// This function is to initialise the CCP1 module to Pulse Width Modulation mode.
void PWM1_init(void)
{
PR2=0xFF; //set PWM period; PWM period = [(PR2) + 1] 4 TOSC (TMR2 prescale value)
CCPR1L=0x00; //set the PWM dutycyle to 0
CCP1CON=0x00;
TRISC&=0xFB; //Make the CCP1 pin an output
T2CON=0x07; //Post-scale at 1:1 and Prescale at 16s
}
// This function is to initialise the CCP2 module to Pulse Width Modulation mode.
void PWM2_init(void)
{
PR2=0xFF; //set PWM period; PWM period = [(PR2) + 1] 4 TOSC (TMR2 prescale value)
CCPR2L=0x00; //set the PWM dutycyle to 0
CCP2CON=0x00;
TRISC&=0xFD; //Make the CCP2 pin an output
T2CON=0x07; //Post-scale at 1:1 and Prescale at 16s
}
// This function changes the duty cycle of Pulse Width Modulation module 1.
void PWM1_ChangeDutyCycle(char ccpr1l, char ccp1con)
{
// The duty cycle (DC) of PWM is represented in a 10-bit data. IF DC=100%, data=0x3FF. IF DC=50%, data=0x1FF.
// CCP1L = data<10:3>
// CCP1CON = data<2:1>.F
//Eg. if setting the PWM dutycyle to 50% : ccpr1l=0x7F, ccp1con=0x3F
CCPR1L=ccpr1l;
CCP1CON=ccp1con;
}
// This function changes the duty cycle of Pulse Width Modulation module 2.
void PWM2_ChangeDutyCycle(char ccpr2l, char ccp2con)
{
// The duty cycle (DC) of PWM is represented in a 10-bit data. IF DC=100%, data=0x3FF. IF DC=50%, data=0x1FF.
// CCP1L = data<10:3>
// CCP1CON = data<2:1>.F
//Eg. if setting the PWM dutycyle to 50% : ccpr2l=0x7F, ccp2con=0x3F
CCPR2L=ccpr2l;
CCP2CON=ccp2con;
}
