1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef CHRE_PLATFORM_TINYSYS_SYSTEM_TIMER_BASE_H_ 18 #define CHRE_PLATFORM_TINYSYS_SYSTEM_TIMER_BASE_H_ 19 20 #include <cinttypes> 21 #include <csignal> 22 #include <ctime> 23 24 #ifdef __cplusplus 25 extern "C" { 26 #endif 27 28 #include "sensorhub/rt_timer.h" 29 #include "task.h" 30 31 #ifdef __cplusplus 32 } // extern "C" 33 #endif 34 35 namespace chre { 36 37 class SystemTimerBase { 38 protected: 39 /** Stack size (in words) of the timer callback runner task */ 40 static constexpr uint32_t kStackDepthWords = 0x200; // 2K stack size 41 42 /** Priority of the callback runner task */ 43 static constexpr UBaseType_t kTaskPriority = tskIDLE_PRIORITY + 4; 44 45 /** Name of the callback runner task */ 46 static constexpr char kTaskName[] = "ChreTimerCbRunner"; 47 48 /** 49 * Callback function woken up by the timer, which in turn wakes up the 50 * callback runner task 51 */ 52 static void rtTimerCallback(struct rt_timer *timer); 53 54 /** 55 * The callback runner task that blocks until it gets woken up by the timer 56 * callback. 57 * 58 * This task runs the actual callback set by the user as the timer callback is 59 * running from the ISR. 60 * 61 * @param context a raw pointer that will be casted to a pointer to 62 * SystemTimer. 63 */ 64 65 static void callbackRunner(void *context); 66 67 /** A FreeRTOS task handle holding the callback runner task */ 68 TaskHandle_t mCallbackRunnerHandle = nullptr; 69 70 /** Tracks whether the timer has been initialized correctly. */ 71 bool mInitialized = false; 72 73 /** The properties of the timer including callback, data, etc. */ 74 struct rt_timer rtSystemTimer; 75 }; 76 } // namespace chre 77 #endif // CHRE_PLATFORM_TINYSYS_SYSTEM_TIMER_BASE_H_