以前學習AVR時候寫的程序，分享一下
#include
#include
#define uchar unsigned char
#define uint unsigned int
uchar int_flag;
uint qian,bai,shi,ge;
uint i;
float distance;
// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x18 ;PORTB
#endasm
#include
// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{#asm("sei")
if(int_flag)
{
distance=i*17.3;
}
else if(int_flag==0)
{
i=0;
int_flag=1;
TCCR0=0x0A;
}
}
// Timer 0 output compare interrupt service routine
interrupt [TIM0_COMP] void timer0_comp_isr(void)
{
i++;
}
// Declare your global variables here
void main(void)
{
// Declare your local variables here
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTA=0x00;
DDRA=0x01;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x00;
// Port C initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTD=0x04;
DDRD=0x00;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: 2000.000 kHz
// Mode: CTC top=OCR0
// OC0 output: Disconnected
TCCR0=0x00;
TCNT0=0x00;
OCR0=0xc8;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer 1 Stopped
// Mode: Normal top=FFFFh
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer 1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer 2 Stopped
// Mode: Normal top=FFh
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Any change
// INT1: Off
// INT2: Off
GICR|=0x40;
MCUCR=0x01;
MCUCSR=0x00;
GIFR=0x40;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x02;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// LCD module initialization
lcd_init(16);
// Global enable interrupts
#asm("sei")
PORTA.0=1;
delay_us(15);
PORTA.0=0;
while (1)
{
qian=(int)distance/1000;
bai=(int)distance00/100;
shi=(int)distance0/10;
ge=(int)distance;
lcd_gotoxy(0,0);
lcd_putchar(qian+48);
lcd_putchar(bai+48);
lcd_putchar(shi+48);
lcd_putchar(ge+48);
delay_ms(200);
PORTA.0=1;
delay_us(15);
PORTA.0=0;
int_flag=0;
};
}
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