/***************************************************************
功能:實現ADC采樣芯片外的模擬電壓，通過LCD顯示，并通過串口發送到PC機
     注：插上短路環J4、J10、J12、J21,拔掉短路環J8。在J18-4腳輸入一小于5V的電壓。
版本:V1.0
***************************************************************/
#include <c8051f330.h>                 // SFR declarations
#include <stdio.h>
#include <INTRINS.H>
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F02x
//-----------------------------------------------------------------------------
sfr16 DP       = 0x82;                 // data pointer
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 ADC0     = 0xbd;                 // ADC0 data
sfr16 ADC0GT   = 0xc4;                 // ADC0 greater than window
sfr16 ADC0LT   = 0xc6;                 // ADC0 less than window
sfr16 RCAP2    = 0xca;                 // Timer2 capture/reload
sfr16 T2       = 0xcc;                 // Timer2
sfr16 RCAP4    = 0xe4;                 // Timer4 capture/reload
sfr16 T4       = 0xf4;                 // Timer4
sfr16 DAC0     = 0xd2;                 // DAC0 data
sfr16 DAC1     = 0xd5;                 // DAC1 data

#define BAUDRATE     9600              // Baud rate of UART in bps
#define SYSCLK       24500000          // SYSCLK frequency in Hz    22118400 
#define SAMPLE_RATE  50000             // Sample frequency in Hz
#define INT_DEC      256               // integrate and decimate ratio

void PORTb_Init (void);
void UART0_Init (void);
void ADC0_Init (void);
void Timer3_Init (int counts);
void ADC0_ISR (void);
void Write_CHAR(unsigned char yjchar);
void Write_COM(unsigned char yjcom );
void YJ_Init(void);
unsigned long  temp;
int k;

unsigned long result;
unsigned char NCDdata[10]={0x30};
unsigned char xdata tab2[10]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};
void main (void) {
  unsigned int i;            // integer and fractional portions of
  unsigned int m1,m2,m3,m4;
  unsigned char aa,bb,cc,dd;                                     // Disable Watchdog timer
   PCA0MD &= ~0x40;                    // WDTE = 0 (clear watchdog timer 
                                       // enable)
   OSCICN |= 0x03;                     // Set internal oscillator to highest
                                    // setting (24500000)
   PORTb_Init ();                       // 初始化交叉開關和 GPIO
   UART0_Init ();                      // 初始化UART0
   Timer3_Init (SYSCLK/SAMPLE_RATE);   // initialize Timer3 to overflow at
                                       // sample rate
   ADC0_Init ();                       //  ADC 初始化

   AD0EN = 1;                          // 使能 ADC
   
   EA = 1;  
   while(result==0);				   //等于0,則等待                     
   while (1) {
      EA = 0;                          // 關中斷
      temp = result;
	  temp &=0x000fff;

      EA = 1;                          //開中斷
	temp = temp*3300;
	temp=temp/1024;
	temp =(1850000-1000l*temp)/205;
	printf ("V_input is %ldmV\n", temp); 
     for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
	m1=temp/1000;
	m2=(temp-1000*m1)/100;
	m3=(temp-1000*m1-100*m2)/10;
	m4=temp-1000*m1-100*m2-10*m3;
	for(k=0;k<4000;k++);
	for(k=0;k<4000;k++);
    for(k=0;k<4000;k++);
	i=0;
	do
	{
 	 if(i==m1) aa=tab2[i];
      
 	 if(i==m2) bb=tab2[i];
     
 	 if(i==m3) cc=tab2[i];
      
 	 if(i==m4) dd=tab2[i];
 	  i++;
       
	 }while(i<10);

     YJ_Init();
	 for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
	 Write_CHAR(aa);
	 Write_CHAR(0x2e);
 	 Write_CHAR(bb);
	 Write_CHAR(cc);
	 Write_CHAR(dd);

 	 Write_CHAR(0x56);
	 for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
     for(k=0;k<4000;k++);
	}

      
}
//-----------------------------------------------------------------------------
// PORT配置
//-----------------------------------------------------------------------------
void PORTb_Init (void)
{
   XBR0 |= 0x01;                     // 使能 UART P0.4(TX) and P0.5(RX)                     
   XBR1 |= 0x40;                     // 使能交叉開關和弱上拉
   P1MDIN|=0X02;                        //P1.1配置為模擬輸入
   P1SKIP |= 0x02;
   P0MDOUT|= 0x10;                    // enable TX0 as a push-pull output  
}
//-----------------------------------------------------------------------------
// UART0配置
//-----------------------------------------------------------------------------
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1.
void UART0_Init (void)
{
   SCON0   = 0x10;                     // SCON0: mode 0, 8-bit UART, enable RX
   TMOD    = 0x20;                     // TMOD: timer 1, mode 2, 8-bit reload
   TH1     = 0x96;                     //-(SYSCLK/BAUDRATE/16);    
                                       // set Timer1 reload value for baudrate   
   TR1     = 1;                         // start Timer1
                                       // Timer1 uses SYSCLK as time base
   PCON   |= 0x80;                      // SMOD00 = 1
   TI0     = 1;                         // Indicate TX0 ready
}
//-----------------------------------------------------------------------------
// ADC0配置，T3定時啟動ADC
//-----------------------------------------------------------------------------
void ADC0_Init (void)
{
   ADC0CN = 0xc5;                       // ADC0 T3定時采樣
   REF0CN = 0x0e;                      // 啟用內部基準源
   AMX0P=0X09;                        // 選擇采樣輸入源P1.1作為正輸入
   AMX0N=0X11;                       //選擇采樣輸入源GND作為負輸入ADC工作在單端方式
   ADC0CF = 0x38;			
   EIE1 |= 0x08;                       // 啟用 ADC 中斷
}
//-----------------------------------------------------------------------------
// Timer3配置，T3定時啟動ADC
//-----------------------------------------------------------------------------
void Timer3_Init (int counts)
{
   CKCON=0X80;
   TMR3RL  = -counts;
   TMR3    = 0xffff;
   EIE1   &= ~0x80;//禁止定時器3中斷
   TMR3CN |= 0x04;//定時器3允許
}

//-----------------------------------------------------------------------------
// ADC0采樣中斷
//-----------------------------------------------------------------------------
void ADC0_ISR (void) interrupt 10
{
   static unsigned int_dec=INT_DEC;    
   static unsigned long accumulator=0L;                     
  
    ADC0CN &= ~0x20;				         // 清 ADC 中斷標志位
    accumulator=accumulator +ADC0;       // 累加ADC采樣數據
    int_dec--;                           // 指針減1

    if (int_dec == 0)
	 {                                   // 累加完了嗎？
     int_dec = INT_DEC;                 // 指針復位
     result = accumulator>>8;
     accumulator = 0L;                  // 累加和變量清0
     }
}