SDK • Re: Need help with SDK and newlib.

Is it good form to have printf call itself? Normally there is an independent subsystem which handles this. This subsystem is verified manually.

but why do I need to do this ?

Note C has a few translation layers. One of them is a IO/File system layer on top of the operators layers.

The SDK uses a custom printf which bypasses the IO/File stream layer. Technically the printf implementation is capable of being compliant.

• The stdio implementation is used, which uses a construct called stdio_driver_t. So the SDK goes directly to their operators layer.
• Printf's primary egress is putchar which is mapped to stdio_putchar_raw. (https://github.com/search?q=repo%3Arasp ... &type=code)

I'm trying to fill in the stub functions in newlib and the SDK so that I can define custom I/O streams.

In summary hooking the C operator subsystem will not work. Want to file a bug for this?

Statistics: Posted by dthacher — Tue Dec 10, 2024 3:08 pm

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