ARM cortex: mutex using bit banding

Posted by Jeff V on Stack Overflow See other posts from Stack Overflow or by Jeff V
Published on 2010-05-18T13:01:55Z Indexed on 2010/05/21 15:20 UTC
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Filed under:

arm

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cortex-m3

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mutex

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embedded

Given that, on the ARM Cortex M3, I can:

atomically read a single bit atomically set a single bit atomically clear a single bit

How can I combine these for a mutex style set of operations:

try lock take lock release lock

It seems that try_lock or take_lock would require two operations that would not be atomic.

Do I need more control to accomplish this? Disable global interrupts would do it but it seems there should be a more surgical approach.

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