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  • Learning PIC Coding using C Language

    shahrul

    Member

    Updated: Oct 26, 2024
    Views: 958
    Here, I'm sharing PIC C Language for coding various type of hardware. I'm using MPLab Software with Hi-Tech Compiler.

    Firstly, I start with LED. You can connect LED to PIC by 2 ways.
    [​IMG]
    ​
    Let say you connect Active High LED on Port B0. Signal High will turn 'ON' LED and signal Low will turn 'OFF' LED.
    You can program like
    RB0=1;      //Turn ON LED
RB0=0;      //Turn OFF LED
    or
    PORTB=0b00000001;      //Turn ON LED
PORTB=0b00000000;      //Turn OFF LED
    To do LED Blinking
    for( ; ; ){  //loop forever
           PORTB=0b00000001;      //Turn ON LED
           for(i=0;i<=100;i++) __delay_ms(10);
           PORTB=0b00000000;      //Turn OFF LED
           for(i=0;i<=100;i++) __delay_ms(10);}
    0
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  • shahrul

    Member • Jan 7, 2010

    How to connect seven segment display?
    Actually, seven segment display not much differ with LED. The seven segment display is only like 8 LED's. 2 way of connection.
    [​IMG]

    You do 'ON' and 'OFF' depending the position of the LED. Convert into this function.
    char convert(char dec)
{char segment;
switch(dec){
case 0:segment=0b11111100;break;
case 1:segment=0b01100000;break;
case 2:segment=0b11011010;break;
case 3:segment=0b11110010;break;
case 4:segment=0b01100110;break;
case 5:segment=0b10110110;break;
case 6:segment=0b10111110;break;
case 7:segment=0b11100000;break;
case 8:segment=0b11111110;break;
case 9:segment=0b11110110;break;}
return segment;
}
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  • Codes Guides

    Member • Jan 17, 2010

    Good posts. In my experience, PICs do better sinking current than sourcing. I would recommend connecting the LEDs so that the PIC sinks the currents.

    - CG
    #-Link-Snipped-#
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  • shahrul

    Member • Jan 18, 2010

    Codes Guides
    Good posts. In my experience, PICs do better sinking current than sourcing. I would recommend connecting the LEDs so that the PIC sinks the currents.
    Yes, that's good. Thank you for sharing experience. I know but I did't follow, I still do sourcing current.
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  • Codes Guides

    Member • Jan 19, 2010

    Newer PICs may be better. Old ones used to drop a lot of voltage when sourcing current.
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  • shahrul

    Member • Feb 11, 2010

    How to read push button?
    You can connect push button in two ways.
    [​IMG]
    At example, I have 4 push button, then I convert the input into value. Any push button need to press and released.
    int read_button()
{int i;
if(PB1==0){
    while(PB1==0) continue;    //wait until PB1 release
    i=1;}
else if(PB2==0){
    while(PB2==0) continue;    //wait until PB2 release
    i=2;}
else if(PB3==0){
    while(PB3==0) continue;    //wait until PB3 release
    i=3;}
else if(PB4==0){
    while(PB4==0) continue;    //wait until PB4 release
    i=4;}
else i=0;
return i;
}
    ​
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