// CONFIG
#pragma config FOSC = HS        // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF       // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON       // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = OFF      // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF        // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming disabled)
#pragma config CPD = OFF        // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF        // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF         // Flash Program Memory Code Protection bit (Code protection off)

#define _XTAL_FREQ 20000000
#define TMR2PRESCALE 4



long PWM_freq = 5000;

PWM_Initialize()
{
    PR2 = (_XTAL_FREQ/(PWM_freq*4*TMR2PRESCALE)) - 1; 			// Setting the PR2 formulae using Datasheet // Makes the PWM work in 5KHZ
    CCP1M3 = 1; CCP1M2 = 1;  						// Configure the CCP1 module 
    T2CKPS0 = 1; T2CKPS1 = 0; TMR2ON = 1; 				// Configure the Timer module
    TRISC2 = 0; 							// make port pin on C as output
}

PWM_Duty(unsigned int duty)
{
      if(duty<1023)
  {

    duty = ((float)duty/1023)*(_XTAL_FREQ/(PWM_freq*TMR2PRESCALE)); 	// On reducing //duty = (((float)duty/1023)*(1/PWM_freq)) / ((1/_XTAL_FREQ) * TMR2PRESCALE);
    CCP1X = duty & 1; 							// Store the 1st bit
    CCP1Y = duty & 2; 							// Store the 0th bit
    CCPR1L = duty>>2;							// Store the remining 8 bit
  }
}

void ADC_Initialize()
{
  ADCON0 = 0b01000001; 							// ADC ON and Fosc/16 is selected
  ADCON1 = 0b11000000; 							// Internal reference voltage is selected
}
unsigned int ADC_Read(unsigned char channel)
{
  ADCON0 &= 0x11000101; 						// Clearing the Channel Selection Bits
  ADCON0 |= channel<<3; 						// Setting the required Bits
  __delay_ms(2); 							// Acquisition time to charge hold capacitor
  GO_nDONE = 1; 							// Initializes A/D Conversion
  while(GO_nDONE); 							// Wait for A/D Conversion to complete
  return ((ADRESH<<8)+ADRESL); 						// Returns Result
}

void main()
{
  int adc_value;
  TRISC = 0x00; 							// PORTC as output
  TRISA = 0xFF; 							// PORTA as input
  TRISD = 0x00;

  ADC_Initialize(); 							// Initializes ADC Module
  PWM_Initialize();  							// This sets the PWM frequency of PWM1

  do
  {
    adc_value = ADC_Read(4); 						// Reading Analog Channel 0 
    PWM_Duty(adc_value);
    
      __delay_ms(50); 
      
  }while(1); 								// Infinite Loop
  
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

#include <iostream>
#include <string>
using namespace std;

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}