📄 eth.lst
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C51 COMPILER V7.09 ETH 07/27/2007 15:11:24 PAGE 1
C51 COMPILER V7.09, COMPILATION OF MODULE ETH
OBJECT MODULE PLACED IN ETH.obj
COMPILER INVOKED BY: F:\Keil\C51\BIN\C51.EXE tcp\ETH.C LARGE BROWSE DEBUG OBJECTEXTEND PRINT(.\ETH.lst) OBJECT(ETH.obj)
line level source
1 //-----------------------------------------------------------------------------
2 // Copyright (c) 2002 Jim Brady
3 // Do not use commercially without author's permission
4 // Last revised August 2002
5 // Net ETH.C
6 //
7 // This module is the Ethernet layer
8 //-----------------------------------------------------------------------------
9
10 #include <stdlib.h>
11 #include "net.h"
12 #include "serial.h"
13 #include "arp.h"
14 #include "ip.h"
15 #include "eth.h"
16 #include "utils.h"
17 #include "CP220x_ETH.h" // Include CP220x Ethernet Routines
18
19 //bit txd_buffer_select=0; //选择网卡的发送缓冲区
20 extern UCHAR debug;
21 extern UCHAR arpbuf[];
22 extern UCHAR my_hwaddr[];
23
24 void Delay1ms(unsigned char T);
25
26 extern UCHAR rcve_buf_allocated;
27 extern uint volatile event_word;
28
29
30
31 #define Rtl8019ResetLow P5 &= ~(0x4); // P52
32 #define Rtl8019ResetHigh P5 |= 0x4; // P52
33
34 //------------------------------------------------------------------------
35 // Initialize the Cirrus Logic 8019 chip
36 //------------------------------------------------------------------------
37
38 void ReadRtl8019NodeID(void)//读出网卡的物理地址存到my_ethernet_address.bytes[6]里
39 {
40 1 unsigned char i;
41 1 for (i=0;i<6;i++)
42 1 {
43 2 // my_hwaddr[i]=reg10;
44 2 // my_hwaddr[i]=reg10;
45 2 }
46 1 }
47
48
49 //------------------------------------------------------------------------
50 // This functions checks 8019 status then sends an ethernet
51 // frame to it by calling an assembler function.
52 //------------------------------------------------------------------------
53
54 void send_frame(UCHAR * outbuf, uint len)/*发送一个数据包的命令,长度最小为60字节,最大1514字节*/
55 {
C51 COMPILER V7.09 ETH 07/27/2007 15:11:24 PAGE 2
56 1 CP220x_SendD(outbuf, len);
57 1 // s3c44b0_eth_send(outbuf, len);
58 1 // printf("send packet\n");
59 1 }
60
61 //------------------------------------------------------------------------
62 // This functions checks the 8019 receive event status
63 // word to see if an ethernet frame has arrived. If so,
64 // set EVENT_ETH_ARRIVED bit in global event_word
65 //------------------------------------------------------------------------
66 void query_8019(void)
67 {
68 1
69 1 }
70
71 //------------------------------------------------------------------------
72 // This function gets an incoming Ethernet frame from the 8019.
73 // There may be more than 1 waiting but just allocate memory for
74 // one and read one in. Use the 8019 to queue incoming packets.
75 //------------------------------------------------------------------------
76 UCHAR * rcve_frame()//如果收到一个有效的数据包,返回收到的数据,否则返回NULL
77 {
78 1 // UCHAR bnry,curr,next_page;
79 1 //
80 1 // uint len, ii;
81 1 // UCHAR temp;
82 1 // UCHAR * buf;
83 1 // if (buf_head!= buf_tail)
84 1
85 1 return NULL;
86 1 }
87
88
89 void eth_send(UCHAR * outbuf, UCHAR * hwaddr, uint ptype, uint len)
90 {
91 1 ETH_HEADER * eth;
92 1
93 1 eth = (ETH_HEADER *)outbuf;
94 1
95 1 // Add 14 byte Ethernet header]
96 1 //Ethernet V2标准:14 = 目的MAC地址6 byte + 源MAC地址6 byte + 类型(2) = 14, 不包括LLC层
97 1 //现不支持: 802.3标准. MAC数据报文最小长度46 - 1500字节。小于46, 填充0;
98 1
99 1 memcpy((char*)eth->dest_hwaddr, hwaddr, 6); //目的MAC地址6 byte
100 1 memcpy((char*)eth->source_hwaddr, my_hwaddr, 6); //源MAC地址6 byte
101 1 eth->frame_type = ptype; //类型2 byte. 比如0x0800, 表示上层使用IP数据包. =0x8137,
-表示为Novell IPX发过来。
102 1 #ifdef __LITTLEENDIAN__
eth->frame_type = ntohs(eth->frame_type);
#endif
105 1
106 1 // We just added 14 bytes to length
107 1 send_frame(outbuf, len + 14);
108 1 }
109
110 //------------------------------------------------------------------------
111 // This is the handler for incoming Ethernet frames
112 // This is designed to handle standard Ethernet (RFC 893) frames
113 // See "TCP/IP Illustrated, Volume 1" Sect 2.2
114 //------------------------------------------------------------------------
115 void eth_rcve(uint Length, UCHAR* inbuf)
116 {
C51 COMPILER V7.09 ETH 07/27/2007 15:11:24 PAGE 3
117 1 ETH_HEADER * eth;
118 1
119 1 eth = (ETH_HEADER *)inbuf;
120 1
121 1 #ifdef __LITTLEENDIAN__
eth->frame_type = ntohs(eth->frame_type);
#endif
124 1
125 1 // Reject frames in IEEE 802 format where Eth type field
126 1 // is used for length. Todo: Make it handle this format
127 1 if (eth->frame_type < 1520)
128 1 {
129 2 return;
130 2 }
131 1 //printf("frame_type %x", eth->frame_type);
132 1 // Figure out what type of frame it is from Eth header
133 1 // Call appropriate handler and supply address of buffer
134 1 switch (eth->frame_type)
135 1 {
136 2 case ARP_PACKET:
137 2 arp_rcve(inbuf);
138 2 break;
139 2
140 2 case IP_PACKET:
141 2 #ifdef __LITTLEENDIAN__
eth->frame_type = ntohs(eth->frame_type);
#endif
144 2 ip_rcve(inbuf);
145 2 break;
146 2
147 2 default:
148 2
149 2 break;
150 2 }
151 1 }
*** WARNING C280 IN LINE 115 OF TCP\ETH.C: 'Length': unreferenced local variable
152
153
154
155
156
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 255 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- 18
PDATA SIZE = ---- ----
DATA SIZE = ---- ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 1 WARNING(S), 0 ERROR(S)
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