Starting one shot TIM1 and catching interrupt of count down event

[chriskuku]

My idea is, to implement a timer (TIM1 in this case).

Given a certain key pressed, I want to fire it up, let it count down causing an interrupt.

This are the parameters I gave it in the init procedure. (STM32F103C8T6)

static void MX_TIM1_Init(void)
{
 
  /* USER CODE BEGIN TIM1_Init 0 */
 
  /* USER CODE END TIM1_Init 0 */
 
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
 
  /* USER CODE BEGIN TIM1_Init 1 */
 
  /* USER CODE END TIM1_Init 1 */
  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 7200;
  htim1.Init.CounterMode = TIM_COUNTERMODE_DOWN;
  htim1.Init.Period = 5000;
  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_OnePulse_Init(&htim1, TIM_OPMODE_SINGLE) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM1_Init 2 */
 
  /* USER CODE END TIM1_Init 2 */
 
}

1\ How to I start the timer?

2\ where do I find the IR service routine?

[chriskuku]

Or in other words: under which circumstances an ISR and callback routine is automatically being generated? At the moment I'm missing such.

[waclawek.jan]

> 1\ How to I start the timer?

By setting TIMx_CR1.CEN.

> 2\ where do I find the IR service routine?

Wherever you write it, just make sure it's name is identical with the name in the vector table, which is usually in the startup code.

> Or in other words: under which circumstances an ISR and callback routine is automatically being generated? At the moment I'm missing such.

OK so if this question was "how do I click in CubeMX so that this automagically works", I don't know, I don't use Cube/CubeMX.

JW

[chriskuku]

Maybe I forgot to tic the Interrupt check box in the .ioc Timer configuration, since I didn't see an interrupt in the source file.

What is the interrupt that is fired, when the timer reaches 65536 (overflow). Is it the Tim1_BREAK interrupt? Or is it the Capture_Compare Interrupt?

[chriskuku]

@Community member​ the much I appreciate your answer, but it isn't appropriate in my case. I don't like HAL either but I succeeded in one case and would like to stay with the (HAL based) program for now.

This is the code so far:

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
 
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
 
/* USER CODE END Includes */
 
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
 
/* USER CODE END PTD */
 
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
 
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
 
/* USER CODE END PM */
 
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim1;
 
/* USER CODE BEGIN PV */
 
/* USER CODE END PV */
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM1_Init(void);
/* USER CODE BEGIN PFP */
void pc13_on(void);
void pc13_off(void);
/* USER CODE END PFP */
 
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
 
/* USER CODE END 0 */
 
/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
 
  /* USER CODE END 1 */
 
  /* MCU Configuration--------------------------------------------------------*/
 
  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();
 
  /* USER CODE BEGIN Init */
 
  /* USER CODE END Init */
 
  /* Configure the system clock */
  SystemClock_Config();
 
  /* USER CODE BEGIN SysInit */
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_TIM1_Init();
  /* USER CODE BEGIN 2 */
  HAL_TIM_Base_Start(&htim1);
  HAL_TIM_Base_Start_IT(&htim1);
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
 
    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
 
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}
 
/**
  * @brief TIM1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM1_Init(void)
{
 
  /* USER CODE BEGIN TIM1_Init 0 */
 
  /* USER CODE END TIM1_Init 0 */
 
  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
 
  /* USER CODE BEGIN TIM1_Init 1 */
 
  /* USER CODE END TIM1_Init 1 */
  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 7200;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 15535;
  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_OnePulse_Init(&htim1, TIM_OPMODE_SINGLE) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM1_Init 2 */
 
  /* USER CODE END TIM1_Init 2 */
 
}
 
/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
 
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_14, GPIO_PIN_RESET);
 
  /*Configure GPIO pin : PC13 */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
  /*Configure GPIO pin : PA14 */
  GPIO_InitStruct.Pin = GPIO_PIN_14;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
}
 
/* USER CODE BEGIN 4 */
void pc13_off(){
	GPIOC->ODR=0xffffffff;
 
 
}
void pc13_on(){
	GPIOC->ODR=~(1<<13);
 
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef* htim){
   pc13_off();
}
 
 
/* USER CODE END 4 */
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

The purpose is to trigger the timer once and let it generate an interrupt after 0.5 s.

The timer code doesn't seem to land in the ISR.

[AScha.3]

set int active in Cube, [gen.code] , then see timer int in stm...xx_it.c file .

ex:

then see in xx_it.c :

[chriskuku]

Thanks.

I'm using TIM1. I don't see global interrupt. Also, why DMA2 stream0 global interrupt? I don't use DMA. Furthermore this is an STM32F103 (blue pill) and it doesn't have a TIM5.

[AScha.3]

hey, this was just example (from my H743 ), to show you , how to do.

you need click on the int you want to enable them !!!! x = enabled !

then : gen. -> get int in xxxit.c

[chriskuku]

OK, I now have this in stm32f1xx.c:

/**
  * @brief This function handles TIM4 global interrupt.
  */
void TIM4_IRQHandler(void)
{
  /* USER CODE BEGIN TIM4_IRQn 0 */
 
  /* USER CODE END TIM4_IRQn 0 */
  HAL_TIM_IRQHandler(&htim4);
  /* USER CODE BEGIN TIM4_IRQn 1 */
 
  /* USER CODE END TIM4_IRQn 1 */
}

with this longish:

/**
  * @brief  This function handles TIM interrupts requests.
  * @param  htim TIM  handle
  * @retval None
  */
void HAL_TIM_IRQHandler(TIM_HandleTypeDef *htim)
{
  /* Capture compare 1 event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC1) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC1) != RESET)
    {
      {
        __HAL_TIM_CLEAR_IT(htim, TIM_IT_CC1);
        htim->Channel = HAL_TIM_ACTIVE_CHANNEL_1;
 
        /* Input capture event */
        if ((htim->Instance->CCMR1 & TIM_CCMR1_CC1S) != 0x00U)
        {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
          htim->IC_CaptureCallback(htim);
#else
          HAL_TIM_IC_CaptureCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
        }
        /* Output compare event */
        else
        {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
          htim->OC_DelayElapsedCallback(htim);
          htim->PWM_PulseFinishedCallback(htim);
#else
          HAL_TIM_OC_DelayElapsedCallback(htim);
          HAL_TIM_PWM_PulseFinishedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
        }
        htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
      }
    }
  }
  /* Capture compare 2 event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC2) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC2) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_CC2);
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_2;
      /* Input capture event */
      if ((htim->Instance->CCMR1 & TIM_CCMR1_CC2S) != 0x00U)
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->IC_CaptureCallback(htim);
#else
        HAL_TIM_IC_CaptureCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      /* Output compare event */
      else
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->OC_DelayElapsedCallback(htim);
        htim->PWM_PulseFinishedCallback(htim);
#else
        HAL_TIM_OC_DelayElapsedCallback(htim);
        HAL_TIM_PWM_PulseFinishedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
    }
  }
  /* Capture compare 3 event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC3) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC3) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_CC3);
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_3;
      /* Input capture event */
      if ((htim->Instance->CCMR2 & TIM_CCMR2_CC3S) != 0x00U)
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->IC_CaptureCallback(htim);
#else
        HAL_TIM_IC_CaptureCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      /* Output compare event */
      else
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->OC_DelayElapsedCallback(htim);
        htim->PWM_PulseFinishedCallback(htim);
#else
        HAL_TIM_OC_DelayElapsedCallback(htim);
        HAL_TIM_PWM_PulseFinishedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
    }
  }
  /* Capture compare 4 event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC4) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_CC4) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_CC4);
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_4;
      /* Input capture event */
      if ((htim->Instance->CCMR2 & TIM_CCMR2_CC4S) != 0x00U)
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->IC_CaptureCallback(htim);
#else
        HAL_TIM_IC_CaptureCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      /* Output compare event */
      else
      {
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
        htim->OC_DelayElapsedCallback(htim);
        htim->PWM_PulseFinishedCallback(htim);
#else
        HAL_TIM_OC_DelayElapsedCallback(htim);
        HAL_TIM_PWM_PulseFinishedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
      }
      htim->Channel = HAL_TIM_ACTIVE_CHANNEL_CLEARED;
    }
  }
  /* TIM Update event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_UPDATE) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_UPDATE) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_UPDATE);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
      htim->PeriodElapsedCallback(htim);
#else
      HAL_TIM_PeriodElapsedCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
    }
  }
  /* TIM Break input event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_BREAK) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_BREAK) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_BREAK);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
      htim->BreakCallback(htim);
#else
      HAL_TIMEx_BreakCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
    }
  }
  /* TIM Trigger detection event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_TRIGGER) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_TRIGGER) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_IT_TRIGGER);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
      htim->TriggerCallback(htim);
#else
      HAL_TIM_TriggerCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
    }
  }
  /* TIM commutation event */
  if (__HAL_TIM_GET_FLAG(htim, TIM_FLAG_COM) != RESET)
  {
    if (__HAL_TIM_GET_IT_SOURCE(htim, TIM_IT_COM) != RESET)
    {
      __HAL_TIM_CLEAR_IT(htim, TIM_FLAG_COM);
#if (USE_HAL_TIM_REGISTER_CALLBACKS == 1)
      htim->CommutationCallback(htim);
#else
      HAL_TIMEx_CommutCallback(htim);
#endif /* USE_HAL_TIM_REGISTER_CALLBACKS */
    }
  }
}

BTW, is the logic reversed ? :

USE_HAL_TIM_REGISTER_CALLBACKS == 1

Anyway, which callback would I have to implement? To recall: the timer should fire only once (oneshot).

[AScha.3]

>OK, I now have this in stm32f1xx.c:

• so you have now, what you asked for

>which callback would I have to implement? 

• why add and take callbacks now? use for...what?

>BTW, is the logic reversed ? :

• your logic .. ?

and please dont post the HAL library code in full length, posting it is 100% useless.