Data flash

See embedded comments!

Also need to clear the IPE bit when done.

Jerry.

> -----Original Message-----
> From: dibosco [mailto:R...@apostrophe.org.uk]
> Sent: Thursday, March 27, 2003 5:27 PM
> To: m...@yahoogroups.com
> Subject: [motoroladsp] Data flash
>
>
> I have a few questions on data flash:
>
> 1. Is  the "XMEMORY" dialogue box that comes up in Codewarrior when
> you select "Data | View Memory" showing what's in Data Flash from
> 0x2000 (for the 807)? I've got an 807EVM and Codearrior, btw.

Yes, assuming you are in internal address mode (EX=0).

>
> 2. Can anyone see why the following simple routine might not be
> programming the data flash? I've followed the instructions in section
>  5.10.1 of the manual to no avail. (Missgin out step 3 as I'm not
> bothered about interrupts at the moment.)
>
> char ProgramFlash(int FlashData,int FlashAddress)
> {
>
>       if ((DFIU_CNTL & 0x3F) == 0)                    //
>       // Ensure flash is idle

        DFIU_CNTL also has the busy bit in it,
        if (!(DFIU_CNTL & 0x803F))

>               {
>               DFIU_PE |= 0x4000;                             
>       // Set IPE bit

        DFIU_PE needs the Row Number in it in addition to IPE enable.
                DFIU_PE = ((FlashAddress & 0x7fff) >> 8) | 0x4000;

>               DFIU_ADDR = (FlashAddress  + DATA_FLASH_BASE); 
>               // Write the flash

        DFIU_ADDR is a read only register!!!
        you write to flash by writing the data into the actual address.
        *FlashAddress = FlashData;

> address to be written to
>               DFIU_DATA = FlashData;                         
> //  then the word to be written

                DFIU_DATA is a read only register!!!

>               while ((DFIU_CNTL & 0x8000) == 1);      // Wait

        The above will never be equal to 1!!!
                while (DFIU_CNTL & 0x8000) ; or ((DFIU_CNTL & 0x8000) == 0x8000)

> until the busy flag is
> cleared
>               return 1;
>       }
>       else
>       {
>               return 0;
>       }
> }
> 
> 3. Finally, does anyone have an algorithm for reading data flash?
> There doesn't seem to be anything in the manual about it.

        just read the data:  value = *FlashAddress;
>
> Cheers,
>
> Rob.
>
>
>
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