Lpc2000

The JTAG dump does not run at the same speed as the internal FLASH.
(Generally slower).  I would GUESS that you might have the MAM set up
too fast or the PLL too fast.  This could cause FLASH to read back
incorrectly at execution time, but the slower JTAG dump would read it
correctly.  


Dan

 

 

  _____  

From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of albin_martinsson
Sent: Monday, June 27, 2005 11:29 PM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Reading from flash

 

Hi

Anyone knows why I get some bit-errors when I am reading from the 
flashmemory. In my program I store some data (texts and other 
configurations) with the IAP routines. But if I compare the recently 
written data from RAM with the programmed data from Flash there are 
some bits that has changed, resulting in a checksum error for the 
data I have written to Flash. But!  when i do a memory dump from the 
flash memory with the LPC2100-program I always read the correct data.

I read from Flash by pointing a byte pointer like this:

tU8 *ptr;
flashaddress = 0x00020000;
...
ptr = (tU8 *)flashaddress;

When i turned off the MAM funktion the error reduced but there are 
still some errors. 

Can someone explain why this is so?

B.R  /Fredrik Martinsson





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