Implementing a mutex

RE: Implementing a mutex

Ole Morten — Thu, 15 Aug 2013 04:53:44 GMT

Please see my separate answer, which most likely explains why this happens.

RE: Implementing a mutex

Ole Morten — Thu, 15 Aug 2013 04:53:19 GMT

To answer the original question first: I believe that the ARM Cortex M0 does not support the instructions needed to follow that guide in detail, and I would as Carles say therefore recommend you to use the softdevice API functions.

Remember that softdevice functions can only be called from interrupt with priority 3 and the main context, not from interrupts with priority 2. See this answer for more details.

Edit: You can change the priority of interrupts with the sd_nvic_SetPriority() function.

RE: Implementing a mutex

Guilherme de Paula — Wed, 14 Aug 2013 19:51:49 GMT

I've tried that but when calling "sd_mutex_acquire()" in the handler code it goes into HardFault.

RE: Implementing a mutex

Carles — Wed, 14 Aug 2013 08:01:19 GMT

Hi there,

Are you using the SoftDevice?

If so, there are already SVCs provided by the SoC framework that implement mutexes and critical regions:

sd_mutex_new sd_mutex_acquire sd_mutex_release

sd_nvic_critical_region_enter sd_nvic_critical_region_exit

Regards,

Carles