UART Speed mismatch ???

[furang]

Hello. Thanks for your great job!
I've bought this board. looks like this should be supported. I've flashed bootloader and image. Soldered USB UART (FT232RL)
FT 232 RX <-> RP2350 TX (GPIO1)
FT 232 TX <-> RP2350 RX (GPIO0)
FT 232 GND <-> RP2350 GND
Set TTL voltage to 3.3 Volt
Open terminal
minicom -D /dev/ttyUSB0 -b 115200
And then power on the board.
And here's what I see

Looks like uart speed mismatch. I tried all possible baud rates and nothing seems to work and show corrects text chars (tried 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600).
Also I tried to watch what's on board's usb uart
minicom -D /dev/ttyACM0 -b 115200

It says to look at hardware serial only, but there's no bootlog there.
Can you please tell what I'm doing wrong? Thanks!

[Mr-Bossman]

Hello. Thanks for your great job! I've bought this board. looks like this should be supported.

Yes it seems to be an almost clone of the sparkfun board. Its also really funny they have a tutorial for my project there too.

I've flashed bootloader and image. Soldered USB UART (FT232RL)
FT 232 RX <-> RP2350 TX (GPIO1)
FT 232 TX <-> RP2350 RX (GPIO0)
FT 232 GND <-> RP2350 GND
Set TTL voltage to 3.3 Volt

This seems correct.

Open terminal
minicom -D /dev/ttyUSB0 -b 115200

I am no familiar with minicom I use screen /dev/ttyUSB0 115200 which works for me.

And then power on the board.
And here's what I see

It seems like there is transmission so it could be that the baud rate isn't being set correctly.
Since you are getting data over USB I would see if you can make your old "hello world" project that outputs over UART to debug as that's a lot simpler. To do that just add

pico_enable_stdio_usb(your-project-name 1)
pico_enable_stdio_uart(your-project-name 1)

to the CMakeLists.txt of the project.

I also have made a newer release of this project that avoids the pico sdk which may work better, but doesn't have USB support

[furang]

Sorry. Didn't get where to add this lines.

[furang]

I tried to flash built flash-image.bin (with their bootloader). And now I get this

And it runs infinetely

[Mr-Bossman]

@furang did you get it to work? I would just use this repositories release instead of their stuff if it is still not working.

[furang]

Haven't managed to make it run for now. I'm at work assignment right now. I'll try it on monday when I'm home.
There's instruction how to flash firmware. But how should I flash the bootloader? Thanks.

[furang]

Nothing has changed. built like in instruction.
flashed with this command

picotool load -fu buildroot/output/images/flash-image.uf2

When it boots here's the output on usb cable.

UPD. If I press any button it reboots. If I press y looks like it reboots too. I can't see any difference.
UPD2. Shoud I built and flash psaram bootloader. I can't find neiter psram-bootloader.bin nor psram-bootloader.uf2 in build output dir.