📄 ethernet.lst
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C51 COMPILER V7.07 ETHERNET 06/30/2006 16:21:46 PAGE 1
C51 COMPILER V7.07, COMPILATION OF MODULE ETHERNET
OBJECT MODULE PLACED IN ethernet.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE ethernet.c LARGE OPTIMIZE(SIZE) BROWSE
stmt level source
1 #include <reg52.h>
2 #include <absacc.h>
3 #include <string.h>
4 #include <stdio.h>
5 #include "reg_ne2k.h"
6 #include "ethernet.h"
7
8 sbit HW_RESET=0xb4;
9 BYTE mymac[MACLEN];
10
11 typedef struct { /* NIC hardware packet header */
12 BYTE stat; /* Error status */
13 BYTE next; /* Pointer to next block */
14 WORD len; /* Length of this frame incl. CRC */
15 } NICHDR;
16 NICHDR nichdr;
17
18 void delay_ms(int number);
19 void resetnic();
20 void getnic(WORD addr,BYTE buf[],WORD len);
21 void putnic(WORD addr,BYTE buf[],WORD len);
22 BYTE nicwrap(BYTE page);
23
24 //***************************************************
25 // 接收数据包,将8019中的数据包读入指定的数据包缓冲区pkt,帧头读入nichdr结构中
26 // 全局变量 nichdr
27 // 全局变量 next_packet
28 // 返回：如果接收到数据包，返回数据包长度len,(该长度为减去校验和长度)
29 // 否则 ： 0
30 // get packet into buffer,return length (excel CRC ),or 0 if no available
31 //***************************************************
32 WORD get_ethernet(void *efp)
33 {
34 1 WORD current_offset;
35 1 BYTE curr_page;
36 1 BYTE bnry;
37 1
38 1 if (EN0_ISR &0x10) resetnic();
39 1 /* Get the Receive Page, CURR */
40 1 EN_CMD = EN_NODMA + EN_PAGE1 + EN_START;
41 1 curr_page = EN1_CURPAG;
42 1 EN_CMD = EN_NODMA + EN_PAGE0 + EN_START;
43 1 bnry=EN0_BOUNDARY+1; /* Get the BOUNDARY Register */
44 1 if (bnry>RX_STOP_PG) bnry=RX_START_PG;
45 1 /* Remove one frame from the ring. Boundary is always a page behind. */
46 1 // if (curr_page==0) return (0);
47 1 if (bnry!=curr_page)
48 1 {
49 2 current_offset = (WORD)(bnry << 8);
50 2 /* Get the header of this packet */
51 2 memset(&nichdr,0xee,sizeof(nichdr));
52 2 getnic(current_offset, (BYTE *)&nichdr,sizeof(nichdr));
53 2 nichdr.len=(nichdr.len/256)+((nichdr.len %256)<<8);
54 2 //keil c 在结构中使用该方法时,编译器编译的不正确(keil c bug)
55 2 // nichdr.len=(nichdr.len>>8)&0xff+(nichdr.len&0xff)<<8;
C51 COMPILER V7.07 ETHERNET 06/30/2006 16:21:46 PAGE 2
56 2 if ((nichdr.stat &0x01) && nichdr.len>=MINFRAMEC && nichdr.len<=MAXFRAMEC)
57 2 getnic(current_offset+sizeof(nichdr),(BYTE *)efp,nichdr.len-sizeof(nichdr));
58 2 if (nichdr.next>=RX_START_PG && nichdr.next<RX_STOP_PG)
59 2 bnry=nichdr.next;
60 2 else
61 2 bnry=nicwrap(bnry+1); //nic error
62 2 bnry=nicwrap(bnry-1);
63 2 EN0_BOUNDARY=bnry;
64 2 return (nichdr.len-sizeof(nichdr)-sizeof(ETHERHDR));
65 2 }
66 1 return (0);
67 1 }
68
69 //*************************************************************
70 // Send Ethernet packet give Len excl. CRC,return 0 if NIC busy
71 // 全局变量 locnode.mac (本地的以太物理地址 )
72 //
73 //*************************************************************
74 WORD put_ethernet(void *efp,WORD len)
75 {
76 1 if (EN_CMD & EN_TRANS) /* if still TXing,return 0 */
77 1 len=0;
78 1 else
79 1 {
80 2 len=min(MAXFRAME,max(len,MINFRAME));
81 2 EN_CMD=EN_PAGE0+EN_NODMA;
82 2 EN0_ISR=EN_RREAD+EN_START;
83 2 EN0_TCNTLO=(BYTE)(len & 0xff);
84 2 EN0_TCNTHI=(BYTE)(len>>8);
85 2 putnic(TX_START_PG<<8,(BYTE *)efp,len);
86 2 EN_CMD=EN_NODMA+EN_PAGE0+EN_TRANS;
87 2 }
88 1 return(len);
89 1 }
90
91 //*************************************************************
92 // reset nic (ne2000 compact 8019as)
93 //*************************************************************
94 void resetnic()
95 {
96 1 unsigned char c;
97 1
98 1 c = EN_RESET;
99 1 EN_RESET = c;
100 1 // HW_RESET = 1; /* Hardware RESET. when EN_RESET = 0; is Software */
101 1 delay_ms(10);
102 1 // HW_RESET = 0;
103 1 delay_ms(10);
104 1
105 1 EN_CMD = EN_PAGE0 + EN_NODMA + EN_STOP; /* 00001010B: PS1 PS0 RD2 RD1 RD0 TXP STA STP */
106 1 delay_ms(4);
107 1 // EN0_DCFG = ENDCFG_FT10 + ENDCFG_BMS + ENDCFG_BOS; /* ?FIFO treshold 8byte !!,normal operation, by
-te transfer mode selection */
108 1 /* Clear the remote byte count registers. */
109 1 EN0_DCFG = ENDCFG_FT10 + ENDCFG_BMS;
110 1 EN0_RCNTHI = 0x00; /* MSB remote byte count reg */
111 1 EN0_RCNTLO = 0x00; /* LSB remote byte count reg */
112 1
113 1 EN0_RXCR = E8390_RXOFF; /* RX configuration reg Monitor mode (no packet receive) */
114 1 EN0_TXCR = E8390_TXOFF; /* TX configuration reg set internal loopback mode */
115 1
116 1 EN0_TPSR = NE_START_PG;
C51 COMPILER V7.07 ETHERNET 06/30/2006 16:21:46 PAGE 3
117 1 EN0_STARTPG = RX_START_PG ; /* DMA START PAGE 46h */
118 1 /* Starting page of ring buffer. First page of Rx ring buffer 46h*/
119 1 EN0_STOPPG = NE_STOP_PG; /* Ending page +1 of ring buffer */
120 1 EN0_BOUNDARY = RX_START_PG; /* Boundary page of ring buffer */
121 1 EN0_ISR = 0xff; /* INTerrupt stauts reg */
122 1 EN0_IMR = 0; /* INTerrupt mask reg = Disable all Interrupt */
123 1
124 1
125 1 EN_CMD = EN_PAGE1 + EN_NODMA+EN_STOP;
126 1 delay_ms(4);
127 1 EN1_PAR0 = mymac[0];
128 1 EN1_PAR1 = mymac[1];
129 1 EN1_PAR2 = mymac[2];
130 1 EN1_PAR3 = mymac[3];
131 1 EN1_PAR4 = mymac[4];
132 1 EN1_PAR5 = mymac[5];
133 1 /* Initialize the multicast list to accept-all. If we enable multicast
134 1 the higher levels can do the filtering. multicast filter mask array (8 bytes) */
135 1 EN1_MAR0 = 0xff;
136 1 EN1_MAR1 = 0xff;
137 1 EN1_MAR2 = 0xff;
138 1 EN1_MAR3 = 0xff;
139 1 EN1_MAR4 = 0xff;
140 1 EN1_MAR5 = 0xff;
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