|Subject:||Re: [lwip-users] TCP Retransmission when receiving consecutive packets|
|Date:||Thu, 20 Mar 2014 19:46:53 +0100|
|User-agent:||Mozilla/5.0 (Windows NT 6.2; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0|
Alright, I also use the ST drivers (the ones from STM32Cube 1.0.0)
on an STM32F4|
I haven't verified that my fix is 100% accurate but I think it looks safe so I'm sending it to ST anyway so they can figure it out if they want to.
My fix goes something like this:
At the bottom of HAL_ETH_GetReceivedFrame_IT() I return an error code if I don't find a complete packet:
And then return NULL from low_level_input() in my ethernetif:
And in my receive task I have this loop (ok yeah this could be prettier...)
Hope it helps!
On 2014-03-20 19:13, Sergio R. Caprile wrote:
Yes Jens, looks like you are absolutely right, missed that, there is no frame loss here, the receiving process must be getting only the first frame in the "chip" cue. Julien is using some ST microcontroller, I guess it has a built-in eth controller, probably with DMA. I've studied the Linux drivers for the DM9000 to write my driver, and I've seen they read all the packets out of the chip every time; then I setup a simple test to see if interrupts would trigger on every frame or only on empty buffer, and guess what... empty buffer only (there is no int ack here) Looks like we've got a different situation here, the chip seems to be issuing an interrupt after the first one is ACKed, as you Jens described for your case. Julien, can you confirm this from the chip docs ? Pitty one has to fix the drivers for a manufacturer, maybe someone in ST can lend a hand ?
|[Prev in Thread]||Current Thread||[Next in Thread]|