Lpc2000

Bill W. wrote:

> It may make sense to align cluster size w/flash erase block size.

Indeed.
The 21xx flash memory has got some weird sector seizes.
The 213x series has 8 x 4kB, 14 x 32 kB and then 5 x 4kB (in that order) 
and for the 212x it is even worse: 8 x 8kB, 2 x 64 kB and 7 x 8kB.
The 210x and 211x series use a sector size of 8kB for all their sectors.

You can (as far as I know - never did this myself) perform partial 
programming of a sector. The IAP functions as described in the 213x user 
manual will allow you to write to Flash in 256/512/1024/4096 byte blocks 
but you have to erase sectors on full sector sizes. This will definitely 
not match your FAT file system.

Samuel wrote:

> I need to basically do relative addressing when logging or
> calling the log file, any help will be appreciated

I'm not sure what you mean by "relative addressing"?
If it is just logging data you need to do the easiest way is to just use 
reserve some sectors for logging and start using these without any 
difficult file system. You could either create a directory which tells 
you date/time/filename and the start position of the file in memory or 
define a structure that defines what the block is about and what its 
length is.

Depending on the application and the amount of data I would opt for an 
MMC/SD card for logging. Log the data on your application and then just 
plug the SD card into a PC and a PC application will show your data.
I am going to use this for logging data and updating software (on boot 
check for presence of SD card, check for new software and reprogram 
flash if needed)

See also http://groups.yahoo.com/group/lpc2000/message/9293

Regards,

    Rob