1、功能说明
    1、TIM1 CH3 CH3N互补信号每6个周期改变一次占空比
2、使用环境
    软件开发环境：  KEIL MDK-ARM V5.26.2.0
    硬件环境：      基于N32L43XML-STB_V1.0开发
3、使用说明
    系统配置；
        1、时钟源：
            HSE=8M,PLL=108M,AHB=108M,APB1=27M,APB2=54M,TIM1 CLK=108M,DMA CLK=108M
        2、端口配置：
            PA10选择为TIM1 CH3输出
            PB15选择为TIM1 CH3N输出
        3、TIM：
            TIM1 CH3 CH3N互补输出，每6个周期触发一次DMA传输
        4、DMA：
            DMA1_CH5通道循环模式搬运3个半字SRC_Buffer[3]变量到TIM1 CC3寄存器
    使用方法：
        1、编译后打开调试模式，用示波器或者逻辑分析仪观察TIM1 CH3 CH3N的波形
        2、TIM1的6个周期改变一次CH3 CH3N的占空比，循环改变
4、注意事项
    无

1. Function description
     1. TIM1 CH3 CH3N complementary signal changes the duty cycle every 6 cycles
2. Use environment
     Software development environment: KEIL MDK-ARM V5.26.2.0
     Hardware environment: Developed based on N32L43XML-STB_V1.0
3. Instructions for use
     System Configuration;
         1. Clock source:
             HSE=8M, PLL=108M, AHB=108M, APB1=27M, APB2=54M, TIM1 CLK=108M, DMA CLK=108M
         2. Port configuration:
             PA10 is selected as TIM1 CH3 output
             PB15 is selected as TIM1 CH3N output
         3. TIM:
             TIM1 CH3 CH3N complementary output, trigger a DMA transfer every 6 cycles
         4. DMA:
             DMA1_CH5 channel circular mode transfers 3 half-word SRC_Buffer[3] variables to the TIM1 CC3 register
     Instructions:
         1. After compiling, turn on the debug mode, use an oscilloscope or logic analyzer to observe the waveform of TIM1 CH3 CH3N
         2. Change the duty cycle of CH3 and CH3N once in 6 cycles of TIM1, and change cyclically
4. Matters needing attention
     without