Android Things Raspberry Pi GPIO最大频率是多少? [英] What is Android Things Raspberry Pi GPIO max frequency?
问题描述
在哪里可以找到Android下Raspberry Pi 3的GPIO端口的开关速度的特征，例如
Where can be found the characteristics of the switching speed of GPIO port for the Raspberry Pi 3 under Android Things like that?
推荐答案
In DP2 there is two ways to control GPIO:
1)和使用Java的SDK(由Harry Fairhead分析
1) with SDK using java (analyzed by Harry Fairhead here);
2)和使用C/C ++的NDK(由Harry Fairhead分析
2) with NDK using C/C++ (analyzed by Harry Fairhead here).
在使用Java的SDK时，看到的最快脉冲大约为0.23ms，并且脉冲序列中有很多大(最长8ms)中断(!!!).使用C/C ++的NDK时，脉冲宽度从0.23ms减小到大约0.15ms.
With SDK using java the fastest pulses seen are around 0.23ms and there are lots of large (up to 8ms) interruptions (!!!) in the pulse train. And with NDK using C/C++ the pulse width is reduced from 0.23ms to just around 0.15ms.
结论:Android Things DP2 Raspberry Pi GPIO的最大频率约为3 kHz，不足以编写与大多数不受支持的从盒子"协议接口的驱动程序.
Conclusion: Android Things DP2 Raspberry Pi GPIO max frequency is about 3 kHz, that is not fast enough to write drivers that interface to most not supported "from the box" protocols.
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