another knight Rider

Code Breakdown:

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 <htc.h>

#include <math.h>

#include "lcd.h"

//Chip Settings
__CONFIG(1,0x0200);
__CONFIG(2,0X1E1F);
__CONFIG(3,0X8100);
__CONFIG(4,0X00C1);
__CONFIG(5,0XC00F);


//Simple Delay Routine
void Wait(unsigned int delay)
{
   for(;delay;delay--)
      __delay_us(100);
}

//Function to Initialise the ADC Module
void ADCInit()
{
   //We use default value for +/- Vref

   //VCFG0=0,VCFG1=0
   //That means +Vref = Vdd (5v) and -Vref=GEN

   //Port Configuration
   //We also use default value here too
   //All ANx channels are Analog

   /*
      ADCON2

      *ADC Result Right Justified.
      *Acquisition Time = 2TAD
      *Conversion Clock = 32 Tosc
   */

   ADCON2=0b10001010;
}

//Function to Read given ADC channel (0-13)
unsigned int ADCRead(unsigned char ch)
{
   if(ch>13) return 0;  //Invalid Channel

   ADCON0=0x00;

   ADCON0=(ch<<2);   //Select ADC Channel

   ADON=1;  //switch on the adc module

   GODONE=1;//Start conversion

   while(GODONE); //wait for the conversion to finish

   ADON=0;  //switch off adc

   return ADRES;
}
void main()
{
   //Let the LCD Module start up
   Wait(100);

   //Initialize the LCD Module
   LCDInit(LS_BLINK);

   //Initialize the ADC Module

   ADCInit();

   //Clear the Module
   LCDClear();

   //Write a string at current cursor pos
   LCDWriteString("LM35 Test");
   LCDWriteStringXY(4,1,"Degree Celcius");

   while(1)
   {
      unsigned int val; //ADC Value

      unsigned int t;      //Temperature


      val=ADCRead(0);   //Read Channel 0

      t=round(val*0.48876);//Convert to Degree Celcius

      LCDWriteIntXY(0,1,t,3);//Prit IT!


      Wait(1000);
   }

}