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 "FreeRTOS.h" 29 #include "sensorhub/rt_timer.h" 30 #include "task.h" 31 32 #ifdef __cplusplus 33 } // extern "C" 34 #endif 35 36 namespace chre { 37 38 class SystemTimerBase { 39 protected: 40 /** Stack size (in words) of the timer callback runner task */ 41 static constexpr uint32_t kStackDepthWords = 0x200; // 2K stack size 42 43 /** Priority of the callback runner task */ 44 #ifdef PRI_CHRE_SYS_TIMER 45 static constexpr UBaseType_t kTaskPriority = PRI_CHRE_SYS_TIMER; 46 #else 47 static constexpr UBaseType_t kTaskPriority = tskIDLE_PRIORITY + 4; 48 #endif 49 50 /** Name of the callback runner task */ 51 static constexpr char kTaskName[] = "ChreTimerCbRunner"; 52 53 /** 54 * Callback function woken up by the timer, which in turn wakes up the 55 * callback runner task 56 */ 57 static void rtTimerCallback(struct rt_timer *timer); 58 59 /** 60 * The callback runner task that blocks until it gets woken up by the timer 61 * callback. 62 * 63 * This task runs the actual callback set by the user as the timer callback is 64 * running from the ISR. 65 * 66 * @param context a raw pointer that will be casted to a pointer to 67 * SystemTimer. 68 */ 69 70 static void callbackRunner(void *context); 71 72 /** A FreeRTOS task handle holding the callback runner task */ 73 TaskHandle_t mCallbackRunnerHandle = nullptr; 74 75 /** Tracks whether the timer has been initialized correctly. */ 76 bool mInitialized = false; 77 78 /** The properties of the timer including callback, data, etc. */ 79 struct rt_timer rtSystemTimer; 80 }; 81 } // namespace chre 82 #endif // CHRE_PLATFORM_TINYSYS_SYSTEM_TIMER_BASE_H_ 83