233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/**
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******************************************************************************
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* @file TIM/TIM_TimeBase/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use STM32F1xx TIM HAL API to generate
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* a time base of one second with the corresponding Interrupt request.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F1xx_HAL_Examples
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* @{
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*/
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/** @addtogroup TIM_TimeBase
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* TIM handle declaration */
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TIM_HandleTypeDef TimHandle;
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/* Prescaler declaration */
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uint32_t uwPrescalerValue = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void Error_Handler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* STM32F103xG HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Set NVIC Group Priority to 4
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 72 MHz */
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SystemClock_Config();
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/* Configure LED3 & LED4 */
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BSP_LED_Init(LED3);
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BSP_LED_Init(LED4);
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/*##-1- Configure the TIM peripheral #######################################*/
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/* -----------------------------------------------------------------------
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In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1) x2,
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since APB1 prescaler is set to 4 (0x100).
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TIM3CLK = PCLK1*2
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PCLK1 = HCLK/2
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=> TIM3CLK = PCLK1*2 = (HCLK/2)*2 = HCLK = SystemCoreClock
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To get TIM3 counter clock at 10 KHz, the Prescaler is computed as following:
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Prescaler = (TIM3CLK / TIM3 counter clock) - 1
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Prescaler = (SystemCoreClock /10 KHz) - 1
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Note:
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SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f1xx.c file.
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Each time the core clock (HCLK) changes, user had to update SystemCoreClock
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variable value. Otherwise, any configuration based on this variable will be incorrect.
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This variable is updated in three ways:
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1) by calling CMSIS function SystemCoreClockUpdate()
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2) by calling HAL API function HAL_RCC_GetSysClockFreq()
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3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
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----------------------------------------------------------------------- */
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/* Compute the prescaler value to have TIMx counter clock equal to 10000 Hz */
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uwPrescalerValue = (uint32_t)(SystemCoreClock / 10000) - 1;
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/* Set TIMx instance */
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TimHandle.Instance = TIMx;
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/* Initialize TIMx peripheral as follows:
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+ Period = 10000 - 1
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+ Prescaler = (SystemCoreClock/10000) - 1
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+ ClockDivision = 0
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+ Counter direction = Up
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*/
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TimHandle.Init.Period = 10000 - 1;
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TimHandle.Init.Prescaler = uwPrescalerValue;
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TimHandle.Init.ClockDivision = 0;
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TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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TimHandle.Init.RepetitionCounter = 0;
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TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/*##-2- Start the TIM Base generation in interrupt mode ####################*/
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/* Start Channel1 */
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if (HAL_TIM_Base_Start_IT(&TimHandle) != HAL_OK)
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{
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/* Starting Error */
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Error_Handler();
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}
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while (1)
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{
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}
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}
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/**
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* @brief Period elapsed callback in non blocking mode
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* @param htim : TIM handle
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* @retval None
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*/
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void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
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{
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BSP_LED_Toggle(LED3);
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 72000000
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* HCLK(Hz) = 72000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* HSE PREDIV1 = 1
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* PLLMUL = 9
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef clkinitstruct = {0};
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RCC_OscInitTypeDef oscinitstruct = {0};
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/* Enable HSE Oscillator and activate PLL with HSE as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
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oscinitstruct.HSEState = RCC_HSE_ON;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
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if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
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clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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/* Turn LED4 on */
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BSP_LED_On(LED4);
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while (1)
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{
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}
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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