IAP library for LPC921?

[Scott Su]

I would like to adapt the IAP library that ESAcademy provides for the LPC932 for the LPC921; the two chips are very similar as far as IAP is concerned.  As far as I can tell the only difference is that the LPC921 requires an authorization key before functions that modify the flash can be called.
Has anyone made this adaptation already?  My own attempts so far have not met with success - even trying to invoke the call to read the UCFG1 byte causes the chip to reset.