetDisplay(LCD_SHOW|LCD_NO_CURSOR); //开启显示, 无光标
LCD_Write(LCD_COMMAND,LCD_CLEAR_SCREEN); //清屏
LCD_SetInput(LCD_AC_UP|LCD_NO_MOVE); //AC递增, 画面不动
}
//液晶字符输入的位置************************
void GotoXY(unsigned char x, unsigned char y)
{
if(y==0)
LCD_Write(LCD_COMMAND,0x80|x);
if(y==1)
LCD_Write(LCD_COMMAND,0x80|(x-0x40));
}
//将字符输出到液晶显示
void Print(unsigned char *str)
{
while(*str!='\0')
{
LCD_Write(LCD_DATA,*str);
str++;
}
}
void zhuanhuanwd(float a)//wd浮点数转换成字符串函数
{
unsigned char m;
memset(str,0,sizeof(str));
sprintf (str,"%f",a);
for(m=0;m<5;m++)
{wdtemp[m]=str[m];}
}
void zhuanhuansd(float a)//sd浮点数转换成字符串函数
{
unsigned char m;
memset(str,0,sizeof(str));
sprintf (str,"%f",a);
for(m=0;m<5;m++)
{sdtemp[m]=str[m];}
}
void welcome()
{
LCD_Initial();
GotoXY(0,0);
Print(" Welcome! ");
GotoXY(0,1);
Print(" Code of sht10 ");
delay(200);
}
/*--------------------------------------
;模块名称:delay_n10us();
;功 能:延时函数，延时约n个10us
较精确的延时函数,"_nop_()"延时1us@12M晶振
;-------------------------------------*/
void delay_n10us(uint n) //延时n个10us@12M晶振
{
uint i;
for(i=n;i>0;i--)
{
_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();
}
}
//*********************第一部分LCD1602设置 END****************************************
//*********************第二部分SHT10设置 START****************************************
sbit SCK = P1^0; //定义通讯时钟端口
sbit DATA = P1^1; //定义通讯数据端口
typedef union
{ unsigned int i; //定义了两个共用体
float f;
} value;
enum {TEMP,HUMI}; //TEMP=0,HUMI=1
#define noACK 0 //用于判断是否结束通讯
#define ACK 1 //结束数据传输
//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
/****************定义函数****************/
void s_transstart(void); //启动传输函数
void s_connectionreset(void); //连接复位函数
char s_write_byte(unsigned char value);//SHT10写函数
char s_read_byte(unsigned char ack); //SHT10读函数
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);//测量温湿度函数
void calc_sht10(float *p_humidity ,float *p_temperature);//温湿度补偿
/*--------------------------------------
;模块名称:s_transstart();
;功 能:启动传输函数
;-------------------------------------*/
void s_transstart(void)
// generates a transmission start
// _____ ________
// DATA: |_______|
// ___ ___
// SCK : ___| |___| |______
{
DATA=1; SCK=0; //Initial state
_nop_();
SCK=1;
_nop_();
DATA=0;
_nop_();
SCK=0;
_nop_();_nop_();_nop_();
SCK=1;
_nop_();
DATA=1;
_nop_();
SCK=0;
}
/*--------------------------------------
;模块名称:s_connectionreset();
;功 能:连接复位函数
;-------------------------------------*/
void s_connectionreset(void)
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________ ________
// DATA: |_______|
// _ _ _ _ _ _ _ _ _ ___ ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
{
unsigned char n;
DATA=1; SCK=0; //Initial state
for(n=0;n<9;n++) //9 SCK cycles
{
SCK=1;
SCK=0;
}
s_transstart(); //transmission start
}
/*--------------------------------------
;模块名称:s_write_byte();
;功 能:SHT10写函数
;-------------------------------------*/
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;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
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
}
DATA=1; //release DATA-line
SCK=1; //clk #9 for ack
error=DATA; //check ack (DATA will be pulled down by DHT90),DATA在第9个上升沿将被DHT90自动下拉为低电平。
_nop_();_nop_();_nop_();
SCK=0;
DATA=1; //release DATA-line
return error; //error=1 in case of no acknowledge //返回：0成功，1失败
}
/*--------------------------------------
;模块名称:s_read_byte();
;功 能:SHT10读函数
;-------------------------------------*/
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
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
}
if(ack==1)DATA=0; //in case of "ack==1" pull down DATA-Line
else DATA=1; //如果是校验(ack==0)，读取完后结束通讯
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=1; //clk #9 for ack
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
SCK=0;
_nop_();_nop_();_nop_(); //pulswith approx. 3 us
DATA=1; //release DATA-line
return val;
}
/*--------------------------------------
;模块名称:s_measure();
;功 能:测量温湿度函数
;-------------------------------------*/
char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
// makes a measurement (humidity/temperature) with checksum
{
unsigned 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)
*p_checksum =s_read_byte(noACK); //read checksum
return error;
}
/*--------------------------------------
;模块名称:calc_sht10();
;功 能:温湿度补偿函数
;-------------------------------------*/
void calc_sht10(float *p_humidity ,float *p_temperature)
// calculates temperature [C] and humidity [%RH]
// input : humi [Ticks] (12 bit)
// temp [Ticks] (14 bit)
// output: humi [%RH]
// temp [C]
{ 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 [C]
t_C=t*0.01 - 40; //calc. temperature from ticks to [C]
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 [C]
*p_humidity=rh_true; //return humidity[%RH]
}
//*********************第二部分SHT10设置 END****************************************
//*********主函数*****************
void main(void)
{
value humi_val,temp_val;
unsigned char error,checksum,k;
init_max7221(); // 初始化
delayms(2);
for(k = 0;k < 8;k++)
{
write_data(k+1,disp_buff[k]); // 显示8位
}
LcdRw=0;
s_connectionreset();
welcome();//显示欢迎画面
delay(200);
LCD_Initial();
while(1)
{
error=0;
error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI); //measure humidity
error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP); //measure temperature
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_sht10(&humi_val.f,&temp_val.f); //计算湿度与温度
GotoXY(0,0);//
Print("Tep:");
GotoXY(0,1);
Print("Hum:");
zhuanhuanwd(temp_val.f);//转换温度为uchar方便液晶显示
GotoXY(5,0);
str[5]=0xDF;//℃的符号
str[6]=0x43;
str[7]='\0';
Print(str);
zhuanhuansd(humi_val.f);//转换湿度为uchar方便液晶显示
GotoXY(5,1);
str[5]='%';//%的符号
str[6]='\0';//字符串结束标志
Print(str);
}
//----------wait approx. 0.8s to avoid heating up SHT10------------------------------
delay_n10us(80000); //延时约0.8s
}
}
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