#include <xc.h>
#include <math.h>
 
#define _XTAL_FREQ 8000000
#define SINE_TABLE_SIZE 32
 
unsigned char sineTable[SINE_TABLE_SIZE];
 
void generateSineTable() {
    for (int i = 0; i < SINE_TABLE_SIZE; i++) {
        sineTable[i] = (unsigned char)((sin(2 * M_PI * i / SINE_TABLE_SIZE) + 1) * 127.5);
    }
}
 
void setPWMDuty(unsigned char dutyCycle) {
    CCPR1L = dutyCycle >> 2;
    CCP1CONbits.DC1B = dutyCycle & 3;
}
 
void setupPWM() {
    TRISCbits.TRISC2 = 0;
    T2CONbits.T2CKPS = 0b11;
    PR2 = 199;
    CCP1CONbits.CCP1M = 0b1100;
    CCPR1L = 0;
    CCP1CONbits.DC1B = 0;
    T2CONbits.TMR2ON = 1;
}
 
void main() {
    unsigned char index = 0;
    generateSineTable();
    setupPWM();
 
    while (1) {
        setPWMDuty(sineTable[index]);
        index = (index + 1) % SINE_TABLE_SIZE;
        __delay_ms(5);
    }
}
 

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