thank you for your answer, but this it is if I have an external pull-down
resistor, I want the software to activate a pull-down on the entrance, I
don't have external resistor.
thanks
2013/4/23 Tomaž Šolc <[email protected]>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 04/23/2013 11:31 AM, j m wrote:
> > Hello, I use libopencm3 with f1 stm32 for paparazzi autopilot
> > (luftboot). I would like to force a pull-down resistor on PIN PA9.
> >
> > I wanted to know how. If possible directly in libopencm3 file
> > (gpio.h) for example, or in the luftboot.c file where I call
> > libopencm3 ?
>
> You should add the following to the part of your code that initializes
> GPIOs:
>
> gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO9);
> gpio_clear(GPIOA, GPIO9);
>
> Best regards
> Tomaž
>
> - --
> Tomaž Šolc, research assistant
> SensorLab, Jožef Stefan Institute
> http://sensorlab.ijs.si
> mail: [email protected]
> blog: http://www.tablix.org/~avian/blog
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