2009-04-01 04:27:30 Write in the Blackfiin register

Amine Salmen Rekik (TUNISIA)

Message: 71939

Hello

Can you tell me if i can write in the blackfin register when i use uclinux as an OS? indeed i need to configure a timer, so when i write in the register timer11_config, my board reboots.

i tried also to write in the register FIO2_Flag_S (in order to ligth a led) but when i run this program in my board i receive this error "

Data access CPLB protection violation

- Attempted read or write to Supervisor resource,

or illegal data memory access ...."

so can i execute a program in the supervisor mode? if yes, what command should i write

thank you very well

QuoteReplyEditDelete

2009-04-01 04:32:30 Re: Write in the Blackfiin register

Mike Frysinger (UNITED STATES)

Message: 71940

the whole point of using Linux is that you have the OS which is in supervisor mode and you have userspace which is not. there is no way at all to run userspace code in supervisor mode. if you want to program MMRs, you must write a driver.

if you want to do portmuxing/gpios though, do not touch any register directly. there is a framework for managing pins.

when in doubt, search the wiki

docs.blackfin.uclinux.org/doku.php?id=gpio

QuoteReplyEditDelete

2009-04-01 04:32:55 Write in the Blackfiin register

Amine Salmen Rekik (TUNISIA)

Message: 71941

I forgot to say that i use ADSP-BF561_EZ-KIT_Lite as a Board

QuoteReplyEditDelete

2009-04-01 04:43:34 Re: Write in the Blackfiin register

Amine Salmen Rekik (TUNISIA)

Message: 71942