Lpc2000

Teera,

I am using almost all the GPIO pins on my LPC2106
board for driving CS8900A (at high speed). When doing
this exercise I learnt an important thing about P0.16
-- this behaves very differently, the switching timing
are very slow -- other pins are ok.

Set the appropriate PINSEL & IODIR bits, probe the
pins using an Oscilloscope & do this (you will see it
yourself),

while(1)
{
IOCLR = 0xffffffff
IOSET = 0xaaaaaaaa
IOCLR = 0xffffffff
IOSET = 0x55555555
}


Cheers,
-Mike.

--- tphatrapornnant <tp35@...> wrote:

> Hi all,
> 
> I'm using Ashling EVBA7 Philips LPC2100 Evaluation
> board (LPC2106). I 
> got a problem about using GPIO P0.16-P0.31 as
> general input/output. I 
> set some of these pins (P0.16-P0.31) as I did on
> P0.0-P0.15 pins which 
> all were used and worked correctly. For P0.16-P0.31,
> it didn't work. I 
> set pins to be output as the following:
> 
> PINSEL0 &= ~P15;
> IODIR |= P15;
> IOSET = P15; 
> 
> PINSEL1 &= ~P26;
> IODIR |= P26;
> IOSET = P26;   
> 
> Both pins worked correctly on Keil simulator (I
> toggled both pins 
> with '1' and '0' in while loop) but only P0.15 could
> toggle on the 
> real H/W.
> 
> Did I forget somethings? Does anyone have a clue?
> 
> Thanks,
> 
> Teera.
> 
> 
> 
> 
> 



	
		
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