can't toggle P2[0..7] of LPC1768 using mbed library

[mostafanfs]

Hi guys. I've been trying to use mbed library on my LPC1768 board (it's a LandTiger board actually). In this board there are 8 LEDs connected to P2.0 ~ P2.7 and when I try to toggle one of them it wont work at all. Here's the code:

#include "mbed.h"

DigitalOut myled(P2_0);

int main(void) {
	while(1){
	myled = 1;
	wait_ms(1000);
	myled = 0;
	wait_ms(1000);
	}
}

As you can see it's a simple toggle program. What is strange is that it works inside Keil debugger and I can see that P2.0 is toggling.
What's even more strange is that the program will work fine on the board for all the other Ports besides P2[7..0] (even for P2.8 ~ P2.13 will work fine!) so it's not a problem with clock or start-up code or anything else.
So do we have any thoughts? Why am I getting this strange behavior ?

 

[milan.rajik]

I have not use LPC controllers but maybe the pins on which LEDs doesn't turn ON are open drain type. Put a pullup resistor and see.

 

[mostafanfs]

Thank you. Well I checked and turned out that DigitalOut class does put the GPIO pin mode in No pull-up/down mode and it's ok considering it works fine for all GPIOs besides P2[7..0] . Anyway just to be sure I tried to put a pull-up internally for P2.0 by changing PINMODE register (setting it as Pull-up enabled) inside main function and it didn't work again.
It's ridiculous. I'm going out of my mind!
Does anybody have a LPC1768 mbed board? I really appreciate it if someone tested above example on their mbed board ...

 

[mostafanfs]

Any help ?