CC2530: Temperature&Humidity Sensor DHT22 with CC2530

/******************** (C) COPYRIGHT 2012 waveshare ********************
* File Name          : main.c
* Author             : waveshare.xuwenjie
* Version            : V1.0.0
* Date               : 29/10/2012
* Description        : 
************************************************************************/

#include <ioCC2530.h>
#include <string.h>
#include "LCD22.h"
#include "Touchpanel.h"

#define uint unsigned int
#define uchar unsigned char
#define uint16 unsigned short

#define DATA_PIN P1_2 

unsigned Temp, RH, Sum ;

uchar Check , T_byte1 , T_byte2 , RH_byte1 , RH_byte2 ;



void delay_us (uint16 timeout) 
{
    while (timeout--)
    {
        asm("NOP");
        asm("NOP");
        asm("NOP");
    }
}

void StartSignal()
{
  P1DIR |=  (1<<2);              // Configure connection pin as output
  DATA_PIN = 0;                        // Connection pin output low
  Delay_ms(30);
  DATA_PIN = 1;                        // Connection pin output high
  delay_us(30);
  P1DIR &=  ~(1<<2);              // Configure connection pin as input
 }

void CheckResponse()
 {
  Check = 0;
  delay_us(40);
  if (DATA_PIN == 0)
   {
      delay_us(80);
      if (DATA_PIN == 1)   
         Check = 1;   
         delay_us(40);
   }
 }


char ReadData()
{
 char i, j;
 for(j = 0; j < 8; j++)
  {
     while(!DATA_PIN); //Wait until PORTD.F0 goes HIGH
     delay_us(30);
     if(DATA_PIN == 0)
       i&= ~(1<<(7 - j));  //Clear bit (7-b)
     else 
      {
         i|= (1 << (7 - j));  //Set bit (7-b)
         while(DATA_PIN);     //Wait until PORTD.F0 goes LOW
      }  
  }
 return i;
}




/*******************************************************************************
* Function Name  : SystemInit
* Description    : Initialize the system
* Input          : None
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/

void SystemInit(void)
{
	CLKCONCMD &= ~0x40;               //*Sets the system clock source for 32 MHZ crystal oscillator
	while(CLKCONSTA & 0x40);          //* Wait for Oscillator to be ready    
	CLKCONCMD &= ~0x47;               //*Sets the system master clock frequency for 32 MHZ
}


void Init_UART(void)
{
  PERCFG = 0x00; //Peripheral-control register
  P0SEL = 0x0c; //P0_2=RX,P0_3=TX for peripheral control
  P2DIR &= ~0XC0; //set periorty to USRT0
  U0CSR |= 0x80; //control and status reg

  //Bit7 select mode :0 spi mode , 1 UART mode
  
  U0GCR |= 7; //U0GCR[4:0] & U0BAUD defines baud-rate
  U0BAUD |= 59; //baud-rate is 115200
  UTX0IF = 0; //(0: Interrupt not pending , 1: Interrupt pending)
  URX0IF = 0;
}


void dsply_num( unsigned int Xpos , unsigned int Ypos , unsigned int Color , uint16 a )
{
  uint16 b=0;
  uint16 c=0;
  uint16 d=0;
  uint16 e=0;
  uint16 f=0;
  uint16 g=0;

  d=a/1000;
  e=a%1000;
  c=e/100;
  b=e%100;
  f=b/10;
  g=b%10;

  PutChar( Xpos , Ypos , d+48 , Color , 15 );
  PutChar( Xpos + 10 , Ypos , c+48 , Color , 15 );
  PutChar( Xpos + 20 , Ypos , f+48 , Color , 15 );
  PutChar( Xpos + 30 , Ypos , g+48 , Color , 15 );

  U0DBUF=d+48;
  while(!UTX0IF);
  UTX0IF = 0;
  U0DBUF=c+48;
  while(!UTX0IF);
  UTX0IF = 0;
  U0DBUF=f+48;
  while(!UTX0IF);
  UTX0IF = 0;
  U0DBUF=g+48;
  while(!UTX0IF);
  UTX0IF = 0 ;
  U0DBUF= '/' +48;
}




/*******************************************************************************
* Function Name  : main
* Description    : Main program
* Input          : None
* Output         : None
* Return         : None
* Attention		 : None
*******************************************************************************/
//extern U8 WenDu,ShiDu;//�����¶ȴ�ű���

void main(void)
{	
  
 
   SystemInit(); 
   Init_UART();
   
   LCD_Initializtion();
   Disp_Touchpanel(); 
   
   StartSignal();
   CheckResponse();
   
   while(1)
   {
     
     if(Check == 1)
      {
         RH_byte1 = ReadData();
         RH_byte2 = ReadData();
         T_byte1 = ReadData();
         T_byte2 = ReadData();
         Sum = ReadData();
  
         if(Sum == ((RH_byte1+RH_byte2+T_byte1+T_byte2) & 0XFF))
           {
              Temp = T_byte1;
              Temp = (Temp << 8) | T_byte2;
              
              RH = RH_byte1;
              RH = (RH << 8) | RH_byte2;
              
              GUI_Text( 50 , 50 ,  "Temp:   . C" , White , 15 );
              GUI_Text( 46 , 100 , "Humidity:   . %" , Red , 15 );
             
              if (Temp > 0X8000)
               {
                  GUI_Text( 55 , 50 ,  "-" , White , 15 );
                  Temp = Temp & 0X7FFF; 
               }
             PutChar( 56 , 50 , 48 + ((Temp / 100) % 10) , White , 15 ); 
             PutChar( 57 , 50 , 48 + ((Temp / 10) % 10) , White , 15 ); 
             PutChar( 59 , 50 , 48 + (Temp % 10) , White , 15 ); 
            
             PutChar( 56 , 100 , 48 + ((RH / 100) % 10) , White , 15 ); 
             PutChar( 57 , 100 , 48 + ((RH / 10) % 10) , White , 15 ); 
             PutChar( 59 , 100 , 48 + (RH % 10) , White , 15 ); 
             
            
           }
          else
           {
              
              GUI_Text( 46 , 50 , "***** Check sum error*****" , Red , 15 );
              GUI_Text( 46 , 100, "****** Check sum error****" , Red , 15 );
              
           }
       }
      else 
       {
           GUI_Text( 46 , 50 , "***********No response" , Red , 15 );
           GUI_Text( 46 , 100, "from the sensor*******" , Red , 15 );
           
       }
         Delay_ms(1000);
    }
    
   
   
}