µTasker Forum
µTasker Forum => ATMELTM AT91SAM7X and AVR32 => Topic started by: timadria on January 20, 2020, 04:03:46 PM
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I've just upgraded to Crossworks v4 and after uploading the utasker to the SAM7S processor this will halt on the __irq_en macro.
When executing mrs r12, CPSR
the CPU halts and loops on b . /* endless loop */
Any idee how this can be solved?
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Hi
Since the involved code is assembler code I wouldn't expect a compiler version to be able to have any effect on that code.
The endless loop is a default exception vector, which probably means that the access caused an interrupt (maybe a fault interrupt?) to be triggered.
The instruction mrs is described here:
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/CIHGJHHH.html
but I don't see any restrictions that could cause its use to fail.
Check that the code is located on a 32 bit boundary in memory - it is preceded by
.code 32
but maybe the newer version ignores this?
Regards
Mark