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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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此样例演示了在TIM1中使用DMA连续两次burst传输数据的功能，burst每传输一次更新三
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个寄存器，PSC,ARR,RCR，在更新事件中断中，LED会闪烁，通过逻辑分析仪监测，可看到
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LED的翻转间隔会从第一次的2s，第二次2s，第三次1s,第四次及后续变为0.5s，此时两次
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burst传输完成，并且PCS,ARR,RCR均更新完毕。
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Function descriptions:
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This sample demonstrates the function to transfer data in TIM1 using DMA in two
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consecutive bursts.burst updates three registers(PSC,ARR,RCR) per transfer.In
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the interruption of update event, LED will be blinked. Through the monitoring of
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logic analyzer, it can be seen that the flipping interval of LED will change
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from 2s for the first time, 2s for the second time, 1s for the third time, and
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0.5s for the fourth and subsequent times. At this time, the two burst
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transmission is completed, and PCS、ARR and RCR are all updated.
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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. 下载并运行程序
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2. 观察LED闪烁频率越来越快
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Example execution steps:
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1. compile and download the program to MCU and run it;
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2. Observe the LED flashing frequency getting faster and faster
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================================================================================
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注意事项：
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Notes:
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