RE: RE: Quickstart on MPC555 with GNU C

Hi James,

 

Yep, thanks, I found them. I just never took the time to actually look
around on the website for it. I just searched one time for "archive" and
found nothing (because they don't call it archive, but rather "old
messages", or something like that). 

 

I can't tell if those two messages 2661 and 2708 apply to me situation or
not, need to go look at the MODCK bits and understand what is going on with
them. My debugger pretty much lost it's mind when the code wrote to that
register (I mean, the PC register value was altered to garbage, and all the
other registers to). 

 

Sorry Allan, for calling you Dobbin, I took the wrong name. 

 

I'll investigate and see what I can figure out.

 

Appreciate the help,

 

Dave

 

 

  _____  

From: [email protected] [mailto:[email protected]] On Behalf Of
James Smith
Sent: Wednesday, April 20, 2005 5:11 AM
To: [email protected]
Subject: Re: [MPC500] 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]
>
>
>
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James Andrew Smith
PhD Candidate, Mechanical Engineering
Ambulatory Robotics Lab
McGill University
Web: www.cim.mcgill.ca/~jasmith
Phone: 514-398-8054



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