Search found 6 matches

by Marc
Thu Oct 25, 2018 12:41 pm
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: SYSTEM function for special register
Replies: 7
Views: 6027

Re: SYSTEM function for special register

This way round, it's rather tedious for every special register but okay, I understand.
by Marc
Thu Oct 25, 2018 10:44 am
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: SYSTEM function for special register
Replies: 7
Views: 6027

Re: SYSTEM function for special register

An application related example, is the global interrupt en/disable set in the PRIMASK register.
by Marc
Thu Oct 25, 2018 10:42 am
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: SYSTEM function for special register
Replies: 7
Views: 6027

Re: SYSTEM function for special 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 ...
by Marc
Thu Oct 25, 2018 10:26 am
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: SYSTEM function for special register
Replies: 7
Views: 6027

Re: SYSTEM function for special register

Yes I know, but why there exists a convenient SYSTEM.VMSR() function but not a more useful SYSTEM.MSR() ?
by Marc
Thu Oct 25, 2018 9:44 am
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: SYSTEM function for special register
Replies: 7
Views: 6027

SYSTEM function for special register

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
by Marc
Mon Oct 22, 2018 8:25 am
Forum: Astrobe for ARM Cortex-M3, M4 and M7
Topic: Documentation of Module SYSTEM
Replies: 1
Views: 2479

Documentation of Module SYSTEM

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