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delay
- 利用stm32f407作为测试板,作用为利用TIM3定时器和中断服务来进行精确的延时,进过测试可以精确到3us,如果延时时间小于3us会造成比较大的误差。-Stm32f407 use as a test board, the role for the use of TIM3 timer and interrupt service to perform accurate delay, been to test can be accurate to 3us, if the delay time is