mask FPU IXC exception

RE: mask FPU IXC exception

Susheel Nuguru — Tue, 01 Dec 2020 14:08:31 GMT

Please take a look at nRF53 FPU - Floating point unit (FPU) exceptions. The exceptions can be masked with this new additions of the newer member of the nRF family.

RE: mask FPU IXC exception

Anthony Ambuehl — Fri, 07 Feb 2020 16:04:09 GMT

That unfortunately does make the FPU interrupt pretty useless. I'll leave it disabled during our algorithm processing.

Is it possible to request additional hardware features for future version of the nrf5* series? A mask would be really helpful or simply disconnecting IXC as other vendors have done.

RE: mask FPU IXC exception

Susheel Nuguru — Fri, 07 Feb 2020 12:21:54 GMT

Hi Anthony,

If you are getting an FPU_IRQ then we can be quite certain that if this is due to IXC then it is connected to the interrupt.

You can confirm that this is the exception flag that is generating the FPU exception if inside the FPU_interrupt there is no other flag set apart from IXC. Unfortunately there does not seem to be any masking of exceptions inside the FPU level. The interrupt can only be masked at NVIC level which will mask other exceptions along with IXC.