Example Description

This example describes how to use pwm

Requirement Components:
    1~4 LED

Connect LED to below PWM pins and ground, then the LED would gradually become brighter and then darker with different speed.
 - connect a LED to PC_0 and ground
 - connect a LED to PC_1 and ground
 - connect a LED to PC_2 and ground
 - connect a LED to PC_3 and ground