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================================================================================
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样例使用说明
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Sample Description
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================================================================================
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功能描述：
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此样例演示了FreeRTOS信号量的相关API函数，实现二值信号量、计数型信号量和互斥信号
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量三种信号量实验，通过串口log，观察三种信号量的实现过程。
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Function descriptions:
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This sample demonstrates the relevant API functions of FreeRTOS signals to
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implement three kinds of signaling experiments: binary signals, counting-type
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signals and mutually exclusive signals, and observes the implementation process
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of the three kinds of signals through the serial port log.
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================================================================================
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测试环境：
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测试用板：PY32F403_STK
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MDK版本：5.28
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IAR版本：9.20
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GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10
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Test environment:
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Test board: PY32F403_STK
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MDK Version: 5.28
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IAR Version: 9.20
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GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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================================================================================
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使用步骤：
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1. 编译下载程序到MCU，并运行；
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2. 通过串口调试助手打印的log信息，观察任务执行过程。
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3. 打开宏定义SEMAPHORE_BINRAY，关闭SEMAPHORE_COUNT和SEMAPHORE_MUTEX。
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Task1: 任务每隔2s释放一次二值信号量。
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Task2: 获取二值信号量，打印获取成功信息。获取失败则进入等待状态。
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Task3: 删除任务3。
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4. 打开宏定义SEMAPHORE_COUNT，关闭SEMAPHORE_BINRAY和SEMAPHORE_MUTEX。
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Task1: 任务每隔2s释放一次计数型信号量。信号量总数加1。总数上限是50。
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Task2: 获取计数型信号量，打印获取成功信息。信号量总数减1。
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Task3: 删除任务3。
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5. 打开宏定义SEMAPHORE_MUTEX，关闭SEMAPHORE_BINRAY和SEMAPHORE_COUNT。
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Task1: 任务每隔4s(3s delay延时 + 1s阻塞延时)获取和释放互斥信号量。
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Task2: 打印任务2运行log。
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Task3: 任务每隔1.5s(0.5s delay延时 + 1s阻塞延时)获取和释放互斥信号量。
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步骤5：是为了验证实现互斥信号量优先级继承功能。
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Example execution steps:
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1. Compile and download the program to the MCU and run it;
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2. You can use the log information printed by the serial debugging assistant to
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observe the task execution process.
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3. Open the define SEMAPHORE_BINRAY, close SEMAPHORE_COUNT and SEMAPHORE_MUTEX.
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Task1: The task releases a binary semaphore every 2s.
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Task2: Get a binary semaphore and print a success message. If the acquisition
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fails, the system enters the waiting state.
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Task3: Delete Task 3.
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4. Open the define SEMAPHORE_COUNT, close SEMAPHORE_BINRAY and SEMAPHORE_MUTEX.
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Task1: The task releases a counting semaphore every 2s. Add 1 to the total
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number of semaphores. The total number is capped at 50.
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Task2: Obtain the counting semaphore and print the obtaining success message.
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Subtract 1 from the total semaphore.
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Task3: Delete Task 3.
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5. Open the define SEMAPHORE_MUTEX, close SEMAPHORE_BINRAY and SEMAPHORE_COUNT.
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Task1: The task obtains and releases mutually exclusive semaphore every 4s
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(3s delay + 1s blocking delay).
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Task2: Print Task 2 Run log.
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Task3: The task acquires and releases mutually exclusive semaphore every
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1.5s(0.5s delay + 1s blocking delay).
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Step 5: Is to verify the implementation of the MUtex priority inheritance
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function.
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================================================================================
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注意事项：
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STK板与USB转TTL模块的连线方式如下：
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STK板 USB转TTL模块
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PA02(TX) --> RX
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PA03(RX) --> TX
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GND --> GND
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波特率: 115200bps
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Notes:
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The STK board is wired to the USB to TTL module as follows:
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STK board USB to TTL module
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PA02(TX) --> RX
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PA03(RX) --> TX
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GND --> GND
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Baud rate: 115200bps
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================================================================================
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