ENC28J60 Pattern Match filter

#define Spi_Ethernet_HALFDUPLEX     0x00
#define Spi_Ethernet_FULLDUPLEX     0x01

#define EPMOH    0x15  // Bank1
#define EPMOL    0x14  // Bank1
#define EPMM7    0x0F  // Bank1
#define EPMM6    0x0E  // Bank1
#define EPMM5    0x0D  // Bank1
#define EPMM4    0x0C  // Bank1
#define EPMM3    0x0B  // Bank1
#define EPMM2    0x0A  // Bank1
#define EPMM1    0x09  // Bank1
#define EPMM0    0x08  // Bank1
#define EPMCSH   0x11  // Bank1
#define EPMCSL   0x10  // Bank1
#define ERXFCON  0x18  // Bank1
#define EIE      0x1B  // Any bank
#define EIR      0x1C  // Any bank
#define ECON1    0x1F  // Any bank

// required by library
sfr sbit SPI_Ethernet_Rst at RC1_bit;
sfr sbit SPI_Ethernet_CS  at RC2_bit;
sfr sbit SPI_Ethernet_Rst_Direction at TRISC1_bit;
sfr sbit SPI_Ethernet_CS_Direction  at TRISC2_bit;

typedef struct {
  unsigned canCloseTCP: 1; 
  unsigned isBroadcast: 1; 
} TEthPktFlags;

unsigned char   myMacAddr[6] = {0x00, 0x14, 0xA5, 0x76, 0x19, 0x3f} ;   // my MAC address
unsigned char   myIpAddr[4]  = {192, 168, 20, 60} ;                     // my IP address

unsigned int SPI_Ethernet_UserTCP(unsigned char *remoteHost, unsigned int remotePort, unsigned int localPort, unsigned int reqLength, TEthPktFlags *flags) {
  return 0;                                     
}

unsigned int SPI_Ethernet_UserUDP(unsigned char *remoteHost, unsigned int remotePort, unsigned int destPort, unsigned int reqLength, TEthPktFlags *flags) {

  unsigned int len;                             
 
  if (destPort != 10001) return 0;                                   
 
  len = 3;
 
  SPI_Ethernet_putByte('O');
  SPI_Ethernet_putByte('k');
  SPI_Ethernet_putByte(0);
 
  return(len);                                 
}

/* EPMOH:EPMOL = 0x0006              ->  offset
   EPMCSH:EPMCSL = 0xDEE9         ->   checksum
   EPMM7:EPMM0 = 0x0000000000001F00 ->  mask bits */
   
void set_rx_filter() {
   char tmp, tmp2;
   
   tmp = SPI_Ethernet_readReg(ECON1);              //
   
   SPI_Ethernet_writeReg(ECON1, (tmp & 0b11111100));  // clear banksel bits
   SPI_Ethernet_writeReg(ECON1, (tmp | 1));           // goto bank1
   
   SPI_Ethernet_writeReg(EPMOH, 0x00);
   SPI_Ethernet_writeReg(EPMOL, 0x06);

   SPI_Ethernet_writeReg(EPMCSH, 0xDE);
   SPI_Ethernet_writeReg(EPMCSL, 0xE9);

   SPI_Ethernet_writeReg(EPMM7, 0x00);
   SPI_Ethernet_writeReg(EPMM6, 0x00);
   SPI_Ethernet_writeReg(EPMM5, 0x00);
   SPI_Ethernet_writeReg(EPMM4, 0x00);
   SPI_Ethernet_writeReg(EPMM3, 0x00);
   SPI_Ethernet_writeReg(EPMM2, 0x00);
   SPI_Ethernet_writeReg(EPMM1, 0x1F);
   SPI_Ethernet_writeReg(EPMM0, 0x00);

   tmp2 = SPI_Ethernet_readReg(ERXFCON);
   
   tmp2 |= 0b00010000;
   SPI_Ethernet_writeReg(ERXFCON, tmp2);  // enable pattern match filter

   SPI_Ethernet_writeReg(ECON1, tmp);
}

void main() {
   TRISA = 0; TRISB = 0; TRISD = 0xC0; TRISE = 0; TRISC = 0;
   LATA = 0; LATB = 0; LATC = 0; LATD = 0; LATE = 0;

   CM1CON0 = 0;
   CM2CON0 = 0;

   ANSELA = 0;
   ANSELB = 0;         
   ANSELC = 0;
   ANSELD = 0;
   ANSELE = 0;   

   SPI1_Init();
   SPI_Ethernet_Init(myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX);
   
   set_rx_filter();
   
   while (1) {
      SPI_Ethernet_doPacket();
   }
}