Lpc2000

--- In lpc2000@yahoogroups.com, "misstero" <suriyant@...> wrote:

> Our problem occur when modem connected that DCD is active (Active Low
> same as bootloader mode request) and LPC2xxx is reseted which may
> cause by unstable power or external reset via RESET pin by
> supervisory. This made LPC2xxx  go into bootloader mode forever cannot
> return back to our application code even modem's DCD inactive later.
> Only power cycle both LPC2xxx and modem to restart it to application
> code. This case unaccetable when devices are installed in unman
location.

Have you considered using another pin for DCD purposes so that it does
not intefere with Bootloader functions?

> I have an idea to solve this problem but it need help from Philips by
> add time-out in Bootloader mode if it does not have any activity for
> short period of time (etc. 3s) it should be retry to execute
> application code repeatly so I'd like to ask Philips is it possible?

One client had the same problem (was using this pin for a different
purpose though), and they patched the boot loader to use a different
pin to enter Bootloader mode.  Incidentally this pin is determined by
Bootloader firmware, not the hardware.

> Anyone have other ideas to solve this problem? Please share with me. I
> prefer to solve by software first if it possible.

The downside is that Philips will not guarantee your part if you patch
(or replace) the boot loader.

Hope this helps.

Jaya