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tm4c123fh6pm的定时器双边沿检测问题

Other Parts Discussed in Thread: TM4C123FH6PM

请问怎么获得tm4c123fh6pm的定时器双边沿检测的两个边沿之间的时间,还有怎么判断是上升沿还是下降沿呢,网上基本上没有这方面的问题,而且按照手册读取GPTMTnR这个寄存器的值,发现连续两次进入中断读取的值一样的,到底怎么检测的呢