/***************************************************** This program was produced by the CodeWizardAVR V1.24.8d Professional Automatic Program Generator © Copyright 1998-2006 Pavel Haiduc, HP InfoTech s.r.l. http://www.hpinfotech.com Project : Version : Date : 11.04.2008 Author : F4CG Company : F4CG Comments: Chip type : ATmega8 Program type : Application Clock frequency : 16,000000 MHz Memory model : Small External SRAM size : 0 Data Stack size : 256 *****************************************************/ #include // Standard Input/Output functions #include int zaehler; //Zaehler für die Anzahl der Interrupts int winkel; //dauer des Ultraschallechos vom Senden bis zum Empfang char modulo_z; int winkel; // Timer 2 output compare interrupt service routine interrupt [TIM2_COMP] void timer2_comp_isr(void) { zaehler++; //BURST mit 40kHz if(zaehler < 17) { PORTC.1 = ~PORTC.1; PORTC.0 = 0; } else { PORTC.0 = 1; } if(zaehler==80) ACSR=ACSR | 0b00001000; //analogcomp interrupt aktivieren erst kurz nach burst damit nicht sofort interrupt ausgelöst wird zaehler=zaehler & 0x1ff ; //modulo 512=> alle 512 Interrupts wird ein neuer Burst gesendet } // Analog Comparator interrupt service routine interrupt [ANA_COMP] void ana_comp_isr(void) { winkel=zaehler; //der zaehler ACSR=ACSR & 0xF7; //interrupt wird nach dem 1. auslöser wieder deaktiviert damit bei weiteren ultraschall echos nicht ausgelöst wird } // Declare your global variables here void main(void) { // Declare your local variables here int j,i; // Input/Output Ports initialization // 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 // Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out // State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0 PORTC=0x00; DDRC=0x7F; // 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=0x00; DDRD=0x00; // Timer/Counter 0 initialization // Clock source: System Clock // Clock value: Timer 0 Stopped TCCR0=0x00; TCNT0=0x00; // 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: 2000,000 kHz // Mode: CTC top=OCR2 // OC2 output: Disconnected ASSR=0x00; TCCR2=0x0A; TCNT2=0x00; OCR2=0x19; // External Interrupt(s) initialization // INT0: Off // INT1: Off MCUCR=0x00; // Timer(s)/Counter(s) Interrupt(s) initialization TIMSK=0x80; // USART initialization // Communication Parameters: 8 Data, 1 Stop, No Parity // USART Receiver: On // USART Transmitter: On // USART Mode: Asynchronous // USART Baud rate: 38400 UCSRA=0x00; UCSRB=0x18; UCSRC=0x86; UBRRH=0x00; UBRRL=0x19; // Analog Comparator initialization ^ // Analog Comparator: On // Analog Comparator Input Capture by Timer/Counter 1: On ACSR=0x04; SFIOR=0x00; // Global enable interrupts #asm("sei") while (1) { printf("%d\r",winkel); for(i=3000;i;i--) for(j=5;j;j--) ; }; }