main.c

关于温度传感器和电机测速的单片机程序

#include <absacc.h>
#include <reg52.h> 
// #define FIRST_TIM

unsigned char code CharTab[] = {0x03,0x9F,0x25,0x0D,0x99,0x49,0x41,0x1F,0x01,0x09,0x11,0xC1,0x63,0x85,0x61,0x71};
unsigned char code LedSel[] =  {0x10,0x30,0x50,0x70,0x90,0xB0};

extern void ReadTim(void);
extern void WriteTim(void);

bit xchg,update;
unsigned char DispBuf[6];
unsigned char data RTC_ARR[8] _at_ 0x20;
unsigned char data Minute,Second,Hour;

/*---------- Delay Time -----------*/
void delay(unsigned int t)
{ 
	unsigned int i;
    for(i=0;i<t;i++)
         ;
}

/*-------- calculate SEG value --------*/
void calculate()
{
	DispBuf[0] = Second & 0x0F;
	DispBuf[1] = (Second & 0xF0)>>4;
	DispBuf[2] = Minute & 0x0F;
	DispBuf[3] = (Minute & 0xF0)>>4;
	DispBuf[4] = Hour & 0x0F;
	DispBuf[5] = (Hour & 0xF0)>>4;
}

/*-------- Extern Interrupt ----------*/ 
void ex1(void) interrupt 2 using 1
{
	xchg = 1;
	Second++;
    P1= ~P1;
	if((Second & 0x0F)>=10)
	{
		Second += 6;
		if(Second>=0x60) update = 1;
	}

}

void main()
{  
	unsigned char i;	
	P1 = 0x55;	
	for(i=0;i<6;i++) 	DispBuf[i] = 0;

  	/*----------- Setup time and enable oscillator -----------*/
	ReadTim();        
	RTC_ARR[0] = RTC_ARR[0] & 0x7F; // enable oscillator(bit 7=0)	
	#ifdef FIRST_TIM
	RTC_ARR[0] = 0x00; 	// Second
	RTC_ARR[1] = 0x10; 	// Minute
	RTC_ARR[2] = 0x19; 	// Hour, 24-hour mode
	RTC_ARR[3] = 0x06; 	// Day
	RTC_ARR[4] = 0x12; 	// Date
	RTC_ARR[5] = 0x11; 	// Month
	RTC_ARR[6] = 0x05; 	// Year
	#endif
    RTC_ARR[7] = 0x90;  // Control: OUT=1; SQWE=1,Square Wave Enable; RS1 RS0=00,1Hz Square Wave

	Second = RTC_ARR[0];
	Minute = RTC_ARR[1];
    Hour = RTC_ARR[2];

	WriteTim();			// Set RTC

	INT1 = 1;
    IT1 = 1;
    EX1 = 1;
	EA = 1;
	xchg = 1;
	update = 0;

	while(1)
	{
		if(update)
		{
			ReadTim();        
			Second = RTC_ARR[0];
			Minute = RTC_ARR[1];
			Hour = RTC_ARR[2];
			calculate();
			update = 0;		
		}
		if(xchg)
		{
			xchg = 0;
			RTC_ARR[0] = Second;
			calculate();		
		}	
        for(i=0;i<6;i++)
		{
			P2 = 0x0F;
			P0 = CharTab[DispBuf[i]];
			P2 = LedSel[i] | 0x0F;
            delay(100);
		}
	}
}