1、功能说明
    1、TIM1 一个周期后同时改变周期和占空比
2、使用环境
    软件开发环境：  KEIL MDK-ARM 5.34.0.0
    硬件环境：      基于N32A455VEL7_EVB v1.0.0开发
3、使用说明
    系统配置；
        1、时钟源：
                    HSE=8M,PLL=144M,AHB=144M,APB1=36M,APB2=72M,TIM1 CLK=144M,DMA CLK=144M
        2、端口配置：
                    PA8选择为TIM1 CH1输出
        3、TIM：
                    TIM1 CH1 输出，周期触发DMA burst传输，加载AR,REPCNT,CCDAT1寄存器，改变占空比和周期和重复计数器
        4、DMA：
                    DMA1_CH5通道正常模式搬运3个半字SRC_Buffer[3]变量到TIM1 DMA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 CH1的波形
        2、TIM1的第一个周期结束后，后面的波形为DMA搬运的改变周期和占空比的波形
4、注意事项
    无



1. Function description
     1. Change the period and duty cycle at the same time after one cycle of TIM1
2. Use environment
     Software development environment: KEIL MDK-ARM 5.34.0.0
     Hardware Environment: Developed based on N32A455VEL7_EVB v1.0.0
3. Instructions for use
     System Configuration;
         1. Clock source:
                     HSE=8M,PLL=144M,AHB=144M,APB1=36M,APB2=72M,TIM1 CLK=144M,DMA CLK=144M
         2. Port configuration:
                     PA8 is selected as TIM1 CH1 output
         3. TIM:
                     TIM1 CH1 output, period trigger DMA burst transfer, load AR, REPCNT, CCDAT1 registers, change duty cycle and period and repeat counter
         4. DMA:
                     DMA1_CH5 channel normal mode transfers 3 half-word SRC_Buffer[3] variables to TIM1 DMA register
     Instructions:
         1. Open the debug mode after compiling, and observe the waveform of TIM1 CH1 with an oscilloscope or logic analyzer
         2. After the first cycle of TIM1 ends, the following waveforms are the waveforms of the change cycle and duty cycle of DMA transfer
4. Matters needing attention
     none