汽车VCU控制器测试工装的程序，STM32单片机扩展总线读写FPGA内部RAM，DDS方式产生PWM，PWM频率，脉宽测量功能(Automotive VCU controller test tooling procedures, STM32 microcontroller expansion bus read and write FPGA, the internal RAM, DDS way to generate PWM, PWM frequency, pulse width measurem