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Tim 'mithro' Ansell 2026-01-19 3:29 a.m.

@Xobs - FYI

2

MicroPython v1.10-308-g421dcd2 on 2020-01-03; fomu with vexriscv

3:21 p.m.

this is from fomu-workshop tar or something I have from years ago

3:23 p.m.

if I am runing some py code, and then ^c, it stops but I don't get KeyboardInterrupt like I do on uP on Pico

3:24 p.m.

really I want to know where uP print('foo') data is buffered

3:24 p.m.

this code consumes it: https://github.com/CarlFK/dolly/blob/main/logr/consume1.py

dolly/logr/consume1.py at main · CarlFK/dolly

dal - data aquision loger . Contribute to CarlFK/dolly development by creating an account on GitHub.

3:25 p.m.

but s.reset_input_buffer() doesn't seem to do much as the next while loop spits out a bunch of lines

3:26 p.m.

if I put a sleep(.5), then s.reset_input_buffer() seems to work.

3:27 p.m.

so I'm guessing I need to wait for the print() data to get into the buffer that cP can reset_, but I'm wonderin where it is pooling up

If you can find the source for the build, you'll probably want to look in ports/<whatever it's called>/uart_core.c (edited)

3:31 p.m.

Ctrl-C handling is port specific, as it requires the uart driver to be able to flag a Ctrl-C character has been seen before uP has processed the buffer

#tomu channel on irc.freenode.net https://workshop.fomu.im/en/latest/help.html

4:26 p.m.

I can't find the uP fomu port

4:27 p.m.

yes I can. https://github.com/im-tomu/micropython/tree/fomu/ports/fomu

micropython/ports/fomu at fomu · im-tomu/micropython

The Micro Python project. Contribute to im-tomu/micropython development by creating an account on GitHub.

// Send string of given length void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) { https://github.com/im-tomu/micropython/blob/fomu/ports/fomu/src/uart-core.c

micropython/ports/fomu/src/uart-core.c at fomu · im-tomu/micropython

The Micro Python project. Contribute to im-tomu/micropython development by creating an account on GitHub.

4:50 p.m.

is this how uP print() gets sent up the usb serial ?

4:50 p.m.

I'm still curious where stuff is buffered

Yes, that's how the output gets to the serial, I don't think there's any other buffering. That function just loops until it's managed to give all the characters to usb_write, and it is called directly from mp_print_* functions (via the MP_PLAT_PRINT_STRN macro).

Somewhere is a 256 byte buffer, and then I think a 2nd larger one. which may be on the Linux/host and then cPython

6:39 p.m.

cPython/linux I open the connection, serial.in_waiting shows 0, sleep .1' in_waiting is either 256 or 294 (256 + len(one line of data)

@carlfk - It would be awesome to update micropython on the Fomu....

9:12 p.m.

@jimmo might be able to help with that....

9:12 p.m.

@carlfk - I also found a couple more of the EVT Pi hat boards. I'd love to get them onto https://fpgas.online and convince people to play with them...

Tim 'mithro' Ansell

@carlfk - I also found a couple more of the EVT Pi hat boards. I'd love to get them onto https://fpgas.online and convince people to play with them...

what is a EVT Pi hat board ?

That blue RPi Hat board which has the same hardware in an easier to look at form factor

ah - fomu

carlfk

Somewhere is a 256 byte buffer, and then I think a 2nd larger one. which may be on the Linux/host and then cPython

it looks like fomu does some buffering on the usb endpoint too? (i.e. in usb_write - as far as i can tell multiple calls can be coalesced into one endpoint transmission, as opposed to usb_send)

@Xobs might be able to explain how the USB core works more....

9:32 p.m.

The "eptri" is a keyword there

@carlfk - maybe we should do a Fomu like this -> https://www.hackster.io/news/the-arduino-uno-now-in-extra-large-7a15236d9e8a

The Arduino UNO, Now in Extra-Large

UncleStem just built a massive, fully functional Arduino UNO that is scaled up seven times its original size.

2

The canonical documentation for eptri is what's generated by lxsocdoc: https://rm.fomu.im/usb.html

Tim 'mithro' Ansell

@carlfk - maybe we should do a Fomu like this -> https://www.hackster.io/news/the-arduino-uno-now-in-extra-large-7a15236d9e8a

There’s also https://shop.pimoroni.com/products/pico-jumbo?variant=42095185821779

Pico Jumbo (Pico 2 Aboard)

A hilariously oversized but fully functional Raspberry Pi Pico 2 for demos, japes and shenanigans.

RebelMike

There’s also https://shop.pimoroni.com/products/pico-jumbo?variant=42095185821779

Makes me also think of https://monster6502.com/