cpu/avr/dev/rtl8019dev.c

   1 #include "net/uip.h"
   2 #include "dev/rtl8019dev.h"
   3
   4 /*****************************************************************************
   5 *  Module Name:       Realtek 8019AS Driver Interface for uIP-AVR Port
   6 *
   7 *  Created By:        Louis Beaudoin (www.embedded-creations.com)
   8 *
   9 *  Original Release:  September 21, 2002
  10 *
  11 *  Module Description:
  12 *  Provides three functions to interface with the Realtek 8019AS driver
  13 *  These functions can be called directly from the main uIP control loop
  14 *  to send packets from uip_buf and uip_appbuf, and store incoming packets to
  15 *  uip_buf
  16 *
  17 *  September 30, 2002 - Louis Beaudoin
  18 *    Modifications required to handle the packet receive function changes in
  19 *      rtl8019.c.  There is no longer a need to poll for an empty buffer or
  20 *      an overflow.
  21 *    Added support for the Imagecraft Compiler
  22 *
  23 *****************************************************************************/
  24
  25
  26 #define IP_TCP_HEADER_LENGTH 40
  27 #define TOTAL_HEADER_LENGTH (IP_TCP_HEADER_LENGTH+ETHERNET_HEADER_LENGTH)
  28
  29
  30
  31 void RTL8019dev_init(void)
  32 {
  33   initRTL8019();
  34 }
  35
  36
  37 void RTL8019dev_send(void)
  38 {
  39   RTL8019beginPacketSend(uip_len);
  40
  41   // send packet, using data in uip_appdata if over the IP+TCP header size
  42   if( uip_len <= TOTAL_HEADER_LENGTH ) {
  43     RTL8019sendPacketData(uip_buf, uip_len);
  44   } else {
  45     uip_len -= TOTAL_HEADER_LENGTH;
  46     RTL8019sendPacketData(uip_buf, TOTAL_HEADER_LENGTH);
  47     RTL8019sendPacketData((unsigned char *)uip_appdata, uip_len);
  48   }
  49
  50   RTL8019endPacketSend();
  51 }
  52
  53
  54
  55 unsigned int RTL8019dev_poll(void)
  56 {
  57   unsigned int packetLength;
  58
  59   packetLength = RTL8019beginPacketRetreive();
  60
  61   // if there's no packet or an error - exit without ending the operation
  62   if( !packetLength )
  63     return 0;
  64
  65   // drop anything too big for the buffer
  66   if( packetLength > UIP_BUFSIZE )
  67   {
  68     RTL8019endPacketRetreive();
  69     return 0;
  70   }
  71
  72   // copy the packet data into the uIP packet buffer
  73   RTL8019retreivePacketData( uip_buf, packetLength );
  74   RTL8019endPacketRetreive();
  75
  76   return packetLength;
  77 }
  78
  79
  80 void RTL8019dev_exit(void)
  81 {
  82 }