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Task Tracker - UART can lose data under heavy loads


#1

I just posted UART can lose data under heavy loads on Task Tracker. Feel free to discuss and make suggestions here.


#2

UART can lose data under heavy loads was updated.

Status went from Proposed to Open.
Priority went from Unassigned to Minor.


#3

@ John - I can state the following, maybe it helps in bug tracing:

For me, transmitting chunks of around 300 Byte every 100 ms in range from 57.600 to 460.800 bauds works reliably now with my Raptor board. Each chunk takes between 5 to 50 ms to transmit, depending on the chosen baud rate.

Don’t know if this already falls under the category “heavy loads”.

When estimating application runtime needs versus required time for data chunk processing, I considered that the underlying maximum, fixed NETMF serial buffer size is 1024 bytes. Hope that this is correct? I use the rs232.Port.DataReceived event and with every event I enqueue all bytes to read at that moment in a System.Collections.Queue. Since I am doing so, I didn’t loose any data anymore, as it was the case before without additional FIFO queueing.

Nevertheless, as long as I used socket 12, I regularly faced HAL resets w/out any exception-, overflow- or GC-message at the latest after transmitting above said chunks over period of 30 to 300 seconds.

But since I use socket 11 I never had any problems anymore, application runs permanently without any resets or data losses. Must, in this special case, have something to do with socket 12.


#4

@ Harald - The underlying serial buffers differ for each board. For the G400, I believe it is 4KB TX, 16KB RX. Thanks for the information. We will try and look into socket 12 as well.


#5

UART can lose data under heavy loads was updated.

Status went from Open to Closed.


#6

I am interested in knowing how this was fixed, and what systems it might have impacted…?


#7

Since the staus is “Rejected” I would guess it is not fixed.
Hopefully it will get fixed withe the new Network stack Approach by MS