Kinetis Microcontrollers中的主题 Retarget ITM printing with Newlib

Retarget ITM printing with Newlib

jeff_hane — Tue, 30 Apr 2019 04:26:03 GMT

I want to use the ARM CMSIS DSP library on the k28 board I am using. I've got everything building and running but there is something strange happening with printf. I enable SWO on the board and compile in retarget_itm.c. However, I only ever get the first printf on the SWO ITM console. If I place a breakpoint in _write, it will enter it once but never again. The program continues to run just fine but no output on the console. I't like the link to _write got lost so calls to printf never show up again.

thanks,

jeff

Re: Retarget ITM printing with Newlib

jingpan — Tue, 07 May 2019 05:57:51 GMT

Hi Jeff,

What IDE do you use?

Regards,

Jing

Re: Retarget ITM printing with Newlib

jeff_hane — Tue, 07 May 2019 18:02:24 GMT

Hi Jing,

I use mcuxpresso; however I went back and figured this out last week. There was a buffer overrun in my code that was somehow breaking my second printf. The code would run fine and get the correct results but just that one printf wouldn't work.

thanks,

jeff