UART tx stops due to flow control; requires power cycle

RE: UART tx stops due to flow control; requires power cycle

Hung Bui — Fri, 28 Jul 2017 08:49:50 GMT

Glad that you found the issue. Hope that it's solved.

RE: UART tx stops due to flow control; requires power cycle

badvassal — Wed, 26 Jul 2017 20:20:06 GMT

Thanks Hung, I think you nailed it! I was surprised to see that the debugger is involved at all since I am not using the virtual COM port. Rather, I am attaching a cable to pins 8, 9, 10, and 11. But it seems this uses the same pathway as the virtual COM port.

I have since moved to pins 24, 25, 28, and 29, and it seems to be working! My test has been running for much longer than it used to, so I am hopeful that the problem is solved.

Thanks a lot for your prompt answer. I never would have thought of this one.

RE: UART tx stops due to flow control; requires power cycle

Hung Bui — Tue, 25 Jul 2017 14:28:23 GMT

Hi Chris,

I suspect that it might have some problem with the Segger chip on the board. This chip acting as the bridge between UART on nRF51 and virtual UART on PC. Especially when you mentioned that even after you reset the nRF51 chip HWFC still doesn't work.

My suggestion is to try connecting UART on nRF51 to other FTDI chip or RS232 chip for testing