|  | // Copyright 2024 The Pigweed Authors | 
|  | // | 
|  | // Licensed under the Apache License, Version 2.0 (the "License"); you may not | 
|  | // use this file except in compliance with the License. You may obtain a copy of | 
|  | // the License at | 
|  | // | 
|  | //     https://www.apache.org/licenses/LICENSE-2.0 | 
|  | // | 
|  | // Unless required by applicable law or agreed to in writing, software | 
|  | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | 
|  | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the | 
|  | // License for the specific language governing permissions and limitations under | 
|  | // the License. | 
|  | #pragma once | 
|  |  | 
|  | #include "pw_digital_io/digital_io.h" | 
|  |  | 
|  | // The functions in this file return specific implementations of singleton types | 
|  | // provided by the system. | 
|  |  | 
|  | namespace demo::system { | 
|  |  | 
|  | /// Initializes the system. This must be called before anything else in `main`. | 
|  | void Init(); | 
|  |  | 
|  | /// Starts the main system scheduler. This function never returns. | 
|  | [[noreturn]] void Start(); | 
|  |  | 
|  | pw::digital_io::DigitalInOut& MonochromeLed(); | 
|  |  | 
|  | }  // namespace demo::system |