📄 main.lst
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221 3 {
222 4 uart_frame_space=0;
223 4 uart_receive_enable=true;
224 4 }
225 3 }
226 2 }
227 1 if (uart_trans_willing)
228 1 {
229 2 uart_trans_willing=false;
230 2 TI=1;
231 2 }
232 1
233 1 if (being_echo)
234 1 {
235 2 net_overtime_count++;
236 2 if (net_overtime_count>18000)
237 2 {
238 3 being_echo=0;
239 3 if (first_arp)
240 3 first_arp=0;
241 3 else
C51 COMPILER V7.50 MAIN 12/23/2005 11:15:15 PAGE 5
242 3 remote_echo=1;
243 3 net_overtime_count=0;
244 3 }
245 2 }
246 1 runtime++;
247 1 dog++;
248 1 }
249
250 /*************************************************************************/
251 // 串口中断程序，该程序在认为串口的接收是终端在响应串口的发送
252 // 在串口未发送完成之前，不处理完罗接收的数据
253 /*************************************************************************/
254 void uart_interrupt(void) interrupt 4
255 {
256 1 if (RI)
257 1 {
258 2 RI=0;
259 2 if ((!uart_received_finished)&& uart_receive_enable)
260 2 {
261 3 if (!uart_receiving)
262 3 {
263 4 uart_receiving=1;
264 4 uart_receive_count=0;
265 4 uart_receive_buf[uart_receive_count++]=SBUF;
266 4 }
267 3 else
268 3 {
269 4 uart_char_space=0;
270 4 uart_receive_buf[uart_receive_count++]=SBUF;
271 4 }
272 3 }
273 2 }
274 1 if (TI)
275 1 {
276 2 TI=0;
277 2 if (uart_trans_count<uart_trans_length)
278 2 {
279 3 ACC=uart_trans_buf[uart_trans_count++];
280 3 TB8=P;
281 3 SBUF=ACC;
282 3 }
283 2 else
284 2 {
285 3 uart_trans_finished=1;
286 3 uart_trans_count=0;
287 3 uart_trans_length=0;
288 3 }
289 2
290 2 }
291 1 }
292
293 //*******************************************************************************
294 /* Receive a UDP datagram: return non-0 if client state-change */
295 int udp_receive(ETHERFRAME *efp, int len)
296 {
297 1 UDPKT *udp;
298 1 int ret=0;
299 1 NODE loc, rem;
300 1 udp = (UDPKT *)efp->edata;
301 1 getudp_srce(efp, &rem); /* Get srce & dest nodes */
302 1 getudp_locdest(efp, &loc);
303 1 if (loc.port == locnode.port) /* Client response */
C51 COMPILER V7.50 MAIN 12/23/2005 11:15:15 PAGE 6
304 1 {
305 2 // UDP 将数据拷贝至串口接收缓冲区，置接收完成标志(在合并方式)
306 2 // UDP 将数据拷贝至串口发送缓冲区，置发送标志(在模块方式)
307 2 EA=0;
308 2 memcpy(uart_trans_buf+uart_trans_length,udp->udpdata,len);
309 2 uart_trans_length=uart_trans_length+len;
310 2 uart_trans_finished=0;
311 2 if (uart_trans_count==0)
312 2 uart_trans_willing=1;
313 2 EA=1;
314 2 ret = CLIENT_DONE; /* ..and exit */
315 2 }
316 1 else if (loc.port == ECHOPORT) /* Echo req: resend data */
317 1 udp_transmit(efp, &loc, &rem, udp->udpdata, len);
318 1 return(ret);
319 1 }
320
321 /*****************************************************************/
322 //本机的网络处理子程序
323 //
324 /*****************************************************************/
325 int do_net_process(ETHERFRAME *efp,int rxlen)
326 {
327 1 ARPKT *arp;
328 1 IPKT *ip;
329 1 ICMPKT *icmp;
330 1 NODE node;
331 1 int txlen;
332 1 int len;
333 1 int ret=0;
334 1 ip=(IPKT *)efp->edata;
335 1 if (is_arp(efp,rxlen))
336 1 {
337 2 arp = (ARPKT *)efp->edata;
338 2
339 2 if (arp->op==ARPREQ && arp->dip==locnode.ip)
340 2 { /* ARP request? */
341 3 node.ip = arp->sip; /* Make ARP response */
342 3 memcpy(node.mac, arp->smac, MACLEN);
343 3 txlen = make_arp(efp, &locnode, &node, ARPRESP);
344 3 put_ethernet(efp, txlen); /* Send packet */
345 3 }
346 2 if (arp->op==ARPRESP && arp->dip==locnode.ip)
347 2 { /* ARP response? */
348 3 memcpy(remnode.mac,arp->smac, MACLEN);
349 3 being_echo=0;
350 3 if (first_arp)
351 3 first_arp=0;
352 3 else
353 3 remote_echo=1;
354 3 ret = ARP_RX;
355 3 }
356 2 }
357 1 else if ((rxlen=is_ip(efp, rxlen))!=0) /* IP datagram? */
358 1 if (ip->i.dip==locnode.ip || ip->i.dip==BCASTIP)
359 1
360 1 {
361 2 getip_srce(efp, &node);
362 2 if ((len=is_icmp(ip, rxlen))!=0) /* ICMP? */
363 2 {
364 3 icmp = (ICMPKT *)ip;
365 3 if (icmp->c.type == ICREQ) /* Echo request? */
C51 COMPILER V7.50 MAIN 12/23/2005 11:15:15 PAGE 7
366 3 {
367 4 len = (WORD)max(len, 0); /* Make response */
368 4 txlen = make_icmp(efp, &locnode, &node, ICREP,
369 4 icmp->c.codetype, (WORD)len);
370 4 put_ethernet(efp, txlen); /* Send packet */
371 4 }
372 3 // else if (icmp->c.type == ICUNREACH)
373 3 // printf("\r\nICMP: destination unreachable\r\n");
374 3 }
375 2 else if ((len=is_udp(ip, rxlen))!=0) /* UDP? */
376 2 {
377 3 ret = udp_receive(efp, max(len, 0));
378 3 }
379 2 }
380 1 return (ret);
381 1 }
382
383 //**********************************
384 void flush_gate_mac()
385 {
386 1 int ret;
387 1 remote_echo=0;
388 1 remnode.mac[0]=0xff;
389 1 remnode.mac[1]=0xff;
390 1 remnode.mac[2]=0xff;
391 1 remnode.mac[3]=0xff;
392 1 remnode.mac[4]=0xff;
393 1 remnode.mac[5]=0xff;
394 1 ret=make_arp(ðerframe,&locnode, &remnode, ARPREQ); //请求网关或控制主机的物理地址
395 1 put_ethernet(ðerframe,ret);
396 1 being_echo=1;
397 1 }
398 //************************************************
399 void do_uart_process(void)
400 {
401 1 if (being_echo==0) // 1 arp wait response
402 1 {
403 2 if (remote_echo==0)
404 2 {
405 3 if (!memcmp(remnode.mac, bcast, MACLEN))
406 3 flush_gate_mac();
407 3 else
408 3 send_ip();
409 3 }
410 2 else
411 2 {
412 3 remote_echo=0;
413 3 send_ip();
414 3 }
415 2 }
416 1 }
417
418 //************************************************
419 void send_ip(void)
420 {
421 1 int ret;
422 1 memcpy((BYTE *)ðerframe+sizeof(ETHERHDR)+sizeof(IPHDR)+sizeof(UDPHDR),uart_receive_buf,uart_receive
-_count);
423 1 remnode.port=locnode.port;
424 1 ret=make_udp(ðerframe, &locnode,&remnode,(WORD)(uart_receive_count));
425 1 uart_received_finished=0;
426 1 uart_receive_count=0;
C51 COMPILER V7.50 MAIN 12/23/2005 11:15:15 PAGE 8
427 1 put_ethernet(ðerframe,ret);
428 1 }
429
430
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 2092 ----
CONSTANT SIZE = 6 ----
XDATA SIZE = 2075 96
PDATA SIZE = ---- ----
DATA SIZE = 1 ----
IDATA SIZE = ---- ----
BIT SIZE = 8 ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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