UART redirection with C++ on the FRDM-K64F

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UART redirection with C++ on the FRDM-K64F

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kylehamilton
Contributor I

In trying to create a test project in C++ for the FRDM-K64F with MCUXpresso, I found that UART redirection of printf and std::count calls was not working.  After some investigation, I found that fsl_debug_console.c does not define the necessary redirection functions for Newlib (_write and _read, see Using printf()) in C++ projects.  For Redlib in C projects, the equivalent functions (__sys_write, __sys_readc) are correctly defined but for some reason the Newlib functions are missing.

The attached fsl_debug_console.c adds the missing functions and successfully redirects to/from the UART with printf, scanf, std::cout, and std::cin.

Here are the versions that I am using:

- MCUXpresso IDE v10.0.2 [Build 411] [2017-07-11] 

- MXUXpresso SDK 2.2.0

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edw8
Contributor III

Ran into the same issue described above for std::cout redirection.

Modified for MCUXpresso v10.1.0 (build 606) and SDK 2.3.0 (below) and std::cout displays to UART.

Note: A separate CR (\r) is necessary in addition to std::endl.

2018-04-18_12-26-55.png

MCUXpresso SDK team, would you be able to promote this change into the SDK sources for future projects?

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