[求助] 跪求大神给个G2553连接DHT11的完整程序

asd25845601 2013-5-22 23:52 楼主

我想用串口调试助手检测DHT11测到的数据，无奈水平太菜，所以跪求大神们帮助。

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沙发 destinydd

#include "msp430G2553.h"
#include"stdio.h"
#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)
#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long
#define CPU       (1000000)
#define delay_us(x) (__delay_cycles((double)x*CPU/1000000.0))
#define delay_ms(x) (__delay_cycles((double)x*CPU/1000.0))

uchar start_DHT11(void);
uchar DHT11_ReadChar(void);
void dht11(void);
uchar DHT11T_Data_H, DHT11T_Data_L, DHT11RH_Data_H, DHT11RH_Data_L,CheckData_temp;
void put(uchar *x)
{
  while(*x)
  {
while (!(IFG2&UCA0TXIFG));             // USCI_A0 TX buffer ready?
UCA0TXBUF=*x;
x++;
  }
}
void putc(char *x)
{
  while(*x)
  {
while (!(IFG2&UCA0TXIFG));             // USCI_A0 TX buffer ready?
UCA0TXBUF=*x;
x++;
  }
}
void wellcome()
{
put("*************************************\n");
put("******** hello,eeworld! ********\n");
put("******** this is mengzhilv! ********\n");
put("********  Copyright @ 2011 ********\n");
put("*************************************\n\n");
delay_ms(10);
}
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  UCA0CTL1 |= UCSWRST;
BCSCTL1 = CALBC1_1MHZ;
DCOCTL = CALDCO_1MHZ;

P1SEL = BIT1 + BIT2 ;
P1SEL2 = BIT1 + BIT2 ;
UCA0CTL1 |= UCSSEL_2;
UCA0BR0 = 104;
UCA0BR1 = 0;
UCA0MCTL = UCBRS0;
UCA0CTL1 &= ~UCSWRST;                // **Initialize USCI state machine**
  delay_us(1000);
  wellcome();
  put("**********DHT11 TEST**********\n");
  delay_ms(1000);

while(1)
  {
  dht11();
  }
}
uchar start_DHT11(void)
{
uchar TData_H_temp,TData_L_temp,RHData_H_temp,RHData_L_temp,checktemp;
uchar  presence,flag;
uint count;
DHT11_OUTPUT;
DHT11_L; //拉低18ms以上
delay_ms(20);
DHT11_H;
DHT11_INPUT;
delay_us(40);
presence=DHT11_IN;
if(!presence)
{
count=2;
while((!DHT11_IN)&&count++);//等待低电平
count=2;
while((DHT11_IN)&&count++);//等待高电平
   RHData_H_temp = DHT11_ReadChar();
   RHData_L_temp = DHT11_ReadChar();
   TData_H_temp = DHT11_ReadChar();
   TData_L_temp = DHT11_ReadChar();
   CheckData_temp = DHT11_ReadChar();
   DHT11_OUTPUT;
   DHT11_H;
   checktemp = (RHData_H_temp + RHData_L_temp + TData_H_temp + TData_L_temp);
   if (checktemp == CheckData_temp) {
      DHT11RH_Data_H = RHData_H_temp;
      DHT11RH_Data_L = RHData_L_temp;
      DHT11T_Data_H = TData_H_temp;
      DHT11T_Data_L = TData_L_temp;
      flag=1;
   }
}
P1OUT |=BIT0;
return flag;
}
uchar DHT11_ReadChar(void)
{
  unsigned char dat;
unsigned int count;    //计数防止死等
unsigned char i;
for(i=0;i<8;i++)
{
   count=2;
   while((!DHT11_IN)&&count++);    //等待50us低电平结束
   delay_us(40); //40us
   dat <<= 1;       //50us低电平+28us高电平表示'0'
   if(DHT11_IN) //50us低电平+70us高电平表示'1'
      dat |= 1;
   count=2;
   while((DHT11_IN)&&count++);
   if(count==1)    //超时则跳出for循环
      break;
}
return dat;
}
void dht11()
{
char c[40];
uchar o;
o=start_DHT11();
P1OUT |=BIT1;
delay_ms(300);
P1OUT &=~BIT1;
delay_ms(300);
if (o)
   {
      put("DHT11 EXIST AND ACQUIRE SUCCESSFUL!\n");
      delay_ms(10);
  sprintf(c, "%d.%d %d.%d %d\r\n",DHT11RH_Data_H,DHT11RH_Data_L,DHT11T_Data_H,DHT11T_Data_L,CheckData_temp);
  putc(c);
   }
}

点赞 2013-5-26 19:28