sama5d3 开入测试

最新推荐文章于 2020-05-19 15:23:56 发布

转载最新推荐文章于 2020-05-19 15:23:56 发布 · 70 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/zym0805/p/4835712.html

本文展示了在嵌入式Linux环境下配置GPIO接口的过程。通过使用echo命令将GPIO编号导出到/sys/class/gpio/export，并设置为输入方向，最后读取GPIO的状态值。此过程适用于多个GPIO引脚。

root@sama5d3-linux:~ echo 20 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 16 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 12 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 10 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 14 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 4 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 2 > /sys/class/gpio/export
root@sama5d3-linux:~ echo 0 > /sys/class/gpio/export
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA20/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA16/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA12/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA10/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA14/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA4/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA2/direction
root@sama5d3-linux:~ echo in > /sys/class/gpio/pioA0/direction
root@sama5d3-linux:~ cat /sys/gpio/pioA20/value
cat: can't open '/sys/gpio/pioA20/value': No such file or directory
root@sama5d3-linux:~ cat /sys/class/gpio/pioA20/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA16/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA12/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA10/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA14/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA4/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA2/value
1
root@sama5d3-linux:~ cat /sys/class/gpio/pioA0/value
1