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Knight Rider

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1. Preprocessor Directives:

  • #include <pic.h>: Includes the header file pic.h, which contains definitions and declarations specific to PIC microcontrollers.
  • #define _XTAL_FREQ 4000000: Defines a preprocessor constant _XTAL_FREQ with the value 4000000, representing the crystal frequency in Hertz. This value is used by the compiler to calculate delay times and other timing-related calculations.

2. main() Function:

  • Initialization:

    • PORTC = 0xff;: Sets all bits of PORTC to 1.
    • TRISC = 0x00;: Configures all pins of PORTC as outputs.

  • Main Loop:

    • First For Loop:

      • Iterates from 0 to 1 (effectively executing once).
      • Sets individual bits of PORTC to 1, one at a time, and delays for 100ms between each bit setting. This creates a sequential lighting effect from left to right.

    • Second For Loop:

      • Iterates from 0 to 1 (effectively executing once).
      • Sets individual bits of PORTC to 1, starting from the rightmost bit and moving left, and delays for 100ms between each bit setting. This creates a sequential lighting effect from right to left.

Explanation:

The code implements a simple LED-based lighting effect on a PIC microcontroller, controlling the individual bits of PORTC to create a sequential lighting pattern.

  • The first for loop lights up the LEDs from left to right, starting with the leftmost LED and gradually illuminating the others.
  • The second for loop lights up the LEDs from right to left, starting with the rightmost LED and gradually illuminating the others.


#include<pic.h>
#define _XTAL_FREQ 4000000
void main()
{
unsigned char i;
PORTC=0xff;
TRISC=0x00;
    for(i=0; i<1; i++)
    {
PORTC=0X01;
__delay_ms(100);
    PORTC=0X02;
__delay_ms(100);
    PORTC=0X04;
__delay_ms(100);
    PORTC=0X08;
__delay_ms(100);
    PORTC=0X100;
__delay_ms(100);
    PORTC=0X20;
__delay_ms(100);
    PORTC=0X40;
__delay_ms(100);
    PORTC=0X80;
__delay_ms(100);
   
    }
for(i=0; i<1; i++)
    {
    PORTC=0X80;
__delay_ms(100);
    PORTC=0X40;
__delay_ms(100);
    PORTC=0X20;
__delay_ms(100);
    PORTC=0X100;
__delay_ms(100);
    PORTC=0X08;
__delay_ms(100);
    PORTC=0X04;
__delay_ms(100);
    PORTC=0X02;
__delay_ms(100);
    PORTC=0X01;
__delay_ms(100);
   
    }
}






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