kity hong wrote:
> Hi, everyone,
>
> here is the configuration of my system:
> Linux version 2.4.22-uc0-fs2-rthal5 (un...@linux)
> Processor: ARM/VLSI ARM 7 TDMI revision 0
> RT memory manager v1.3 Loaded
> RTDM Version 0.5.1
> RTnet 0.7.0 - built on Jan 3 2006 01:20:51
> rtai : 3.6
>
Ugh, that's all very old stuff. Hope you know what you are running...
> the flash disk is 4MB, the ram size 16MB.
> we download the firmware using RTNET, the firmware size is 1KB.
> during the testing,the firmware is downloaded and unzip and run again and
> again.
RTnet for non-critical firmware download? Is the network occupied with
RT traffic at that time, or why this complication?
>
> After about 20 times or more downloading, the RTNET seem can't work
> correctly：the request data from the server gotten in RTNET API was not
> updated and delayed to update when next request was coming.
>
> here is the snapshot of source code:
> void cb_recv (struct rtdm_dev_context *context, void *arg)
> {
> struct msghdr msg;
> struct iovec iov;
> int ret;
> //struct sockaddr_in his_sin;
>
> iov.iov_base = (void *)buffer;
> iov.iov_len = sizeof(buffer);
>
> msg.msg_name = &dest_addr;
> msg.msg_namelen = sizeof(struct sockaddr_in);
> msg.msg_iov = &iov;
> msg.msg_iovlen = 1;
> msg.msg_control=NULL;
> msg.msg_controllen=0;
>
>
> /* This demonstrates the fast path to the RTnet API for kernel modules.
> Note that this method depends on using the correct RTDM version. An
> alternative is to take the file descriptor from a global variable or
> pass it in the callback argument "arg" and then call the official API
> functions. */
> ret = context->ops->recvmsg_rt(context, 0, &msg, 0);
>
> if ((ret > 0) && (msg.msg_namelen == sizeof(struct sockaddr_in))) {
>
> parse_bus_msg ((sbm_t*)buffer, ret);
>
> }
>
> }
>
> the buffer is not updated correctly when error happens.
>
> what is wrong with RTNET? Have you got an idea ?
Start with properly evaluating 'ret' when it's < 0. Beyond that, it's
hard to provide any guesses based on the available information.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
------------------------------------------------------------------------------
Download Intel® Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev
_______________________________________________
RTnet-users mailing list
RTnet-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/rtnet-users
