超声波测距-AVR程序代码

ID:51024 · 发表于 2014-7-12 01:56

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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