Function SoapySDRDevice_readGPIO 

pub unsafe extern "C" fn SoapySDRDevice_readGPIO(
    device: *const SoapySDRDevice,
    bank: *const c_char,
) -> c_uint

Readback the value of a GPIO bank.

\param device a pointer to a device instance \param bank the name of an available bank \return an integer representing GPIO bits