Brownout Detection

arm-user · **Joined:** Fri Mar 24, 2006 5:33 pm **Posts:** 6

Hello,

I want to use the Brownout Detection. Therefore I have to set the GPNVM Bits 0 and 1.

I tried

Code:

AT91F_MC_EFC_PerformCmd(AT91C_BASE_MC, 0x5A000000 | AT91C_MC_GPNVM0 | AT91C_MC_GPNVM1 | AT91C_MC_FCMD_SET_GP_NVM); 

but this seems to be no good idea, because the system hangs up...

What is the correct way to set a GPNVM Bit???
Sorry but I did not find anything about it in this forum.

Thanks Thomas

tomcroban · **Posted:** Fri Jun 09, 2006 4:57 pm

Look here:
http://www.at91.com/www/phpBB2_mirror/v ... hp4?t=1834

The project has as the first function the setup for Enable_Brown_Out_Detection.

Good Luck!

dspaude · **Posted:** Tue Jun 19, 2007 5:29 pm

Anyone have a current link to the project mentioned above? I am having the same problem where whenever I write to the EFC to set or clear a GPNVM bit the system hangs. The bit is set or cleared successfully, but why does the system hang? I have the function running from SRAM and I disable interrupts before giving the commands. I am basically using the same routine as the Lock/Unlock for the EFC, except I am using the GPNVM commands (rather than Lock or Unlock).

Thanks,
Darrik

AndrewNSpencer · **Joined:** Sat Jul 04, 2009 3:50 pm **Posts:** 1

Was there ever an answer to this? I am experiencing similar problems. Every time I try to set GPNVM0, the micro resets. The set operation is running in a RAM function, with interrupts disabled and I stay in the function until FRDY flags the operation is over - only it never seems to complete, and the micro simply resets. FMCN is correct and set up - not sure where else to look for this.

gerhardf · **Joined:** Thu Dec 02, 2004 2:28 pm **Posts:** 454

hello
enclosed you can find an old example project where this problem is handled. look at module flash.c

regards
gerhard

Brownout Detection

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