OK3588-安卓系统添加pwm的可执行权限

2023-9-28 15:39| 发布者: whl| 查看: 139| 评论: 0

类目：知识库 > RK3588系列产品文档编号: 1154

安卓系统，/sys/class/pwm/目录下的节点需要使用root用户进行读写。写应用程序时没有可读写权限。可以使用如下方法修改其初始状态的可执行权限。

以pwm0和pwm2为例，在device/rockchip/common/rootdir/init.rk30board.rc文件中添加如下指令：

write /sys/class/pwm/pwmchip0/export 0

chown system system /sys/class/pwm/pwmchip0/pwm0/enable

chown system system /sys/class/pwm/pwmchip0/pwm0/polarity

chown system system /sys/class/pwm/pwmchip0/pwm0/period

chown system system /sys/class/pwm/pwmchip0/pwm0/duty_cycle

chmod 0666 /sys/class/pwm/pwmchip0/pwm0/enable

chmod 0666 /sys/class/pwm/pwmchip0/pwm0/polarity

chmod 0666 /sys/class/pwm/pwmchip0/pwm0/period

chmod 0666 /sys/class/pwm/pwmchip0/pwm0/duty_cycle

write /sys/class/pwm/pwmchip2/export 0

chown system system /sys/class/pwm/pwmchip2/pwm0/enable

chown system system /sys/class/pwm/pwmchip2/pwm0/polarity

chown system system /sys/class/pwm/pwmchip2/pwm0/period

chown system system /sys/class/pwm/pwmchip2/pwm0/duty_cycle

chmod 0666 /sys/class/pwm/pwmchip2/pwm0/enable

chmod 0666 /sys/class/pwm/pwmchip2/pwm0/polarity

chmod 0666 /sys/class/pwm/pwmchip2/pwm0/period

chmod 0666 /sys/class/pwm/pwmchip2/pwm0/duty_cycle

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