PWM timer

5 请教在STM32F103上输出精准脉宽的脉冲的实现方案

发布于 2022-03-24 14:21:57 浏览：1073 订阅该版

yks 2022-03-25

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游走在01的海洋 2022-03-24

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chenwanlei 2022-03-25

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moluxiyan 2022-03-29

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## 最终的解决方案贴一下

#### 还是采用的PWM 的oneshot模式，只是改了下HAL库函数

首先按照cubeMX配置pwm为单脉冲模式，因为默认的单脉冲模式是将通道1和2任意一口作为触发输入，另一个口输出脉冲，但我没有输入触发，因此我需要手动软件触发，
在start前调用这个函数：__HAL_TIM_ENABLE(&htim3)
然后在调用：HAL_TIM_OnePulse_Start

HAL_TIM_OnePulse_Start函数默认是unused channel ， 会使能两个通道，但是我想一路一路分别输出，所以做了如下改动，具体情况请看下面代码，其中也有官方的注释。

```
/**
  * @brief  Starts the TIM One Pulse signal generation.
  * @param  htim TIM One Pulse handle
  * @param  OutputChannel TIM Channels to be enabled
  *          This parameter can be one of the following values:
  *            @arg TIM_CHANNEL_1: TIM Channel 1 selected
  *            @arg TIM_CHANNEL_2: TIM Channel 2 selected
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_TIM_OnePulse_Start(TIM_HandleTypeDef *htim, uint32_t OutputChannel)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(OutputChannel);

/* Enable the Capture compare and the Input Capture channels
    (in the OPM Mode the two possible channels that can be used are TIM_CHANNEL_1 and TIM_CHANNEL_2)
    if TIM_CHANNEL_1 is used as output, the TIM_CHANNEL_2 will be used as input and
    if TIM_CHANNEL_1 is used as input, the TIM_CHANNEL_2 will be used as output
    in all combinations, the TIM_CHANNEL_1 and TIM_CHANNEL_2 should be enabled together

No need to enable the counter, it's enabled automatically by hardware
    (the counter starts in response to a stimulus and generate a pulse */
/*屏蔽之前的*/
//  TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_1, TIM_CCx_ENABLE);
//  TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
	/*新增的*/
	if(OutputChannel == TIM_CHANNEL_1)
	{
		TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_1, TIM_CCx_ENABLE);
	
		TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_2, TIM_CCx_DISABLE);
	}
	else
	{
		TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
	
		TIM_CCxChannelCmd(htim->Instance, TIM_CHANNEL_1, TIM_CCx_DISABLE);
	}
	
  if (IS_TIM_BREAK_INSTANCE(htim->Instance) != RESET)
  {
    /* Enable the main output */
    __HAL_TIM_MOE_ENABLE(htim);
  }

/* Return function status */
  return HAL_OK;
}

```