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[操作系统]给Hi3518e的Uboot添加UDP广播收发功能


基于个人兴趣,决定实现一个和方案公司提供的uboot收发广播的功能。记录笔记如下。

SDK版本:Hi3518E_V100R001C01SPC081

1. 由于我手头的板子的Phy是RMII模式,因此先按这篇帖子进行将uboot默认的网络驱动改为RMII模式。

http://blog.csdn.net/skdkjzz/article/details/39931915

2. 然后设置好Phy的CONFIG_PHY_ADDR_U和CONFIG_PHY_ADDR_D,这个我不太懂是为什么,估计和硬件有关,各位看官可能这里不能完全照抄,我有空翻一翻Phy的规格书。编辑 u-boot-2010.06\include\configs\hi3518e.h

3. 在common目录下新建文件cmd_udp.c,新建一个uboot cmd

 1 #include <common.h> 2 #include <command.h> 3 #include <net.h> 4  5 char _ctoi(char c) 6 { 7   if(c>='0'&&c<='9')return c-'0'; 8   if(c>='a'&&c<='f')return c-'a'+10; 9   return 0; 10 } 11  12 int _atoi(char* s) 13 { 14   unsigned int a=0; 15   unsigned int b=0; 16   int i=0; 17   while(s[i]){ 18     a*=10; 19     a+=_ctoi(s[i]); 20     i++;   21   } 22   return a; 23 } 24  25 int _atox(char* s) 26 { 27   unsigned int a=0; 28   unsigned int b=0; 29   int i=0; 30   while(s[i]){ 31     a<<=4; 32     a|=_ctoi(s[i]); 33     i++;   34     if(i>=8)break; 35   } 36   return a; 37 } 38  39 int _strlen(char*s) 40 { 41   int i=0; 42   while(s[i]){ 43     i++; 44   } 45   return i; 46 } 47  48 void _getmac(char* s,char* eth) 49 { 50   unsigned char a=0; 51   int i=0; 52   while(s[i]){ 53     a<<=4; 54     a|=_ctoi(s[i]);       55     if((i&1)==1){ 56       eth[i>>1]=a; 57       a=0;       58     } 59     i++; 60   } 61 } 62  63 int do_udp_broadcast(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) 64 { 65   uchar eth[6]= {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 66   char* UdpServerIP="255.255.255.255"; 67   int dest_port = 25500, src_port =25300; 68   uchar *str; 69   int len; 70  71   switch(argc){ 72   case 1: 73     puts("Params error, try again\nusage: [udp_b] [string] or [udp_b] [dest_port] [src_port] [string]\n"); 74     return 1; 75     break; 76   case 2: 77     str = argv[1]; 78     len = strlen(str); 79     break; 80   case 4: 81     dest_port = _atoi(argv[1]); 82     src_port = _atoi(argv[2]); 83     str = argv[3]; 84     len = strlen(argv[3]); 85     break; 86   default: 87     return 1; 88     break; 89   } 90  91   printf("len=%d\n",len); 92   show_boot_progress(80); 93   if(NetLoop_UDP(eth,UdpServerIP,dest_port,src_port,str,len)<0){ 94     show_boot_progress(-81); 95     return 1; 96   } 97  98   return 0; 99 }100 101 U_BOOT_CMD(102   udp_b, 4, 1, do_udp_broadcast,103   "Send or receive UDP broadcast to/from server using UDP protocol",104   "[udp_b] [string] or [udp_b] [dest_port] [src_port] [string]"105 );

 

4. 给common目录的makefile添加

COBJS-$(CONFIG_CMD_UDP) += cmd_udp.o

5. 在net目录新建文件udp处理函数,udp.c和udp.h

udp.c

 1 #include <common.h> 2 #include <watchdog.h> 3 #include <command.h> 4 #include <net.h> 5 #include <miiphy.h> 6 #include "udp.h" 7  8 void 9 UdpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len) //这个函数是处理包,先放下,有空再写10 {11   //printf("handler udp packet\n");12   printf("Receive udp packet: %s\n",pkt);13 }14 15 void 16 udpSend(void) 17 { 18   uchar *pkt;19   pkt = (uchar *)NetTxPacket;20   pkt += NetSetEther(pkt, UdpServerEther, PROT_IP);21   NetSetIP (pkt, UdpServerIP, UdpServerPort, UdpOurPort, data_len);22   pkt += IP_HDR_SIZE;23   memcpy(pkt, pkt_data, data_len);24   (void) eth_send(NetTxPacket, (pkt - NetTxPacket) + data_len);25 }26 27 void28 UdpStart(const uchar *remoteeth, char *remoteip, int remoteport,int thisport, const char *data, int datalength)29 {30   UdpServerEther = remoteeth;31   UdpServerIP = string_to_ip(remoteip);32   UdpServerPort = remoteport;33   UdpOurPort = thisport;34   pkt_data = data;35   data_len = datalength;36 37   udpSend();38   printf("Send,ready to receive...\n");39 }

udp.h

 1 #ifndef __UDP_H__ 2 #define __UDP_H__ 3  4 static uchar *UdpServerEther; 5 static IPaddr_t UdpServerIP; 6 static int UdpServerPort;/* The UDP port at their end 7 */ 8 static int UdpOurPort;/* The UDP port at our end 9 */10 static uchar *pkt_data;11 static int data_len;12 13 void UdpHandler(uchar *pkt, unsigned dest, unsigned src, unsigned len);14 15 #endif

5. 修改net目录的net.c,在最下面加入NetLoop_UDP函数,并添加udp.h头文件引用 #include "udp.h"

 1 int 2 NetLoop_UDP(const uchar* remorteth, char* remoteip, int remoteport, int thisport, const char* data, int datalength) 3 { 4   bd_t *bd = gd->bd; 5  6   /* XXX problem with bss workaround */ 7   NetTxPacket = NULL; 8  9   if (!NetTxPacket){10     int i;11     /*12     * Setup packet buffers, aligned correctly.13     */14     NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);15     NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;16     for (i = 0; i < PKTBUFSRX; i++) {17       NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;18     }19   } 20 21   eth_halt();22   if (eth_init(bd) < 0) {23     eth_halt();24     return(-1);25   }26 27   restart:28   eth_getenv_enetaddr("ethaddr", NetOurEther);29   /*30   * Start the ball rolling with the given start function. From31   * here on, this code is a state machine driven by received32   * packets and timer events.33   */34   NetInitLoop(TFTP);35 36   switch (net_check_prereq (TFTP)) {37     case 1:38     /* network not configured */39     eth_halt();40     return (-1);41 42     case 0:43     NetSetHandler(UdpHandler);44     UdpStart(remorteth,remoteip, remoteport, thisport, data, datalength);45     break;46   }47 48   /*49   * Main packet reception loop. Loop receiving packets until50   * someone sets `NetState' to a state that terminates.51   */52   for (;;) {53     /*54     * Check the ethernet for a new packet. The ethernet55     * receive routine will process it.56     */57     eth_rx();58     NetSetHandler(UdpHandler);59 60     /*61     * Abort if ctrl-c was pressed.62     */63     if (ctrlc()) {64       eth_halt();65       puts ("\nAbort by Ctrl+C\n");66       return (-1);67     }68   }69 }

6. 修改net目录下的makefile,添加

COBJS-$(CONFIG_CMD_NET) += udp.o

7. 这样操作后可以通过udp_b命令发送和接收UDP广播了。实际跑在板子上能发送UDP广播,但接收不到UDP广播包。

经过查看芯片规格书之后,发现有寄存器可以屏蔽广播包,我们查看uboot网络驱动源码之后发现确实默认将UDP广播包屏蔽了。

那么我们修改\drivers\net\hisfv300下的glb.c

将hieth_writel_bits(ld, 0, GLB_MACTCTRL, BITS_BROAD2CPU_UP);修改为hieth_writel_bits(ld, 1, GLB_MACTCTRL, BITS_BROAD2CPU_UP);

8. 修改部分到此结束,现在我们进行测试。我采用的测试工具是我自己用c#写的udp收发小工具,源码就不发了,很简单的小工具。

 

参考链接:

http://blog.csdn.net/skdkjzz/article/details/39931915

https://segmentfault.com/a/1190000005273491

http://www.ithao123.cn/content-10639610.html