基于STM32G4系列对定时器双向断路输入Bidirectional break inputs的应用测试

测试以STM32G4系列的B-G474E-DPOW1为例，基础知识详见《基于STM32H7x3系列对定时器双向断路输入Bidirectional break inputs的理解》

测试描述

1.适用于STM32G474RETx Devices；

2.系统时钟设为170MHz，TIM1输入时钟选择APB2 clock (PCLK2)，即TIM1CLK = HCLK = SystemCoreClock；

3.TIM1的计数频率设为85 MHz，即Prescaler = (TIM1CLK / TIM1 counter clock) – 1，Prescaler = ((SystemCoreClock) /85 MHz) – 1；

4.TIM1的输出频率设为85 KHz，即ARR = (TIM1 counter clock / TIM1 output clock) – 1=999；

5.设置TIM1通道占空比分别为：TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR + 1)* 100 = 50%，TIM1 Channel2 duty cycle = (TIM1_CCR2/ TIM1_ARR + 1)* 100 = 37.5%，TIM1 Channel3 duty cycle = (TIM1_CCR3/ TIM1_ARR + 1)* 100 = 25%；

6.设置break触发源为TIM_BREAKINPUTSOURCE_COMP1和TIM_BREAKINPUTSOURCE_BKIN；

7.设置BKINP位为“1”，BKP位为“1”；

测试细节

设置break双向管脚：

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* htim_pwm)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(htim_pwm->Instance==TIM1)
  {
  

  
    
    __HAL_RCC_TIM1_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    
    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF6_TIM1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  

  
  }

}

设置PWM输出管脚：

void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(htim->Instance==TIM1)
  {
  

  
  
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    
    GPIO_InitStruct.Pin = GPIO_PIN_13 | GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF6_TIM1;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_15;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF4_TIM1;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF6_TIM1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  

  
  }

}

设置比较器输出管脚：

void HAL_COMP_MspInit(COMP_HandleTypeDef* hcomp)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hcomp->Instance==COMP1)
  {
  

  
  
    __HAL_RCC_GPIOB_CLK_ENABLE();
    
    GPIO_InitStruct.Pin = GPIO_PIN_1;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
  

  
  }

}

配置break输入源：

 sBreakInputConfig.Source = TIM_BREAKINPUTSOURCE_COMP1;
  sBreakInputConfig.Enable = TIM_BREAKINPUTSOURCE_ENABLE;
  sBreakInputConfig.Polarity = TIM_BREAKINPUTSOURCE_POLARITY_LOW;
  if (HAL_TIMEx_ConfigBreakInput(&htim1, TIM_BREAKINPUT_BRK, &sBreakInputConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sBreakInputConfig.Source = TIM_BREAKINPUTSOURCE_BKIN;
  sBreakInputConfig.Enable = TIM_BREAKINPUTSOURCE_ENABLE;
  sBreakInputConfig.Polarity = TIM_BREAKINPUTSOURCE_POLARITY_LOW;
  if (HAL_TIMEx_ConfigBreakInput(&htim1, TIM_BREAKINPUT_BRK, &sBreakInputConfig) != HAL_OK)
  {
    Error_Handler();
  }

配置死区及break双向IO：

  sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_ENABLE;
  sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_ENABLE;
  sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
  sBreakDeadTimeConfig.DeadTime = 100;
  sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
  sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
  sBreakDeadTimeConfig.BreakFilter = 0;
  sBreakDeadTimeConfig.BreakAFMode = TIM_BREAK_AFMODE_BIDIRECTIONAL;
  sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;
  sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;
  sBreakDeadTimeConfig.Break2Filter = 0;
  sBreakDeadTimeConfig.Break2AFMode = TIM_BREAK_AFMODE_INPUT;
  sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_ENABLE;
  if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
  {
    Error_Handler();
  }

主函数：

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  MX_GPIO_Init();
  MX_TIM1_Init();
  MX_COMP1_Init();
  
  if(HAL_COMP_Start(&hcomp1) != HAL_OK)
  {
    
    Error_Handler(); 
  }
  
  if (HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1) != HAL_OK)
  {
    
    Error_Handler();
  }
  
  if(HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_1) != HAL_OK)
  {
    
    Error_Handler();
  }
  
  if (HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_2) != HAL_OK)
  {
    
    Error_Handler();
  }
  
  if(HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_2) != HAL_OK)
  {
    
    Error_Handler();
  }
  
  if (HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_3) != HAL_OK)
  {
    
    Error_Handler();
  }
  
  if(HAL_TIMEx_PWMN_Start(&htim1, TIM_CHANNEL_3) != HAL_OK)
  {
    
    Error_Handler();
  }
  
	MODIFY_REG(htim1.Instance->BDTR, TIM_BDTR_BKE, TIM_BREAK_ENABLE);

  

  
  
  while (1) { }
}

测试过程与现象

Channel0~5分别为TIM1CH0，TIM1CH0N，TIM1CH1，TIM1CH1N，TIM1CH2，TIM1CH2N；Channel7为break双向IO；

1.COMP1引脚接低，正常输出6路互补通道；

2.COMP1引脚接高电平或将比较输出极性转变，定时器进入break状态，双向IO输出低电平；

3.将BKDSRM位置高，请求释放输出控制，等待所有系统断路请求消失，等待BKDSRM (BK2DSRM)位硬件清零。

4. COMP1引脚接低电平或将比较输出极性转变，定时器进入输出状态。