#include <xc.h>                 // XC8 General Include File 

#include <stdint.h>             // For uint8_t definition 

#include <stdbool.h>            // For true/false definition 

#pragma config WDT = OFF        // WDT disabled (control is placed on SWDTEN bit) 

#pragma config XINST = OFF      // Turn off support for extended instruction set 

#pragma config FOSC = HS        // HS oscillator 

unsigned int counter1 = 0; 

int x = 0; 

unsigned char packetDest [6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; // Multicast 

unsigned char packetSource [6] = {0xD8,0xD3,0x85,0x1F,0x11,0x01}; 

unsigned char packetTypeIP [2] = {0x08,0x00}; 

unsigned char packetIPHeader [12] = {0x45, 0x00, 0x00, 0x32, 0x11, 0xF7, 0x00, 0x00, 0x01, 0x11, 0x00, 0x00}; 

unsigned char packetIPSource [4] = {0xC0, 0xA8, 0x01,0x06}; 

unsigned char packetIPDest [4] = {0xE0, 0x00, 0x00,0xFC }; //broadcast 

void interrupt high_isr(void) 

{ 

    counter1++;                  //flash LED 

    if(counter1 == 20000) 

    { 

        ETXSTH = 0x00; 

        ETXSTL = 0x40; 

        EDATA = 0; 

        for (x=0; x<6 ;x++){ 

            EDATA = packetDest[x]; 

        } 

        for (x=0; x<6 ;x++){ 

            EDATA = packetSource[x]; 

        } 

        for (x=0; x<2 ;x++){ 

            EDATA = packetTypeIP[x]; 

        } 

        for (x=0; x<12 ;x++){ 

            EDATA = packetIPHeader[x]; 

        } 

        for (x=0; x<4 ;x++){ 

            EDATA = packetIPSource[x]; 

        } 

        for (x=0; x<4 ;x++){ 

            EDATA = packetIPDest[x]; 

        } 

        for (x=0; x<30 ;x++){ 

            EDATA = 0x01; 

        } 

        ECON1bits.TXRST = 1; 

        PORTBbits.RB4 = !PORTBbits.RB4;     //toggle LED        counter1 = 0; 

    } 

    INTCONbits.TMR0IF = 0;      // clear interrupt-flag 

} 

void low_priority interrupt low_isr(void){ 

    // will never happen 

} 

void main(void) 

{ 

    INTCONbits.GIE = 1;        // enable global interrupts 

    INTCONbits.TMR0IF = 0;     // clear interrupt-flag 

    INTCONbits.TMR0IE = 1;     // enable interrupt for timer0 

    T0CONbits.T0CS = 0;        // clock source: 0 = internal clock, 1 = external clock 

    T0CONbits.TMR0ON = 1;       // switch timer0 on 

    //Ethernet Setup 

     ECON2bits.ETHEN = 1; 

     ERXST = 0; 

     ERXND = 0x3F; 

     ERXRDPTL = 0x3F; 

     ERXRDPTH = 0x00; 

    ECON2bits.AUTOINC = 1; 

    ECON1bits.TXRST = 0; 

    ECON1bits.RXRST = 0; 

    ECON1bits.CSUMEN = 0; 

    ECON1bits.RXEN = 0;    // dont receiv, i just wanna send 

    while(!ESTATbits.PHYRDY); 

    TRISBbits.RB4 = 0;                 // init LED 

    PORTBbits.RB4 = 0;                  // 

    PORTBbits.RB4 = !PORTBbits.RB4;     // 

    MACON1bits.MARXEN = 1; 

    MACON3bits.PADCFG0 = 1; 

    MACON3bits.PADCFG1 = 1; 

    MACON3bits.PADCFG2 = 1; 

    MACON3bits.TXCRCEN = 1; 

    MACON3bits.FULDPX = 0; 

    MACON3bits.FRMLNEN = 1; // ? 

    MACON4bits.DEFER = 1; 

    MAMXFL = 1518; 

    MABBIPG = 0x12; 

    MAIPGL = 0x12; 

    MAIPGH = 0xC; 

    MAADR1 = 0x01; 

    MAADR2 = 0x11; 

    MAADR3 = 0x1F; 

    MAADR4 = 0x85; 

    MAADR5 = 0xD3; 

    MAADR6 = 0xD8; 

    while(1);}