uart problem

[crouse12]

I found that uart in microbit v2 has a problem if I follow the following steps.
(1)
Connect to microbit v2 by using putty,
(2)
Reset the microbit v2's power.
(3)
Connect to microbit v2 by using putty,
You can find that microbit v2 cannot work correctly.

https://youtu.be/ZrAsxoCKZTo

[dpgeorge]

Yes I have seen that issue before, that sometimes on initial connection the REPL is not responsive and just returns garbage characters.

@microbit-carlos I'm not sure where the issue lies, maybe with DAP link?

The workaround is to press the reset button on the back of the microbit while it's still connected to putty.

[crouse12]

Can you clear buffers or session when the Microbit v2 starts?

[crouse12]

Can anyone help me to solve uart problem?

[martinwork]

Problem exists with a C++ test too.

[dpgeorge]

Problem exists with a C++ test too.

Can you please post C++ code that reproduces it? I guess it's an issue with the CODAL and initialisation of the serial UART?

[martinwork]

@dpgeorge lancaster-university/codal-microbit-v2#45

[dpgeorge]

See also lancaster-university/codal-microbit-v2#55

[dpgeorge]

Fixed by df3caf7