Lpc2000

Hello,

I have an urgent project on hands and need an advice on it's feasibility 
with LPV21xx.
I have pretty extensive experience with 8-bitters (Atmel etc.), but none 
with ARM.

I need:
1. Generate video sync signal for either NTSC or PAL. Since PAL frequency is 
higher, it's more critical.
    Crystal is 17.734MHz, so I can run CPU at  *3 = 53MHz.
    I don't see problems in generating vertical and horizontal synch 
signal - just counting.
    The problem is that it should synchronize to the external vertical synch 
signal - i.e. on external sync it should start the
    pattern over.
   As far as I understand, I can just use FIR interrupt, but how can I 
return from it to the certain program address?
   Can I just write it to the PC register at the exit from FIQ? Again, as 
far as I know the compiler (I am going to use
   Keil) will automatically handle return from interrupt. How do I override 
it and return to a specific address?
2. I need to generate an on-screen logo, which is stored in a flash as grey 
8-bit pattern (up to 256x256), so it can be
    reprogrammed on a fly.
    So on each line I need to output up to 256 successive bytes from flash 
to the port for a D/A converter.
   Is it possible to handle this transfer in 3 cycles (1 pixel, *3 clock)? 
How to do it more effectively?
   Is there a way to move a block of memory to the port?

I've chosen LPC2138 because of single power supply and sufficient flash 
size.
With smaller logo size I can probably use LPC2132, or 2105 with dual power 
supply. Any advice on a choice.

Thanks a lot for any advice,
Gennady

--- In lpc2000@yahoogroups.com, "Gennady Palitsky" <gennadyp@j...> 
wrote:
...
>    As far as I understand, I can just use FIR interrupt, but how 
can I 
> return from it to the certain program address?
>    Can I just write it to the PC register at the exit from FIQ? 
Again, as 
> far as I know the compiler (I am going to use
>    Keil) will automatically handle return from interrupt. How do I 
override 
> it and return to a specific address?

you can look here :
http://www.hitex.co.uk/arm/lpc2000book/index.html
that's a beginning book from Hitex on LPC21xx and there are many 
good infos and tutorials for a beginner (like me) with ARM.. and you 
can see some on interrupt. there's a free downloadable version. 
the examples are made with Keil software and a part are also made 
with GNU tools..