pub unsafe extern "C" fn PhidgetDCMotor_setOnBackEMFChangeHandler(
ch: PhidgetDCMotorHandle,
fptr: PhidgetDCMotor_OnBackEMFChangeCallback,
ctx: *mut c_void,
) -> PhidgetReturnCodepub unsafe extern "C" fn PhidgetDCMotor_setOnBackEMFChangeHandler(
ch: PhidgetDCMotorHandle,
fptr: PhidgetDCMotor_OnBackEMFChangeCallback,
ctx: *mut c_void,
) -> PhidgetReturnCode