RE: Toucan softreset issue

Hello Allan 
Thanks for the information. As I mentioned earlier the
clearing of EE bit fixes the problem. I am wondering
whether there is any other way to confirm that this is
exacly what is happening ? Any ideas ? Do you have any
other document regarding CDR_AR_1120 ? More
discription or test report ? 

Sudhersan


--- Dobbin Allan-r11834 <[email protected]>
wrote:

> It's possible.  Look at errata CDR_AR_214 and 1120. 
> Follow the
> workaround i.e. clear EE before performing the soft
> reset and see if
> this fixes your problem.
> 
> - Allan
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf
> Of Sudhersan Lal
> Sent: Monday, April 03, 2006 2:27 PM
> To: [email protected]
> Subject: RE: [MPC500] Toucan softreset issue
> 
> 
> Hello Allan 
> Thanks for the information . I was doing little bit
> more analysis regarding the Reset issue (external
> watchdog) suring CAN softreset. Looks like our SPI
> communication is
> disturbed during this time thus causing an external
> watchdog timeout .  
> 
> At this point of time we are suspecting that we are
> loosing some SPI interrupts when we are making a
> soft
> reset at the TOUCAN module . 
>  
> The MPC 563 Errata sheet says the following 
> 
> ---------------------------------------------------
> USIU: Interrupt Controller may generate vector 0x0
> or
> has no request indication
> DESCRIPTION:
> When software masks interrupt requests, clears
> interrupt flags, stops or disables a
> module, or masks or changes interrupt logic in the
> UIMB or the USIU interrupt
> controller while MSR[EE] = 1, the interrupt request
> may disappear during or after
> the RCPU has acknowledged the external interrupt
> exception. It may also occur after
> re-enabling interrupts in the RCPU.
>
------------------------------------------------------
> As I mentioned earlier the The
> problem(reset,external
> watchdog) goes away when I  disable interrupts
> during
> TOUCAN soft reset .
>  
> So I am wondering whether I am observing the same
> situation as specified in the errata sheet (loosing
> SPI interrupt). 
> Do you think this would be possible ? 
> 
> Regards
> Sudhersan
> 
> --- Dobbin Allan-r11834 <[email protected]>
> wrote:
> 
> > There is no undocumented interrupt during soft
> > reset. The softreset
> > takes less than 20 can (IMB) clocks.
> > 
> > So you take a reset when you perform a softreset
> on
> > CAN_B while CAN_A is
> > in bus off, and if you disable interrupts (CAN_A,
> > CAN_B, EE ?) just
> > before performing a softreset, your code runs as
> > expected?
> > 
> > Is it possible you're simply not handling your
> > interrupts correctly i.e.
> > if you handle interrupts without doing a
> softreset,
> > do you still get a
> > reset?
> > 
> > Perhaps you could explain the interrupts in more
> > detail i.e. which
> > interrupt do you disable to avoid the problem? 
> Are
> > you taking a BUS OFF
> > exception i.e. are you performing softreset within
> > busoff ISR? If you do
> > not perform softreset, can you confirm that your
> > interrupt handles
> > correctly?
> > 
> > Regards,
> > Allan
> > 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]] On Behalf
> > Of Sudhersan Lal
> > Sent: Friday, March 24, 2006 9:48 AM
> > To: [email protected]
> > Subject: RE: [MPC500] Toucan softreset issue
> > 
> > 
> > Hello Allan
> > I am doing a softreset for the TOUCAN Module
> during
> > the bus off interrupt. Is there any possibility of
> > generating any other kind of interrupt during soft
> > reset (documented / undocumented ) ? In general
> how
> > long it will take to complete the softreset
> > functionality ? 
> > 
> > The only mistake I did was , I was doing a
> softreset
> > on CAN B when detected bussoff in CAN A.  But
> > according to the documentation , this should not
> > cause
> > any other issues or interrupts . The
> > problem(reset,external watchdog) goes away when I
> > disable interrupts during soft reset .
> > 
> > Regards
> > Sudhersan
> > 
> > 
> > --- Dobbin Allan-r11834
> <[email protected]>
> > wrote:
> > 
> > > Please explain exactly what problems you are
> > seeing.
> > > 
> > > - Allan
> > > 
> > > -----Original Message-----
> > > From: [email protected]
> [mailto:[email protected]] On 
> > > Behalf Of Sudhersan Lal
> > > Sent: Friday, March 24, 2006 7:52 AM
> > > To: [email protected]
> > > Subject: [MPC500] Toucan softreset issue
> > > 
> > > 
> > > Hello All
> > > I am facing some problems with TOUCAN softreset
> functionality. When 
> > > I am disabling the interrupts during the soft
> reset , the problems 
> > > goes away. Wondering anybody else has faced this
> problem
> > before
> > > ?
> > > 
> > > Is there any recommendations like disable
> > interrupts
> > > during toucan softreset ? Is there any errata
> > > avaialbe
> > > with respect to this other than one "CAN: Bus
> Off
> > > recovery not ISO compliant" ?
> > > Regards
> > > Sudhersan
> > > 
> > > 
> > >
> __________________________________________________
> > > Do You Yahoo!?
> > > Tired of spam?  Yahoo! Mail has the best spam
> > > protection around
> > > http://mail.yahoo.com
> > > 
> > > 
> > >
> >
>
-----------------------------------------------------------
> > > To learn more about Freescale Microcontrollers,
> > > please visit
> > > http://www.freescale.com/mcu
> > > 
> > > 
> > >  
> > > Yahoo! Groups Links
> > > 
> > > 
> > > 
> > >  
> > > 
> > > 
> > > 
> > > 
> > 
> > 
> > __________________________________________________
> > Do You Yahoo!?
> > Tired of spam?  Yahoo! Mail has the best spam
> > protection around
> > http://mail.yahoo.com 
> 
=== message truncated ===


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 


-----------------------------------------------------------
To learn more about Freescale Microcontrollers, please visit
http://www.freescale.com/mcu


 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/MPC500/

<*> To unsubscribe from this group, send an email to:
    [email protected]

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/