Nordic evaluation board IO pin: cannot be set to high level

[abcdcadb]

I wrote a pulse generation application on pin of nordic evaluation board to communicate from a sensor (according to the manual of that sensor)

however, there is s a step that the pin could not be high even it is set high in code by "nrf_gpio_cfg_output(30) and nrf_gpio_pin_set(30)" while the others are normal

and of course, i couldnt read from sensor as well as I want

So my question is there any possibility this caused by either Nodric (IO configuration) or by response of the senso. on that pin?

any idea or hypothesis, is welcome.

I attached the image extracted from scope, it is a little higher than zero level but still is lower than high level. The edge is circled is the issue

 

[Vidar Berg]

Hello, is it possible that the output is being driven low by the sensor, or is it a high impedance input? You may try to configure the ouput with high drive to see if that helps, see GPIO->PIN_CNF[] register in nRF51 RM for more details.