I have a Raspberry Pi 2 Model B. When I power it, with nothing connected to the GPIO pins and the OS still not booted (probably, I checked right after plugging it to the power) some of the pins show HIGH. I'm using the wiringPi library. Here's what
gpio readall prints:
And when I set some of the pins that read HIGH to output mode, the voltage drops down to 0V. If I then change it's mode back to input, the voltage jumps up to 3.3V(HIGH). The input impedance is about 165 Ohms while the pin is configured as input (It sources 2mA when shorted to ground).
Is this Raspberry Pi's normal behavior or there's something wrong with my rpi. Shouldn't all pins when the rpi is freshly started read 0?