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临时做的一个简易的频率计

基于NUCLEO-G070RB板子,PA0(A0)作为输入口

每次上升沿进入中断计数+1,记录半秒钟脉冲数量后串口回传2倍数值作为测得的频率

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a frequency meter made of STM32 MCU

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