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makefiles/stdio: enable stdout buffering for CDC ACM, ethos, semihosting

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CDC ACM, ethos, Semihosting and SLIP all benefit from sending data out
in larger chunks and will benefit from stdout buffering.

`stdio_rtt` does have an internal TX buffer, so we don't need to do any
buffering on top.

With plain UART there was a slight advantage *without* buffering when
testing with `tests/periph_uart_nonblocking` (with the non-blocking feature
disabled).

Since the removal of the buffering saves us some RAM and ROM, disable it by
default there.

This will be different with DMA enabled UARTs.
This commit is contained in:
Benjamin Valentin 2020-09-01 12:04:26 +02:00
parent ea27064d21
commit c94860d8fc
1 changed files with 7 additions and 0 deletions
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7
makefiles/stdio.inc.mk
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@ -55,3 +55,10 @@ ifneq (,$(filter stdio_semihosting,$(USEMODULE)))
USEMODULE += xtimer
FEATURES_REQUIRED += cpu_core_cortexm
endif
# enable stdout buffering for modules that benefit from sending out buffers in larger chunks
ifneq (,$(filter picolibc,$(USEMODULE)))
ifneq (,$(filter stdio_cdc_acm stdio_ethos slipdev_stdio stdio_semihosting,$(USEMODULE)))
USEMODULE += picolibc_stdout_buffered
endif
endif