How to pass a 10 bit value to two registers?

Question

I'm trying to pass the value of DC to both CCPR1L, DC1B1, and DC1B0, right now I am doing it manually, but is there a way of using the value of DC directly?

void SetDCPWM1(unsigned int DC){
    CCPR1L = 0b01011010;
    DC1B1 = 0;
    DC1B0 = 0;
}

Right now Im not using DC , because I dont know how to correctly pass the value to the registers. DC is a 10 bit value , DC1B1 and DC1B0 must have bits 1 and 2 and CCPR1L must have bits 3 - 10.

Answer 1

Assuming that the 10-bits of the PWM duty cycle are the low 10-bits of the function parameter then this should do what you have asked for.

void SetDCPWM1(unsigned int DC){
    CCPR1L = (DC >> 2);
    DC1B1 = 0;
    DC1B0 = 0;
    if (DC & 2) DC1B1 = 1;
    if (DC & 1) DC1B0 = 1;
}

This code should address the comment from Mike :

void SetDCPWM1(unsigned int DC){
    CCP1CONbits.DC1B = (unsigned char)(DC) & 0x03;
    CCPR1L = (unsigned char)(DC>>2);
}

Further the two LSBs of the PWM duty cycle are now updated in the same instruction cycle.