【RA】Stepless speed regulating fan-V1.0

The board is a motor driver board, with a reset button, a Boot button, a user button, two power indicators (motor drive power and chip power respectively), two user LEDs and a TB6612 motor driver chip, and leads to It removes unused chip pins and provides serial port programming and J-link programming ports. The program implementation mainly uses the GPT timer to output the PWM wave, and uses the ADC function of the P000 pin to collect the voltage on the rotating potentiometer. According to the collected voltage, the duty cycle of the PWM wave is changed to realize the control of the motor or fan. Speed ​​regulation, of course, you can also configure the high and low levels of P012 and P013 to realize the forward and reverse rotation of the motor. When writing the program, I found that the external 48MHz crystal oscillator is not needed, because the external crystal oscillator of the chip requires the highest bit of 24MHz, and the chip can generate 48MHz by itself. When high-precision RTC is required, the external 32.768KHz crystal oscillator needs to be welded. This project does not require Requires RTC, so no soldering.