topic Re: Console printing in MCUXpresso IDE

Console printing

muis — Thu, 20 Jul 2017 13:44:48 GMT

Using LPCExpresso I was able to use this code to print directly to the console:

#define LIBSTUB_SYS_WRITE __write

But using MCUExpresso it cannot compile because __write seems undefined?

Normally this is caused when you disable semihosting, but its enabled now, so how to upgrade my code?

Re: Console printing

lpcxpresso_supp — Thu, 20 Jul 2017 19:09:25 GMT

You need to use the symbol __sys_write (as described in section 11.5.6, "Retargeting printf/scanf", of the MCUXpresso IDE v10.0.2 User Guide).

IIRC __write was renamed to __sys_write back in the days of Red Suite 3 or 4 when the whole semihosting layer was reworked. It is possible the symbol was still there as an alias in later LPCXpresso IDE versions until some more recent tidy up work.

Regards,

MCUXpresso IDE Support

Re: Console printing

muis — Thu, 20 Jul 2017 20:16:43 GMT

The alias was still present in the latest release of LPCXpresso (v8.2.2), but I changed it to __sys_* and it compiles again, so thanks for your help.