说明：  STM32 高级定时器TIM1 输出PWM展波，可调节占空比，亲测可用，用示波器接GPIOA10引脚查看波形
(STM32 advanced timer TIM1 outputs PWM spread wave, which can adjust duty cycle and can be used for personal measurement. GPIOA10 pin is connected to oscilloscope to view waveform.)