Lpc2000

Is P0.14 at a HIGH level after reset?  If it is LOW, the boot code 
will execute the ISP command handler, even if checksum is valid.  See 
page 177 of User Manual.


--- In lpc2000@yahoogroups.com, "tendoskeleton" <tendoskeleton@y...> 
wrote:
> Hello,
> 
> I have written code that download an AIF into flash, so it doesn't 
> have to download eacht time. Just by power up, the code will 
execute. 
> 
> Now this downloading goes great and it even works :), but not in 
the 
> way I want to.
> 
> When I manualy put the uC in user boot mode (register MEMMAP = 0x1)
> and I manually set the PC to 0x00000000 (reset vector) with a 
> debugger and let it run, the program works great (read: it blinks 
the 
> leds like I programmed)
> 
> So now comes the problem; it doesn't do this automatically by power 
> up. The LPC2104 has to detect valid user code and will check 0x14 
for 
> this. In my case there is 0x99FFFF68 (the two complements of the 
> checksum of the other vectors.
> 
> My situation
> 
> Interrupt vector table Flash: 
> 
> 0x00 ea00001c
> 0x04 ea000015
> 0x08 ea000015
> 0x0c ea000015
> 0x10 ea000015
> 0x14 99ffff68
> 0x18 ea000014
> 0x1c ea000014
> 
> I think the reason why it doesn't work is because the uC doesn't 
> detect valid user code and so it doesn't goes into user boot mode, 
> put the pc to 0 and execute (like what I did manually)
> 
> Can you guys confirm that I calculated the right 2 compl. checksum, 
> or did I understand something wrong:
> 
> ea00001c + ea000015 + ea000015 + ea000015 + ea000015 + 99ffff68 + 
> ea000014 + ea000014 = 0 (32 bits). Right????
> 
> So any suggestion what I have to do to get it execute my user code 
> automatically after powerup?
> 
> Thanks alot
> 
> Bob