Introduction - If you have any usage issues, please Google them yourself
The procedure for the PWM program, note the use of using a clock program shizhong (), in SMCLK is 1MHZ, the maximum frequency of 10KHZ, SMCLK is 8MHZ, the maximum frequency of about 80KHZ, PWM wave can be obtained by calling the function, if you need two duty cycle of the PWM, the following function descriptions modify, or delete the shield section