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新建 #179

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t113 无法通过pwm控制对应的背光节点

Added by 余 顺 over 2 years ago. Updated over 1 year ago.

Status:
新建
Priority:
普通
Assignee:
-
Category:
pwm
Target version:
t113 -buildroot
Start date:
01/07/2023
Due date:
% Done:

0%

Estimated time:

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

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clipboard-202301071641-8tc6b.png (11.8 KB) clipboard-202301071641-8tc6b.png 余 顺, 01/07/2023 07:32 AM
clipboard-202301071642-cyhqp.png (29.3 KB) clipboard-202301071642-cyhqp.png 余 顺, 01/07/2023 07:34 AM
clipboard-202307141031-rbyjs.png (40.3 KB) clipboard-202307141031-rbyjs.png 余 顺, 07/14/2023 01:13 AM
clipboard-202307141032-bcjcf.png (45 KB) clipboard-202307141032-bcjcf.png 余 顺, 07/14/2023 01:13 AM
clipboard-202307141032-rozrm.png (2.5 KB) clipboard-202307141032-rozrm.png 余 顺, 07/14/2023 01:14 AM
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 #1

Updated by 余 顺 over 1 year ago

测试指令

  1. echo 7 > /sys/class/pwm/pwmchip0/export
  2. echo 1000000 >/sys/class/pwm/pwmchip0/pwm7/period
  3. echo 500000 >/sys/class/pwm/pwmchip0/pwm7/duty_cycle
  4. 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

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