Teensy 4.1 support - Githubissues

tinygo-org / tinygo

Go compiler for small places. Microcontrollers, WebAssembly (WASM/WASI), and command-line tools. Based on LLVM.

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Teensy 4.1 support #1598

Open wbourne0 opened 3 years ago

wbourne0 commented 3 years ago

Is there any plans in place for supporting the teensy 4.1?

From what I can tell, it uses the same chip as the teensy 4.0, so I think a good bit of it can is done in #1425.

I'm happy to help with it, though I'm not sure what to do with most of it so I don't know if I'll be able to help much.

Thanks.

ardnew commented 3 years ago

Most of the Teensy 4.0 support can indeed be re-used for Teensy 4.1 - the entire runtime package in particular.

To add Teensy 4.1 support, a new board file src/machine/board_teensy41.go defining how pins are broken out on the PCB, target JSON targets/teensy41.json and linker script targets/mimxrt1062-teensy41.ld/targets/teesny41.s need to be added. You can probably re-use the Teensy 4.0 as template for most of this.

See the Wiki page for general concepts on what is required: https://github.com/tinygo-org/tinygo/wiki/Adding-a-new-board

wbourne0 commented 3 years ago

Oh yep, I've actually been doing a little bit of work on this. The main issue that i have is not knowing if i did things the correct way. I also can't get serial communication to work which is annoying.

wbourne0 commented 3 years ago

All i've been able to do is get it to turn a light on or off at the start, and i haven't been able to get any timing to work and as such can't tell if im able to turn a light on and off

ardnew commented 3 years ago

Oh yep, I've actually been doing a little bit of work on this. The main issue that i have is not knowing if i did things the correct way. I also can't get serial communication to work which is annoying.

@AllAwesome497 If you want to post a link to your branch I'd be happy to review

wbourne0 commented 3 years ago

@ardnew so a bit of an update: Here's what I've done:

board_teensy41.go (copied board_teensy40.go)
mimxrt1062-teensy41.ld (copied mimxrt1062-teensy40.ld just changed the memory area here to match the ld file in the cores repo for tinygo)
teensy41.s (copied teensy40.s, changed the sflashA1Size to the value that's commented out)
teensy41.json (Copied teensy40.json just updated to use the correct build flags and point to the new assembly and linkerscript files)

Problem is, I can't seem to get anything working (no uart, no gpio). The only indication that its even being flashed is that it overrides the code that I flash with arduino.

uart also isn't working over usb, no /dev/ttyACM*. I also made an arduino program with my arduino that would read from the pins directly and echo over usb which worked w/ serial in arduino code but not w/ tinygo.

wbourne0 commented 3 years ago

I've got a branch of a fork with what I've done so far if you want to take a look: https://github.com/AllAwesome497/tinygo/tree/board-teensy41.