RE: Program variable on the internal flash of MPC566 on runtime

What you are trying to attempt sounds tricky.  You will need to buffer the results in as much SRAM as you can afford and then this defines your minimum programming interval.  You have to calculate your programming time and make sure you can re-program before your RAM buffer refills.  Additionally, you probably require two RAM buffers - one for the currently programming data and another for new results from QADC whilst the programming operation is happening.

You can program FLASH while your code is running and taking QADC conversions.  You have to run your code from one of the two FLASH arrays while programming the other i.e. your FLASH programming code and QADC fetch routines will all resdide in one FLASH array (or SRAM) while programming the 2nd FLASH array.

You will have to ensure the FLASH array is erased before you kick all this off to save time otherwise your RAM buffer (for QADC results) has to be even larger.

If you are really struggling, you can compress the 10-bit result so as not to waste 6-bits per conversion in your RAM buffer.  

Sounds like a strange application.

Good luck,
Allan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Paiboon Sriwilaijaroen
Sent: Thursday, April 21, 2005 10:56 AM
To: [email protected]
Subject: RE: [MPC500] Program variable on the internal flash of MPC566 on runtime



Hi
I want to save total 64Kbyte(SRAM on chip only 36 Kbyte) of data in the 
internal flash. Actually I want to save result from 32 channels 10 
bits/channel from QADC  for every 1 ms for 1 sec to flash memory in runtime

Can I program data to flash in runtime?

Thank you
PS

>From: Dobbin Allan-r11834 <[email protected]>
>Reply-To: [email protected]
>To: "'[email protected]'" <[email protected]>
>Subject: RE: [MPC500] Program variable on the internal flash of MPC566 
>on
>runtime
>Date: Thu, 21 Apr 2005 07:37:38 -0700
>
>Are you saying that you want to save the QADC conversion result to 
>FLASH
>just because the SRAM is too small?  This sounds like quite a lot of work 
>just to save a couple of bytes of SRAM.  If you want to store this result 
>in FLASH so that it is available after reset, that is a valid reason.  But 
>if you want to save it to FLASH just to save a few bytes of SRAM, that 
>sounds unreasonable and you may want to reconsider.
>
>Regards,
>Allan
>
>-----Original Message-----
>From: [email protected] [mailto:[email protected]] On Behalf 
>Of
>crbtfp
>Sent: Wednesday, April 20, 2005 2:22 PM
>To: [email protected]
>Subject: [MPC500] Program variable on the internal flash of MPC566 on 
>runtime
>
>
>
>
>Hi
>
>I have axiom 566EVM. I use Code Warrior 8.0. I do the sampling of 
>analog signal by QADC64E. Because SRAM is too small.I want to save this 
>result in internal flash memory on runtime. Can I do that? I 've tried 
>to program to flash on runtime by save the output result of QADC64E to 
>a variable in SRAM then I want to program that variable to internal 
>flash on runtime. The mpc566 ref. manual is unclear, how to write to 
>address data latch and how to program to program data latch of MPC566. 
>I can not make EHV bit go high(=1) Does anyone have recommendations?
>
>And Does anyone know how many times can I program to the internal flash 
>memory? one manual said 1000 times another manual said 100000 times
>
>
>Thank you very much
>PS
>
>
>




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