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- menu "Newlib"
- choice NEWLIB_STDOUT_LINE_ENDING
- prompt "Line ending for UART output"
- default NEWLIB_STDOUT_LINE_ENDING_CRLF
- help
- This option allows configuring the desired line endings sent to UART
- when a newline ('\n', LF) appears on stdout.
- Three options are possible:
- CRLF: whenever LF is encountered, prepend it with CR
- LF: no modification is applied, stdout is sent as is
- CR: each occurence of LF is replaced with CR
- This option doesn't affect behavior of the UART driver (drivers/uart.h).
- config NEWLIB_STDOUT_LINE_ENDING_CRLF
- bool "CRLF"
- config NEWLIB_STDOUT_LINE_ENDING_LF
- bool "LF"
- config NEWLIB_STDOUT_LINE_ENDING_CR
- bool "CR"
- endchoice
- choice NEWLIB_STDIN_LINE_ENDING
- prompt "Line ending for UART input"
- default NEWLIB_STDIN_LINE_ENDING_CR
- help
- This option allows configuring which input sequence on UART produces
- a newline ('\n', LF) on stdin.
- Three options are possible:
- CRLF: CRLF is converted to LF
- LF: no modification is applied, input is sent to stdin as is
- CR: each occurence of CR is replaced with LF
- This option doesn't affect behavior of the UART driver (drivers/uart.h).
- config NEWLIB_STDIN_LINE_ENDING_CRLF
- bool "CRLF"
- config NEWLIB_STDIN_LINE_ENDING_LF
- bool "LF"
- config NEWLIB_STDIN_LINE_ENDING_CR
- bool "CR"
- endchoice
- config NEWLIB_NANO_FORMAT
- bool "Enable 'nano' formatting options for printf/scanf family"
- default n
- help
- ESP32 ROM contains parts of newlib C library, including printf/scanf family
- of functions. These functions have been compiled with so-called "nano"
- formatting option. This option doesn't support 64-bit integer formats and C99
- features, such as positional arguments.
- For more details about "nano" formatting option, please see newlib readme file,
- search for '--enable-newlib-nano-formatted-io':
- https://sourceware.org/newlib/README
- If this option is enabled, build system will use functions available in
- ROM, reducing the application binary size. Functions available in ROM run
- faster than functions which run from flash. Functions available in ROM can
- also run when flash instruction cache is disabled.
- If you need 64-bit integer formatting support or C99 features, keep this
- option disabled.
- endmenu # Newlib
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