What C library functions are supported

[brianreinhold]

Is there some documentation listing what C library functions are supported? For example if I use the Keil IDE to look for FILE I find it. But if I look for 'fread' it says it is undefined. strcpy exists. So does memset. How can we find what exists and what does not? Some of the ones that would be questionable are the time-related functions, file creates, reads, and writes, and anything to do with semaphores.

[awneil]

This is provided by the toolchain that you use - not by Nordic.

So, for Keil, you need to see the Keil documentation: www.keil.com/.../man_arm.htm

[brianreinhold]

I would have thought it would be chip-dependent.

[awneil]

Not the Standard 'C' library stuff - because it's Standard.

[brianreinhold]

That means we can use FILE and fwrite/fread instead of flash writes and reads?

[awneil]

No it means you need to check the toolchain documentation to see what the toolchain provides

Things like FILE are often omitted by embedded toolchains (or require specific setup to enable them).

EDIT

For Keil, you'll see that they have a couple of options for runtime libraries ...

[brianreinhold]

Okay. That's what I thought. Just because its part of the standard library does not mean its available.