- /**
- ******************************************************************************
- * [url=home.php?mod=space&uid=288409]@file[/url] TIM/TIM_TimeBase/Src/main.c
- * [url=home.php?mod=space&uid=187600]@author[/url] MCD Application Team
- * [url=home.php?mod=space&uid=247401]@brief[/url] This sample code shows how to use STM32F1xx TIM HAL API to generate
- * a time base of one second with the corresponding Interrupt request.
- ******************************************************************************
- * @attention
- *
- * Copyright (c) 2016 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.
- *
- ******************************************************************************
- */
- /* Includes ------------------------------------------------------------------*/
- #include "main.h"
- /** @addtogroup STM32F1xx_HAL_Examples
- * @{
- */
- /** @addtogroup TIM_TimeBase
- * @{
- */
- /* Private typedef -----------------------------------------------------------*/
- /* Private define ------------------------------------------------------------*/
- /* Private macro -------------------------------------------------------------*/
- /* Private variables ---------------------------------------------------------*/
- /* TIM handle declaration */
- TIM_HandleTypeDef TimHandle;
- /* Prescaler declaration */
- uint32_t uwPrescalerValue = 0;
- /* Private function prototypes -----------------------------------------------*/
- void SystemClock_Config(void);
- static void Error_Handler(void);
- /* Private functions ---------------------------------------------------------*/
- /**
- * @brief Main program
- * @param None
- * @retval None
- */
- int main(void)
- {
- /* STM32F103xB HAL library initialization:
- - Configure the Flash prefetch
- - Systick timer is configured by default as source of time base, but user
- can eventually implement his proper time base source (a general purpose
- timer for example or other time source), keeping in mind that Time base
- duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
- handled in milliseconds basis.
- - Set NVIC Group Priority to 4
- - Low Level Initialization
- */
- HAL_Init();
- /* Configure the system clock to 64 MHz */
- SystemClock_Config();
- /* Configure LED2 */
- BSP_LED_Init(LED2);
- /*##-1- Configure the TIM peripheral #######################################*/
- /* -----------------------------------------------------------------------
- In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1) x2,
- since APB1 prescaler is set to 4 (0x100).
- TIM3CLK = PCLK1*2
- PCLK1 = HCLK/2
- => TIM3CLK = PCLK1*2 = (HCLK/2)*2 = HCLK = SystemCoreClock
- To get TIM3 counter clock at 10 KHz, the Prescaler is computed as following:
- Prescaler = (TIM3CLK / TIM3 counter clock) - 1
- Prescaler = (SystemCoreClock /10 KHz) - 1
- Note:
- SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f1xx.c file.
- Each time the core clock (HCLK) changes, user had to update SystemCoreClock
- variable value. Otherwise, any configuration based on this variable will be incorrect.
- This variable is updated in three ways:
- 1) by calling CMSIS function SystemCoreClockUpdate()
- 2) by calling HAL API function HAL_RCC_GetSysClockFreq()
- 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
- ----------------------------------------------------------------------- */
- /* Compute the prescaler value to have TIMx counter clock equal to 10000 Hz */
- uwPrescalerValue = (uint32_t)(SystemCoreClock / 10000) - 1;
- /* Set TIMx instance */
- TimHandle.Instance = TIMx;
- /* Initialize TIMx peripheral as follows:
- + Period = 10000 - 1
- + Prescaler = (SystemCoreClock/10000) - 1
- + ClockDivision = 0
- + Counter direction = Up
- */
- TimHandle.Init.Period = 10000 - 1;
- TimHandle.Init.Prescaler = uwPrescalerValue;
- TimHandle.Init.ClockDivision = 0;
- TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
- TimHandle.Init.RepetitionCounter = 0;
- TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
- if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
- {
- /* Initialization Error */
- Error_Handler();
- }
- /*##-2- Start the TIM Base generation in interrupt mode ####################*/
- /* Start Channel1 */
- if (HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
- {
- /* Starting Error */
- Error_Handler();
- }
- while (1)
- {
- }
- }
- /**
- * @brief Period elapsed callback in non blocking mode
- * @param htim : TIM handle
- * @retval None
- */
- void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
- {
- BSP_LED_Toggle(LED2);
- }
- /**
- * @brief System Clock Configuration
- * The system Clock is configured as follow :
- * System Clock source = PLL (HSI)
- * SYSCLK(Hz) = 64000000
- * HCLK(Hz) = 64000000
- * AHB Prescaler = 1
- * APB1 Prescaler = 2
- * APB2 Prescaler = 1
- * PLLMUL = 16
- * Flash Latency(WS) = 2
- * @param None
- * @retval None
- */
- void SystemClock_Config(void)
- {
- RCC_ClkInitTypeDef clkinitstruct = {0};
- RCC_OscInitTypeDef oscinitstruct = {0};
-
- /* Configure PLL ------------------------------------------------------*/
- /* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
- /* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
- /* Enable HSI and activate PLL with HSi_DIV2 as source */
- oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
- oscinitstruct.HSEState = RCC_HSE_OFF;
- oscinitstruct.LSEState = RCC_LSE_OFF;
- oscinitstruct.HSIState = RCC_HSI_ON;
- oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
- oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
- oscinitstruct.PLL.PLLState = RCC_PLL_ON;
- oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
- oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
- if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
- {
- /* Initialization Error */
- while(1);
- }
- /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
- clocks dividers */
- clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
- clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
- clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
- clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
- clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
- if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
- {
- /* Initialization Error */
- while(1);
- }
- }
- /**
- * @brief This function is executed in case of error occurrence.
- * @param None
- * @retval None
- */
- static void Error_Handler(void)
- {
- while (1)
- {
- }
- }
- #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 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) */
- /* Infinite loop */
- while (1)
- {
- }
- }
- #endif
- /**
- * @}
- */
- /**
- * @}
- */
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