Lpc2000

Em Qua 31 Mai 2006 09:43, suyash escreveu:
> Hi all,
>
> I am using ARM LPC2106, I have following doubts about the
> configuration of PINSEL0 and PINSEL1.
>
> 1)where exactly should I define it in the initialsation?
>  In common system initialisation or at the eac and every periphral
> (ex. UART0 or SPI etc.) initialisation.

You can reconfigure anytime. For example, I first define all the pins as 
GPIOs, then next I define the GPIO that will be outputs. Then, in the routine 
that configures the UARTs, I change the pins from GPIOs to UART. But you can 
do it all in one time...

> 2) suppose I want to use a single pin as multipurpose functioning, so
> how do I have to take care of PINSELn.
> will it be always overwritten everytime or else we need to mask it
> and then modify it(for retaining its previous status).

All time you write a 32 bits word in the PINSELs, they will change, so you 
have to mask them.