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/*
     * file: main.c
     * target: PIC18LF45K50
     * IDE: MPLABX v5.10
     * Compiler: XC8 v1.45
     *
     *                           PIC18LF45K50
     *                    +---------:_:---------+
     * 10K pull-up RE3 -> :  1 VPP       PGD 40 : <> RB7
     *             RA0 <> :  2           PGC 39 : <> RB6
     *         LED RA1 <> :  3               38 : <> RB5
     *             RA2 <> :  4               37 : <> RB4
     *             RA3 <> :  5               36 : <> RB3
     *             RA4 <> :  6               35 : <> RB2
     *             RA5 <> :  7               34 : <> RB1
     *             RE0 <> :  8          INT0 33 : <> RB0
     *             RE1 <> :  9               32 : <- VDD 3v3
     *             RE2 <> : 10               31 : <- VSS GND
     *         3v3 VDD -> : 11               30 : <> RD7
     *         GND VSS -> : 12               29 : <> RD6
     *             RA7 <> : 13 OSC1          28 : <> RD5
     *             RA6 <> : 14 OSC2          27 : <> RD4
     *             RC0 <> : 15 SOSCO         26 : <> RC7
     *             RC1 <> : 16 SOSCI         25 : <> RC6
     *             RC2 <> : 17 CCP1          24 : <> D+
     *        3v3 VUSB -> : 18               23 : <> D-
     *             RD0 <> : 19               22 : <> RD3
     *             RD1 <> : 20               21 : <> RD2
     *                    +---------------------+
     *                            DIP-40
     *
     * Description:
     *
     * This applicaiton toggles the RA1 output hight for 250 millseconds then low for 250 millseconds.
     *
     * See: https://electronics.stackexchange.com/questions/417447/pic-microcontroller-not-working-without-pickit3
     *
     * The circuit does not have much going on,Power supply and Pull up resistor
     * is connected and Pin-3 is supposed to give out pulses. Configured to work
     * with internal oscillator. MCLR pin is pulled up with 10K resistor.
     */
    #include <xc.h>
    /*
     * PIC configuration words
     */
    #pragma config PLLSEL = PLL3X, CFGPLLEN = ON, CPUDIV = NOCLKDIV
    #pragma config LS48MHZ = SYS48X8, FOSC = INTOSCIO, PCLKEN = OFF
    #pragma config FCMEN = OFF, IESO = OFF, nPWRTEN = OFF, BOREN = OFF
    #pragma config BORV = 190, nLPBOR = OFF, WDTEN = SWON, WDTPS = 32768
    #pragma config CCP2MX = RC1, PBADEN = OFF, T3CMX = RC0, SDOMX = RB3
    #pragma config MCLRE = ON, STVREN = ON, LVP = OFF, ICPRT = OFF
    #pragma config XINST = OFF
    #pragma config CP0 = OFF, CP1 = OFF, CP2 = OFF, CP3 = OFF
    #pragma config CPB = OFF, CPD = OFF
    #pragma config WRT0 = OFF, WRT1 = OFF, WRT2 = OFF, WRT3 = OFF
    #pragma config WRTC = OFF, WRTB = OFF, WRTD = OFF
    #pragma config EBTR0 = OFF, EBTR1 = OFF, EBTR2 = OFF, EBTR3 = OFF
    #pragma config EBTRB = OFF

    /*
     * Constants Definition
     */
    #define _XTAL_FREQ (48000000UL)
    /*
     * Main application
     */
    void main( void )
    {
        INTCON = 0;             /* Disable all interrupt sources */
        PIE1 = 0;
        PIE2 = 0;
        INTCON3bits.INT1IE = 0;
        INTCON3bits.INT2IE = 0;

        OSCCON = 0x70;          /* set internal oscillator to 16MHz */

        /*
         * Application loop
         */
        ANSELAbits.ANSA1 = 0; /* make RA1 digital I/O    */
        TRISAbits.TRISA1 = 0; /* make RA1 digital output */
        LATAbits.LATA1   = 0; /* make RA1 output low     */
        for(;;)
        {
            LATAbits.LATA1   ^= 1; /* toggle RA1 output  */
            __delay_ms(250);
        }
    }