STM32103VET6,使用HAL库配置，500KHZ到1000KHZ频率的PWM无法产生。

Black · 发表于 2020-3-19 16:43:21

* TIM1 init function */
void MX_TIM1_Init(void)
{
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};
  TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};

  htim1.Instance = TIM1;
  //htim1.Init.Prescaler = 72-1;//72-0.001ms,720-0.01ms,7200-0.1ms //0.01ms-999ms

  htim1.Init.Prescaler =36-1;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 3;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 0;
  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
  {
Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 2;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  sConfigOC.OCIdleState = TIM_OCIDLESTATE_SET;
  sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
  if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
Error_Handler();
  }
  __HAL_TIM_DISABLE_OCxPRELOAD(&htim1, TIM_CHANNEL_1);
  sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
  sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
  sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
  sBreakDeadTimeConfig.DeadTime = 0;
  sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
  sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
  sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
  if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
  {
Error_Handler();
  }
  HAL_TIM_MspPostInit(&htim1);

}

void Set_TIM1_PWM(uint16_t Pwm,uint16_t Count,uint16_t fpsc)
{
// PWM的频率 = 72MHZ / ARR*CCR
uint16_t arr,ccr;
arr=SystemClock / Pwm ; //脉冲周期 x100HZ
if(arr<=2)
ccr=0;
else
   ccr=arr-2;
TIM1->ARR=arr-1;
TIM1->CCR1=ccr;
// 计数个数
TIM2->ARR=Count;
}

HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);//开启定时器1 PWM

此部分代码配置输出PWM，0.1KHZ-500KHZ，在示波器上有输出并精准，配置大于500KHZ时，PWM开始频率不精准，并且700KHZ左右开始到1MHZ，PWM没有输出。
有谁配置成功且输出精准，求指教