All hardware serial and USB Serial CDC hang up in Arduino 1.8.10 about arduino_stm32

[stevstrong]

I am investigating the issue.

[xtream123]

Thank you.

[stevstrong]

I just tried Serial and Serial 1, I switched back to Arduino 1.8.9. but the issue remained.
So it seems that it is something core related and not Arduino (board or platform settings) related.

What I have observed is:

• the first bytes is transferred to the TDR register, but no TXE flag is set at the end
• the voltage level on the Tx pin is 1V, this is really strange

[xtream123]

I just also want to add that in the official core (from ST) only up to Serial3 is working when I tested on it but in your core all serial is working(as I have mentioned in the forum).
I will test now in 1.8.9 using Serial and Serial1 only to see if its also happening on me.

For your observation:

1. I don't have any idea on this since I do not go very deep in the registers.
2. When does it happen?while the mcu hang? I will check on this voltage level.

[xtream123]

I tried serial and serial1 in 1.8.9 and it worked for me.

the voltage level on TX pin (PA9 is 3.27V)

[stevstrong]

Can you please share your working BIN file? I may have a faulty board.

[xtream123]

ok I will upload it.

[xtream123]

allSerialTest.ino.txt

Serial and Serial1 is working on that file.
Note change the file extension to ".bin"

[stevstrong]

I just pushed the commit ecd8e7d which should resolve the issue, please check out the whole repo again.

[xtream123]

Thanks. I will take a look at it later and send some feedback on you.

[xtream123]

hi @stevstrong , I tested your core and it worked(Serial1 to Serial6 and USB Serial at the same time) with 1.8.9 and 1.8.10 perfectly. Thank you very much.