- /**
- ******************************************************************************
- * [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=895143]@version[/url] V1.5.0
- * [url=home.php?mod=space&uid=212281]@date[/url] 14-April-2017
- * [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
- *
- * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted provided that the following conditions are met:
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ******************************************************************************
- */
- /* 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)
- {
- /* STM32F1xx 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 24 MHz */
- SystemClock_Config();
- /* Configure LED3 & LED4 */
- BSP_LED_Init(LED3);
- BSP_LED_Init(LED4);
- /*##-1- Configure the TIM peripheral #######################################*/
- /* -----------------------------------------------------------------------
- In this example TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1),
- since APB1 prescaler is equal to 1.
- TIM3CLK = PCLK1
- PCLK1 = HCLK
- => TIM3CLK = 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(LED3);
- }
- /**
- * @brief System Clock Configuration
- * The system Clock is configured as follow :
- * System Clock source = PLL (HSE)
- * SYSCLK(Hz) = 24000000
- * HCLK(Hz) = 24000000
- * AHB Prescaler = 1
- * APB1 Prescaler = 1
- * APB2 Prescaler = 1
- * HSE Frequency(Hz) = 8000000
- * HSE PREDIV1 = 2
- * PLLMUL = 6
- * Flash Latency(WS) = 0
- * @param None
- * @retval None
- */
- void SystemClock_Config(void)
- {
- RCC_ClkInitTypeDef clkinitstruct = {0};
- RCC_OscInitTypeDef oscinitstruct = {0};
-
- /* Enable HSE Oscillator and activate PLL with HSE as source */
- oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
- oscinitstruct.HSEState = RCC_HSE_ON;
- oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV2;
- oscinitstruct.PLL.PLLState = RCC_PLL_ON;
- oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
- oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL6;
- 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_DIV1;
- if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_0)!= 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)
- {
- /* Turn LED4 on */
- BSP_LED_On(LED4);
- 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
- /**
- * @}
- */
- /**
- * @}
- */
- /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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