RE: Custom GPIO pin in Overlay file

sathishraj — Thu, 05 May 2022 07:53:55 GMT

Thank you very much...its working. DT_ALIAS setting configured properly; then starts working. In Prj.conf , i have only this line CONFIG_GPIO=y.

when writing a pin,

dev = device_get_binding(LED1);

if (dev == NULL) {

return;

}

ret = gpio_pin_configure(dev, PIN1, GPIO_OUTPUT_ACTIVE | FLAGS);

if (ret < 0) {

return;

}

gpio_pin_set(dev, PIN1, 1);// when PIN=1; in the output voltage we get 0V, when PIN=0; we get 3.3Voltage in that

And also in reading a pin;

dev = device_get_binding(BUTT);

if (dev == NULL) {

return;

}

ret = gpio_pin_configure(dev, PIN2, GPIO_INPUT| FLAGS);

static int8_t readPinVal=0;

readPinVal = gpio_pin_get(dev, PIN2); // when PIN2 =0; We get readPinVal =1; and vice versa.

I do want in in reversal. How to do that.

HOW TO USE THIS:

arduino_header: connector {

compatible = "arduino-header-r3";

#gpio-cells = <2>;

gpio-map-mask = <0xffffffff 0xffffffc0>;

gpio-map-pass-thru = <0 0x3f>;

gpio-map = <0 0 &gpio0 3 0>, /* A0 */

<1 0 &gpio0 4 0>, /* A1 */

<2 0 &gpio0 28 0>, /* A2 */

in the overlay file, in-order to act this pin as input or output.

Jared — Mon, 02 May 2022 11:36:15 GMT

Hi,

Are you using a development kit?

How are you checking if the signal is toggling? Do you measure the voltage directly on the pin?

Can you try to use GPIO_ACTIVE_LOW instead 0 in the project config.

regards

Jared