STM32定时器输出比较工作不正常

Question

我使用的是STM32L476 Nucleo板和STM32CubeMX。我想使用输出比较通道1超时2毫秒。我已经配置了计时器，但计时器没有为输出比较提供中断。我得到的是我给计时器的时间段的中断，但不是输出比较。

这是我的定时器配置：

static void MX_TIM1_Init(void)
{
/* USER CODE BEGIN TIM1_Init 0 */
/* USER CODE END TIM1_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_SlaveConfigTypeDef sSlaveConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};
/* USER CODE BEGIN TIM1_Init 1 */
/* USER CODE END TIM1_Init 1 */
htim1.Instance = TIM1;
htim1.Init.Prescaler = TIMER1_PRESCALER_VAL;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = TIMER_PERIOD;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_OC_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_DISABLE;
sSlaveConfig.InputTrigger = TIM_TS_ITR0;
if (HAL_TIM_SlaveConfigSynchro(&htim1, &sSlaveConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_OC1REF;
sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_ACTIVE;
sConfigOC.Pulse = 1000 * TIMER_OC_1_VAL;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if (HAL_TIM_OC_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
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.BreakFilter = 0;
sBreakDeadTimeConfig.Break2State = TIM_BREAK2_DISABLE;
sBreakDeadTimeConfig.Break2Polarity = TIM_BREAK2POLARITY_HIGH;
sBreakDeadTimeConfig.Break2Filter = 0;
sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM1_Init 2 */
HAL_TIM_OC_Start_IT(&htim1,TIM_IT_CC1);
/* USER CODE END TIM1_Init 2 */
HAL_TIM_MspPostInit(&htim1);
}

我尝试更改sConfigOC.Pulse值，但没有看到预期的行为。

Answer 1

是否在中断处理程序中检查正确的中断标志？还要记住，你必须马上清除国旗。

如果这对你有帮助的话，我的IRQ手柄看起来是这样的。

void TIM3_IRQHandler(void) {
if(LL_TIM_IsActiveFlag_CC1(TIM3) == 1) {
LL_TIM_ClearFlag_CC1(TIM3);
TimerCaptureCompare_Callback();
}
}

---

编辑：

看起来不错，HAL_TIM_OC_DelayElapsedCallback中断只有在计时器溢出(即重置(时才会触发。这意味着您必须启用溢出中断，因为HAL_TIM_OC_Start_IT仅启用捕获/比较中断。您只需要在启用计时器之前启用它。

__HAL_TIM_ENABLE_IT(&tim3, TIM_IT_UPDATE );

Answer 2

尝试将"TIM_IT_CC1"替换为"TIM_CHANNEL_1"。

Answer 3

首先，在启动计时器之前必须初始化输出引脚，如下所示：

/* USER CODE END TIM1_Init 2 */
HAL_TIM_MspPostInit(&htim1);
/* USER CODE BEGIN TIM1_Init 2 */
HAL_TIM_OC_Start_IT(&htim1,TIM_IT_CC1);

其次，您必须启动输出计时器

HAL_TIM_OC_Start_IT( &htim1, TIM_CHANNEL_1 );
HAL_TIM_Base_Start_IT( &htim1 );

Y您的输出引脚是这样启用的：(此代码适用于Stm32F4xx(

GPIO_InitStruct.Pin = GPIO_PIN_9; // channel 1
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

我不确定你是否需要BREAK代码。查看17.3.12使用参考手册中的中断功能