Lpc2000

Hi,

I also want to write small chunks to the same sector.

I'm using a '2294.  The users manual (table 216 in the IAP section of 
the May 3, 2004 manual and also the 'C' command in the ISP section) 
shows that the destination address must be 512 byte aligned and that 
the number of bytes to write is a multiple of 512 bytes.

I have tried writing smaller areas within the 512 byte "sectors" by 
leaving all unchanged bits set (i.e., prefill the RAM buffer with the 
0xFF and clear only the required bits.)  After struggling with this 
for some time I concluded that the ECC bytes (checks) are written to 
flash on a 512 byte boundary basis, regardless of the fact that there 
is an ECC byte for each 16-bytes of accessible flash.

In short, the internal flash does not behave like a conventional 
flash part.  I can program 512-byte blocks and I can erase sectors.  
In my experience, that's it.  


Tom



--- In lpc2000@yahoogroups.com, "embeddedjanitor" <manningc2@a...> 
wrote:
> 
> I definitely got problems when writing 64 or 32 byte chunks on an 
> LPC2129. After some experimentation I found I could only get 
reliable 
> behaviour with 512 bytes (didn't test bigger).
> 
> Typically, I'd see a few wrong bits out of 64kB. This might have 
been 
> fixed in a more recent bootloader.
> 
> 
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "johnthomasedwardtimm" 
<area51@a...> 
> wrote:
> > 
> > Robert,
> > 
> > Thanks for the reply.  Can I write 32 byte (256-bit) chunks 16 
times 
> > to fill a 4096-bit section?  I believe in a previous email you 
> > mentioned that 256-bit is the maximum size of a chunk you can 
write 
> > to a 4096-bit row that has data in it already.
> > 
> > Thanks,
> > 
> > JT
> >