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Đo tần số bằng Input Capture

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  • Đo tần số bằng Input Capture

    Em đang có bài tập về đo tần số của encoder ạ
    Dù đã nghiên cứu ở rất nhiều nơi và cũng bỏ ra kha khá thời gian nhưng e vẫn chưa làm thành công. Không biết do code em sai hay là em đang hiểu nhầm bản chất nữa ạ
    Mong mọi người xem code và cho em lời khuyên. Chứ e cũng đang đau hết cả đầu lên nữa
    Do em mới học và phải tự học nên còn nhiều bỡ ngỡ và DÔT NÁT ^^, mong mọi người khai sáng ạ
    Em viết bằng codevision

    Code:
    /*******************************************************
    This program was created by the
    CodeWizardAVR V3.12 Advanced
    Automatic Program Generator
    © Copyright 1998-2014 Pavel Haiduc, HP InfoTech s.r.l.
    http://www.hpinfotech.com
    
    Project : 
    Version : 
    Date    : 04/11/2018
    Author  : 
    Company : 
    Comments: 
    
    
    Chip type               : ATmega32
    Program type            : Application
    AVR Core Clock frequency: 16.000000 MHz
    Memory model            : Small
    External RAM size       : 0
    Data Stack size         : 512
    *******************************************************/
    
    #include <mega32.h>
    
    // Alphanumeric LCD functions
    #include <alcd.h>
    #include <delay.h>
    #include <stdio.h>
    
    
    // Declare your global variables here
    double period=0, pre_val=0,over_step=0;
    double F, t1 ;
    char disF[17]; //cac chuoi tam de hien thi len LCD
    unsigned int x;
    
    // Timer1 overflow interrupt service routine
    interrupt [TIM1_OVF] void timer1_ovf_isr(void)
    {
    // Place your code here
    over_step+=0xFFFF;
    
    }
    
    // Timer1 input capture interrupt service routine
    interrupt [TIM1_CAPT] void timer1_capt_isr(void)
    {
    // Place your code here
        x=(unsigned int)(ICR1H <<8 + ICR1L);
        period= over_step + x-pre_val;    //tinh chu ky xung
        pre_val=x;                         // luu gia tri ICR1 cho lan sau
        over_step=0;
    
    }
    
    void main(void)
    {
    // Declare your local variables here
    
    // Input/Output Ports initialization
    // Port A initialization
    // Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
    DDRA=(0<<DDA7) | (0<<DDA6) | (0<<DDA5) | (0<<DDA4) | (0<<DDA3) | (0<<DDA2) | (0<<DDA1) | (0<<DDA0);
    // State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
    PORTA=(0<<PORTA7) | (0<<PORTA6) | (0<<PORTA5) | (0<<PORTA4) | (0<<PORTA3) | (0<<PORTA2) | (0<<PORTA1) | (0<<PORTA0);
    
    // Port B initialization
    // Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
    DDRB=(0<<DDB7) | (0<<DDB6) | (0<<DDB5) | (0<<DDB4) | (0<<DDB3) | (0<<DDB2) | (0<<DDB1) | (0<<DDB0);
    // State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
    PORTB=(0<<PORTB7) | (0<<PORTB6) | (0<<PORTB5) | (0<<PORTB4) | (0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (0<<PORTB0);
    
    // Port C initialization
    // Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
    DDRC=(0<<DDC7) | (0<<DDC6) | (0<<DDC5) | (0<<DDC4) | (0<<DDC3) | (0<<DDC2) | (0<<DDC1) | (0<<DDC0);
    // State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
    PORTC=(0<<PORTC7) | (0<<PORTC6) | (0<<PORTC5) | (0<<PORTC4) | (0<<PORTC3) | (0<<PORTC2) | (0<<PORTC1) | (0<<PORTC0);
    
    // Port D initialization
    // Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In 
    DDRD=(0<<DDD7) | (0<<DDD6) | (0<<DDD5) | (0<<DDD4) | (0<<DDD3) | (0<<DDD2) | (0<<DDD1) | (0<<DDD0);
    // State: Bit7=T Bit6=1 Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T 
    PORTD=(0<<PORTD7) | (1<<PORTD6) | (0<<PORTD5) | (0<<PORTD4) | (0<<PORTD3) | (0<<PORTD2) | (0<<PORTD1) | (0<<PORTD0);
    
    // Timer/Counter 0 initialization
    // Clock source: System Clock
    // Clock value: Timer 0 Stopped
    // Mode: Normal top=0xFF
    // OC0 output: Disconnected
    TCCR0=(0<<WGM00) | (0<<COM01) | (0<<COM00) | (0<<WGM01) | (0<<CS02) | (0<<CS01) | (0<<CS00);
    TCNT0=0x00;
    OCR0=0x00;
    
    // Timer/Counter 1 initialization
    // Clock source: System Clock
    // Clock value: 2000.000 kHz
    // Mode: Normal top=0xFFFF
    // OC1A output: Disconnected
    // OC1B output: Disconnected
    // Noise Canceler: Off
    // Input Capture on falling Edge
    // Timer Period: 32.768 ms
    // Timer1 Overflow Interrupt: On
    // Input Capture Interrupt: On
    // Compare A Match Interrupt: Off
    // Compare B Match Interrupt: Off
    TCCR1A=(0<<COM1A1) | (0<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
    TCCR1B=(0<<ICNC1) | (1<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (0<<CS11) | (1<<CS10);
    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: Timer2 Stopped
    // Mode: Normal top=0xFF
    // OC2 output: Disconnected
    ASSR=0<<AS2;
    TCCR2=(0<<PWM2) | (0<<COM21) | (0<<COM20) | (0<<CTC2) | (0<<CS22) | (0<<CS21) | (0<<CS20);
    TCNT2=0x00;
    OCR2=0x00;
    
    // Timer(s)/Counter(s) Interrupt(s) initialization
    TIMSK=(0<<OCIE2) | (0<<TOIE2) | (1<<TICIE1) | (0<<OCIE1A) | (0<<OCIE1B) | (1<<TOIE1) | (0<<OCIE0) | (0<<TOIE0);
    
    // External Interrupt(s) initialization
    // INT0: Off
    // INT1: Off
    // INT2: Off
    MCUCR=(0<<ISC11) | (0<<ISC10) | (0<<ISC01) | (0<<ISC00);
    MCUCSR=(0<<ISC2);
    
    // USART initialization
    // USART disabled
    UCSRB=(0<<RXCIE) | (0<<TXCIE) | (0<<UDRIE) | (0<<RXEN) | (0<<TXEN) | (0<<UCSZ2) | (0<<RXB8) | (0<<TXB8);
    
    // Analog Comparator initialization
    // Analog Comparator: Off
    // The Analog Comparator's positive input is
    // connected to the AIN0 pin
    // The Analog Comparator's negative input is
    // connected to the AIN1 pin
    ACSR=(1<<ACD) | (0<<ACBG) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIC) | (0<<ACIS1) | (0<<ACIS0);
    SFIOR=(0<<ACME);
    
    // ADC initialization
    // ADC disabled
    ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADATE) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);
    
    // SPI initialization
    // SPI disabled
    SPCR=(0<<SPIE) | (0<<SPE) | (0<<DORD) | (0<<MSTR) | (0<<CPOL) | (0<<CPHA) | (0<<SPR1) | (0<<SPR0);
    
    // TWI initialization
    // TWI disabled
    TWCR=(0<<TWEA) | (0<<TWSTA) | (0<<TWSTO) | (0<<TWEN) | (0<<TWIE);
    
    // Alphanumeric LCD initialization
    // Connections are specified in the
    // Project|Configure|C Compiler|Libraries|Alphanumeric LCD menu:
    // RS - PORTA Bit 0
    // RD - PORTA Bit 1
    // EN - PORTA Bit 2
    // D4 - PORTA Bit 4
    // D5 - PORTA Bit 5
    // D6 - PORTA Bit 6
    // D7 - PORTA Bit 7
    // Characters/line: 16
    lcd_init(16);
    
    // Global enable interrupts
    #asm("sei")
    
    delay_ms(100);
    
    
        lcd_clear();
        lcd_gotoxy(0,0);
        lcd_puts("MACH DO TAN SO");
    
    while (1)
          {
          // Place your code here  
          t1=(double)period; //chu ky
          F=(double)16000000/t1;    //tinh bang ms 
          sprintf(disF, "Tan so: %.1f",F);//doi so F sang dang chuoi, chua trong disF
          lcd_gotoxy(0,1);    
          lcd_puts(disF);
          delay_ms(100);
    
        }
    }

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