TIM_OCToggle
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Outline
Includes
#include "main.h"
Private variables
uhCCR1_Val
uhCCR2_Val
uhCCR3_Val
uhCCR4_Val
uhCapture
TimHandle
sConfig
uwPrescalerValue
Private function prototypes
main()
HAL_TIM_OC_DelayElapsedCallback(TIM_HandleTypeDef *)
Error_Handler()
SystemClock_Config()
Files
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SourceVuSTM32 Libraries and SamplesTIM_OCToggleSrc/main.c
 
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/** ****************************************************************************** * @file TIM/TIM_OCToggle/Src/main.c * @author MCD Application Team * @brief This sample code shows how to use STM32F4xx TIM HAL API to generate * 4 signals in PWM. ****************************************************************************** * @attention * * Copyright (c) 2017 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 STM32F4xx_HAL_Examples * @{ *//* ... */ /** @addtogroup TIM_OCToggle * @{ *//* ... */ Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ __IO uint32_t uhCCR1_Val = 40961; __IO uint32_t uhCCR2_Val = 20480; __IO uint32_t uhCCR3_Val = 10240; __IO uint32_t uhCCR4_Val = 5120; uint32_t uhCapture = 0; /* Timer handler declaration */ TIM_HandleTypeDef TimHandle; /* Timer Output Compare Configuration Structure declaration */ TIM_OC_InitTypeDef sConfig; /* Counter Prescaler value */ uint32_t uwPrescalerValue = 0; Private variables /* Private function prototypes -----------------------------------------------*/ static void SystemClock_Config(void); static void Error_Handler(void); Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None *//* ... */ int main(void) { /* STM32F4xx HAL library initialization: - Configure the Flash prefetch, instruction and Data caches - Configure the Systick to generate an interrupt each 1 msec - Set NVIC Group Priority to 4 - Global MSP (MCU Support Package) initialization *//* ... */ HAL_Init(); /* Configure the system clock to 168 MHz */ SystemClock_Config(); /* Configure LED1 and LED3 */ BSP_LED_Init(LED1); BSP_LED_Init(LED3); /*##-1- Configure the TIM peripheral #######################################*/ /* --------------------------------------------------------------------------- TIM3 Configuration: Output Compare Toggle Mode: In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1), since APB1 prescaler is different from 1. TIM3CLK = 2 * PCLK1 PCLK1 = HCLK / 4 => TIM3CLK = HCLK / 2 = SystemCoreClock /2 To get TIM3 counter clock at 21 MHz, the prescaler is computed as follows: Prescaler = (TIM3CLK / TIM3 counter clock) - 1 Prescaler = ((SystemCoreClock /2) /21 MHz) - 1 CC1 update rate = TIM3 counter clock / uhCCR1_Val = 512.68 Hz ==> So the TIM3 Channel 1 generates a periodic signal with a frequency equal to 256.35 Hz. CC2 update rate = TIM3 counter clock / uhCCR2_Val = 1025.39 Hz ==> So the TIM3 Channel 2 generates a periodic signal with a frequency equal to 512.7 Hz. CC3 update rate = TIM3 counter clock / uhCCR3_Val = 2050.8 Hz ==> So the TIM3 Channel 3 generates a periodic signal with a frequency equal to 1025.4 Hz. CC4 update rate = TIM3 counter clock / uhCCR4_Val = 4101.56 Hz ==> So the TIM3 Channel 4 generates a periodic signal with a frequency equal to 2050.78 Hz. Note: SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.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 21 MHz */ uwPrescalerValue = (uint32_t)(((SystemCoreClock /2) / 21000000) - 1); /* Initialize TIMx peripheral as follow: + Prescaler = ((SystemCoreClock /2) / 21000000) - 1 + Period = 65535 + ClockDivision = 0 + Counter direction = Up *//* ... */ TimHandle.Instance = TIMx; TimHandle.Init.Period = 65535; TimHandle.Init.Prescaler = uwPrescalerValue; TimHandle.Init.ClockDivision = 0; TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if(HAL_TIM_OC_Init(&TimHandle) != HAL_OK) { /* Initialization Error */ Error_Handler(); }if (HAL_TIM_OC_Init(&TimHandle) != HAL_OK) { ... } /*##-2- Configure the Output Compare channels #########################################*/ /* Output Compare Toggle Mode configuration: Channel1 */ sConfig.OCMode = TIM_OCMODE_TOGGLE; sConfig.Pulse = uhCCR1_Val; sConfig.OCPolarity = TIM_OCPOLARITY_LOW; if(HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK) { /* Configuration Error */ Error_Handler(); }if (HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK) { ... } /* Output Compare Toggle Mode configuration: Channel2 */ sConfig.Pulse = uhCCR2_Val; if(HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2) != HAL_OK) { /* Configuration Error */ Error_Handler(); }if (HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2) != HAL_OK) { ... } /* Output Compare Toggle Mode configuration: Channel3 */ sConfig.Pulse = uhCCR3_Val; if(HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3) != HAL_OK) { /* Configuration Error */ Error_Handler(); }if (HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3) != HAL_OK) { ... } /* Output Compare Toggle Mode configuration: Channel4 */ sConfig.Pulse = uhCCR4_Val; if(HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_4) != HAL_OK) { /* Configuration Error */ Error_Handler(); }if (HAL_TIM_OC_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_4) != HAL_OK) { ... } /*##-3- Start signals generation #######################################*/ /* Start channel 1 in Output compare mode */ if(HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_1) != HAL_OK) { /* Starting Error */ Error_Handler(); }if (HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_1) != HAL_OK) { ... } /* Start channel 2 in Output compare mode */ if(HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_2) != HAL_OK) { /* Starting Error */ Error_Handler(); }if (HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_2) != HAL_OK) { ... } /* Start channel 3 in Output compare mode */ if(HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_3) != HAL_OK) { /* Starting Error */ Error_Handler(); }if (HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_3) != HAL_OK) { ... } /* Start channel 4 in Output compare mode */ if(HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_4) != HAL_OK) { /* Starting Error */ Error_Handler(); }if (HAL_TIM_OC_Start_IT(&TimHandle, TIM_CHANNEL_4) != HAL_OK) { ... } /* Infinite loop */ while (1) { }while (1) { ... } }{ ... } /** * @brief Output Compare callback in non blocking mode * @param htim : TIM OC handle * @retval None *//* ... */ void HAL_TIM_OC_DelayElapsedCallback(TIM_HandleTypeDef *htim) { /* TIM3_CH1 toggling with frequency = 256.35 Hz */ if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) { uhCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1); /* Set the Capture Compare Register value */ __HAL_TIM_SET_COMPARE(&TimHandle, TIM_CHANNEL_1, (uhCapture + uhCCR1_Val)); }if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) { ... } /* TIM3_CH2 toggling with frequency = 256.35 Hz */ if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2) { uhCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2); /* Set the Capture Compare Register value */ __HAL_TIM_SET_COMPARE(&TimHandle, TIM_CHANNEL_2, (uhCapture + uhCCR2_Val)); }if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2) { ... } /* TIM3_CH3 toggling with frequency = 256.35 Hz */ if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_3) { uhCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_3); /* Set the Capture Compare Register value */ __HAL_TIM_SET_COMPARE(&TimHandle, TIM_CHANNEL_3, (uhCapture + uhCCR3_Val)); }if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_3) { ... } /* TIM3_CH4 toggling with frequency = 256.35 Hz */ if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_4) { uhCapture = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_4); /* Set the Capture Compare Register value */ __HAL_TIM_SET_COMPARE(&TimHandle, TIM_CHANNEL_4, (uhCapture + uhCCR4_Val)); }if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_4) { ... } }{ ... } /** * @brief This function is executed in case of error occurrence. * @param None * @retval None *//* ... */ static void Error_Handler(void) { /* Turn LED3 on */ BSP_LED_On(LED3); while(1) { }while (1) { ... } }{ ... } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 168000000 * HCLK(Hz) = 168000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 25000000 * PLL_M = 25 * PLL_N = 336 * PLL_P = 2 * PLL_Q = 7 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClock_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; /* Enable Power Control clock */ __HAL_RCC_PWR_CLK_ENABLE(); /* The voltage scaling allows optimizing the power consumption when the device is clocked below the maximum system frequency, to update the voltage scaling value regarding system frequency refer to product datasheet. *//* ... */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /* Enable HSE Oscillator and activate PLL with HSE as source */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 25; RCC_OscInitStruct.PLL.PLLN = 336; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; HAL_RCC_OscConfig(&RCC_OscInitStruct); /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers *//* ... */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5); /* STM32F405x/407x/415x/417x Revision Z and upper devices: prefetch is supported */ if (HAL_GetREVID() >= 0x1001) { /* Enable the Flash prefetch */ __HAL_FLASH_PREFETCH_BUFFER_ENABLE(); }if (HAL_GetREVID() >= 0x1001) { ... } }{ ... } #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) { }while (1) { ... } }assert_failed (uint8_t* file, uint32_t line) { ... } /* ... */#endif /** * @} *//* ... */ /** * @} *//* ... */
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