[follow Jiangke University STM32] stm32f103c8t6_ PWM controlled DC motor_ code

Code ：

PWM.h

#ifndef __PWM_H
#define __PWM_H

void PWM_Init();
void PWM_SetCompare3(uint16_t Compare);

#endif

Inside the motor Coil and magnet , So in PWM Driven by , The buzzer will sound

When the SCM is set PWM When the frequency is within the range that our human ears can receive , We press and hold the rotating motor , You will hear an obvious buzzing （ The sound of buzzer ）
Methods of elimination ： enlarge PWM frequency , When PWM When the frequency is large enough , Beyond the scope of human ears , I can't hear it . Reduce prescaler , This will not affect the duty cycle
The radio frequency range of the human ear ：20Hz To 20kHz.
It is amended as follows ：TIM_TimeBaseInitStructure.TIM_Prescaler = 36 - 1; // The frequency changes to 20kHz

PWM.c

#include "stm32f10x.h" // Device header

void PWM_Init()
{
    
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);  // Turn on timer 2
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);// passageway 2 Clock enable function 
	
	GPIO_InitTypeDef GPIO_InitStructure; 				// Definition GPIO Initializing structure variables 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	// Set up GPIO For push-pull output mode 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;			
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	// The speed is set to  50MHz
	GPIO_Init(GPIOA, &GPIO_InitStructure);				// Proceed according to the above parameters  GPIO The initialization 
	
	TIM_InternalClockConfig(TIM2);//TIM The time base unit of is controlled by the internal clock 
	
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1; //ARR  The value of the automatic reloader 
	TIM_TimeBaseInitStructure.TIM_Prescaler = 720 - 1; //PSC  Prescaler value   Yes 72M（720000000） Conduct  720 frequency division   namely 1K At different frequencies   meter 1000 Number  1s Time for  
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;// Repeat counter value 
	TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure); 
	 	
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure);
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;// Output polarity selection 
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;// Output status enable 
	TIM_OCInitStructure.TIM_Pulse = 10;//CCR, That is, the duty cycle is  10%
	TIM_OC3Init(TIM2,&TIM_OCInitStructure);
	
	
	TIM_Cmd(TIM2,ENABLE);
}


void PWM_SetCompare3(uint16_t Compare)
{
    
	TIM_SetCompare3(TIM2, Compare);
}

Motor.h

#ifndef __MOTOR_H
#define __MOTOR_H

void Motor_Init();
void Motor_SetSpeed(int8_t Speed);
#endif

Motor.c

#include "stm32f10x.h" // Device header
#include "PWM.h"

void Motor_Init()
{
    
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);// passageway 2 Clock enable function 
	
	GPIO_InitTypeDef GPIO_InitStructure; 				// Definition GPIO Initializing structure variables 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;	// Set up GPIO For push-pull output mode 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;// Motor direction control foot 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	// The speed is set to  50MHz
	GPIO_Init(GPIOA, &GPIO_InitStructure);				// Proceed according to the above parameters  GPIO The initialization 

	PWM_Init();
}

void Motor_SetSpeed(int8_t Speed)
{
    
	if(Speed >= 0) // Positive rotation （ Turn clockwise ）
	{
    
		GPIO_SetBits(GPIOA, GPIO_Pin_4);
		GPIO_ResetBits(GPIOA, GPIO_Pin_5);
		PWM_SetCompare3(Speed);
	}
	else// reverse （ Turn counter clockwise ）
	{
    
		GPIO_ResetBits(GPIOA, GPIO_Pin_4);
		GPIO_SetBits(GPIOA, GPIO_Pin_5);
		PWM_SetCompare3(-Speed);
	}
}

main.c

Press the key to control the motor speed
Code here shows KeyNum = Key_GetNum(); What you get is B1 Pin value , So I put the button on this foot .

#include "stm32f10x.h" // Device header
#include "Delay.h"
#include "LED.h"
#include "Key.h"
#include "OLED.H"
#include "Motor.H"

uint8_t KeyNum,Speed;;

int main(void)
{
    
	OLED_Init();
	Motor_Init();
	Key_Init();
	
	OLED_ShowString(1,1,"Speed:");
	
	while (1)
	{
    
		KeyNum = Key_GetNum();
		if(KeyNum == 1)
		{
    
			Speed += 20;
			if(Speed > 100)
			{
    
				Speed = -100;
			}
		}
		Motor_SetSpeed(Speed);
		OLED_ShowNum(1,7,Speed,3);
	}
}

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