MACRAW Application Note?

TCP/IP Chip W5500
3

Dear Zick,

As you know, MACRAW can handle the Ethernet frame.

  • The received MACRAW data format
    |-- data length (2byte) --|-- DATA packet (with data length) --|

*Pseudo code for MACRAW mode
(ref. code: wizwiki.net/wiki/lib/exe/fetch.p … legacy.zip / socket.c)

  1. macraw_open
void macraw_open(void)
{
  uint8 sock_num;
  uint16 dummyPort = 0;
  uint8 mFlag = 0;
  sock_num = 0; [u]// socket number '0' can only support[/u]

  close(sock_num); // Close the 0-th socket
  socket(sock_num, Sn_MR_MACRAW, dummyPort,mFlag);  // OPen the 0-th socket with MACRAW mode
}
  1. macraw_send
uint16 macraw_send( const uint8 * buf, uint16 len )
{
   uint16 ret=0;
   uint8 sock_num;
   sock_num =0;

   if (len > getIINCHIP_TxMAX(sock_num)) ret = getIINCHIP_TxMAX(sock_num); // check size not to exceed MAX size.
   else ret = len;

   send_data_processing(sock_num, (uint8 *)buf, len);

   //W5500 SEND COMMAND
   IINCHIP_WRITE(Sn_CR(sock_num),Sn_CR_SEND);
   while( IINCHIP_READ(Sn_CR(sock_num)) );
   while ( (IINCHIP_READ(Sn_IR(sock_num)) & Sn_IR_SEND_OK) != Sn_IR_SEND_OK );
   IINCHIP_WRITE(Sn_IR(sock_num), Sn_IR_SEND_OK);

   return ret;
}
  1. macraw_recv
uint16 macraw_recv( uint8 * buf, uint16 len )
{
   uint8 sock_num;
   uint16 data_len=0;
   uint16 dummyPort = 0;
   uint16 ptr = 0;
   uint8 mFlag = 0;
   sock_num = 0;

   if ( len > 0 )
   {

      data_len = 0;

      ptr = IINCHIP_READ(Sn_RX_RD0(sock_num));
      ptr = (uint16)((ptr & 0x00ff) << 8) + IINCHIP_READ( Sn_RX_RD1(sock_num) );
      //-- read_data(s, (uint8 *)ptr, data, len); // read data
      data_len = IINCHIP_READ_RXBUF(0, ptr);
      ptr++;
      data_len = ((data_len<<8) + IINCHIP_READ_RXBUF(0, ptr)) - 2;
      ptr++;

      if(data_len > 1514)
      {
         printf("data_len over 1514\r\n");
         printf("\r\nptr: %X, data_len: %X", ptr, data_len);
         //while(1);
         /** recommand : close and open **/
         close(sock_num); // Close the 0-th socket
         socket(sock_num, Sn_MR_MACRAW, dummyPort,mFlag);  // OPen the 0-th socket with MACRAW mode
         return 0;
      }

      IINCHIP_READ_RXBUF_BURST(sock_num, ptr, data_len, (uint8*)(buf));
      ptr += data_len;

      IINCHIP_WRITE(Sn_RX_RD0(sock_num),(uint8)((ptr & 0xff00) >> 8));
      IINCHIP_WRITE(Sn_RX_RD1(sock_num),(uint8)(ptr & 0x00ff));
      IINCHIP_WRITE(Sn_CR(sock_num), Sn_CR_RECV);
      while( IINCHIP_READ(Sn_CR(sock_num)) ) ;
   }

   return data_len;
}

Thanks,

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