rtl8019dev.c

00001 #include "net/uip.h"
00002 #include "dev/rtl8019dev.h"
00003 
00004 /*****************************************************************************
00005 *  Module Name:       Realtek 8019AS Driver Interface for uIP-AVR Port
00006 *
00007 *  Created By:        Louis Beaudoin (www.embedded-creations.com)
00008 *
00009 *  Original Release:  September 21, 2002
00010 *
00011 *  Module Description:
00012 *  Provides three functions to interface with the Realtek 8019AS driver
00013 *  These functions can be called directly from the main uIP control loop
00014 *  to send packets from uip_buf and uip_appbuf, and store incoming packets to
00015 *  uip_buf
00016 *
00017 *  September 30, 2002 - Louis Beaudoin
00018 *    Modifications required to handle the packet receive function changes in
00019 *      rtl8019.c.  There is no longer a need to poll for an empty buffer or
00020 *      an overflow.
00021 *    Added support for the Imagecraft Compiler
00022 *
00023 *****************************************************************************/
00024 
00025 
00026 #define IP_TCP_HEADER_LENGTH 40
00027 #define TOTAL_HEADER_LENGTH (IP_TCP_HEADER_LENGTH+ETHERNET_HEADER_LENGTH)
00028 
00029 
00030 
00031 void RTL8019dev_init(void)
00032 {
00033   initRTL8019();
00034 }
00035 
00036 
00037 void RTL8019dev_send(void)
00038 {
00039   RTL8019beginPacketSend(uip_len);
00040   
00041   // send packet, using data in uip_appdata if over the IP+TCP header size
00042   if( uip_len <= TOTAL_HEADER_LENGTH ) {
00043     RTL8019sendPacketData(uip_buf, uip_len);
00044   } else {
00045     uip_len -= TOTAL_HEADER_LENGTH;
00046     RTL8019sendPacketData(uip_buf, TOTAL_HEADER_LENGTH);
00047     RTL8019sendPacketData((unsigned char *)uip_appdata, uip_len);
00048   }
00049   
00050   RTL8019endPacketSend();
00051 }
00052 
00053 
00054 
00055 unsigned int RTL8019dev_poll(void)
00056 {
00057   unsigned int packetLength;
00058         
00059   packetLength = RTL8019beginPacketRetreive();
00060 
00061   // if there's no packet or an error - exit without ending the operation
00062   if( !packetLength )
00063     return 0;
00064 
00065   // drop anything too big for the buffer
00066   if( packetLength > UIP_BUFSIZE )
00067   {
00068     RTL8019endPacketRetreive();
00069     return 0;
00070   }
00071         
00072   // copy the packet data into the uIP packet buffer
00073   RTL8019retreivePacketData( uip_buf, packetLength );
00074   RTL8019endPacketRetreive();
00075                 
00076   return packetLength;
00077 }
00078 
00079 
00080 void RTL8019dev_exit(void)
00081 {
00082 }

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