Stellaris® ARM® Microcontrollers

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TFTP
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  • Forum Post: Re: Example about TFTP-client

    Andy Neil
    yanping zhong I'm new in this forum Welcome to the forum. Do you have any prior programming experience in general? Do you have any prior programming experience with embedded microcontrollers in particular? Do you have any prior experience with Internet protocols? yanping zhong I'm...
    on Aug 22, 2011

  • Forum Post: TFTP using LWIP

    Mohsin
    Hi, I am using LWIP and have got the TFTP working. The only issue I have is that since the LWIP uses callback from interrupts, it blocks other code from execution until the transfer is complete. I was thinking of delaying the reply (i.e. to reply after 10 ms) so that other code can also be...
    on Nov 10, 2011

  • Forum Post: Re: TFTP server causes UDP to stop working after a connection break?

    Stefano Bettega
    Hi Sean, I think UDP is correctly working, as Finder is locating all of our boards. The problem arise when a TFTP connection is closed by the client. I'm using TFTPD32 (64 bit version, you can find it here ). When I start a PUT request and then, after some packets, click on the break button, the...
    on Apr 3, 2012

  • Forum Post: Re: TFTP server causes UDP to stop working after a connection break?

    Stefano Bettega
    Ok, after a little bit of investigation I found the problem being into UDP socket handling. Actually lwIP is configured with an UDP pcb pool size of 4 elements. Two pcb are in use: one for device discovery protocol (Finder), on UDP/23 one for TFTP connection, on UDP/69 When a TFTP connection...
    on Apr 3, 2012

  • Forum Post: Re: TFTP server causes UDP to stop working after a connection break?

    Stefano Bettega
    Ok, found the problem about the NULL pcb pointer. Actually I'm using tftp.c from Stellarisware revision 8555 . You can easily find that on lines #613 and #696 there is no error checking for udp_new() function return. Line #613 is causing the overwriting problem: return code should be checked...
    on Apr 3, 2012

  • Forum Post: Re: TFTP server causes UDP to stop working after a connection break?

    Stefano Bettega
    Thanks Sean. In the meanwhile I modified tftp.c source code (see attached files). Basically I added two test on udp_new() result value: these test avoid overwriting UDP pcb list. About the timeout to be used for closing pending opened connection, I decided to work on a per-connection base. Assuming...
    on Apr 3, 2012

  • Forum Post: TFTP server causes UDP to stop working after a connection break?

    Stefano Bettega
    Hi, I'm transferring a file by TFTP from PC to our board, using a LM3S9B96. It works fine, except when I break the connection in the middle of a transfer (i.e. forcibly closing application on PC). After this event, no more UDP connection can be made to the board (i.e. also the Finder application...
    on Apr 2, 2012

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