PIC32 Config Bits for 40 mHz with internal Fast RC oscillator

1-Page 79 Config Set datasheet

2- http://microchip.wikidot.com/32bit:osc-overview

ConfigBitsBlinkLED.c

/*********************************************************************
 *
 *              CONFIG BITS W/ BLINKING LED example
 * The PIC32MC250F128x is a nice little chip that boosts up to 50MHz. 
 * For applications where timing can be more lax, the use of the internal 
 * Fast RC oscillator is a good option to minimize component count, specially 
 * if you want simpler designs.
 * So, here are the config bits to have it running at 40 MHz with internal 
 * FRC oscillator .
 * The internal Fast RC Oscillator frequency is 8MHz and configured to be used 
 * with PLL; FRC(8MHz)/ FPLLIDIV (2 ) *FPLLMUL (20) /FPLLODIV (2) = 40MHz 
 * Frequency for the peripheral bus clock is left at same as the System Clock 
 * ( TPB=System Clock/PBDIV), as the divisor used is 1 (PBDIV=1)= 40MHz.
 * Also , FWDTEN = OFF // Watchdog Timer Enable OFF, and #pragma config JTAGEN = OFF 
 * // JTAG Enable OFF should be considered for use of the ports assigned to the
 *  JTAG port ( PORTB pins in this case-see datasheet for more info)
 * 
 * 
 *
 *********************************************************************
 * FileName:        ConfigBitsWLedBlink.c
 *
 * Processor:       PIC32MX250F128B
 * Dev Board:       Microstick II
 * Complier:        MPLAB C32 v2.01 or higher
 *                  MPLAB IDE v8.73 or higher
 *
 * Software License Agreement
 *
 * THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
 * WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
 * TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
 * IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 *
 * Author       Date            Comment
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *  RB        28/5/2015         Led should blink on and off.
 * 
 ********************************************************************/
#include < xc.h > // Blog code Bug : Shorten spaces to match <xc.h>
#include < plib.h > // Shorten spaces to match <plib.h> 
#include < p32xxxx.h >  // Shorten spaces to match <p32xxxx.h>
//#pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FPLLODIV = DIV_2, FWDTEN = OFF
//#pragma config POSCMOD = OFF, FNOSC = FRCPLL, FPBDIV = DIV_1
#pragma config   JTAGEN    = OFF    // JTAG Enable OFF
#pragma config   FNOSC     = FRCPLL // Fast RC w PLL 8mHz internal rc Osc
#pragma config   FPLLIDIV  = DIV_2  // PLL in 8mHz/2 = 4mHz
#pragma config   FPLLMUL   = MUL_20 // PLL mul 4mHz * 20 = 80mHz 24??
#pragma config   FPLLODIV  = DIV_2  // PLL Out 8mHz/2= 40 mHz system frequency osc
#pragma config   FPBDIV    = DIV_1  // Peripheral Bus Divisor
#pragma config   FCKSM     = CSECME // Clock Switch Enable, FSCM Enabled
#pragma config   POSCMOD   = OFF    // Primary osc disabled
#pragma config   IESO      = OFF    // Internal/external switch over
#pragma config   OSCIOFNC  = OFF    // CLKO Output Signal Active on the OSCO Pin
#pragma config   FWDTEN    = OFF    // Watchdog Timer Enable:
//
#define GetSystemClock()       (40000000ul)
#define GetPeripheralClock()    (GetSystemClock()/(1<<OSCCONbits.PBDIV))// 

main() {
    // Configure performance settings without changing PBDIV
    SYSTEMConfig(GetSystemClock(), SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE); 
    //Port Config
    mPORTAClearBits(BIT_0); //PORTA Bit 0 Clear bits to ensure light is off.
    mPORTASetPinsDigitalOut(BIT_0); //Set port RA0 as output
    // Variables
    int i;
    int j;

    while (1) { //main loop

        j = 100000;

        while (j--) { .
            mPORTAToggleBits(BIT_0); //Toggle light status. (Can be viewed in LATA SFR)

            i = j; //Time to wait in between toggle.
            while (i--) {
            } //Kill time.

            //j = j - 5000;     //Increase constant to increas blinking speed faster.
        } // while j--
    } // Main loop
} // Main

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