Handle FPU IRQ with FreeRTOS and SDK 14.2.0

[WestCoastDaz]

I am in the process of porting a current production application from SDK 13.0.0 to SDK 14.2.0  https://devzone.nordicsemi.com/f/nordic-q-a/39494/dfu-migration-sdk-13-0-0-s132-sd-4-0-3-to-sdk-14-2-0-s132-sd-5-0-0 and I noticed the current was high due the the FPU interrupt not being handled.  We use FreeRTOS configured for tickless idle in our designs and when I checked the port_cmsis_systick.c file between SDK 13.0.0 and SDK 14.2.0 I noticed that

#if(__FPU_USED == 1)
              __set_FPSCR(__get_FPSCR()  & ~(FPU_EXCEPTION_MASK));
              (void) __get_FPSCR();
              NVIC_ClearPendingIRQ(FPU_IRQn);
#endif

was missing from vPortSuppressTicksAndSleep().  It looks like this would be handled if I used the nrf_pwr_mgmt library in SDK 14.2.0 but this library doesn't seem compatible with FreeRTOS in tickless mode since it calls sd_app_evt_wait().  The example HRS with FreeRTOS also doesn't call nrf_pwr_mgmt.  So my question is what is the recommend way to handle the FPU interrupt when using FreeRTOS with tickless idle enabled?

Thanks!

[Susheel Nuguru]

Hi Darren,

This part of code needed to be removed as there were applications who wanted to handle the FPU interrupts explicitly in their own way. 

In your case you can simply implement the FPU irq handler as mentioned in this thread