Kinetis Microcontrollers中的主题 Re: Forcing a Thumb address

Forcing a Thumb address

ERussell — Thu, 26 Jul 2012 04:26:39 GMT

I am working with a k60 using CW10.2. I would like to force a label in an assembly file to be at a thumb address, i.e. with the LSB set, but have not been able to do this. Can anyone tell me how to do this?

Thanks.

Re: Forcing a Thumb address

Nouchi — Thu, 26 Jul 2012 13:23:00 GMT

Hi,

Cortex M processors only support thumb and thumb-2 instructions.

http://www.arm.com/products/processors/cortex-m/cortex-m4-processor.php

Re: Forcing a Thumb address

konrada — Mon, 30 Jul 2012 19:42:23 GMT

Whether you need to add one to your code address depends on what instruction you use to jump there (B/BL vs BX/BLX), so adding the one to the label is dangerous.

What are you trying to do?

Re: Forcing a Thumb address

ERussell — Wed, 08 Aug 2012 03:04:28 GMT

I was attempting to implement the QK Scheduler portion of the Quantum Leaps QP code. There is a warning, at least for the GNU C compiler, to insure that the address of an assembly label is a thumb address in the PendSV_Handler routine. As it turned out there was no problem and the function is working correctly with no intervention on my part, so I assummed that the fist responder was correct.

Thanks for responding.