基于物联网技术的智慧病房管理系统(二)—— RTOS、AHT20 与按钮功能实现

这里 RTOS 代码修改，AHT20 驱动代码移植可以参考前面博客内容：

STM32 —— IIC 读取 ATH20(DTH20)温度传感器
STM32 —— RT-Thread Nano 移植

这里主要介绍使用和按键相关内容

温湿度获取代码设计

首先我们需要引入温湿度驱动头文件：

#include "AHT20.h"

然后我们需要在进程中对温湿度传感器进行初始化，这里在初始化之后，不能立即获取温湿度，需要等待 2 秒或以上，确保数据正确性：

MX_GPIO_Init();
MX_I2C1_Init();
MX_USART1_UART_Init();
uint32_t CT_data[2]={0,0}; // 用于获取温湿度数据
volatile int  c1,t1;
rt_thread_delay(50);
AHT20_Init();
rt_thread_delay(2500);

然后我们需要获取经过 CRC 验证的温湿度数据，这里直接调用驱动函数即可：

while(1){AHT20_Read_CTdata_crc(CT_data);       //经过CRC校验，读取AHT20的温度和湿度数据    推荐每隔大于1S读一次c1 = CT_data[0]*1000/1024/1024;  //计算得到湿度值c1(放大了10倍)t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1(放大了10倍)printf("正在检测");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");printf("温度:%d%d.%d",t1/100,(t1/10)%10,t1%10); // 这里需要对温度进行计算后才能得到我们需要的温度值printf("湿度:%d%d.%d",c1/100,(c1/10)%10,c1%10); // 这里同样需要对适度进行计算printf("\r\n");printf("等待");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");}

RTOS 进程设计

首先新建 app_rt_thread.c 文件，然后引入头文件：

#include "rtthread.h"
#include "main.h"
#include "i2c.h"
#include "usart.h"
#include "gpio.h"
#include "stdio.h"
#include "AHT20.h"

然后我们需要设计进程，这里主进程先设置为串口发送，子进程设置两个，一个是获取温度参数，另一个是控制 PC13 引脚上的板载 LED ，后续会根据系统进程对进行设计：

//初始化线程函数
void MX_RT_Thread_Init(void)
{//初始化LED1线程rt_thread_init(&led1_thread,"led1",led1_task_entry,RT_NULL,&rt_led1_thread_stack[0],sizeof(rt_led1_thread_stack),3,20);//开启线程调度rt_thread_startup(&led1_thread);//初始化USART1线程rt_thread_init(&usart1_thread,"usart1",usart1_task_entry,RT_NULL,&rt_usart1_thread_stack[0],sizeof(rt_usart1_thread_stack),3,20);//开启线程调度rt_thread_startup(&usart1_thread);
}//主任务
void MX_RT_Thread_Process(void)
{printf("Hello RT_Thread!!!\r\n");rt_thread_delay(2000);
}//LED1任务
void led1_task_entry(void *parameter)
{while(1){HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13, GPIO_PIN_RESET);rt_thread_delay(500);HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13, GPIO_PIN_SET);rt_thread_delay(500);}
}
//读取温度任务
void usart1_task_entry(void *parameter)
{MX_GPIO_Init();MX_I2C1_Init();MX_USART1_UART_Init();uint32_t CT_data[2]={0,0};    //volatile int  c1,t1;rt_thread_delay(50);AHT20_Init();rt_thread_delay(2500);while(1){AHT20_Read_CTdata_crc(CT_data);       //经过CRC校验，读取AHT20的温度和湿度数据    推荐每隔大于1S读一次c1 = CT_data[0]*1000/1024/1024;  //计算得到湿度值c1(放大了10倍)t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1(放大了10倍)printf("正在检测");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");printf("温度:%d%d.%d",t1/100,(t1/10)%10,t1%10);  // 这里需要对温度进行计算后才能得到我们需要的温度值printf("湿度:%d%d.%d",c1/100,(c1/10)%10,c1%10); // 这里同样需要对适度进行计算printf("\r\n");printf("等待");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");}
}

这里直接给出完整代码如下：

点击查看完整 app_rt_thread.c 代码

#include "rtthread.h"
#include "main.h"
#include "i2c.h"
#include "usart.h"
#include "gpio.h"
#include "stdio.h"
#include "AHT20.h"struct rt_thread led1_thread;
struct rt_thread usart1_thread;
rt_uint8_t rt_led1_thread_stack[128];
rt_uint8_t rt_usart1_thread_stack[256];
void led1_task_entry(void *parameter);
void usart1_task_entry(void *parameter);int fputc(int ch,FILE *f)
{HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,0xFFFF);    //等待发送结束    while(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_TC)!=SET){}        return ch;
}//初始化线程函数
void MX_RT_Thread_Init(void)
{//初始化LED1线程rt_thread_init(&led1_thread,"led1",led1_task_entry,RT_NULL,&rt_led1_thread_stack[0],sizeof(rt_led1_thread_stack),3,20);//开启线程调度rt_thread_startup(&led1_thread);//初始化USART1线程rt_thread_init(&usart1_thread,"usart1",usart1_task_entry,RT_NULL,&rt_usart1_thread_stack[0],sizeof(rt_usart1_thread_stack),3,20);//开启线程调度rt_thread_startup(&usart1_thread);
}//主任务
void MX_RT_Thread_Process(void)
{printf("Hello RT_Thread!!!\r\n");rt_thread_delay(2000);
}//LED1任务
void led1_task_entry(void *parameter)
{while(1){HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13, GPIO_PIN_RESET);rt_thread_delay(500);HAL_GPIO_WritePin(GPIOC,GPIO_PIN_13, GPIO_PIN_SET);rt_thread_delay(500);}
}
//读取温度任务
void usart1_task_entry(void *parameter)
{MX_GPIO_Init();MX_I2C1_Init();MX_USART1_UART_Init();uint32_t CT_data[2]={0,0};    //volatile int  c1,t1;rt_thread_delay(50);AHT20_Init();rt_thread_delay(2500);while(1){AHT20_Read_CTdata_crc(CT_data);       //经过CRC校验，读取AHT20的温度和湿度数据    推荐每隔大于1S读一次c1 = CT_data[0]*1000/1024/1024;  //计算得到湿度值c1(放大了10倍)t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1(放大了10倍)printf("正在检测");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");printf("温度:%d%d.%d",t1/100,(t1/10)%10,t1%10);  // 这里需要对温度进行计算后才能得到我们需要的温度值printf("湿度:%d%d.%d",c1/100,(c1/10)%10,c1%10); // 这里同样需要对适度进行计算printf("\r\n");printf("等待");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");rt_thread_delay(100);printf(".");printf("\r\n");}
}

然后我们在主函数中引入 RT-Thread 必要的头文件并引用函数：

#include "rtthread.h"extern void MX_RT_Thread_Init(void);
extern void MX_RT_Thread_Process(void);

最后我们直接在主函数中对进程进行初始化，并运行即可，这里直接给出完整主函数：

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_I2C1_Init();MX_TIM3_Init();MX_USART1_UART_Init();MX_TIM2_Init();/* USER CODE BEGIN 2 */MX_RT_Thread_Init(); // 初始化线程/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){MX_RT_Thread_Process();    // 执行主进程/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}

按钮的使用与消抖

首先我们设计按钮在 PA3 引脚，然后在设置 PA4 引脚上外接一个 LED ，这里先令按钮按下反转 PA4 引脚电平，即按下小灯泡点亮，再次按下，小灯泡熄灭，这里直接设计为一个新进程：

struct rt_thread btnclick_thread;
rt_uint8_t rt_btnclick_thread_stack[128];
void btnclick_task_entry(void *parameter);void btnclick_task_entry(void *parameter){while(1){switch(KEY_Scan(0)){                case KEY1_PRES:    HAL_GPIO_TogglePin(GPIOA,GPIO_PIN_4);break;default:break;}}
}

初始化线程：

//初始化线程
rt_thread_init(&btnclick_thread,"btnclick",btnclick_task_entry,RT_NULL,&rt_btnclick_thread_stack[0],sizeof(rt_btnclick_thread_stack),3,20);
//开启线程调度
rt_thread_startup(&btnclick_thread);

但是我们不进行按键消抖，这里按键非常容易误触，所以这里进行按键消抖：

#define KEY1  HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_3)    //读取按键1
#define KEY1_PRES 1     //KEY1按下
uint8_t KEY_Scan(uint8_t mode)
{static uint8_t key_up=1;//按键松开标志位if(key_up&&(KEY1==0)){HAL_Delay(10);//去抖动key_up=0;if(KEY1==0)return KEY1_PRES;}else if(KEY1==1)key_up=1;return 0;//无按键按下
}

这样我们就完成了对 RTOS 移植，AHT20 温湿度数据获取和按键功能的实现。