stm通过l298n电机驱动模块使用pwm控制电机转速代码

以下是使用STM32和L298N电机驱动模块控制电机转速的代码，其中使用了STM32的PWM模块：

#include "stm32f10x.h"

#define Period 7199 // PWM周期 = 72M / (Prescaler*Frequency) - 1，其中Frequency为1000Hz，Prescaler为10

int main(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  TIM_TimeBaseStructure.TIM_Period = Period;
  TIM_TimeBaseStructure.TIM_Prescaler = 10 - 1;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 0;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM4, &TIM_OCInitStructure);
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);

  TIM_Cmd(TIM4, ENABLE);

  while (1) {
    TIM_SetCompare1(TIM4, 3600); // 设置通道1的占空比为50%
    TIM_SetCompare2(TIM4, 5400); // 设置通道2的占空比为75%
  }
}

在上述代码中，我们使用了STM32的TIM4通道1和通道2作为PWM输出，分别连接到L298N电机驱动模块的IN1和IN2输入端。我们在while循环中使用TIM_SetCompare1和TIM_SetCompare2函数分别设置通道1和通道2的占空比，从而控制电机的转速。注意，占空比的值应该在0到Period之间取值，其中0表示电机不转，Period表示电机转速最大。