Add an ITM putchar implementation

embeddedartistry / libc

libc targeted for embedded systems usage. Reduced set of functionality (due to embedded nature). Chosen for portability and quick bringup.

MIT License

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Add an ITM putchar implementation #89

Closed phillipjohnston closed 5 years ago

phillipjohnston commented 5 years ago

Inspiration:

Screen Shot 2019-04-03 at 12 13 37

salkinium commented 5 years ago

See also https://blog.japaric.io/itm/ for more implementation details (in Rust, but applies to any language).

phillipjohnston commented 5 years ago

Thanks!

phillipjohnston commented 5 years ago

Closing after @salkinium's feedback:

It's pretty disappointing tbh. No DMA, no interrupts, no stand-alone functionality, the SWO pin isn't even connected on all Nucleo/Discovery boards, annoying to use via OpenOCD/GDB. Meh.

We'll do this if someone really wants it.