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iTOP4412 LCD背光驱动(PWM)
2022-04-23 06:06:00 【OneSea】
0 前言
不同于《[Exynos4412][Tiny4412]LCD背光驱动(WLED)》,iTOP4412的LCD背光亮度通过PWM来调节,本文基于linux-3.0.15分析iTOP4412塑胶壳7寸LCD的背光驱动。
注:由于主要通过PWM实现亮度控制,因此本文还涉及PWM驱动。
1 原理
分析iTOP4412原理图得知LCD背光PWM控制引脚如下:

由于Exynos4412 GPD0输出PWM的电平是1.8V的,需要通过74ALVC1642
版权声明
本文为[OneSea]所创,转载请带上原文链接,感谢
https://blog.csdn.net/Q1302182594/article/details/122827413
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