clock.c

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/*
 * File:   clock.c
 * Author: Chris Hajduk
 *
 * Created on September 8, 2015, 11:16 PM
 */
#include "../AttitudeManager/main.h"
#include "clock.h"

void useFRCPLLClock(){
    // Configure PLL prescaler, PLL postscaler, PLL divisor
    PLLFBD = 41; // M = 43
    CLKDIVbits.PLLPOST=0; // N2 = 2
    CLKDIVbits.PLLPRE=0; // N1 = 2
    // Initiate Clock Switch to Internal FRC with PLL (NOSC = 0b001)
    __builtin_write_OSCCONH(0x01);
    __builtin_write_OSCCONL(0x01);
    // Wait for Clock switch to occur
    while (OSCCONbits.COSC != 0b001);
    // Wait for PLL to lock
    while(OSCCONbits.LOCK != 1) {};
}