STM32F103通过PWM控制气泵的代码

以下是一个使用STM32F103控制气泵的PWM代码示例：

#include "stm32f10x.h"

#define PWM_PERIOD 2000 // PWM周期为2000个时钟周期
#define PWM_DUTY_CYCLE 1000 // PWM占空比为50%

int main(void)
{
  // 启用GPIOB和TIM3的时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

  // 配置GPIOB.0为复用推挽输出
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  // 配置TIM3为PWM模式
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD - 1;
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  TIM_OCInitTypeDef TIM_OCInitStructure;
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = PWM_DUTY_CYCLE - 1;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM3, &TIM_OCInitStructure);

  // 启动计时器
  TIM_Cmd(TIM3, ENABLE);

  while (1)
  {
    // 在这里可以控制PWM的占空比来控制气泵的转速
  }
}

该代码使用GPIOB.0和TIM3来产生PWM信号控制气泵的转速。使用`PWM_PERIOD`和`PWM_DUTY_CYCLE`宏定义来设置PWM的周期和占空比。在`while`循环中可以通过改变PWM的占空比来控制气泵的转速。