Nasty UART Bug?

Archive
1

Working on the tablet I added on the old Adafruit GPS I’ve used before with Cerb40. I put it on the protoboard and connected to Socket 5 as a gadgeteer module, then found touches stopped working after about a minute. I was gettting Buffer Overruns. Well this shouldn’t be, so I tried a bunch of different changes including making it non-gadgeteer and opening COM1 instead. Still killed me.

It’s worth noting I also have the Bluetooth module on Socket 7.

After taking off the Bluetooth module, it still seemed to overflow, so for fun I switched the GPS to Socket 7 (COM2, non-gadgeteer), everything seems to be working fine now. I’ll add the Bluetooth module back in and see where it goes.

Any known issues on Socket 5?

2

At what rate does you’r gps send data?

3

Only 1x per second 9600 baud and this is the exact same parsing code I used on the Cerb40.

It’s been running trouble free on the new socket since my post. Going to keep it running and check touches occasionally.

4

Very strange. Can you give us some steps to try to repro?

5

Well unless you’re going to connect a custom module, it might be a bit difficult.

I still have no failures or overruns on this Socket.

Bluetooth is connected to 5 (my problem socket) but it doesn’t exactly send much data at the moment so it would probably take a very long time to overflow the buffer.

6

We will try to test some more but not sure if we can reproduce easily.

7

you could just replay some GPS data from a PC connected to the COM port…

8

We are unable to repro. Please mark answer if complete.