最近在做MSP430F149驱动DHT11采集温湿度然后在LCD1602上显示的实验,但硬件连接好后总是显示00.0,好像DHT11没工作,看了好久找不出程序问题,希望有经验的你帮下忙,谢谢。。。原程序如下:
#include "msp430x14x.h" // 包含头文件
#define uchar unsigned char
#define uint unsigned int
#define DHT11_OUTPUT P2DIR|=BIT0
#define DHT11_INPUT P2DIR&=~BIT0
#define DHT11_H P2OUT|=BIT0
#define DHT11_L P2OUT&=~BIT0
#define DHT11_IN (P2IN&BIT0)
uchar str1[]={" "};
uchar str2[]={" "};
uchar dis1[] = {"TRH RH: "}; //定义数组
uchar dis2[] = {"TRH T: "};
uchar TH_data,TL_data,RH_data,RL_data,CK_data;
uchar TH_temp,TL_temp,RH_temp,RL_temp,CK_temp;
uchar com_data,untemp,temp;
uchar respond;
void Delayus(int n)
{
CCR0 = n;
TACTL |= (MC_1 + TACLR + TAIE); //增计数到CCR0,计数器清零,定时器A中断打开
TACTL |= TACLR;
TACTL |= MC_1;
while(!(TACTL & BIT0)); //等待
TACTL &= ~(MC_1 + TAIE + BIT0); //停止计数,关中断,清除中断标志
TACTL &= ~MC_1; //停止计数
TACTL &= ~BIT0; //清除中断标志
}
void delay(uint z)
{
uint t,y;
for(t=z;t>0;t--)
{
for(y=110;y>0;y--);
}
}
void write_com(uchar com)
{
P3OUT&=~BIT0;//RS
P3OUT&=~BIT1; //RW
P5OUT=com;
delay(5);
P3OUT|=BIT2; //E
delay(5);
P3OUT&=~BIT2;
}
void write_data(uchar date)
{
P3OUT|=BIT0;
P3OUT&=~BIT1;
P5OUT=date;
delay(5);
P3OUT|=BIT2;
delay(5);
P3OUT&=~BIT2;
}
void LCD_set_xy( uchar x, uchar y )
{
uchar address;
if (y == 0)
address = 0x80 + x;
else
address = 0xc0 + x;
write_com(address);
}
void LCD_write_char( uchar x,uchar y,uchar dat)
{
LCD_set_xy( x, y );
write_data(dat);
}
void init()
{
P3DIR=0xff;
P3SEL=0;
P3OUT=0x00;
P3OUT&=~BIT2;
P3OUT&=~BIT0;
P5DIR=0XFF;
P5SEL=0;
P5OUT=0X00;
write_com(0x38);
write_com(0x0c);
write_com(0x06);
write_com(0x01);
}
//设定LCD显示位置
void lcd_dis_pos(uchar pos)
{
write_com(pos | 0x80); //数据指针=80+地址变量
}
//收发信号检测,数据读取
char receive()
{
uchar i;
com_data=0;
for(i=0;i<=7;i++)
{
respond=2;
while((!DHT11_IN)&&respond++);
Delayus(40);
Delayus(40);
if(DHT11_IN)
{
temp=1;
respond=2;
while((DHT11_IN)&&respond++);
}
else
temp=0;
com_data<<=1;
com_data|=temp;
}
return(com_data);
}
//湿度读取子程序
//温度高8位== TL_data
//温度低8位== TH_data
//湿度高8位== RH_data
//湿度低8位== RH_data
//校验 8位 == CK_data
void read_TRH()
{
DHT11_OUTPUT; //设置P2.0输出
DHT11_H; ////输出高
Delayus(10);
DHT11_L;
Delayus(20000);
DHT11_H;
//DATA总线由上拉电阻拉高 主机延时20us
Delayus(40);
DHT11_INPUT;
Delayus(60);
Delayus(60);
if(!(DHT11_IN))
{
respond=2;
//判断DHT11发出 80us 的低电平响应信号是否结束
while((!DHT11_IN)&&respond++);
respond=2;
//判断从机是否发出 80us 的高电平,如发出则进入数据接收状态
while((DHT11_IN)&&respond++);
//数据接收状态
RH_temp = receive();
RL_temp = receive();
TH_temp = receive();
TL_temp = receive();
CK_temp = receive();
DHT11_OUTPUT; //设置P2.0输出
DHT11_H; //P2.0输出高,释放总线
untemp=(RH_temp+RL_temp+TH_temp+TL_temp);
if(untemp==CK_temp)
{
RH_data = RH_temp;
RL_data = RL_temp;
TH_data = TH_temp;
TL_data = TL_temp;
CK_data = CK_temp;
}
}
// RH_data = 21;
// RL_data = 13;
// TH_data =36;
// TL_data = 40;
//湿度整数部分
str1[0] =(char)0X30+RH_data/10;
str1[1] =(char) 0X30+RH_data%10;
str1[2] =0x2e; //小数点
//湿度小数部分
str1[3] =(char) 0X30+RL_data/10;
str1[5] = 0X25; //"%"
str1[6] = 0X52; //"R"
str1[7] = 0X48; //"H"
//温度整数部分
str2[0] =(char) 0X30+TH_data/10;
str2[1] =(char) 0X30+TH_data%10;
str2[2] =(char) 0x2e; //小数点
//温度小数部分
str2[3] = 0X30+TL_data/10;
str2[5] = 0X27; //"'"
str2[6] = 0X43; //"C"
}
void main (void)
{
uchar i,n=0x40,m;
WDTCTL = WDTPW + WDTHOLD;
TACTL|= TASSEL_2 + ID_3;
init();
while(1)
{
read_TRH();
//写字符
for(i=0;i<=7;i++)
{
lcd_dis_pos(i); //显示字符
write_data(dis1
);
lcd_dis_pos(n+i); //显示字符
write_data(dis2);
}
//写湿度数据
m=0x08;
for(i=0;i<=7;i++)
{
lcd_dis_pos(m);
write_data(str1);
m++;
}
//写温度数据
m=0x48;
for(i=0;i<=7;i++)
{
lcd_dis_pos(m);
write_data(str2);
m++;
}
}
}
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