Hi guys,
I'm trying to record user button pushes to INFO Flash with the
saveProgram() routine below. The first time the routine is called it
works fine. The second time the routine is called it does not rewrite
the locations. In fact, in some of the locations it writes in a zero.
Stepping through the statements I can't find why it would do that, all
the necessary registers seem to be ready with the write values. DUring
debugging when I removed the line where I set the Flash pointer to
0x1000 (to see if it would at least append) the values do indeed
append. Anyone seen something like this? Thanks!

-Adeel

void saveProgram(void)
{
  unsigned int i=0;
  
  FCTL3 ^= (FXKEY + LOCK); // unlock flash to write
  FCTL1 ^= (FXKEY + WRT); // enable write to flash
  
  Flash_ptr = (char *) 0x1000; // initialize flash pointer to first
flash address
  for (i=0; i<64; i++)
  {
    *(Flash_ptr++) = eventMem[i];
    while ((FCTL3 & WAIT) != WAIT);
  }
  FCTL3 ^= (FXKEY + LOCK); // lock flash to write
  FCTL1 ^= (FXKEY + WRT); // disable write to flash
}

You've not erased the flash before rewriting it, methinks. 

Also, if you've not done that, have you also not set FCTL2 to get the
right timing for the FTG?

-- Paul.

> -----Original Message-----
> From: Adeel [mailto:a2ahmad@a2ah...] 
> Sent: 19 September 2004 19:27
> To: msp430@msp4...
> Subject: [msp430] Problem rewriting previous locations in FLASH?
> 
> 
> Hi guys,
> I'm trying to record user button pushes to INFO Flash with the
> saveProgram() routine below. The first time the routine is 
> called it works fine. The second time the routine is called 
> it does not rewrite the locations. In fact, in some of the 
> locations it writes in a zero.
> Stepping through the statements I can't find why it would do 
> that, all the necessary registers seem to be ready with the 
> write values. DUring debugging when I removed the line where 
> I set the Flash pointer to 0x1000 (to see if it would at 
> least append) the values do indeed append. Anyone seen 
> something like this? Thanks!
> 
> -Adeel
> 
> void saveProgram(void)
> {
>   unsigned int i=0;
>   
>   FCTL3 ^= (FXKEY + LOCK); // unlock flash to write
>   FCTL1 ^= (FXKEY + WRT); // enable write to flash
>   
>   Flash_ptr = (char *) 0x1000; // initialize flash pointer to 
> first flash address
>   for (i=0; i<64; i++)
>   {
>     *(Flash_ptr++) = eventMem[i];
>     while ((FCTL3 & WAIT) != WAIT);
>   }
>   FCTL3 ^= (FXKEY + LOCK); // lock flash to write
>   FCTL1 ^= (FXKEY + WRT); // disable write to flash }
> 
> 
> 
> 
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> 

You're right I did not erase the flash after the initial write... I 
thought unlocking and enabling write would be enough. I will look 
into that. I did not set the source clock myself because I actually 
wanted to use ACLK (00). I need to change that?
Thanks much Paul.
Cheers...


--- In msp430@msp4..., "Paul Curtis" <plc@r...> wrote:
> You've not erased the flash before rewriting
it, methinks. 
> 
> Also, if you've not done that, have you also not set FCTL2 to get 
the
> right timing for the FTG?
> 
> -- Paul.
> 
> > -----Original Message-----
> > From: Adeel [mailto:a2ahmad@y...] 
> > Sent: 19 September 2004 19:27
> > To: msp430@msp4...
> > Subject: [msp430] Problem rewriting previous locations in FLASH?
> > 
> > 
> > Hi guys,
> > I'm trying to record user button pushes to INFO Flash with the
> > saveProgram() routine below. The first time the routine is 
> > called it works fine. The second time the routine is called 
> > it does not rewrite the locations. In fact, in some of the 
> > locations it writes in a zero.
> > Stepping through the statements I can't find why it would do 
> > that, all the necessary registers seem to be ready with the 
> > write values. DUring debugging when I removed the line where 
> > I set the Flash pointer to 0x1000 (to see if it would at 
> > least append) the values do indeed append. Anyone seen 
> > something like this? Thanks!
> > 
> > -Adeel
> > 
> > void saveProgram(void)
> > {
> >   unsigned int i=0;
> >   
> >   FCTL3 ^= (FXKEY + LOCK); // unlock flash to write
> >   FCTL1 ^= (FXKEY + WRT); // enable write to flash
> >   
> >   Flash_ptr = (char *) 0x1000; // initialize flash pointer to 
> > first flash address
> >   for (i=0; i<64; i++)
> >   {
> >     *(Flash_ptr++) = eventMem[i];
> >     while ((FCTL3 & WAIT) != WAIT);
> >   }
> >   FCTL3 ^= (FXKEY + LOCK); // lock flash to write
> >   FCTL1 ^= (FXKEY + WRT); // disable write to flash }
> > 
> > 
> > 
> > 
> > ------------------------ Yahoo! Groups Sponsor 
> > --------------------~-->
> > $9.95 domain names from Yahoo!. Register anything.
> > http://us.click.yahoo.com/J8kdrA/y20IAA/yQLSAA/CFFolB/TM
> > --------------------------
> > ------~-> 
> > 
> > .
> > 
> >  
> > Yahoo! Groups Links
> > 
> > 
> > 
> >  
> > 
> > 
> > 
> > 
> >