Reply by vipu...@yahoo.co.in January 28, 20082008-01-28
Thanks Alex

I solve my problem...........thanks Group
Hi all,
>
>I am using LPC2101 for my application in which i have to use P0.0 to P0.3. And here is the code just for testing these pins.
>
> PINSEL0 = 0; // Make all pins GPIO function
> IODIR = 0x0F; // Make P0.0-P1.3 as output
> while(1)
> {
> if(flag==0)
> {
> IOSET = 0X0F;
> flag=1;
> }
> else
> {
> IOCLR = 0X0F;
> flag=0;
> }
> Delay(100);
> }
>
>But same time only P0.1 and P0.0 are toggling other two pins remain uneffected. so i can not understand the problem.......this also happen with other few pin on LPC2101
>
>So can anybody help.......Thanks in advance
>
>Thanks and Regards,
> Vipul Patel
>
>---------------------------------
> Save all your chat conversations. Find them online.
>
>

An Engineer's Guide to the LPC2100 Series

Reply by al_b...@vp.pl January 28, 20082008-01-28
l... napisa(a):

Hi all,

I am using LPC2101 for my application in which i have to use P0.0 to
P0.3. And here is the code just for testing these pins.

PINSEL0 = 0; // Make all pins GPIO function
IODIR = 0x0F; // Make P0.0-P1.3 as output
while(1)
{
if(flag==0)
{
IOSET = 0X0F;
flag=1;
}
else
{
IOCLR = 0X0F;
flag=0;
}
Delay(100);
}

But same time only P0.1 and P0.0 are toggling other two pins remain
uneffected. so i can not understand the problem.......this also happen
with other few pin on LPC2101

P0.2 and P0.3 are open drain pins. Try connect pullups.
Albert





Reply by Alex Svetek January 28, 20082008-01-28
PATEL VIPUL wrote:
> But same time only P0.1 and P0.0 are toggling other two pins remain uneffected. so i can not understand the problem.......this also happen with other few pin on LPC2101
>
P0.2, 3, 17 and 18 have open-collector outputs. You have to add pull-up
resistors to have them toggle between high and low pin state.
Those pins are also meant for I2C communication which requires OC outputs.

Alex
Reply by PATEL VIPUL January 28, 20082008-01-28
Hi all,

I am using LPC2101 for my application in which i have to use P0.0 to P0.3. And here is the code just for testing these pins.

PINSEL0 = 0; // Make all pins GPIO function
IODIR = 0x0F; // Make P0.0-P1.3 as output
while(1)
{
if(flag==0)
{
IOSET = 0X0F;
flag=1;
}
else
{
IOCLR = 0X0F;
flag=0;
}
Delay(100);
}

But same time only P0.1 and P0.0 are toggling other two pins remain uneffected. so i can not understand the problem.......this also happen with other few pin on LPC2101

So can anybody help.......Thanks in advance

Thanks and Regards,
Vipul Patel

---------------------------------
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