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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                燒錄內核后,我們可以在板子上看到PWM的設備節點: ![](https://img.kancloud.cn/db/4c/db4c6d7fdfa0d89083c0e5aa022361e2_554x246.png =400x) ### >[info] 說明一下:pwmchip0實際上是原廠評估板的LCD背光燈驅動,我們可以在設備樹中將其關調,這里忽略pwmchip0;其他的對應我們的三路PWM, 導出三路PWM: echo 0 > pwmchipx/export ![](https://img.kancloud.cn/79/13/791386b12e31e97ea2b7ea1285d3d38a_592x100.png =400x) ### 設置周期(單位是ns):echo ns > pwmchipx/pwm0/period 1s = 1000ms = 1000000us = 1000000000ns ![](https://img.kancloud.cn/df/54/df54294372092e36b10474db6190392f_774x96.png =600x) ### 設置占空比:echo ns > pwmchipx/pwm0/duty\_cycle 周期1秒,占空比0.5秒,也就是50% ![](https://img.kancloud.cn/85/70/85704872b4f79145f98c31606b3c1a1c_826x92.png =600x) ### 使能PWM:echo 1 > pwmchipx/pwm0/enable ![](https://img.kancloud.cn/42/f2/42f25d23d2af839bb62e053407116a09_642x90.png =600x) ### 使能PWM的時候,可以看到RGB燈珠的被正常驅動的過程: ![](https://img.kancloud.cn/3c/f3/3cf3a00206498c15758babd3d46cd657_832x568.png =600x) ### 效果是RGB燈閃爍,大家可以嘗試修改占空比看效果。
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