HSEM HAL strange behavior

[gasda.1]

Hi,

I'm playing around HSEM module and i noticed strange behavior. Why calling:

HAL_HSEM_FastTake(HSEM_ID_0);

or

HAL_HSEM_Take(HSEM_ID_0, 0);

lock all semaphores at once instead of just locking single semaphore specified by a macro using 0 as processid?

Then calling release will unlock only the one specified macro and we end up with 31 semaphores locked unintentionally.

[TDK]

Why do you think it's locking all 32 semaphores?

[gasda.1]

Because i've check it with debugger

This is state before calling HAL_HSEM_FastTake:

and this is after:

As you can see all semaphores has been locked by main cpu

[TDK · Accepted solution]

Reading the RLR (read lock register), which you are doing by examining the value in peripheral mode, will lock the semaphore. Disable the RLR registers from being viewed.

[gasda.1]

Oh you are defenitely right, viewing in peripheral mode does lock every semaphore. Thanks for clarification!