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gpio模拟串口
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已结题
模拟波特率为9600的串口，1位起始位，8位数据位和1位停止位。为什么经常读不到起始位和停止位
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用逻辑分析仪抓波形看看，是否是你发送端写的时序不合乎要求。一般与接收端没有关系
逻辑分析仪抓到的波形是正确的，但是在驱动里每10微妙读一次电平的时候，发现低电平有时候维持不了20微妙，按波特率来算应该有104微秒左右。
那就是你写的模拟读串口的代码有问题。先用定时器定时处理一个拉高拉低的GPIO，看看是否能满足9600波特率下位宽的要求，在这个前提下，再在定时器处理回调函数里去处理读RX的代码。
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gpio中断+ 定时
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驱动是这样写的，现在发现进中断的数量不对，差很多，所以才有这个问题的。
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内核需要配置什么吗，这样操作。我就打开了高精度定时器就没发现还需要配置什么了。
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或将文件直接拖到这里
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