Lpc2000

Hi Greg,

one thing that I have seen before that ended up with the same symptoms
your are describing is an IAP call with the wrong frequency. What I am
referring to is you boot up let's say with 14.756 MHz and do some IAP
calls, then you enable the PLL and still call IAP with the same 14.756
although now it is 59 MHz. 
I have seen the programming work "most of the time" but one bit or one
byte being incorrect.

May be this helps, Bob

--- In lpc2000@yahoogroups.com, "fl429" <fl429@...> wrote:
>
> Hi, Folks,
> 
> Hopefully, someone can shed some light to this. Thanks.
> 
> First, this is not my first app on the LPC2138. I had no trouble 
> before, until I use IAP in this one.
> 
> The IAP calls seem working OK. No error reported. Flash memory does 
> program as expected, as far as I can see.
> 
> But, a simle C structure in one of the functions now behaves wierdly 
> SOMETIMES. This is called repeatedly in a loop.
> 
> switch(m_CmdTmp) {
> case 1:
>     ..... codes here
>     m_CmdTmp=2;
>     break;
> case 2:
>     if(!Started()) {
>          Starting();         <<====== Point 1
>          // some other stuff ... here
>          m_CmdTmp=3;
>     }
>     break;
> case 3:
>     ...
>     break;
> }
> 
> After some poking around, I found I am at Point 1 while m_CmdTmp 
> already equals 3 (m_CmdTmp=3).
> There is no interrupts changing the value of m_CmdTmp behind my 
> back ! m_CmdTmp is supposed to progress ONLY in this switch routine.
> 
> I tried to change stack sizes to no avail. I reserved 256 bytes from 
> the TOP of SRAM (0x400007e00 and up) from being used by this APP. 
> No, I still have this problem.
> 
> Any ideas ?
> 
> Thanks a lot,
> 
> Greg
>