Changing the baudrate to 115200 (default for REPL) captures incorrect characters

[microbit-carlos]

The default serial connection between MicroPython and DAPLink should be 115200, setting this baud rate in the REPL via uart.ini()causes odd characters to be captured/sent-back. GIF below.

[microbit-carlos]

CODAL has been updated with some serial fixes, so I've updated the CODAL version here in a branch, and while some of the other problems are fixed, this one is still not resolved.

https://github.com/microbit-foundation/micropython-microbit-v2/actions/runs/430344171

Of course, there is a lot more going on in MicroPython, but just as a data point, I cannot replicate this problem with this simple code example:

#include "MicroBit.h"

MicroBit uBit;

int  main() {
    uBit.init();
    uBit.serial.setBaud(115200);
    while (1) {
        char x = uBit.serial.read();
        uBit.serial.sendChar(x);
    }
}

[dpgeorge]

I've updated the CODAL version here in a branch

Thanks, I've now merged that (it fixes the "serial garbage on start" up issue).

this one is still not resolved.

Yes, confirmed this issue here is not fixed. I did manage to reproduce it using pure C++ by adding a call to redirect (which is what MicroPython does):

#include "MicroBit.h"

MicroBit uBit;

int  main() {
    uBit.init();

    for (int i = 0; i < 10; ++i) {
        char x = uBit.serial.read();
        uBit.serial.sendChar(x);
    }

    uBit.serial.setBaud(115200);
    uBit.serial.redirect(uBit.io.usbTx, uBit.io.usbRx);

    while (1) {
        char x = uBit.serial.read();
        uBit.serial.sendChar(x);
    }
}

In the above test, the first 10 chars are echoed back correctly, but then when it redirects (to the same pins) following chars are not.

[microbit-carlos]

Thanks Damien, I've open https://github.com/lancaster-university/codal-microbit-v2/issues/60 in the CODAL repo.

[dpgeorge]

Looks like there has been no progress yet in the CODAL on this issue.

[microbit-carlos]

Issue has been fixed as part of https://github.com/lancaster-university/codal-microbit-v2/issues/60 and will available in the next CODAL tag (coming soon).

In the meantime this hex can be used for testing: microbit-micropython-uart-test-build.hex.zip

[dpgeorge]

CODAL was updated to v0.2.25 in 76054c2e9445d8eea285132c2374a18ddc690514 so hopefully this issue is fixed now.

[microbit-carlos]

Can confirm this is fixed and will be present in the beta.5 release, thanks Damien!