Re: RE: Quickstart on MPC555 with GNU C

Hi Dave,

The archived messages can be found here:

http://groups.yahoo.com/group/MPC500/messages

There's a search box that allows you to look for specific message IDs 
(like 2661 and 2708... unless Allan was referring to the older 
1999-2001 archive  which can be found here: 
http://www.cim.mcgill.ca/~jasmith/docs/MPC555_archive).

:-)

James

On 20-Apr-05, at 8:57 AM, David Eicher wrote:

>
> Hi Dobbin,
>
>
>
> Sorry, I missed your first sentence there about message #2661 and 
> #2708.
> Where do I find those? Is that in an archive, I have not figured out 
> how to
> access the archives that I've heard people refer to.
>
>
>
> Thanks,
>
>
>
> Dave
>
>
>
>
>
>   _____
>
> From: [email protected] [mailto:[email protected]] On Behalf 
> Of
> David Eicher
> Sent: Tuesday, April 19, 2005 3:40 PM
> To: [email protected]
> Subject: RE: [MPC500] RE: Quickstart on MPC555 with GNU C
>
>
>
> Hi Dobbin,
>
>
>
> 1) What is a basic operation?
>
> 2) Why would a basic operation crash the processor?
>
> 3) I didn't write the code, it came with the Motorola quickstart 
> package,
> shouldn't it be safe to assume that code that Motorola writes for 
> their own
> processor should work okay? Why would it crash the processor?
>
> 4) The programming environments manual for the MPC555 explained all 
> about
> writing the PLPRCR. It didn't say anything that I saw about being 
> careful
> about when or how one writes the register for risk of crashing the
> processor. Did you see some documentation that explained that?
>
>
>
> Thanks,
>
>
>
> Dave
>
>
>
>
>
>
>
>
>
>   _____
>
> From: [email protected] [mailto:[email protected]] On Behalf 
> Of
> Dobbin Allan-r11834
> Sent: Tuesday, April 19, 2005 6:28 AM
> To: '[email protected]'
> Subject: RE: [MPC500] RE: Quickstart on MPC555 with GNU C
>
>
>
> See previous messages #2661 and #2708.
>
> Sounds like you are looking for flaws in the processor before reading 
> any
> documentation.  Setting the system clock using the PLPRCR[MF] is a 
> basic
> operation.
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf 
> Of
> David Eicher
> Sent: Tuesday, April 19, 2005 8:45 AM
> To: [email protected]
> Subject: [MPC500] RE: Quickstart on MPC555 with GNU C
>
>
>
> In the appconfig.h file (generated by the configuration tool) there are
> comments about the change in divide ratio for the PLL. It is switching 
> the
> board to low power mode and dropping the CPU clock from 40Mhz to 
> 20Mhz. I
> just commented out the #define for now to remove this code since it 
> cause
> the machine to crash. I'll study that problem later, will let it run at
> 40Mhz for now.
>
>
>
> Regards,
>
>
>
> Dave
>
>
>
>
>
>   _____
>
> From: David Eicher [mailto:[email protected]]
> Sent: Monday, April 18, 2005 7:09 PM
> To: '[email protected]'
> Subject: Quickstart on MPC555 with GNU C
>
>
>
> Hello list,
>
>
>
> After getting some help fixing the initialization of pointers, my code 
> is
> executing into the 5xx_board_init.c stuff. The code writes to the 
> PLPRCR
> into the MF bits, I believe it is to change the Phase lock loop divider
> ratio. The computer loses it's mind right there, it crashes and will 
> not do
> anything after that. There is a loop in the code after this write to 
> the
> register that is suppose to test the SPLS bit and wait there until the 
> loop
> locks again.
>
>
>
> Are there any known problems with writing to this register on the 
> MPC555? I
> suppose I'll have to comment this out for now so I can debug the 
> remainder
> of the code but will eventually need to know what to do with this code.
>
>
>
> I did talk to a coworker at work who has had some experience with this
> processor and he said it does have quite a few issues, the MPC565 is a 
> much
> more mature part, according to him. Maybe this is one of the issues?
>
>
>
> Thanks,
>
>
>
> Dave
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> -----------------------------------------------------------
> To learn more about Freescale Microcontrollers, please visit
> http://www.freescale.com/mcu
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
> -----------------------------------------------------------
> 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]
> <mailto:[email protected]?subject=Unsubscribe>
>
> *      Your use of Yahoo! Groups is subject to the Yahoo!
> <http://docs.yahoo.com/info/terms/>  Terms of Service.
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> -----------------------------------------------------------
> 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]
> <mailto:[email protected]?subject=Unsubscribe>
>
> *	Your use of Yahoo! Groups is subject to the Yahoo!
> <http://docs.yahoo.com/info/terms/>  Terms of Service.
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> -----------------------------------------------------------
> To learn more about Freescale Microcontrollers, please visit
> http://www.freescale.com/mcu
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
James Andrew Smith
PhD Candidate, Mechanical Engineering
Ambulatory Robotics Lab
McGill University
Web: www.cim.mcgill.ca/~jasmith
Phone: 514-398-8054



-----------------------------------------------------------
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/