MQX Software SolutionsのトピックRe: MQX did not start when printf in CPP constructor

MQX did not start when printf in CPP constructor

danny30 — Fri, 20 Oct 2017 17:36:26 GMT

Hello, in MQX 4.2 "C plus plus example", when I inserted printf functions in class object constructor, the code compiled fine but MQX task did not start and TAD information showed invalid. Is there any reason for this behavior ?

Thanks !

Re: MQX did not start when printf in CPP constructor

danielchen — Wed, 25 Oct 2017 08:06:04 GMT

Hi Adrian Mango

Existing MQX/C++ support depends on third-part toolchain startup routines. All of the supported toolchains invoke static object constructors before the main function -- which starts the MQX. The _io_printf calls for MQX device access.

Have a great day,
Daniel