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The result is not bad although something still let me maze. that is in c/c++builder of properties of myproject and myproject_syslib. (3) change the compile option, configuration, from Debug to Release. i doubt if the lwip calculates checksum for each element of data. The algorithm to compute the checksum is the Standard Internet Checksum algorithm.
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(2) next step, use your udp.c routine, the time reaches 15.4 sec. this makes the time drop from 40.5 to 20.2 seconds. buf =) to outside while(1) loop as above routine shows. Now in my system the time spending on collecting 100 frame pictures has decreased from 40.5 to 7 sec via following steps. Netbuf_ref(buf, (unsigned char*)udp_packet_addr, UDP_PAYLOAD_BYTES) Udp_packet_addr = (unsigned short*)(dma_data_base + udp_addr_offset-2) Udp_addr_offset = UDP_EACH_DATA * num_udp_completed * set the base and offset address of UDP packet */ Netconn_connect(conn, &addr, HostUDPPortNum) įor(j=0 j<4 j++) // send 2k pixels each time * connect the connection to the remote host */ * set up the IP address of the remote host */ # define TOTAL_UDP 160 // total packets, 1K bytes a packet# define UDP_EACH_DATA 1024 // bytes,# define UDP_PAYLOAD_BYTES UDP_EACH_DATA+2 // add index number of My work is to collect image(320*256 pixels,16bit) into SDRAM and send they to a host. Hello All, Im developing a simple UDP client/server application in Python, and was attempting to use Scapy to send packets to the server for testing over. UDP transmition runs on ucos II as a task. My system is based on a IS10 DEV kit from Altera, uses Nios2/f cpu. I think I have got a key in my case and like to share with you and other friends.