发布时间 : 星期五 文章（论文）01130090204- 基于ENC28J60的网络模块设计 - 图文更新完毕开始阅读a0c99b2727d3240c8447effa
天津职业技术师范大学2013届本科生毕业设计
// check if a packet has been received and buffered
if( !(encRead(EIR) & EIR_PKTIF) )
return 0;
// Make absolutely certain that any previous packet was discarded// MACDiscardRx();
encWrite(ERDPTL, (NextPacketPtr)); encWrite(ERDPTH, (NextPacketPtr)>>8); // read the next packet pointer
NextPacketPtr = encReadOp(ENC28J60_READ_BUF_MEM, 0); NextPacketPtr |= encReadOp(ENC28J60_READ_BUF_MEM, 0)<<8; // read the packet length
len = encReadOp(ENC28J60_READ_BUF_MEM, 0); len |= encReadOp(ENC28J60_READ_BUF_MEM, 0)<<8; // read the receive status
rxstat = encReadOp(ENC28J60_READ_BUF_MEM, 0); rxstat |= encReadOp(ENC28J60_READ_BUF_MEM, 0)<<8;
// (we reduce the MAC-reported length by 4 to remove the CRC) if(len > 336)
len = 336;
/if( WasDiscarded == FALSE)
// Set the read pointer to the start of the received packet
// limit retrieve length
// copy the packet from the receive buffer encReadBuffer(len, rxdnet->bytedata.bytebuf+4);
// Move the RX read pointer to the start of the next received packet // This frees the memory we just read out
}
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encWrite(ERXRDPTL, (NextPacketPtr)); encWrite(ERXRDPTH, (NextPacketPtr)>>8);
encWriteOp(ENC28J60_BIT_FIELD_SET, ECON2, ECON2_PKTDEC);
// decrement the packet counter indicate we are done with this packet return len;
天津职业技术师范大学2013届本科生毕业设计
附录2:主程序
#include \#include \#include \#include \
extern union NetNode myNode; extern union netcard rxdnetbuf; extern union netcard txdnetbuf; int main(void) {
unsigned int num_bytes; OSCCAL = 0x9A;
myNode.node.mask = IP4_ADDR(0,255,255,255); myNode.node.gate = IP4_ADDR(1,1,168,192); myNode.node.mac[0] = 0x00; myNode.node.mac[1] = 0x60; myNode.node.mac[2] = 0x97; myNode.node.mac[3] = 0x48; myNode.node.mac[4] = 0xF4;
myNode.node.mac[5] = 0xAB; /*ENC Initialisieren*/
encInit(); //Mac Adresse setzen(stack.h, dort wird auch die Ip nicSetMacAddress(); /* Leds konfigurieren
LEDA : Link status
LEDB : Receive & Send activity
Led Settings : enc28j60 datasheet, page 11*/
myNode.node.ip = IP4_ADDR(218,1,168,192);
festgelegt)
encPhyWrite(0x14,0b0000010001110000); arptab_init();
{ // Unload packet from the receive buffer and store in
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while(1)
天津职业技术师范大学2013届本科生毕业设计
num_bytes = encPacketReceive(&rxdnetbuf);
if(num_bytes > 0) {
if(rxdnetbuf.etherframe.protocal==ARP_PACKET) { }
// 收到一个IP包
{ }
else if(rxdnetbuf.arpframe.operation==0x0200) { }
arp_process(); //ARP answer
arp_answer(); //ARP request,处理arp数据包
//表示收到一个arp请求包
if(rxdnetbuf.arpframe.operation==0x0100)
else if((rxdnetbuf.etherframe.protocal == IP_PACKET)
&& ((rxdnetbuf.ipframe.verandihl&0xf0) == 0x40) // IP V4 && (rxdnetbuf.ipframe.destip[0] == myNode.nodebytes.ipbytes[0]) && (rxdnetbuf.ipframe.destip[1] == myNode.nodebytes.ipbytes[1]) && (rxdnetbuf.ipframe.destip[2] == myNode.nodebytes.ipbytes[2]) && (rxdnetbuf.ipframe.destip[3] == myNode.nodebytes.ipbytes[3])) // my IP
{
arp_ip_mac();
if(rxdnetbuf.ipframe.protocal == 1) { }
else if(rxdnetbuf.ipframe.protocal == 17) // udp {
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// ICMP // echo
if(rxdnetbuf.icmpframe.type == 8) { }
ping_answer();
天津职业技术师范大学2013届本科生毕业设计
} else {
{ }
// tcp_rcve(&rxdnetbuf); // net_udp_rcv();}
// tcp
else if(rxdnetbuf.ipframe.protocal == 6)
//Lib_Uart_SendString(\
}
//updatearptab();
// IEEE 802 pkt rejected
} } }
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天津职业技术师范大学2013届本科生毕业设计
致 谢
对于XX老师和XX老师给予我的关怀和指导，我不甚感激。从最初的定题，到资料收集，到写作、修改，再到论文定稿，XX老师给了我耐心的指导和无私的帮助。两位老师在学术等方面的造诣令我敬佩不已，在XX老师和XX老师那里学到的知识让我终生受益。同时，感谢任课老师和同学们在这期间给予我的指导和帮助，是他们教会了我专业知识，教会了我如何学习。正是由于他们，我才能在各方面取得显著的进步，在此向他们表示我由衷的谢意。
感谢天津职业技术师范大学，感谢自动化与电气工程学院，给我提供了一个学习知识的平台和一个向前进步的机会。我将铭记我是一名天职师大人，在今后的学习和工作中谨记“动手动脑，全面发展”的校训，并以此鞭策自己，努力把优良传统发扬光大。
最后，衷心感谢为评阅本论文付出辛勤劳动的专家和教授们。
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