NUCLEO-L053R8 TIM定时器 PWM输出

TIM2 PWM输出测试

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　　今天给大伙分享一个TIM2 PWM输出小实验。

　　实验开发板：Nucleo-L053R8，即STM32L053R8T6。

　　开发环境：MDK5

图1 - 工程界面

　　本次实验测试的是通用定时器TIM2，PWM输出模式。

附上代码：

bsp_tim.h

 /**
   ******************************************************************************
   * File Name          : bsp_tim.h
   * Description        : This file provides code for the configuration
   *                      of the TIM instances.
   ******************************************************************************
   */
 #ifndef __BSP_TIM_H
 #define __BSP_TIM_H

 #include "stm32l0xx_hal.h"

 // 使用宏定义，代码易于移植

 #define        TIM_CH1_PORT        GPIOA
 #define     TIM_CH1_PIN            GPIO_PIN_0

 #define        TIM_x                TIM2
 #define        TIM_CHANNEL_x          TIM_CHANNEL_1
 #define        TIM_CLK_ENABLE        __HAL_RCC_TIM2_CLK_ENABLE()

 // PWM信号的频率 F = TIM_CLK/((ARR+1)*(PSC+1))
 #define        TIM_PSC                (1-1)
 #define        TIM_PERIOD            (200-1)
 #define        TIM_PULSE            100

 extern void _Error_Handler(void);
 void HAL_TIM2_Init(void);

 #endif /* __BSP_TIM_H  */

bsp_tim.c

 /**
   ******************************************************************************
   * File Name          : bsp_tim.c
   * Description        : This file provides code for the configuration
   *                      of the TIM instances.
   ******************************************************************************
   */

 #include "bsp_tim.h"

 static void HAL_TIM2_GPIO_Config(void)
 {
     GPIO_InitTypeDef GPIO_InitStruct;

     // TIM2_PWM输出GPIO初始化   PA0 ----> TIM2_CH1
     GPIO_InitStruct.Pin = TIM_CH1_PIN;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
     GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
     GPIO_InitStruct.Alternate = GPIO_AF2_TIM2;
     HAL_GPIO_Init(TIM_CH1_PORT, &GPIO_InitStruct);
 }

 static void HAL_TIM2_Mode_Config(void)
 {
     TIM_HandleTypeDef TIM_HandleStruct;
     TIM_MasterConfigTypeDef TIM_MasterStruct;
     TIM_OC_InitTypeDef TIM_OC_InitStruct;

     // 开启定时器时钟
     TIM_CLK_ENABLE;

     TIM_HandleStruct.Instance = TIM_x;
     TIM_HandleStruct.Init.Prescaler = TIM_PSC;
     TIM_HandleStruct.Init.CounterMode = TIM_COUNTERMODE_UP;
     TIM_HandleStruct.Init.Period = TIM_PERIOD;
     TIM_HandleStruct.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
     if (HAL_TIM_PWM_Init(&TIM_HandleStruct) != HAL_OK)
     {
         _Error_Handler();
     }

     TIM_MasterStruct.MasterOutputTrigger = TIM_TRGO_RESET;
     TIM_MasterStruct.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
     if (HAL_TIMEx_MasterConfigSynchronization(&TIM_HandleStruct, &TIM_MasterStruct) != HAL_OK)
     {
         _Error_Handler();
     }

     TIM_OC_InitStruct.OCMode = TIM_OCMODE_PWM1;
     TIM_OC_InitStruct.Pulse = TIM_PULSE;
     TIM_OC_InitStruct.OCPolarity = TIM_OCPOLARITY_HIGH;
     TIM_OC_InitStruct.OCFastMode = TIM_OCFAST_DISABLE;
     if (HAL_TIM_PWM_ConfigChannel(&TIM_HandleStruct, &TIM_OC_InitStruct, TIM_CHANNEL_x) != HAL_OK)
     {
         _Error_Handler();
     }

     HAL_TIM_PWM_Start(&TIM_HandleStruct, TIM_CHANNEL_x);
 }

 void HAL_TIM2_Init(void)
 {
     HAL_TIM2_GPIO_Config();
     HAL_TIM2_Mode_Config();
 }

main.c

 /**
   ******************************************************************************
   * @file    main.c
   * @author  Tuple
   * @brief   Main program body
   ******************************************************************************
   */

 #include "stm32l0xx_hal.h"
 #include "bsp_tim.h"

 void _Error_Handler(void);
 void SystemClock_Config(void);

 int main(void)
 {
     //重置所有外围设备，初始化Flash接口和Systick
     HAL_Init();

     //系统时钟配置
     SystemClock_Config();

     //TIM2 PWM输出配置
     HAL_TIM2_Init();

 }

 void SystemClock_Config(void)
 {
     RCC_OscInitTypeDef RCC_OscInitStruct;
     RCC_ClkInitTypeDef RCC_ClkInitStruct;

     //Configure the main internal regulator output voltage
     __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

     //Initializes the CPU, AHB and APB busses clocks
     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
     RCC_OscInitStruct.HSIState = RCC_HSI_ON;
     RCC_OscInitStruct.HSICalibrationValue = ;
     RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
     RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
     RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
     RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;
     if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
     {
         _Error_Handler();
     }

     //Initializes the CPU, AHB and APB busses clocks
     RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                 |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
     RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
     RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
     RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

     if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
     {
         _Error_Handler();
     }

     HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);

     //Configure the Systick interrupt time
     HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/);

     //Configure the Systick
     HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

     //SysTick_IRQn interrupt configuration
     HAL_NVIC_SetPriority(SysTick_IRQn, , );
 }

 void _Error_Handler()
 {
     while()
     {
     }
 }

　　如果你不清楚Nucleo板子上PA0在哪个引脚，请查阅RCC时钟配置实验的Figure 20  -->   Figure 20.NUCLEO-L053R8

　　用两根杜邦线从Nucleo板子上引出PA0、GND，然后用数字示波器来监控PWM输出。实物连接如下：

图2 - 实物连接图

　　把编译好的程序下载到Nucleo开发板，PWM输出设置成不同的占空比，用示波器监控 PWM输出的波形。下面给大伙展示3组不同占空比的PWM输出波形：

图3 - 占空比25%的PWM波形

图4 - 占空比50%的PWM波形

图5 - 占空比75%的PWM波形

　　附：工程源码（百度云）