Linux kernel point brightness LEDS (lighting master)
The most basic and most commonly used control LED in the Linux learning process seems to be very simple, but it is actually very simple. The most common way to light up the LED is to control the high and low levels of the GPIO to realize the on-off change. At a deeper level, use pwm to adjust the brightness value, and at a deeper level, it is a program-controlled LED. There are many ways, profound comprehension, active learning and application can comprehend different colors.
提示：LED 控制，深挖后会发现不一样的天地。