Lpc2000

> 
> The PIN registers are actually RD/WR registers, and not RD only as 
specified
> in the documentation. If you write to the PIN register, it sets the 
pins, as
> specified in the bits. i.e. if you write 0xFFFF0000 to a PIN 
register it will
> set the top 16  GPIO pins high, and the bottom 16 low.
> 
> Regards
>    Anton Erasmus
> 
> [Rest Snipped]
> -- 
> A J Erasmus

Thanks for the informations, I have read this functions but the data 
sheet said is not a legal way of using:

GPIO Pin Value Register (IOPIN - 0xE0028000)

This register provides the value of the GPIO pins. This value 
reflects any outside world influence on the pins.

Note: for test purposes, writing to this register stores the value in 
the output register, bypassing the need to use both the IOSET
and IOCLR registers. This feature is of little or no use in an 
application because it is not possible to write to individual bytes in
this register.

Maybe I have an old version of LPC2106 data sheet. But as you write 
it would be a usefull thing to write this register not just read.



Again back to the problem of RAM and Flash size:

I think most of the developpers using LPC21xx devices also would like 
to use RTOS. Beacuse in most of the problems which requires an 32 bit 
uc there are paralel things to do, and therefore we need threads (In 
most of the cases, where there is no need of threads a simple 8bit 
controller with price under $4 could do the job). And if I need 
threads I would like to use a complex operating system like eCos not 
just a kernel. The main advantage of the comlex operating system 
that, I can add additional packages (with a mouse click) like 
standard C IO, or Math functions, TCP/IP stack, File system, ... , to 
my application, and do not need to write it. This way makes the 
development shorter and easyer ( even in the garage :-) ). And the 
source code also become much more hardware independent.

For a good RTOS applications (probably with remote boot support) I 
would need a minimum of 128k Flash, and 64k of RAM, of course I would 
be very happy if I had 256/512k Flash and 64/128k RAM. I thing more 
memory is not required, because in that cases the developper should 
use external RAM/Flash and Linux, and WinCE.

Balázs