stm32，pwm驱动三相电机程序

下面是一个使用STM32的定时器和PWM输出来驱动三相电机的示例程序，假设你使用的是STM32F103系列的开发板：

1. 首先，需要定义引脚和变量：

#define MOTOR_PIN_UH GPIO_Pin_0 // U相引脚
#define MOTOR_PIN_UL GPIO_Pin_1
#define MOTOR_PIN_VH GPIO_Pin_2 // V相引脚
#define MOTOR_PIN_VL GPIO_Pin_3
#define MOTOR_PIN_WH GPIO_Pin_4 // W相引脚
#define MOTOR_PIN_WL GPIO_Pin_5
#define MOTOR_PORT GPIOA // 三相电机接口引脚所在的端口
#define PWM_FREQ 20000 // PWM信号频率，单位Hz
#define PWM_MIN 0 // PWM信号占空比最小值，0%
#define PWM_MAX 100 // PWM信号占空比最大值，100%

2. 在main()函数中，需要初始化GPIO口和定时器：

int main(void) {
  // 初始化GPIO口
  GPIO_InitTypeDef GPIO_InitStruct;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  GPIO_InitStruct.GPIO_Pin = MOTOR_PIN_UH | MOTOR_PIN_UL | MOTOR_PIN_VH | MOTOR_PIN_VL | MOTOR_PIN_WH | MOTOR_PIN_WL;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(MOTOR_PORT, &GPIO_InitStruct);

  // 初始化定时器
  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
  TIM_OCInitTypeDef TIM_OCInitStruct;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  TIM_TimeBaseInitStruct.TIM_Prescaler = SystemCoreClock / PWM_FREQ - 1;
  TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInitStruct.TIM_Period = 100 - 1;
  TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);
  TIM_Cmd(TIM2, ENABLE);
  TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OCInitStruct.TIM_Pulse = PWM_MIN;
  TIM_OC1Init(TIM2, &TIM_OCInitStruct);
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
  TIM_OCInitStruct.TIM_Pulse = PWM_MIN;
  TIM_OC2Init(TIM2, &TIM_OCInitStruct);
  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
  TIM_OCInitStruct.TIM_Pulse = PWM_MIN;
  TIM_OC3Init(TIM2, &TIM_OCInitStruct);
  TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

  // 循环执行
  while (1) {
    // U相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, i);
      TIM_SetCompare2(TIM2, PWM_MIN);
      TIM_SetCompare3(TIM2, PWM_MIN);
      delay_ms(10);
    }

    // U相正向，V相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, i);
      TIM_SetCompare2(TIM2, 0);
      TIM_SetCompare3(TIM2, PWM_MIN);
      delay_ms(10);
    }

    // V相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, PWM_MAX);
      TIM_SetCompare2(TIM2, i);
      TIM_SetCompare3(TIM2, PWM_MIN);
      delay_ms(10);
    }

    // V相正向，W相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, PWM_MAX);
      TIM_SetCompare2(TIM2, i);
      TIM_SetCompare3(TIM2, 0);
      delay_ms(10);
    }

    // W相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, PWM_MAX);
      TIM_SetCompare2(TIM2, PWM_MAX);
      TIM_SetCompare3(TIM2, i);
      delay_ms(10);
    }

    // W相正向，U相正向
    for (int i = PWM_MIN; i <= PWM_MAX; i++) {
      TIM_SetCompare1(TIM2, 0);
      TIM_SetCompare2(TIM2, PWM_MAX);
      TIM_SetCompare3(TIM2, i);
      delay_ms(10);
    }
  }
}

以上是一个使用STM32的定时器和PWM输出来驱动三相电机的示例程序，可以根据实际需要进行修改和优化。需要注意的是，程序中使用了delay_ms()函数来延时，这个函数需要自己实现或者使用STM32提供的延时函数。同时，程序中的PWM输出顺序需要根据具体的电机类型来确定，这里仅提供一种常见的顺序。