用STC12C5A32S2单片机驱动SHT11的程序
请问大家，有没有用过STC12C5A32S2单片机驱动SHT11温湿度传感器，如果有请大家帮小弟一个忙吧！小弟都弄了很长时间，也没有驱动成功，网上都是用51单片机驱动的，那些程序放在51单片机都好用我试了，但是放在STC12C5A32S2单片机就不对了，STC12C5A32S2单片机速度快，我也该程序了，怎么改也不对啊，着急死了，小弟恳求各位能帮上忙的帮一帮，指点一下它的时序应该延时多少，有程序最好了！首先感谢一下。下面是我从网上找到的程序，应该怎样改它的延时，各位高手请指点。
/*************端口定义********************
P1.0------SCK (SHT10)
P1.1------DATA (SHT10)
P0------DB0～DB7(LCD1602)
P2.0------RS (LCD1602)
P2.1------RW (LCD1602)
P2.2------E (LCD1602)
*****************************************/
#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
//1602液晶端口定义 ******
sbit LcdRs= P3^0;
sbit LcdRw= P3^1;
sbit LcdEn= P3^2;
sbitACC0 = ACC^0;
sbitACC7 = ACC^7;
uchar str;
//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 zhuanhuan(float a)//浮点数转换成字符串函数
{
memset(str,0,sizeof(str));
sprintf (str,"%f", a);
}
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DHT90设置 START****************************************
sbit SCK= P3^5; //定义通讯时钟端口
sbit DATA = P3^6; //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
//adrcommandr/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);//DHT90写函数
char s_read_byte(unsigned char ack); //DHT90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_dht90(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 i;
DATA=1; SCK=0; //Initial state
for(i=0;i<9;i++) //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_dht90();
;功 能:温湿度补偿函数
;-------------------------------------*/
void calc_dht90(float *p_humidity ,float *p_temperature)
// calculates temperature and humidity [%RH]
// input :humi (12 bit)
// temp (14 bit)
// output:humi [%RH]
// temp
{ 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 12 Bit
float t=*p_temperature; // t: Temperature 14 Bit
float rh_lin; // rh_lin:Humidity linear
float rh_true; // rh_true: Temperature compensated humidity
float t_C; // t_C :Temperature
t_C=t*0.01 - 40; //calc. temperature from ticks to
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
*p_humidity=rh_true; //return humidity[%RH]
}
//*********************第二部分DHT90设置 END****************************************
//*********主函数*****************
void main(void)
{
value humi_val,temp_val;
unsigned char error,checksum;
LcdRw=0;
s_connectionreset();
welcome();//显示欢迎画面
delay(2000);
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_dht90(&humi_val.f,&temp_val.f); //计算湿度与温度
GotoXY(0,0);//
Print("Tep:");
GotoXY(0,1);
Print("Hum:");
zhuanhuan(temp_val.f);//转换温度为uchar方便液晶显示
GotoXY(5,0);
str=0xDF;//℃的符号
str=0x43;
str='\0';
Print(str);
zhuanhuan(humi_val.f);//转换湿度为uchar方便液晶显示
GotoXY(5,1);
str='%';//%的符号
str='\0';//字符串结束标志
Print(str);
}
//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------
delay_n10us(80000); //延时约0.8s
}
}
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