TIM3_PWM_Init(); TIM2_PWM_Init(); TIM4_PWM_Init();的初始化函数代码

由于这几个函数的实现可能依赖于具体的处理器和开发环境，因此它们的代码可能会有所不同。以下是一个示例代码，适用于STM32系列处理器的HAL库：

/* TIM3 PWM 初始化 */
void TIM3_PWM_Init(void)
{
  TIM_HandleTypeDef htim;
  TIM_OC_InitTypeDef sConfig;

  htim.Instance = TIM3;
  htim.Init.Prescaler = 0;
  htim.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim.Init.Period = 1000;
  htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  HAL_TIM_PWM_Init(&htim);

  sConfig.OCMode = TIM_OCMODE_PWM1;
  sConfig.Pulse = 500;
  sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfig.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_PWM_ConfigChannel(&htim, &sConfig, TIM_CHANNEL_1);
}

/* TIM2 PWM 初始化 */
void TIM2_PWM_Init(void)
{
  TIM_HandleTypeDef htim;
  TIM_OC_InitTypeDef sConfig;

  htim.Instance = TIM2;
  htim.Init.Prescaler = 0;
  htim.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim.Init.Period = 1000;
  htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  HAL_TIM_PWM_Init(&htim);

  sConfig.OCMode = TIM_OCMODE_PWM1;
  sConfig.Pulse = 500;
  sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfig.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_PWM_ConfigChannel(&htim, &sConfig, TIM_CHANNEL_1);
}

/* TIM4 PWM 初始化 */
void TIM4_PWM_Init(void)
{
  TIM_HandleTypeDef htim;
  TIM_OC_InitTypeDef sConfig;

  htim.Instance = TIM4;
  htim.Init.Prescaler = 0;
  htim.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim.Init.Period = 1000;
  htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  HAL_TIM_PWM_Init(&htim);

  sConfig.OCMode = TIM_OCMODE_PWM1;
  sConfig.Pulse = 500;
  sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfig.OCFastMode = TIM_OCFAST_DISABLE;
  HAL_TIM_PWM_ConfigChannel(&htim, &sConfig, TIM_CHANNEL_1);
}

以上示例代码使用了STM32的HAL库来实现，其中包括了对定时器时钟、工作模式、时基参数、PWM输出通道等的配置。这些配置可以根据具体的应用需求进行修改。