/***************************************************************
功能:實現ADC0采樣芯片溫度，通過LCD顯示，并通過串口0（J13）發送到PC機,同時接收PC傳回的一個字符并顯示，
	 請使用串口調試工具調試！
     注：試驗時把ADC0的工作基準VREF0（J7_5和J7_6或J7_2和J7_6）和LCD電源跳線（J18_1和J18_2）聯接好！
作者:ZDP
時間:2005-11-30
版本:V1.0
用外部基準:
				 J7
	NC			1	2	內部VREF
	外部VREF	3	4	內部DAC工作基準輸入
	外部VREF	5---6	內部ADC0工作基準輸入
	外部VREF	7	8	內部ADC1工作基準輸入
或用內部基準:
				 J7
	NC			1	2-	內部VREF
	外部VREF	3	4 |	內部DAC工作基準輸入
	外部VREF	5	6-	內部ADC0工作基準輸入
	外部VREF	7	8	內部ADC1工作基準輸入
***************************************************************/
#include <c8051f020.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     = 0xbe;                 // 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     115200            // Baud rate of UART in bps
#define SYSCLK       22118400          // SYSCLK frequency in Hz
#define SAMPLE_RATE  50000             // Sample frequency in Hz
#define INT_DEC      256               // integrate and decimate ratio
#define	AMX0SL_AIN   8				   // 0=AIN0....7=AIN7,8=TEMP

void SYSCLK_Init (void);
void PORT_Init (void);
void UART0_Init (void);
void ADC0_Init (void);
void Timer3_Init (int counts);
void ADC0_ISR (void);
void LCD_Init(void);
							   //LCD顯示數組初值“000.00 ”
unsigned char xdata NCDdata[7]={0x30,0x30,0x30,0x2e,0x30,0x30,0x20};
long result;
unsigned char *lcdpoint;        //指向 lcddata數組的指針
unsigned char lcd_data_count;   //要顯示的數據個數 

void main (void) {
   long temperature,x;
   int temp_int, temp_frac;
   char data1;

   WDTCN = 0xde;                       // disable watchdog timer
   WDTCN = 0xad;

   SYSCLK_Init ();                     // initialize oscillator
   PORT_Init ();                       // initialize crossbar and GPIO
   UART0_Init ();                      // initialize UART0
   Timer3_Init (SYSCLK/SAMPLE_RATE);   // initialize Timer3 to overflow at
                                       // sample rate

   ADC0_Init ();                       // init ADC

	AD0EN = 1;                         // enable ADC

    EA = 1;  
	while(result==0);					//等于0,側等待ADC0的第一個數據                    
	while (1) {
      EA = 0;                          // 關中斷
      temperature = result;
      EA = 1;                          //開中斷
      //轉換為實際溫度數據
      temperature = temperature - 42380;
      temperature = (temperature * 100L) / 156;
      temp_int = temperature / 100;
      temp_frac = temperature - (temp_int * 100);
	  printf ("Temperature is %+02d.%02d\n", temp_int, temp_frac);//把溫度數據通過串口發送至PC機
	  if(RI0==1)			//只接收PC發過來的一個字符
	  {
		NCDdata[6]=SBUF0;	//字符數據保存至LCD顯示數組中
		RI0=0;
	   }
	  //在LCD上顯示溫度
	  //LCD顯示數據處理
	  NCDdata[0]=temp_int/100+0x30;NCDdata[1]=(temp_int%100)/10+0x30;NCDdata[2]=(temp_int%100)%10+0x30;
	  NCDdata[4]=temp_frac/10+0x30;NCDdata[5]=temp_frac%10+0x30;


	  LCD_Init();                         	//LCD初始化
	  P2  = 0xA0;                         	//準備送數據
	  lcdpoint=&NCDdata;					//取地址
	  for(lcd_data_count=7;lcd_data_count>0;lcd_data_count--)
	  { 
	  		data1=*lcdpoint;				//讀出數據				
		    P3 = data1; 					//寫數據到端口
			P2 = 0X20;
	        P2 = 0XA0;						//控制LCD	
	        lcdpoint++;
			for(x=0;x<0x5000;x++);
	  }
	  for(data1=0;data1<0x7;data1++)		//軟件延時
	  {
			for(x=0;x<0xffff;x++)
	  		{_nop_();}
       }
	}
}

//-----------------------------------------------------------------------------
// SYSCLK配置
//-----------------------------------------------------------------------------
// 配置系統時鐘使用外部晶振22.1184MHz

void SYSCLK_Init (void)
{
   int i;                              // delay counter

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal
   for (i=0; i < 256; i++) ;           // XTLVLD blanking interval (>1ms)

   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
}

//-----------------------------------------------------------------------------
// PORT配置
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
   XBR0    = 0x04;                     // Enable UART0
   XBR1    = 0x00;
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   P0MDOUT |= 0x01;                    // enable TX0 as a push-pull output
   P2MDOUT  = 0xe0;                    // P2口設為推挽方式
   P3MDOUT  = 0xff;                    // P2口設為推挽方式
}

//-----------------------------------------------------------------------------
// UART0配置
//-----------------------------------------------------------------------------
// Configure the UART0 using Timer1, for <baudrate> and 8-N-1.
void UART0_Init (void)
{
   SCON0   = 0x50;                     // SCON0: mode 1, 8-bit UART, enable RX
   TMOD    = 0x20;                     // TMOD: timer 1, mode 2, 8-bit reload
   TH1    = -(SYSCLK/BAUDRATE/16);     // set Timer1 reload value for baudrate
   TR1    = 1;                         // start Timer1
   CKCON |= 0x10;                      // 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 = 0x05;                      // ADC0 T3定時采樣,左對齊
   REF0CN = 0x07;                      // 啟用內部基準源
   AMX0SL = AMX0SL_AIN;                // 選擇采樣輸入源
   ADC0CF = (SYSCLK/2500000) << 3;     // ADC conversion clock = 2.5MHz
   ADC0CF |= 0x01;                     // PGA gain = 2

   EIE2 |= 0x02;                       // 啟用 ADC 中斷
}

//-----------------------------------------------------------------------------
// Timer3配置，T3定時啟動ADC
//-----------------------------------------------------------------------------
void Timer3_Init (int counts)
{
   TMR3CN = 0x02;
   TMR3RL  = -counts;
   TMR3    = 0xffff;
   EIE2   &= ~0x01;
   TMR3CN |= 0x04;
}

//-----------------------------------------------------------------------------
// ADC0采樣中斷
//-----------------------------------------------------------------------------
void ADC0_ISR (void) interrupt 15
{
   static unsigned int_dec=INT_DEC;    
   static long accumulator=0L;                     

   AD0INT = 0;						   // 清 ADC 中斷標志位


	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
   }
}
//LCD初始化
void LCD_Init(void)
{unsigned long x;
   P2 = 0X80;
   for(x=0;x<1000;x++);
   //P7 = 0x30;				/*一行顯示*/
   P3 = 0x38;				/*兩行顯示*/
   P2 = 0X00;//0x08;
   P2 = 0X80;//0x09; 
   for(x=0;x<1000;x++);
   P3 = 0x0e;
   P2 = 0x00;
   P2 = 0x80;
   for(x=0;x<1000;x++);
   P3=  0x06;
   P2 = 0x00;
   P2 = 0x80;
   for(x=0;x<5000;x++);
   P3 = 0x01;
   P2 = 0x00;
   P2 = 0x80; 
   for(x=0;x<5000;x++);
}