programming problem in 7segment display


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    Join Date
    Apr 2012
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    Default programming problem in 7segment display

    programming problem in 7segment display

    hi every one..
    i'm facing some problem in my projects. i worked it on proteus and i have attached some snaps shot of my project. i'm reading analog i/p from RA2 and display it on 4 7-segments devices. i used 74ls78 bcd to 7 segment decoder and 74ls138 decoder. i've copied my source code too with this. the fig1 shows the intial setup and fig2 shows the during execution of the project. i think the problem with the code it self.. when i simulate in proteus only one device is active and its always shows zero (0) irrespective of analog input. i want to display the result on 7 segment so please go through the code and let me know if is there any changes have to make in this.
    code:

    #include<16f877.h>
    unsigned int cnt, brk;
    char led [3];
    unsigned int rem;
    void converter (unsigned int z);
    void scanled (void);
    void main()
    {
    OPTION_REG=0x80;
    PORTA=0;
    TRISA=255;
    PORTD=0;
    TRISD=0;
    while(1)
    {
    cnt=ADC_Read(2);
    cnt=cnt*5;
    converter (cnt);
    scanled ();
    }
    }
    void converter(unsigned int z)
    {
    led[0]=z/1000;
    rem=z%1000;
    led[1]=rem/100;
    rem=rem%100;
    led[2]=rem/10;
    led[3]=rem%10;
    }
    void scanled (void)
    {
    unsigned char i;
    for (i=0;i<4;i++)
    {
    portd=i;portd=led[i];delay_ms(10);
    }
    }
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