stm32 PWM控制直流电机代码

以下是一个基于STM32的PWM控制直流电机的示例代码：

#include "stm32f10x.h"

#define MOTOR_PIN GPIO_Pin_0  //定义电机所接的引脚
#define MOTOR_PORT GPIOA      //定义电机所接的引脚所在的GPIO端口
#define PWM_PIN GPIO_Pin_1    //定义PWM引脚
#define PWM_PORT GPIOA        //定义PWM引脚所在的GPIO端口
#define PWM_CHANNEL TIM_OC1  //定义PWM通道

int main(void)
{
    //初始化电机所接的引脚所在的GPIO端口
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = MOTOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(MOTOR_PORT, &GPIO_InitStructure);

    //初始化PWM引脚所在的GPIO端口
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = PWM_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(PWM_PORT, &GPIO_InitStructure);

    //初始化定时器
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    TIM_TimeBaseStructure.TIM_Period = 999;
    TIM_TimeBaseStructure.TIM_Prescaler = 71;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    //初始化PWM输出
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 500;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);

    //控制电机
    while (1)
    {
        GPIO_SetBits(MOTOR_PORT, MOTOR_PIN);  //使电机正转
        TIM_SetCompare1(TIM3, 800);           //调整占空比，控制电机转速
        delay_ms(1000);                       //延时1s
        GPIO_ResetBits(MOTOR_PORT, MOTOR_PIN);//使电机停止
        TIM_SetCompare1(TIM3, 0);             //关闭PWM输出
        delay_ms(1000);                       //延时1s
    }
}

上述代码中，使用了定时器TIM3和PWM输出通道TIM_OC1，将PWM引脚连接到TIM3的PWM输出通道TIM_OC1上。在while循环中，通过调整TIM_OC1的占空比来控制电机的转速，同时使用GPIO控制电机的正转和停止。需要注意的是，在调整占空比之前，需要先使能TIM3。