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 ADC_Value;
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;
  			             
 }

}
//ADC initialize
// Conversion time: 56uS
void adc_init(void)
{
 ADCSRA = 0x00; //disable adc
 ADMUX = 0x00;  //select adc input 0
 ACSR  = 0x80;
 ADCSRB = 0x00;
 ADCSRA = 0xEE;
 
}
#ifdef  IAR_DEMO
#pragma vector=ADC_vect	
__interrupt 
#else 
#pragma interrupt_handler adc_isr:22
#endif
void adc_isr(void)
{
 //conversion complete, read value (int) using...
 ADC_Value=ADCL;            //Read 8 low bits first (important)
 ADC_Value|=(int)ADCH << 8; //read 2 high bits and shift into top byte
}

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(ADC_Value);

 
}


//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();
 adc_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)
{
 ADC_Value=0;
 Display_Position=0;
 init_devices();
 while(1);
 //insert your functional code here...
}