LF2402 Flash Password

Hi,
today I created a prototype board with a TMS320LF2402. After I finally
managed to get the serial bootloader running I accidantly changed the
password by loading the new hex file into the flash. I wanted to test the
board with a very simple prgramm I found on a germany universities website.
It was originally writen for the LF2407.
Now I have to find out what words have been written to 0x40-0x43 right?

This is the beginning of the hex file I used:

0040    //start address
00fa    //size
0040    //start address
0000
bf08    //1st word of password?
8000    //2nd word of password?
bf09    //3rd word?
8000    //4th word?
be42
bf00
be47
bf80
013a
b801
e388
004e
7a89
0052
7a89
00be
7a89
00b4

I tried the password as shown above but it didn't work.
Password.h looks like this:
PASSWD1 .set   bf08h
PASSWD2 .set   8000h
PASSWD3 .set   bf09h
PASSWD4 .set   8000h

I can't figure out what's wrong. It would be great if someone has a solution
to this.
Thanks

P.S. is there some example code for the LF2402? Do I need a special include
file or can I use the one for LF2407? The link to the site where I found the
code is http://www.fh-zwickau.de/tutorial/dsp/

Martin

Hi Martin

I did the same thing with that code about a year ago. Its a pain aye,
couldn't understand at the time why I could only program once. I
forget exactly what I did to fix it but I was using the  serial flash
programing code, the plugin is probably easier. I think I had to
change the password in the serial loader, password.h, and then
recompile the serial loader. Then write code that writes 00000's or
fffff's to the space, reprogram it to unlock it. After that it was
just a matter of avoiding useing that space and restoring the serial
loader.

You sound like your on the right track. The 2402A is the same to code
for as the 2407A apart from the different memory mapping, you will
need to change your .cmd file to reflect the new layout, something
like this:

MEMORY	
{              

 	PAGE 0: /* Program Memory */
	  VECS:  origin = 00000h, length = 00040h /* internal FLASH */
	  FLASH: origin = 00044h, length = 01fBBh /* 2000-45 internal FLASH
*/
	  										
 	PAGE 1:	/* Data Memory */ 
    	B2:             org=00060h,   len=00020h   	/* internal DARAM */
    	B0:             org=00200h,   len=00100h   	/* internal DARAM */
    	B1:             org=00300h,   len=00100h   	/* internal DARAM */
    	SARAM:          org=00800h,   len=00200h   	/* internal SARAM */

} /* end of MEMORY */

etc... (you should check this, cut and paste from old file)

The only other differences are the ones you will notice now that you
are running from a flash only part, like only being able to have only
one hardware breakpoint, slow programming, probably not be able to
step code, memory initialisation problem etc

Hope it goes well for you though
Tony McKay