Question

我们必须制作数字秒表，其中一项要求是开关。为了做到这一点，我有一个变量来看看是否按下开关并从那里开始......但是它没有停止，它只是启动它。

这是我的代码......有没有人有任何想法，为什么它不起作用？任何帮助都会很棒。

#include <p24fj128ga010.h>
#include "main.h"

_CONFIG2( FNOSC_FRCPLL & OSCIOFNC_OFF );    // Internal oscillator - 4xPLL giving 16 MIPS
                                            // pin RC15 has the oscillator                                      
//Function prototypes
extern void update_display(const unsigned int min, const unsigned int tens, const unsigned int units, const unsigned int tenths, const unsigned int hund);

//Global variables
unsigned int minutes;       //Minutes - For display 0
unsigned int units;         //Seconds (tens) - For display 1 
unsigned int tens;          //Seconds (units) - For display 2
unsigned int tenths;        //Tenths of a second - For display 3
unsigned int hund;          
unsigned int displayOn=0;   //Switch for Display ON or OFF - shared by two ISR routines
unsigned int IC1BUFFERVAL;  //Used to read IC1 timer buffer
char switch1 =0;
unsigned int IC2BUFFERVAL;  //Used to read IC2 timer buffer


io_port_A *display = (io_port_A*)&LATA;   // Address of Output latch (that connects to PORTA) - it is SAFER to write to the LATCH


//Main code                             
int main()
{
    //Configure the device to use the internal oscillator
    OSCCONbits.COSC  = 1u;  // Internal oscillator with PLL
    CLKDIVbits.RCDIV = 0u;  // Internal oscillator not divided (8MHz)
    CLKDIVbits.DOZEN =0;    // No post scaling
    CLKDIVbits.DOZE  =0;    //

    //set up ports
    TRISA = 0x0070;         //Least-significant 4 and most significant 8 bits are digital outputs
    LATA  = 0xFFFF;         //Write zero to PORTA via the latch

    //Initialisation of variables and display
    minutes = 0;
    units = 0;
    tens  = 0;
    tenths = 0;
    hund = 0;
    update_display(1,2,3,4,5);
    update_display(minutes, tens, units, tenths, hund);

    //TIMER1 Configuration Register
    T1CON           = 0;
    T1CONbits.TCKPS = 0b11; //Prescale = 256
    TMR1            = 0;    //Reset Timer Counter

    //Configure TIMER1 interrupt         
    _T1IP = 4;              //Interrupt priority = 4 
    PR1   = 625-1;         //Period Register - set for 0.1s. Took a 0 out to make hund work.
    _T1IF = 0;              //Clear timer interrupt flag

    //Configure the input capture (IC1)
    _IC1IP = 4;         //Set interrupt priority for the Input Capture
    _TRISD8 = 1;        //Set RD8 to be an input
    IC1CON = 0x0003;    //InputCaptureCONfiguration register - falling edge, 3 makes it rising
    _IC1IF = 0;       //Reset the Input Capture 1 Interrupt Flag

    //Configure the input capture (IC2)             //button 2 initialisation
    _IC2IP = 4;         //Set interrupt priority for the Input Capture
    _TRISD9 = 1;        //Set RD9 to be an input
    IC2CON = 0x0003;    //InputCaptureCONfiguration register - rising edge
    _IC2IF = 0;


    //Configure the input capture (IC3)
    _IC3IP = 4;         //Set interrupt priority for the Input Capture
    _TRISD10 = 1;        //Set RD8 to be an input
    IC3CON = 0x0003;    //InputCaptureCONfiguration register - falling edge
    _IC3IF = 0;         //Reset the Input Capture 1 Interrupt Flag

    //ENABLE INTERRUPTS
    _IC1IE = 1;         //Set the Input Capture 1 Interrupt Enable
    _IC2IE = 1;         //Set the Input Capture 2 Interrupt Enable
    _IC3IE = 1;         //Set the Input Capture 3 Interrupt Enable
    _T1IE  = 1;         //Switch on timer 1 interrupt enable

    //Main Loop
    while (1)
    {
        Idle();     //Switch off main core - peripherals continue       
        update_display(minutes, tens, units, tenths, hund);
    } //end while

    return 0;
}


//************************************************************************
//********************* INTERRUPT SERVICE ROUTINES ***********************
//************************************************************************

//ISR FOR THE TIMER
void __attribute__((interrupt, no_auto_psv)) _T1Interrupt()
{
    //Increment the counter on every interrupt
    hund++;                

    //Update minutes, tens, units and tenths for the display (BCD)  

    //Check for an overflow - ripple to the next digit
    if (hund == 10)
    {
    hund = 0;
    tenths ++;
    }

    if (tenths == 10) {
        tenths = 0;
        units++;
    }
    if (units == 10) {
        units = 0;
        tens++;
    }
    if (tens == 6) {
        tens = 0;
        minutes++;
    }        
    if (minutes == 10) {
        minutes=0;
    }    
    update_display(minutes, tens, units, tenths, hund);
    //Reset interrrupt flag before returning
    _T1IF = 0;              
}    

//ISR FOR THE INPUT CAPTURE
void __attribute__((interrupt, no_auto_psv)) _IC1Interrupt()
{
    // INSERT CODE TO HANDLE INPUT CAPTURE (IC1) INTERRUPT
        if(switch1==1)
    {
        T1CONbits.TON = 0;
            switch1=0;
    }

        if (switch1==0)
        {   
            T1CONbits.TON = 1;
            switch1=1;
        }
    //Read the IC1 buffer (we are not using this yet)     
    IC1BUFFERVAL = IC1BUF;  //This is needed to prevent buffer overflow    

    _IC1IF = 0;                 //Reset the interrupt flag  
}

Answer 1

在你最后的__ attribute__函数中，你忘记了第二个if之前的其他内容。

第一个if，当为true时，将设置切换为零。在它之后，您正在检查开关是否为零并将其设置为1。因此永远不会离开1的状态。

如果不是，那就去做别的......

if(switch1==1)
{
    T1CONbits.TON = 0;
        switch1=0;
}
else if(switch1==0)  //HERE
{   
   ...
}

不知道为什么我的代码不起作用

1 个答案: