说明：  stm32f334c8t6开发板利用 HRTIM输出脉冲，实现呼吸灯功能。生成互补输出信号，掌握死区时间设置方法，学习主回路拓扑，加驱动信号，观察波形。测量不同脉宽下的输出电压。配置 ADC，通道扫描，DMA(circular mode)，HRTIM信号触发启动转换。配置 HRTIM输出事件信号，参考 ADC示例，校准，启动 ADC DMA，找到 DMA传输结束回调函数。加入断点，加 PI进行控制，调试。
(The stm32f334c8t6 development board uses hrtim output pulse to realize the function of breathing lamp. Generate complementary output signal, master dead time setting method, learn main circuit topology, add drive signal, and observe waveform. Measure the output voltage under different pulse width. Configure ADC, channel scan, DMA (circular mode), hrtim signal trigger to start conversion. Configure hrtim output event signal, refer to ADC example, calibrate, start ADC DMA, find DMA transfer end callback function. Add breakpoint, add PI for control and debugging.)