1. 配置STM32CubeMX

前面的一些基礎(chǔ)步驟可參見：【STM32】CubeMX+HAL 點亮LED 的【1.1】~【1.6】步驟。

核心配置：

這里我使用的是 TIM2 定時器，當(dāng)然使用其他的也可以，但要注意相關(guān)配置。

1.1 TIM2 的 Mode 配置

1.2 TIM2 的 Configuration 配置

1.3 其余 GPIO 配置

PA2 的 PWM 輸出作為 PA6 的輸入，PA6 連接的是一個 LED ，觀察是否出現(xiàn)呼吸燈現(xiàn)象。

余下步驟可參見：【STM32】CubeMX+HAL 點亮LED 的【1.10】~【1.13】步驟。

2. 添加代碼

下面貼出主要代碼：

2.1 gpio.c

/**

  ******************************************************************************

  * File Name          : gpio.c

  * Description        : This file provides code for the configuration

  *                      of all used GPIO pins.

  ******************************************************************************

  * @attention

  *

  *

© Copyright (c) 2020 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 "gpio.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/*----------------------------------------------------------------------------*/

/* Configure GPIO                                                             */

/*----------------------------------------------------------------------------*/

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/** Configure pins as 

        * Analog 

        * Input 

        * Output

        * EVENT_OUT

        * EXTI

*/

void MX_GPIO_Init(void)

{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */

  __HAL_RCC_GPIOC_CLK_ENABLE();

  __HAL_RCC_GPIOH_CLK_ENABLE();

  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin : PA6 */

  GPIO_InitStruct.Pin = GPIO_PIN_6;

  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

  GPIO_InitStruct.Pull = GPIO_NOPULL;

  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

/* USER CODE BEGIN 2 */

/* USER CODE END 2 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

2.2 time.c

/**

  ******************************************************************************

  * File Name          : TIM.c

  * Description        : This file provides code for the configuration

  *                      of the TIM instances.

  ******************************************************************************

  * @attention

  *

  *

© Copyright (c) 2020 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 "tim.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

TIM_HandleTypeDef htim2;

/* TIM2 init function */

void MX_TIM2_Init(void)

{

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};

  TIM_MasterConfigTypeDef sMasterConfig = {0};

  TIM_OC_InitTypeDef sConfigOC = {0};

  htim2.Instance = TIM2;

  htim2.Init.Prescaler = 80-1;

  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

  htim2.Init.Period = 100;

  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)

  {

    Error_Handler();

  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)

  {

    Error_Handler();

  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)

  {

    Error_Handler();

  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;

  sConfigOC.Pulse = 0;

  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;

  if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)

  {

    Error_Handler();

  }

  HAL_TIM_MspPostInit(&htim2);

}

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)

{

  if(tim_baseHandle->Instance==TIM2)

  {

  /* USER CODE BEGIN TIM2_MspInit 0 */

  /* USER CODE END TIM2_MspInit 0 */

    /* TIM2 clock enable */

    __HAL_RCC_TIM2_CLK_ENABLE();

  /* USER CODE BEGIN TIM2_MspInit 1 */

  /* USER CODE END TIM2_MspInit 1 */

  }

}

void HAL_TIM_MspPostInit(TIM_HandleTypeDef* timHandle)

{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  if(timHandle->Instance==TIM2)

  {

  /* USER CODE BEGIN TIM2_MspPostInit 0 */

  /* USER CODE END TIM2_MspPostInit 0 */

    __HAL_RCC_GPIOA_CLK_ENABLE();

    /**TIM2 GPIO Configuration    

    PA2     ------> TIM2_CH3 

    */

    GPIO_InitStruct.Pin = GPIO_PIN_2;

    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

    GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN TIM2_MspPostInit 1 */

  /* USER CODE END TIM2_MspPostInit 1 */

  }

}

void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)

{

  if(tim_baseHandle->Instance==TIM2)

  {

  /* USER CODE BEGIN TIM2_MspDeInit 0 */

  /* USER CODE END TIM2_MspDeInit 0 */

    /* Peripheral clock disable */

    __HAL_RCC_TIM2_CLK_DISABLE();

  /* USER CODE BEGIN TIM2_MspDeInit 1 */

  /* USER CODE END TIM2_MspDeInit 1 */

  }

} 

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

2.3 main.c

/* USER CODE BEGIN Header */

/**

  ******************************************************************************

  * @file           : main.c

  * @brief          : Main program body

  ******************************************************************************

  * @attention

  *

  *

© Copyright (c) 2020 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

  *

  ******************************************************************************

  */

/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

#include "tim.h"

#include "gpio.h"

/* Private includes ----------------------------------------------------------*/

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/

/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/

/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

static unsigned char counter=0;

static unsigned char flag=0;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/

void SystemClock_Config(void);

/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**

  * @brief  The application entry point.

  * @retval int

  */

int main(void)

{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */

  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */

  MX_GPIO_Init();

  MX_TIM2_Init();

  /* USER CODE BEGIN 2 */

HAL_TIM_Base_Start(&htim2);