IOT操作系统开发1
- 物联网操作系统的引入
- 主流物联网操作系统
- 前台代码结构存在的问题
- 物联网操作系统工作原理
- 物联网操作系统移植
- FREEROTS操作系统移植到STM32简单LED500ms闪烁代码
物联网操作系统的引入
1.所有的物联网操作系统都是由之前的嵌入式操作系统延伸而来 物联网操作系统包含嵌入式操作系统， 除了内核还有一些操作组件例如协议栈等，
2. 如何胜任使用物联网操作系统只需要了解内核的应用，原理弄清楚即可
3.操作系统一句话总结，对象（提供应用接口开发），提供硬件层面的管理（时钟外设等）
主流物联网操作系统
Ucosii& Ucosiii
官网：https://www.micrium.com/
FreeRTOS
官网：https://www.freertos.org/
VxWork
官网：http://www.windriver.com.cn/
国际嵌入式/物联网操作系统排行
国内操作系统
AliOS Things
官网：http://www.alios.cn/
HUWEI LiteOS
官网：http://www.alios.cn/
RT-Thred
官网：http://www.rt-thread.org
物联网操作系统如何选型
企业用人需求
前台代码结构存在的问题
之所以产生操作系统是因为裸机开发会产生一些问题
什么是前后台代码结构:
1.前台是指中断的处理函数
2.后台是指main函数
前后台代码存在的问题
问题的原因及解决方案
问题的原因
只有一个CPU，同一时刻智能处理一件事情，按照顺序进行执行
当系统中有很多事情要处理时，每个功能模块都存在相关联性
并行，用状态机，引入OS提供并行运行机制，多任务并发
物联网操作系统工作原理
物联网操作系统核心RTOS
什么是RTOS
RTOS全称为：Real Time OS，就是实时操作系统，强调的是：实时性。实时操作系统又分为硬实时和软实时。硬实时要求在规定的时间内必须完成操作 ，硬实时系统不允许超时，在软实时里面处理过程超时的后果就没有那么严格。
RTOS核心就是任务调度
RTOS工作原理
时间片抢占机制
RTOS特点
物联网操作系统移植
内存管理接口，硬件操作平台接口
GPIO配置高电平HIGHT
系统时钟配置最大选择外部时钟晶振
SYS选择SW开启串行总线接口选择TIM1定时器
选择第三方组件FREEROTS
任务名称函数名更改
FREEROTS操作系统移植到STM32简单LED500ms闪烁代码
main函数里不需要写任何函数，只需要在freertos.c里写即可.
/* USER CODE BEGIN Header */
/**
******************************************************************************
* File Name : freertos.c
* Description : Code for freertos applications
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2021 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Ultimate Liberty license
* SLA0044, the "License"; You may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* www.st.com/SLA0044
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "FreeRTOS.h"
#include "task.h"
#include "main.h"
#include "cmsis_os.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 ---------------------------------------------------------*/
/* USER CODE BEGIN Variables */
/* USER CODE END Variables */
/* Definitions for LedTask */
osThreadId_t LedTaskHandle;
const osThreadAttr_t LedTask_attributes = {
.name = "LedTask",
.priority = (osPriority_t) osPriorityNormal,
.stack_size = 128 * 4
};
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN FunctionPrototypes */
/* USER CODE END FunctionPrototypes */
void Led_Task(void *argument);
void MX_FREERTOS_Init(void); /* (MISRA C 2004 rule 8.1) */
/**
* @brief FreeRTOS initialization
* @param None
* @retval None
*/
void MX_FREERTOS_Init(void) {
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* USER CODE BEGIN RTOS_MUTEX */
/* add mutexes, ... */
/* USER CODE END RTOS_MUTEX */
/* USER CODE BEGIN RTOS_SEMAPHORES */
/* add semaphores, ... */
/* USER CODE END RTOS_SEMAPHORES */
/* 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 LedTask */
LedTaskHandle = osThreadNew(Led_Task, NULL, &LedTask_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 */
}
/* USER CODE BEGIN Header_Led_Task */
/**
* @brief Function implementing the LedTask thread.
* @param argument: Not used
* @retval None
*/
/* USER CODE END Header_Led_Task */
void Led_Task(void *argument)
{
/* USER CODE BEGIN Led_Task */
/* Infinite loop */
for(;;)
{
//GPIOF->BSRR=(1<<23);//点亮 库函数版HAL_GPIO_WritePin(GPIOF,GPIO_PIN_7,GPIO_PIN_RESET);
//GPIOF->BSRR=(1<<7);//熄灭 库函数版HAL_GPIO_WritePin(GPIOF,GPIO_PIN_7|GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10,GPIO_PIN_SET);
HAL_GPIO_WritePin(Led6_GPIO_Port, Led6_Pin, GPIO_PIN_RESET);
osDelay(500);//1ms时基
HAL_GPIO_WritePin(Led6_GPIO_Port, Led6_Pin, GPIO_PIN_SET);
osDelay(500);//1ms时基
}
/* USER CODE END Led_Task */
}
/* Private application code --------------------------------------------------*/
/* USER CODE BEGIN Application */
/* USER CODE END Application */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/main.c
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "cmsis_os.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 ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void MX_FREERTOS_Init(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();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Init scheduler */
osKernelInitialize(); /* Call init function for freertos objects (in freertos.c) */
MX_FREERTOS_Init();
/* 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_SCALE1);
/** 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_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 4;
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_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @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 */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
