UART HW flow control bugs

[abhipray]

I have an nrf52832 connected to a UART-USB driver with RTS/CTS. CLI manages the UART connection. Using SDK 14.0.

When HWFC is enabled, if a serial connection is NOT established immediately, the scheduler library overflows with tasks causing the device to reset.

No such overflow is observed when the serial connection is established immediately. Or when HWFC is disabled.

Is there any configuration that needs to take place for RTS/CTS pins? It seems as if the UART module is going into blocking mode perhaps when HWFC is enabled and USB serial connection disabled?

[Krzysztof Chruscinski]

Hi,

it maybe related to the fact how Segger chip determines if HWFC should be used.

[abhipray]

I am not using an eval kit. Would this same problem show up if I use an external Segger j-link probe for programming?

[Sigurd]

Hi,

• Do you have this issue when using the nrf52832-DK ?
• Since this is not a eval kit/ DK, what kind "UART-USB bridge" are you using ?
• Could you upload some example code / project, so that we can reproduce the issue here ?

[abhipray]

I have not tested this on the DK. The UART-USB bridge is an SI Labs CP-2102. I can try to upload some example code that reproduces the problem.

[abhipray]

Any updates on this? We're still seeing this issue.