1、功能说明
    1、TIM3 TIM4在TIM1周期下计数
2、使用环境
    软件开发环境：  KEIL MDK-ARM V5.34.0.0
    硬件环境：      基于N32G430C8L7_STB V1.0开发
3、使用说明
    系统配置；
        1、时钟源：
                    HSE=8M,PLL=128M,AHB=128M,APB1=32M,APB2=32M,TIM1 CLK=64M,TIM3 CLK=64M,TIM4 CLK=64M                      
        2、端口配置：
                    PA6选择为TIM3的CH1输出
                    PB6选择为TIM4的CH1输出
                    PA8选择为TIM1的CH1输出                  
        3、TIM：
                    TIM1 CH1 周期触发TIM3 TIM4的门控             
    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、TIM3 CH1、TIM4 CH1的波形
        2、程序运行后，TIM3 15倍周期TIM1，TIM4 10倍周期TIM1
4、注意事项
     默认情况下，开发板的PA9和PA10跳线帽连接到NSLINK的虚拟串行端口。如果PA9和PA10未用作项目中的串行端口，而是用于其他用途，则必须拔掉串行端口跳线帽。



1. Function description
     1. TIM3 TIM4 counts under TIM1 cycle
2. Development environment
     Software development environment: KEIL MDK-ARM V5.34.0.0
     Hardware environment: Developed based on N32G430C8L7_STB V1.0
3. How to use
     System Configuration;
         1. Clock source:
                     HSE=8M,PLL=128M,AHB=128M,APB1=32M,APB2=32M,TIM1 CLK=64M,TIM3 CLK=64M,TIM4 CLK=64M
         2. Port configuration:
                     PA6 is selected as CH1 output of TIM3
                     PB6 is selected as CH1 output of TIM4
                     PA8 is selected as CH1 output of TIM1
         3. TIM:
                     TIM1 CH1 cycle triggers TIM3 TIM4 gate
     Instructions:
         1. Open the debug mode after compiling, and observe the waveforms of TIM1 CH1, TIM3 CH1, TIM4 CH1 with an oscilloscope or logic analyzer
         2. After the program runs, TIM3 15 times the period TIM1, TIM4 10 times the period TIM1
4. Attention
        By default, the PA9 and PA10 jumper caps of the development board are connected to the virtual serial port of NSLINK. If PA9 and PA10 are not used as serial ports in the project, and are used for other purposes, the serial port jumper caps must be unplugged.