GPIO Voltage Level Control

[BjoernS]

Hi everyone,

I would like to change the output voltage and current driver strength of some GPIO ports on the nRF52840. I am using the zephyr driver "gpio.h" API, but the "GPIO_VOLTAGE_3P3" flag is not known by the compiler when using the gpio_pin_configure() command. Currently, the GPIO has an output voltage of 1.8V for some reason, but I would like to have approx. 3.3V.

Maybe, someone could help me out here.

Regards,

Bjoern

[ketiljo]

That's not possible, the GPIO voltage always follows VDD on all nRF devices. 

The voltage flags are a Zephyr specific extension of the standard GPIO flags specified by the Linux GPIO binding. Only applicable if SoC allows to configure pin voltage per individual pin.