| 以前学习AVR时候写的程序，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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