求助，君正X1000 如何调试 pwm蜂鸣器？

550590567@qq.com · 2018-07-04 10:41:06

君正X1000 PWM4蜂鸣器该如何调试？
我kernel配置如下：
Device Drivers --->
Input device support --->

Miscellaneous devices --->
PWM beeper support (NEW)

->Device Drivers
-> Pulse-Width Modulation (PWM) Support (PWM [=y])
--- Pulse-Width Modulation (PWM) Support

JZPWM support for LED or Beeper drivers
JZ PWM driver
JZ PWM function pinselect
GPIO Port pwm0
GPIO Port pwm4

应用上需要什么操作？大神们方便帮忙看下，非常感谢！

晕哥 · 2018-07-04 10:53:54

开始以为君正的 x1000 开发手册上有，Halley2_kernel3_10-develepment.pdf

结果发现并没有讲得很详细。

晕哥 · 2018-07-04 10:54:32

后来一搜，这位网友讲得非常详细

君正X系列开发11---pwm配置、分析
https://blog.csdn.net/cyf15238622067/article/details/80215345

如果pwm驱动蜂鸣器，配置
Device Drivers --->
Input device support --->
[ *] Miscellaneous devices --->
< * > PWM beeper support (NEW)

操作如下:

#
echo timer > /sys/class/leds/leds_pwm4/trigger
echo none > /sys/class/leds/leds_pwm4/trigger
echo 255 > /sys/class/leds/leds_pwm4/trigger
sh: write error: Invalid argument
echo 255 > /sys/class/leds/leds_pwm4/brightness
echo 0 > /sys/class/leds/leds_pwm4/brightness
echo 255 > /sys/class/leds/leds_pwm4/brightness
echo 0 > /sys/class/leds/leds_pwm4/brightness
echo 255 > /sys/class/leds/leds_pwm4/brightness
echo 0 > /sys/class/leds/leds_pwm4/brightness

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楼主 #1 2018-07-04 10:41:06 分享评论

求助，君正X1000 如何调试 pwm蜂鸣器？

#2 2018-07-04 10:53:54 分享评论

Re: 求助，君正X1000 如何调试 pwm蜂鸣器？

#3 2018-07-04 10:54:32 分享评论

Re: 求助，君正X1000 如何调试 pwm蜂鸣器？

echo timer > /sys/class/leds/leds_pwm4/trigger

echo none > /sys/class/leds/leds_pwm4/trigger

echo 255 > /sys/class/leds/leds_pwm4/trigger

echo 255 > /sys/class/leds/leds_pwm4/brightness

echo 0 > /sys/class/leds/leds_pwm4/brightness

echo 255 > /sys/class/leds/leds_pwm4/brightness

echo 0 > /sys/class/leds/leds_pwm4/brightness

echo 255 > /sys/class/leds/leds_pwm4/brightness

echo 0 > /sys/class/leds/leds_pwm4/brightness

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