| # Copyright 2015 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| |
| class FunctionGenerator(object): |
| """ Abstract base class to define the interface for function generators """ |
| |
| SQUARE_WAVE = 'square_wave' |
| SIN_WAVE = 'sine_wave' |
| WAVEFORMS = [SQUARE_WAVE, SIN_WAVE] |
| |
| def __init__(self, device_path=None): |
| raise NotImplementedError('Error: __init__() not implemented.') |
| |
| def IsValid(self): |
| """ Return True if the object is set up and ready to use. """ |
| raise NotImplementedError('Error: IsValid() not implemented.') |
| |
| def Off(self): |
| """ Turn off the output of the function generator. """ |
| raise NotImplementedError('Error: Off() not implemented.') |
| |
| def GenerateFunction(self, form, frequency, amplitude): |
| """ Generate the specified wave on this function generator """ |
| raise NotImplementedError('Error: GenerateFunction() not implemented.') |
