/** ****************************************************************************** * @file TIM/TIM_PWMOutput/Src/main.c * @author MCD Application Team * @brief This sample code shows how to use STM32F1xx TIM HAL API to generate * 4 signals in PWM. ****************************************************************************** * @attention * *

© Copyright (c) 2016 STMicroelectronics. * All rights reserved.

* * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /** @addtogroup STM32F1xx_HAL_Examples * @{ */ /** @addtogroup TIM_PWMOutput * @{ */ /* Private typedef -----------------------------------------------------------*/ #define PERIOD_VALUE (uint32_t)(700 - 1) /* Period Value */ #define PULSE1_VALUE (uint32_t)(PERIOD_VALUE/2) /* Capture Compare 1 Value */ #define PULSE2_VALUE (uint32_t)(PERIOD_VALUE*37.5/100) /* Capture Compare 2 Value */ #define PULSE3_VALUE (uint32_t)(PERIOD_VALUE/4) /* Capture Compare 3 Value */ #define PULSE4_VALUE (uint32_t)(PERIOD_VALUE*12.5/100) /* Capture Compare 4 Value */ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Timer handler declaration */ TIM_HandleTypeDef TimHandle; /* Timer Output Compare Configuration Structure declaration */ TIM_OC_InitTypeDef sConfig; /* Counter Prescaler value */ uint32_t uhPrescalerValue = 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) { /* STM32F103xG 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 72 MHz */ SystemClock_Config(); /* Configure LED3 */ BSP_LED_Init(LED3); /* Compute the prescaler value to have TIM2 counter clock equal to 2000000 Hz */ uhPrescalerValue = (uint32_t)(SystemCoreClock / 2000000) - 1; /*##-1- Configure the TIM peripheral #######################################*/ /* ----------------------------------------------------------------------- TIM2 Configuration: generate 4 PWM signals with 4 different duty cycles. In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1) x2, since APB1 prescaler is set to 4 (0x100). TIM2CLK = PCLK1*2 PCLK1 = HCLK/2 => TIM2CLK = PCLK1*2 = (HCLK/2)*2 = HCLK = SystemCoreClock To get TIM2 counter clock at 2.1 MHz, the prescaler is computed as follows: Prescaler = (TIM2CLK / TIM2 counter clock) - 1 Prescaler = ((SystemCoreClock) /2.1 MHz) - 1 To get TIM2 output clock at 3 KHz, the period (ARR)) is computed as follows: ARR = (TIM2 counter clock / TIM2 output clock) - 1 = 699 TIM2 Channel1 duty cycle = (TIM2_CCR1/ TIM2_ARR + 1)* 100 = 50% TIM2 Channel2 duty cycle = (TIM2_CCR2/ TIM2_ARR + 1)* 100 = 37.5% TIM2 Channel3 duty cycle = (TIM2_CCR3/ TIM2_ARR + 1)* 100 = 25% TIM2 Channel4 duty cycle = (TIM2_CCR4/ TIM2_ARR + 1)* 100 = 12.5% 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 ----------------------------------------------------------------------- */ /* Initialize TIMx peripheral as follows: + Prescaler = (SystemCoreClock / 2000000) - 1 + Period = (700 - 1) + ClockDivision = 0 + Counter direction = Up */ TimHandle.Instance = TIMx; TimHandle.Init.Prescaler = uhPrescalerValue; TimHandle.Init.Period = PERIOD_VALUE; TimHandle.Init.ClockDivision = 0; TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; TimHandle.Init.RepetitionCounter = 0; TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) { /* Initialization Error */ Error_Handler(); } /*##-2- Configure the PWM channels #########################################*/ /* Common configuration for all channels */ sConfig.OCMode = TIM_OCMODE_PWM1; sConfig.OCPolarity = TIM_OCPOLARITY_HIGH; sConfig.OCFastMode = TIM_OCFAST_DISABLE; sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH; sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET; sConfig.OCIdleState = TIM_OCIDLESTATE_RESET; /* Set the pulse value for channel 1 */ sConfig.Pulse = PULSE1_VALUE; if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK) { /* Configuration Error */ Error_Handler(); } /* Set the pulse value for channel 2 */ sConfig.Pulse = PULSE2_VALUE; if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2) != HAL_OK) { /* Configuration Error */ Error_Handler(); } /* Set the pulse value for channel 3 */ sConfig.Pulse = PULSE3_VALUE; if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3) != HAL_OK) { /* Configuration Error */ Error_Handler(); } /* Set the pulse value for channel 4 */ sConfig.Pulse = PULSE4_VALUE; if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_4) != HAL_OK) { /* Configuration Error */ Error_Handler(); } /*##-3- Start PWM signals generation #######################################*/ /* Start channel 1 */ if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1) != HAL_OK) { /* PWM Generation Error */ Error_Handler(); } /* Start channel 2 */ if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2) != HAL_OK) { /* PWM Generation Error */ Error_Handler(); } /* Start channel 3 */ if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_3) != HAL_OK) { /* PWM generation Error */ Error_Handler(); } /* Start channel 4 */ if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_4) != HAL_OK) { /* PWM generation Error */ Error_Handler(); } while (1) { } } /** * @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) { } } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 72000000 * HCLK(Hz) = 72000000 * AHB Prescaler = 1 * APB1 Prescaler = 2 * APB2 Prescaler = 1 * HSE Frequency(Hz) = 8000000 * HSE PREDIV1 = 1 * PLLMUL = 9 * Flash Latency(WS) = 2 * @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_DIV1; oscinitstruct.PLL.PLLState = RCC_PLL_ON; oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9; 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); } } #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****/