fixed a few PWM bugs; thanks Carsten
fixed a few PWM bugs; thanks Carsten

ims-tyler/PyBBIO,graycatlabs/PyBBIO,ims-tyler/PyBBIO,ims-tyler/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,leftbrainstrain/PyBBIO,graycatlabs/PyBBIO,ims-tyler/PyBBIO,leftbrainstrain/PyBBIO,graycatlabs/PyBBIO,graycatlabs/PyBBIO,leftbrainstrain/PyBBIO,ims-tyler/PyBBIO,graycatlabs/PyBBIO