Lpc2000

The I2C SDA and SCL are on those pins.
It seems disabling the I2C (default) doesn't provide push-pull
instead of opendrain as needed by I2C

-- Kris



Hi,

I have a similar problem. I want to use p0.2 and p0.3 as standard GPIO
Output Pins.
For this use I need a Pull up resistor.

If I use another Pin like P0.30 the level not changes on wire, not with
pull up not with pull down and not without anything.
What can be wrong?

Here is my code: I think it's not the Problem, I hope

    REG(PCB_PINSEL1) &= ~(0xF0000000);
    REG(PCB_PINSEL0) &= ~(0xF0);
    REG(GPIO_IODIR) |= 0xC00000C; //Output direction for P0.30/31/2/3
    REG(GPIO_IOCLR) |= 0xC00000C; //Set Port P0.30/31/2/3 low
//P0.2/3 OK with Pull-up
    REG(GPIO_IOSET) |= 0xC00000C; //Set Port P0.30/31/2/3 high
//P0.2/3 OK with Pull-up
    b_sleep(0xffff);
    REG(GPIO_IOCLR) |= 0xC00000C; //Set Port P0.30/31/2/3 low
//P0.2/3 OK with Pull-up


Regards, S\ufffdren



--- In lpc2100@yahoogroups.com, "Thomas Weber" <weber@c...> wrote:
> Could it be, that i have to pull-up all gpio-pins, i want use?
>
> I have a pull-down on a gpio-pin, because the wire is normally on
low, but
> the wire is never on a high  level.
>
> Thomas

Hello Thomas,

i have noticed that the GPIOs of the LPC2106 on my self-made test-
board after a reset or when they are in input mode have a level of 2
volt. They must be pulled with a resistor (<5k) to reach the desired
low or high state. In output mode everything is ok. Is this correct?

Mathew




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