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This packs the stdio implementation from [1] as alternative to what the used standard C lib provides with the intent to provide a thread-safe, smaller, and more feature-complete alternative on newlib targets. Compared to `newlib_nano` this reduces `.text` by a bit more than 200 B while adding support for standard format specifiers such as `RPIu8`, `PRIu16`, `PRIu64`, `%z`, and `%t`. Note that `newlib_nano`'s stdio can be thread-safe in reentrant mode at the cost of RAM (per thread) and latency. Especially the increase in latency can be prohibitive when real time requirements need to be met. [1]: https://github.com/mpaland/printf
28 lines
919 B
Markdown
28 lines
919 B
Markdown
@defgroup pkg_mpaland-printf mpaland's printf
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@ingroup pkg
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@brief mpaland's printf implementation is a lean, thread-safe and
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feature-complete printf implementation
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# License
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Licensed under the MIT license.
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# Usage
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Add `USEPKG += mpaland-printf` to the application's `Makefile` or compile
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using `USEPKG=mpaland-printf make BOARD=<BOARD> -C <APP_DIR>`.
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# Features
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The package implements all standard format specifiers. However, support
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for floating point is disabled by default due to the immense ROM overhead
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on MCUs without FPU.
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@note Support for floating point formatting can be enabled
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via the `printf_float` module, i.e., by adding
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`USEMODULE += printf_float` to the application's `Makefile`.
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@note Support for non-standard format specifiers such as needed for
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printing from flash on AVR MCUs are not implemented.
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@see https://github.com/mpaland/printf
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