main.c

AVR,系列单片机MEGA48应用例程,包括原理图,代码基本包括全部资源的配置应用.

//ICC-AVR application builder : 2005-5-17 下午 01:33:05
// Target : M48
// Crystal: 7.3728Mhz

#define IAR_DEMO
#ifdef  IAR_DEMO
#include <iom48.h>
#include <ioavr.h>
#include <inavr.h>
#else 
#include <iom48v.h>
#include <macros.h>
#endif
const char DataTab[16]=
	{0xc0,0xf9,0xa4,0xb0,0x99,0x92,
	  0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8E};

unsigned int TimeCount;
unsigned char Display_Position;
void Display_Data_LED(unsigned int Display_Data)

{
unsigned char  displaydata,displaydata_2;
unsigned char  Data1,Data2,Data3,Data4;
Data4=Display_Data/1000;
Data3=(Display_Data%1000)/100;
Data2=((Display_Data%1000)%100)/10;
Data1=Display_Data%10;
switch(Display_Position)
{

case 1:      displaydata=DataTab[Data1];
             displaydata_2=DataTab[Data1]&0xc0;
  			 PORTD=0x3B|displaydata_2;
 			 PORTB=displaydata;
  			 break;
case 2:		 displaydata=DataTab[Data2];
    		 displaydata_2=DataTab[Data2]&0xc0;
			 PORTD=0x37|displaydata_2;
             PORTB=displaydata;
  			 break;
case 3:  	 displaydata=DataTab[Data3];
  		     displaydata_2=DataTab[Data3]&0xc0;
  			 PORTD=0x2F|displaydata_2;
 			 PORTB=displaydata;
  			 break;
case 4:		 displaydata=DataTab[Data4];
  			 displaydata_2=DataTab[Data4]&0xc0;
  			 PORTD=0x1F|displaydata_2;
 	         PORTB=displaydata;
  			 break;
 default:
  			 break;
  			             
 }

}

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0xFF;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0XFF;
}


void timer0_init(void)
{
 TCCR0B = 0x00; //stop
 TCNT0 = 0xD9; //set count
 TCCR0A = 0x00; 
 TCCR0B = 0x05; //start timer
}
#ifdef  IAR_DEMO
#pragma vector=TIMER0_OVF_vect	
__interrupt 
#else
#pragma interrupt_handler timer0_ovf_isr:17
#endif

void timer0_ovf_isr(void)
{
  	TCNT0 = 0xD9; //set count
    Display_Position++;
    if(Display_Position>=5)
 	Display_Position=1;
	Display_Data_LED(TimeCount);

 
}

//TIMER1 initialize - prescale:256
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 1Sec
// actual value:  1.000Sec (0.0%)
void timer1_init(void)
{
 TCCR1B = 0x00; //stop
 TCNT1H = 0x8F; //setup
 TCNT1L = 0x81;
 OCR1AH = 0x70;
 OCR1AL = 0x7F;
 OCR1BH = 0x70;
 OCR1BL = 0x7F;
 ICR1H  = 0x70;
 ICR1L  = 0x7F;
 TCCR1A = 0x00;
 TCCR1B = 0x04; //start Timer
}

#ifdef  IAR_DEMO
#pragma vector=TIMER1_OVF_vect	
__interrupt 
#else
#pragma interrupt_handler timer1_ovf_isr:14
#endif

void timer1_ovf_isr(void)
{
 //TIMER1 has overflowed
 TCNT1H = 0x8F; //reload counter high value
 TCNT1L = 0x81; //reload counter low value
 TimeCount++;
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
  #ifdef  IAR_DEMO
__disable_interrupt();
#else 
CLI(); //disable all interrupts
#endif
 port_init();
 timer0_init();
 timer1_init();

 MCUCR = 0x00;
 EICRA = 0x00; //extended ext ints
 EIMSK = 0x00;
 
 TIMSK0 = 0x01; //timer 0 interrupt sources
 TIMSK1 = 0x01; //timer 1 interrupt sources
 TIMSK2 = 0x00; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0 
 PCMSK1 = 0x00; //pin change mask 1 
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable 
 PRR = 0x00; //power controller
   #ifdef  IAR_DEMO
__enable_interrupt();
#else 
 SEI(); //re-enable interrupts
#endif
 //all peripherals are now initialized
}

//
void main(void)
{
 TimeCount=0;
 Display_Position=0;
 init_devices();
 while(1);
 //insert your functional code here...
}