RE: 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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