303 lines
9.7 KiB
C
303 lines
9.7 KiB
C
/**
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******************************************************************************
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* @file TIM/TIM_PWMOutput/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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* 4 signals in PWM.
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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_PWMOutput
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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#define PERIOD_VALUE (uint32_t)(700 - 1) /* Period Value */
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#define PULSE1_VALUE (uint32_t)(PERIOD_VALUE/2) /* Capture Compare 1 Value */
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#define PULSE2_VALUE (uint32_t)(PERIOD_VALUE*37.5/100) /* Capture Compare 2 Value */
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#define PULSE3_VALUE (uint32_t)(PERIOD_VALUE/4) /* Capture Compare 3 Value */
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#define PULSE4_VALUE (uint32_t)(PERIOD_VALUE*12.5/100) /* Capture Compare 4 Value */
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Timer handler declaration */
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TIM_HandleTypeDef TimHandle;
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/* Timer Output Compare Configuration Structure declaration */
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TIM_OC_InitTypeDef sConfig;
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/* Counter Prescaler value */
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uint32_t uhPrescalerValue = 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 */
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BSP_LED_Init(LED3);
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/* Compute the prescaler value to have TIM2 counter clock equal to 2000000 Hz */
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uhPrescalerValue = (uint32_t)(SystemCoreClock / 2000000) - 1;
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/*##-1- Configure the TIM peripheral #######################################*/
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/* -----------------------------------------------------------------------
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TIM2 Configuration: generate 4 PWM signals with 4 different duty cycles.
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In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1) x2,
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since APB1 prescaler is set to 4 (0x100).
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TIM2CLK = PCLK1*2
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PCLK1 = HCLK/2
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=> TIM2CLK = PCLK1*2 = (HCLK/2)*2 = HCLK = SystemCoreClock
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To get TIM2 counter clock at 2.1 MHz, the prescaler is computed as follows:
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Prescaler = (TIM2CLK / TIM2 counter clock) - 1
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Prescaler = ((SystemCoreClock) /2.1 MHz) - 1
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To get TIM2 output clock at 3 KHz, the period (ARR)) is computed as follows:
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ARR = (TIM2 counter clock / TIM2 output clock) - 1
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= 699
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TIM2 Channel1 duty cycle = (TIM2_CCR1/ TIM2_ARR + 1)* 100 = 50%
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TIM2 Channel2 duty cycle = (TIM2_CCR2/ TIM2_ARR + 1)* 100 = 37.5%
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TIM2 Channel3 duty cycle = (TIM2_CCR3/ TIM2_ARR + 1)* 100 = 25%
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TIM2 Channel4 duty cycle = (TIM2_CCR4/ TIM2_ARR + 1)* 100 = 12.5%
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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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/* Initialize TIMx peripheral as follows:
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+ Prescaler = (SystemCoreClock / 2000000) - 1
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+ Period = (700 - 1)
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+ ClockDivision = 0
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+ Counter direction = Up
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*/
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TimHandle.Instance = TIMx;
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TimHandle.Init.Prescaler = uhPrescalerValue;
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TimHandle.Init.Period = PERIOD_VALUE;
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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_PWM_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- Configure the PWM channels #########################################*/
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/* Common configuration for all channels */
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sConfig.OCMode = TIM_OCMODE_PWM1;
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sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
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sConfig.OCFastMode = TIM_OCFAST_DISABLE;
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sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
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sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
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/* Set the pulse value for channel 1 */
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sConfig.Pulse = PULSE1_VALUE;
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/* Set the pulse value for channel 2 */
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sConfig.Pulse = PULSE2_VALUE;
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/* Set the pulse value for channel 3 */
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sConfig.Pulse = PULSE3_VALUE;
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/* Set the pulse value for channel 4 */
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sConfig.Pulse = PULSE4_VALUE;
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_4) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/*##-3- Start PWM signals generation #######################################*/
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/* Start channel 1 */
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if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1) != HAL_OK)
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{
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/* PWM Generation Error */
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Error_Handler();
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}
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/* Start channel 2 */
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if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2) != HAL_OK)
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{
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/* PWM Generation Error */
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Error_Handler();
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}
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/* Start channel 3 */
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if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_3) != HAL_OK)
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{
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/* PWM generation Error */
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Error_Handler();
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}
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/* Start channel 4 */
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if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_4) != HAL_OK)
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{
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/* PWM generation 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 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 LED3 on */
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BSP_LED_On(LED3);
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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 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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#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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