STM32CUBEIDE FreeRTOS操作教程（十）：interrupt on/off中断开关
STM32CUBE开发环境集成了STM32 HAL库进行FreeRTOS配置和开发的组件，不需要用户自己进行FreeRTOS的移植。这里介绍最简化的用户操作类应用教程。以STM32F401RCT6开发板为例，只用到USB，USART1极少的接口，体现FreeRTOS的各种操作过程。
操作教程（十）配置FreeRTOS及相关环境，通过软件定时器的中断响应，对LED管脚的输出翻转，实现LED的闪灯，又通过任务里实现的中断的开关，控制LED的一段时间常亮，和一段时间的闪灯。这里也在任务里用到了**指令式微秒延时函数**。
FreeRTOS的教程较多，推荐参考正点原子所出的《STM32F407 FreeRTOS开发手册》了解相关知识。
STM32CUBEIDE工程配置
选择TIM1(也可以是其它TIM)作为FreeRTOS操作系统占用的时钟源：
配置时钟树包括USB的48MHz时钟：
配置PC13为低电平点灯的管脚：
配置USB串口:
配置UART1串口（但本例中不用到UART1):
FreeRTOS配置
保存并生成基础工程代码：
在生成代码的这个部分可以看到FreeRTOS代码部分：
任务实现
USB接口收到串口数据时，保存数据和数据长度，任务里发现数据长度非0，则将数据从USB串口发送出去。这部分前面的操作教程已经介绍过，非本篇的主要介绍部分。
软件定时器中断里，进行LED控制管脚的输出翻转：
void LED_Timer01_Callback01(void *argument)
{
/* USER CODE BEGIN LED_Timer01_Callback01 */
HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
/* USER CODE END LED_Timer01_Callback01 */
}
在启动任务里，开启软件定时器中断：
void StartDefaultTask(void *argument)
{
/* init code for USB_DEVICE */
MX_USB_DEVICE_Init();
xTimerChangePeriodFromISR( LED_Timer01Handle, Timer_Period_ms, &LED_pxHigherPriorityTaskWaken );
xTimerStart( LED_Timer01Handle, LED_VCOM_xBlockTime );
/* USER CODE BEGIN 5 */
/* Infinite loop */
for(;;)
{
osDelay(10);
}
/* USER CODE END 5 */
}
LED控制任务代码里，体现了操作系统的1ms基准的调度延时，和1us基准的指令式微秒延时函数：
void StartTask_TASK_LED_FLASH(void *argument)
{
/* USER CODE BEGIN StartTask_TASK_LED_FLASH */
/* Infinite loop */
for(;;)
{
osDelay(6500);
portDISABLE_INTERRUPTS();
PY_Delay_us_t(5000000); //5S Delay
portENABLE_INTERRUPTS();
}
/* USER CODE END StartTask_TASK_LED_FLASH */
}
完整的main.c文件：
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 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.
*
******************************************************************************
*/
//Example 10: LED flash + interrupt on/off
//Written by Pegasus Yu
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "cmsis_os.h"
#include "usb_device.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "timers.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
__IO float usDelayBase = 7.63238716; //For STM32F401RCT6 working in 84MHz main clock
void PY_Delay_us_t(uint32_t Delay)
{
__IO uint32_t delayReg;
__IO uint32_t usNum = (uint32_t)(Delay*usDelayBase);
delayReg = 0;
while(delayReg!=usNum) delayReg++;
}
/* 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 ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
DMA_HandleTypeDef hdma_usart1_rx;
/* Definitions for defaultTask */
osThreadId_t defaultTaskHandle;
const osThreadAttr_t defaultTask_attributes = {
.name = "defaultTask",
.stack_size = 128 * 4,
.priority = (osPriority_t) osPriorityNormal,
};
/* Definitions for TASK_LED_FLASH */
osThreadId_t TASK_LED_FLASHHandle;
const osThreadAttr_t TASK_LED_FLASH_attributes = {
.name = "TASK_LED_FLASH",
.stack_size = 128 * 4,
.priority = (osPriority_t) osPriorityLow,
};
/* Definitions for TASK_UART1 */
osThreadId_t TASK_UART1Handle;
const osThreadAttr_t TASK_UART1_attributes = {
.name = "TASK_UART1",
.stack_size = 128 * 4,
.priority = (osPriority_t) osPriorityLow,
};
/* Definitions for TASK_USB_VCOM */
osThreadId_t TASK_USB_VCOMHandle;
const osThreadAttr_t TASK_USB_VCOM_attributes = {
.name = "TASK_USB_VCOM",
.stack_size = 128 * 4,
.priority = (osPriority_t) osPriorityLow,
};
/* Definitions for LED_Timer01 */
osTimerId_t LED_Timer01Handle;
const osTimerAttr_t LED_Timer01_attributes = {
.name = "LED_Timer01"
};
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART1_UART_Init(void);
void StartDefaultTask(void *argument);
void StartTask_TASK_LED_FLASH(void *argument);
void StartTask_TASK_UART1(void *argument);
void StartTask_TASK_USB_VCOM(void *argument);
void LED_Timer01_Callback01(void *argument);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len);
void usbprintstring(char * data)
{
if(CDC_Transmit_FS((uint8_t *)data, strlen(data))==USBD_BUSY)
{
PY_Delay_us_t(1000000);
CDC_Transmit_FS((uint8_t *)data, strlen(data));
}
}
void usbprintarray(uint8_t * data, uint16_t len)
{
if(CDC_Transmit_FS(data, len)==USBD_BUSY)
{
PY_Delay_us_t(1000000);
CDC_Transmit_FS(data, len);
}
}
uint8_t USB_VCOM_BUFF[1024];
uint32_t USB_VCOM_INDEX = 0;
BaseType_t LED_pxHigherPriorityTaskWaken = 0;
TickType_t LED_VCOM_xBlockTime = 0;
uint32_t Timer_Period_ms = 1000;
/* 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_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Init scheduler */
osKernelInitialize();
/* USER CODE BEGIN RTOS_MUTEX */
/* add mutexes, ... */
/* USER CODE END RTOS_MUTEX */
/* USER CODE BEGIN RTOS_SEMAPHORES */
/* add semaphores, ... */
/* USER CODE END RTOS_SEMAPHORES */
/* Create the timer(s) */
/* creation of LED_Timer01 */
LED_Timer01Handle = osTimerNew(LED_Timer01_Callback01, osTimerPeriodic, NULL, &LED_Timer01_attributes);
/* USER CODE BEGIN RTOS_TIMERS */
/* start timers, add new ones, ... */
/* USER CODE END RTOS_TIMERS */
/* USER CODE BEGIN RTOS_QUEUES */
/* add queues, ... */
/* USER CODE END RTOS_QUEUES */
/* Create the thread(s) */
/* creation of defaultTask */
defaultTaskHandle = osThreadNew(StartDefaultTask, NULL, &defaultTask_attributes);
/* creation of TASK_LED_FLASH */
TASK_LED_FLASHHandle = osThreadNew(StartTask_TASK_LED_FLASH, NULL, &TASK_LED_FLASH_attributes);
/* creation of TASK_UART1 */
TASK_UART1Handle = osThreadNew(StartTask_TASK_UART1, NULL, &TASK_UART1_attributes);
/* creation of TASK_USB_VCOM */
TASK_USB_VCOMHandle = osThreadNew(StartTask_TASK_USB_VCOM, NULL, &TASK_USB_VCOM_attributes);
/* USER CODE BEGIN RTOS_THREADS */
/* add threads, ... */
/* USER CODE END RTOS_THREADS */
/* USER CODE BEGIN RTOS_EVENTS */
/* add events, ... */
/* USER CODE END RTOS_EVENTS */
/* Start scheduler */
osKernelStart();
/* We should never get here as control is now taken by the scheduler */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
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_DIV4;
RCC_OscInitStruct.PLL.PLLQ = 7;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses 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_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief USART1 Initialization Function
* @param None
* @retval None
*/
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART1_Init 2 */
/* USER CODE END USART1_Init 2 */
}
/**
* Enable DMA controller clock
*/
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA2_CLK_ENABLE();
/* DMA interrupt init */
/* DMA2_Stream2_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Stream2_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream2_IRQn);
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : LED_Pin */
GPIO_InitStruct.Pin = LED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/* USER CODE BEGIN Header_StartDefaultTask */
/**
* @brief Function implementing the defaultTask thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartDefaultTask */
void StartDefaultTask(void *argument)
{
/* init code for USB_DEVICE */
MX_USB_DEVICE_Init();
xTimerChangePeriodFromISR( LED_Timer01Handle, Timer_Period_ms, &LED_pxHigherPriorityTaskWaken );
xTimerStart( LED_Timer01Handle, LED_VCOM_xBlockTime );
/* USER CODE BEGIN 5 */
/* Infinite loop */
for(;;)
{
osDelay(10);
}
/* USER CODE END 5 */
}
/* USER CODE BEGIN Header_StartTask_TASK_LED_FLASH */
/**
* @brief Function implementing the TASK_LED_FLASH thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTask_TASK_LED_FLASH */
void StartTask_TASK_LED_FLASH(void *argument)
{
/* USER CODE BEGIN StartTask_TASK_LED_FLASH */
/* Infinite loop */
for(;;)
{
osDelay(6500);
portDISABLE_INTERRUPTS();
PY_Delay_us_t(5000000); //5S Delay
portENABLE_INTERRUPTS();
}
/* USER CODE END StartTask_TASK_LED_FLASH */
}
/* USER CODE BEGIN Header_StartTask_TASK_UART1 */
/**
* @brief Function implementing the TASK_UART1 thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTask_TASK_UART1 */
void StartTask_TASK_UART1(void *argument)
{
/* USER CODE BEGIN StartTask_TASK_UART1 */
/* Infinite loop */
for(;;)
{
osDelay(1);
}
/* USER CODE END StartTask_TASK_UART1 */
}
/* USER CODE BEGIN Header_StartTask_TASK_USB_VCOM */
/**
* @brief Function implementing the TASK_USB_VCOM thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_StartTask_TASK_USB_VCOM */
void StartTask_TASK_USB_VCOM(void *argument)
{
/* USER CODE BEGIN StartTask_TASK_USB_VCOM */
/* Infinite loop */
for(;;)
{
osDelay(10);
if(USB_VCOM_INDEX!=0)
{
CDC_Transmit_FS(USB_VCOM_BUFF, USB_VCOM_INDEX);
USB_VCOM_INDEX = 0;
}
}
/* USER CODE END StartTask_TASK_USB_VCOM */
}
/* LED_Timer01_Callback01 function */
void LED_Timer01_Callback01(void *argument)
{
/* USER CODE BEGIN LED_Timer01_Callback01 */
HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
/* USER CODE END LED_Timer01_Callback01 */
}
/**
* @brief Period elapsed callback in non blocking mode
* @note This function is called when TIM1 interrupt took place, inside
* HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
* a global variable "uwTick" used as application time base.
* @param htim : TIM handle
* @retval None
*/
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
/* USER CODE BEGIN Callback 0 */
/* USER CODE END Callback 0 */
if (htim->Instance == TIM1) {
HAL_IncTick();
}
/* USER CODE BEGIN Callback 1 */
/* USER CODE END Callback 1 */
}
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#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 CODE BEGIN 6 */
/* 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) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
例程测试
例程下载
STM32CUBEIDE FreeRTOS操作教程（十）：interrupt on/off中断开关 例程
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