【求大神出没】PSOC设定GPIO的问题/(ㄒoㄒ)/~~

只看该作者 · 2016-8-25 21:17

求大神出没/(ㄒoㄒ)/~~
开发软件：PSOC 5LP
单片机：CY8CKIT-050
外加模块：DHT22
用PSOC写温湿度测量的时候，DHT22可以正常接收主机发送的开始信号，并且发送数据（已经在示波器上捕捉到了正确的数据），但是主机没有办法接收到DHT22的数据，读取数据的引脚始终为高电平，是设定GPIO的时候出现了问题吗？还是其他说明原因，有什么办法解决吗？/(ㄒoㄒ)/~~
附代码：（接收pin名称叫Data，设定为同时勾选input和output）
#include<project.h>
#include<stdio.h>

int main()
{
LCD_Start();
LCD_Position(0,0);
LCD_PrintString("Ready") ;
uint8 t;
uint8 num[5] = {0};
uint8 sum = 0;
uint16 temp = 100;
uint16 wet = 200;
CyDelay(2000);

LCD_Position(0,0);
LCD_PrintString("    ");
LCD_Position(0,0);
LCD_PrintString("Temp");
LCD_Position(0,7);
LCD_PrintString("Wet");

//Data_SetDriveMode(PIN_DM_STRONG);
Data_Write(1);
CyDelayUs(1000);
Data_Write(0);
CyDelayUs(300);
//这里为止都是正常的，示波器可以捕捉到DHT22传输的数据
Data_SetDriveMode(PIN_DM_DIG_HIZ);
CyDelayUs(20);
t = Data_ReadDataReg();//从这里开始不能正常读数了，始终读到低电平，如果用Data_Read()则始终读到高电平
//while (t) t = Data_Read();
if (t == 0)
{
      while (!t) t = Data_ReadDataReg();
      while (t)  t = Data_ReadDataReg();
      int i,j,temp;
      for (i = 0; i<5; i++)
      {
         for (j = 0; j<8; j++)
         {
            while (!t) t = Data_ReadDataReg();
            CyDelayUs(30);
            t = Data_ReadDataReg();
            temp = t;
            num[i]<<=1;
            num[i] = num[i] | temp;
         }
         if (i<4) sum+=num[i];
      }
      Data_SetDriveMode(PIN_DM_STRONG);
      Data_Write(0);
      CyDelayUs(50);
      Data_Write(1);
      if (sum == num[4])
      {
      wet=num[0];
      wet<<=4;
      wet+=num[1];
      temp=num[2];
      temp<<=4;
      temp+=num[3];
      LCD_Position(1,0);
      LCD_PrintString("    ");
      LCD_Position(1,0);
      LCD_PrintNumber(temp);
      LCD_PutChar('C');
      LCD_Position(1,7);
      LCD_PrintString("    ");
      LCD_Position(1,7);
      LCD_PrintNumber(wet);
      LCD_PutChar('%');
      }
      else
      {
      LCD_Position(1,0);
      LCD_PrintString("    ");
      LCD_Position(1,0);
      LCD_PrintString("ERROR");
      }
}
else
{
      LCD_Position(1,0);
      LCD_PrintString("    ");
      LCD_Position(1,0);
      LCD_PrintString("Fail");
}
}