完成 #179
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Added by 余 顺 over 3 years ago.
Updated about 1 month ago.
Description
版型:rp-t113
系统:buildroot
需求:通过背光节点控制对应的屏幕亮度
测试现象:屏幕能点亮亮的,使用pwm7 进行亮度调节,配置后有pwm信号输出
sdk 修改pwm7的节点为打开的状态也无法控制,

调试串口打印如下

Files
测试指令
- echo 7 > /sys/class/pwm/pwmchip0/export
- echo 1000000 >/sys/class/pwm/pwmchip0/pwm7/period
- echo 500000 >/sys/class/pwm/pwmchip0/pwm7/duty_cycle
- echo 1 > /sys/class/pwm/pwmchip0/pwm7/enable
内核修改 打开 pwm 7

修改内核调用的屏参 ,释放pwm7 节点

若没有释放则会报繁忙的错误

- Tracker changed from 新建 to 完成
- Status changed from 新建 to 完成
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