PIN脚功能切换

[SZB]

大家好:

     我现在遇到一个问题，我的工程是用超声波测量距离，当超声波信号线对地短路或对电源短路时，信号线会被拉高或拉低。我现在用FTM模块来捕捉信号变化计算距离。当短路时FTM将不会触发中断（边沿触发），现在我想将FTM的信号PIN（PTB2）初始化为GPIO来捕捉信号来判断异常，但是失败了，GPIO功能无法使用，这里面是不是有什么注意的地方

已经调用FTM_DRV_DeinitInputCapture(),FTM_DRV_Deinit()。

非常感谢大家回答！

[SZB]

Hi Robin_Shen,

PTB2 is used as an input to FTM,. however,when PTB2 is converted to GPIO,I can't read the IO state.

[Robin_Shen]

Hi SZB,

PINS_DRV_ReadPins(PTB);无法返回正确值吗？

根据提示只要该引脚的方向是输入即可获取正确的值。查（Port Data Direction Register (PDDR)）寄存器。

当然还要确保PTB口的时钟门是开启的，查PCC PORTB Register (PCC_PORTB)寄存器。

Best Regards,
Robin

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[SZB]

Hi Robin_Shen,

PTB2 is used as an input to FTM,. however,when PTB2 is converted to GPIO,I can't read the IO state.

[Robin_Shen · Accepted solution]

Please read the value of PTB directly without modify it as GPIO. You can also confirm it during debug by Port Data Input Register (PDIR).