Astrobe Forum

This way round, it's rather tedious for every special register but okay, I understand.

An application related example, is the global interrupt en/disable set in the PRIMASK register.

I'm developing on a bare metal M4 target (Apollo-2).
According to ARM prog. manual all the registers " APSR, IPSR, EPSR, IEPSR, IAPSR, EAPSR, PSR, MSP, PSP, PRIMASK, BASEPRI, BASEPRI_MAX, FAULTMASK, or CONTROL" are MSR /MRS accessible only , so quit alot ...

Yes I know, but why there exists a convenient SYSTEM.VMSR() function but not a more useful SYSTEM.MSR() ?

Hi,

I want to set some registers which can be only accessed via MSR instructions.
So where can i find regarding SYSTEM functions for it ?

Thanks,
Marc

Hi,

according the Cortex-M4 examples, the procedure SYSTEM.VMSR(0) is invoked, which seems to be an assembler equivalent for the unmapped FPSCR register.
Sadly this procedure is not documented somewhere , so I'm asking myself are there more undocumented instances like this ?

Regards,
Marc