#include <xc.h>
 
// Configuration bits
#pragma config FOSC = HS
#pragma config WDTE = OFF
#pragma config PWRTE = ON
#pragma config BOREN = ON
#pragma config LVP = OFF
#pragma config CPD = OFF
#pragma config WRT = OFF
#pragma config CP = OFF
 
#define _XTAL_FREQ 20000000
 
void PWM_Init()
{
    TRISC2 = 0;      // CCP1 pin as output
 
    // PWM Frequency ≈ 5 kHz
    PR2 = 249;
 
    CCP1CON = 0x0C;  // PWM mode
 
    T2CON = 0x04;    // Timer2 ON, Prescaler 1
 
    CCPR1L = 0;      // Initial duty cycle
}
 
void PWM_SetDuty(unsigned int duty)
{
    if(duty > 1023)
        duty = 1023;
 
    CCPR1L = duty >> 2;
 
    CCP1CONbits.DC1B0 = duty & 0x01;
    CCP1CONbits.DC1B1 = (duty & 0x02) >> 1;
}
 
void ADC_Init()
{
    ADCON0 = 0x41;   // AN0 selected, ADC ON
    ADCON1 = 0x80;   // Right justified
}
 
unsigned int ADC_Read()
{
    GO_nDONE = 1;
 
    while(GO_nDONE);
 
    return ((ADRESH << 8) + ADRESL);
}
 
void main()
{
    unsigned int adcValue;
 
    PWM_Init();
    ADC_Init();
 
    while(1)
    {
        adcValue = ADC_Read();    // 0–1023 from potentiometer
 
        PWM_SetDuty(adcValue);    // Control motor speed
 
        __delay_ms(10);
    }
}

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