Friday, September 4, 2020

LED Blinking With STM32F103R6 Using SysTick

Using a timer interrupt allow any task to become active at any specific time. It makes the main program loop to do other tasks without waiting. SysTick is a timer bases on interrupt inside the STM32 ARM micro-controller.

LED Blinking With STM32F103R6 Using SysTick
Simulating Program In Proteus

In this introductory example, I use this time to toggle an LED. LED blinking is placed inside the SysTick function. It left the main program loop blank. We can place any task inside the main program loop, for example a button pressing event.

 

LED Blinking With STM32F103R6 Using SysTick

Code Configuration Wizard


Code configuration wizard allow the programmer to generate code by selecting and setting any features of the STM32 micro-controller. In this example, I select PC0 as an digital output connects to the LED. Its core source codes are generated by IOC.

  1. /* USER CODE BEGIN Header */
  2. /**
  3.   ******************************************************************************
  4.   * @file           : main.c
  5.   * @brief          : Main program body
  6.   ******************************************************************************
  7.   * @attention
  8.   *
  9.   * <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.
  10.   * All rights reserved.</center></h2>
  11.   *
  12.   * This software component is licensed by ST under BSD 3-Clause license,
  13.   * the "License"; You may not use this file except in compliance with the
  14.   * License. You may obtain a copy of the License at:
  15.   *                        opensource.org/licenses/BSD-3-Clause
  16.   *
  17.   ******************************************************************************
  18.   */
  19. /* USER CODE END Header */
  20. /* Includes ------------------------------------------------------------------*/
  21. #include "main.h"
  22.  
  23.  
  24. /* Private function prototypes -----------------------------------------------*/
  25. void SystemClock_Config(void);
  26. static void MX_GPIO_Init(void);
  27.  
  28. int main(void)
  29. {
  30.  
  31.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  32.   HAL_Init();
  33.   /* Configure the system clock */
  34.   SystemClock_Config();
  35.   /* Initialize all configured peripherals */
  36.   MX_GPIO_Init();
  37.  
  38.   /*SysTick Configuration*/
  39.   SystemCoreClockUpdate();
  40.   /*Generate interrupt for 10 ms*/
  41.   SysTick_Config(SystemCoreClock/100);
  42.   SysTick ->CTRL=0;
  43.   SysTick ->VAL=0;
  44.   SysTick ->CTRL=(SysTick_CTRL_TICKINT_Msk		//Enable SysTick Exception
  45. 		  	  	  |SysTick_CTRL_ENABLE_Msk //Enable SysTick system timer
  46. 				  |SysTick_CTRL_CLKSOURCE_Msk); //Use process clock source
  47.  
  48.   while (1)
  49.   {
  50.  
  51.   }
  52.   /* USER CODE END 3 */
  53. }
  54.  
  55. void SysTick_Handler(void)
  56. {
  57.   HAL_IncTick();
  58.   if(uwTick>=10){
  59. 	  HAL_GPIO_TogglePin(GPIOC,GPIO_PIN_0);
  60. 	  uwTick=0;
  61.   }
  62. }
  63.  
  64. /**
  65.   * @brief System Clock Configuration
  66.   * @retval None
  67.   */
  68. void SystemClock_Config(void)
  69. {
  70.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  71.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  72.  
  73.   /** Initializes the RCC Oscillators according to the specified parameters
  74.   * in the RCC_OscInitTypeDef structure.
  75.   */
  76.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  77.   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  78.   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  79.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  80.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  81.   {
  82.     Error_Handler();
  83.   }
  84.   /** Initializes the CPU, AHB and APB buses clocks
  85.   */
  86.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
  87.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  88.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  89.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  90.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  91.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  92.  
  93.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  94.   {
  95.     Error_Handler();
  96.   }
  97. }
  98.  
  99. /**
  100.   * @brief GPIO Initialization Function
  101.   * @param None
  102.   * @retval None
  103.   */
  104. static void MX_GPIO_Init(void)
  105. {
  106.   GPIO_InitTypeDef GPIO_InitStruct = {0};
  107.  
  108.   /* GPIO Ports Clock Enable */
  109.   __HAL_RCC_GPIOC_CLK_ENABLE();
  110.  
  111.   /*Configure GPIO pin Output Level */
  112.   HAL_GPIO_WritePin(GPIOC, GPIO_PIN_0, GPIO_PIN_RESET);
  113.  
  114.   /*Configure GPIO pin : PC0 */
  115.   GPIO_InitStruct.Pin = GPIO_PIN_0;
  116.   GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  117.   GPIO_InitStruct.Pull = GPIO_NOPULL;
  118.   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  119.   HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
  120.  
  121. }
  122.  
  123. /* USER CODE BEGIN 4 */
  124.  
  125. /* USER CODE END 4 */
  126.  
  127. /**
  128.   * @brief  This function is executed in case of error occurrence.
  129.   * @retval None
  130.   */
  131. void Error_Handler(void)
  132. {
  133.   /* USER CODE BEGIN Error_Handler_Debug */
  134.   /* User can add his own implementation to report the HAL error return state */
  135.   __disable_irq();
  136.   while (1)
  137.   {
  138.   }
  139.   /* USER CODE END Error_Handler_Debug */
  140. }
  141.  
  142. #ifdef  USE_FULL_ASSERT
  143. /**
  144.   * @brief  Reports the name of the source file and the source line number
  145.   *         where the assert_param error has occurred.
  146.   * @param  file: pointer to the source file name
  147.   * @param  line: assert_param error line source number
  148.   * @retval None
  149.   */
  150. void assert_failed(uint8_t *file, uint32_t line)
  151. {
  152.   /* USER CODE BEGIN 6 */
  153.   /* User can add his own implementation to report the file name and line number,
  154.      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  155.   /* USER CODE END 6 */
  156. }
  157. #endif /* USE_FULL_ASSERT */
  158.  
  159. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  160.  

The SysTick interrupt occurs for every 100us. Click here to download its source file.

For other similar posts please check,

  1. Getting Started With STM32F103C8T6 Module with STM32CubeIDE
  2.  STM32F103C8T6 Blue Pill SysTick and Multiplexing Display Example
  3.  STM32F103C8T6 Blue Pill Switch And Multiplexing Display Interface Using SysTick
  4.  STM32F103C8T6 Blue Pill SysTick LED Blinking
  5. STM32F103R6 Common Anode Seven Segments Display Example 
  6. STM32F103R6 Common Anode Seven Segments Display And Switch Interfacing 
  7. STM32F103R6 Simple 2-Digit Multiplexing Display And Switch Example 
  8. STM32F103R6 SysTick And Digital Clock Example 
  9. STM32F103R6 SysTick Two-Digit Multiplexing Display and Push Button
  10. LED Blinking With STM32F103R6 Using SysTick 
  11. STM32F103R6 SPI Interfaces To SN74HC595N Shift Registers
at
Labels: , , , , ,

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)