Lpc2000

----- Original Message ----- 
From: "sig5534" <sig5534@...>
To: <lpc2000@yahoogroups.com>
Sent: Thursday, February 23, 2006 4:56 AM
Subject: [lpc2000] IAP throwing Undefined Instruction on some units


> CPU: LPC2104
> Compiler: GCCARM
> 
> This is a really strange problem.  I am using IAP on some of my 
> internal routines, my code was basically done for sometime now.  
> Everything was working.  I built somemore proto boards and now a 
> problem has shown up on 2 out of 11 boards.
> 
> When the IAP call executes to do a CopyRamToFlash, the CPU locks up 
> going into the UIE vector (Undefined Instruction Exception). I ran a 
> trace over and over again and the flash parameters are all setup 
> right, but after the jump up into the high mem builtin IAP handler, 
> it locks up the CPU at the UIE vector (0x38).  It never comes back 
> from the IAP(CopyRamToFlash) call.
> 
> I can't understand this.  On 9 of the boards it works but on these 2 
> it does not.  Same problem on both.  I have a 24MHz xtal and PLL set 
> to 48Mhz.  I have tried calling the IAP() routine using either 24 or 
> 48 MHz but it makes no difference.  The built in IAP routine is going 
> into the weeds, but only on some units.
> 
> Everything else on the PCBs is working normally, and the CPU is 
> executing the rest of the code fine.  It is just that IAP() routine 
> that is going nuts, and only on the CopyRamToFlash function.  The 
> other calls like IAP erase sectors etc. are fine.
> 
> Other than the flashparameters, I do not see much else I can do to 
> control the situation.  The IAP routine goes into the weeds on some 
> LC2104 units but not on others.  Same code.  Really strange.  About 
> the only thing I see left to do is change the CPUs.  Yet they take 
> programming up the UART0 port.  Bizarre.
> 
> Anyone have any ideas on this?

What silicon revision?

Leon