15.rtthread之文件系统

1.概述

使用文件系统存储传感器的数据。

2.步骤

1. 挂载SD卡
2. 获取温湿度数据
3. 在创建SD卡中创建文件，保存数据
4. 将异常温湿度数据保存到SD文件中

3.关键步骤

1.SD卡热插拔处理

void FlieSystem_entry(void *parameter) { static rt_err_t result; rt_device_t dev; while(1) { dev = rt_device_find("sd0"); if (dev != RT_NULL) { if (dfs_mount("sd0", "/", "elm", 0, 0) == RT_EOK) { rt_kprintf("SD mount to / success\n"); break; } else { rt_kprintf("SD mount to / failed\n"); } } rt_thread_mdelay(500); } } static int FileSystemInit(void) { //创建sd线程 rt_thread_t thread_filesystem = rt_thread_create("file_sys", FlieSystem_entry, RT_NULL, 1024, 18, 20); if (thread_filesystem != RT_NULL) { rt_thread_startup(thread_filesystem); } } INIT_ENV_EXPORT(FileSystemInit);

2.传感器数据发送

使用邮箱或者消息队列

3.文件读写

//保存数据到SD void Sensor_DataTo_SD(char* buff) { /* 以创建和读写模式打开 /text.txt 文件，如果该文件不存在则创建该文件 */ FILE *recvdata_p0; recvdata_p0 = fopen("/Sensor_Data.cav", "a+"); if (recvdata_p0 != RT_NULL) { fputs(buff, recvdata_p0); fputs("\n", recvdata_p0); fclose(recvdata_p0); } } //从SD读取信息 void Data_ReadFSD(void) { FILE *fp; char buffer[120]; fp = fopen("/Sensor_Data.cav", "r"); if (fp != RT_NULL) { fread(buffer, sizeof(char), sizeof(buffer), fp); rt_kprintf("%s", buffer); fclose(fp); } } void Save_Data_TOSD(float data1, float data2) { if(data1 >= HIGHT_TEMPVALUE) { detect_logic.T_Count_Alarm++; } else { detect_logic.T_Count_Alarm--; if(detect_logic.T_Count_Alarm <= 0) detect_logic.T_Count_Alarm = 0; } if(detect_logic.T_Count_Alarm >= MAX_COUNTER) { detect_logic.T_Count_Alarm = MAX_COUNTER; rt_kprintf("温度超过标准！%d\n",detect_logic.T_Count_Alarm); sprintf((char*)detect_logic.Alarm_buff, "Temp:%.2f,humi:%.2f", data1, data2); //拼接到温度数组里 //保存异常数据到SD卡 Sensor_DataTo_SD((char*)detect_logic.Alarm_buff); } // if(data2 >= HIGHT_HUMIVALUE) { detect_logic.H_Count_Alarm++; } else { detect_logic.H_Count_Alarm--; if(detect_logic.H_Count_Alarm <= 0) detect_logic.H_Count_Alarm = 0; } if(detect_logic.H_Count_Alarm >= MAX_COUNTER) { detect_logic.H_Count_Alarm = MAX_COUNTER; rt_kprintf("湿度超过标准！%d\n",detect_logic.H_Count_Alarm); sprintf((char*)detect_logic.Alarm_buff, "Temp:%.2f,humi:%.2f", data1, data2); //拼接到温度数组里 //保存异常数据到SD卡 Sensor_DataTo_SD((char*)detect_logic.Alarm_buff); } }

4.温度监控线程

温度异常时，会存储到SD卡中

static void Publish_th(void *pram) { //传感器数据结构体 Sensor_msg sensor_msg; static rt_uint32_t e; static char r_buff[64]; while(1) { if (rt_event_recv(Sensor_event, EVENT_ADC_FLAG, RT_EVENT_FLAG_AND | RT_EVENT_FLAG_CLEAR, RT_WAITING_FOREVER, &e) != RT_EOK) continue; //2000ms超时接收 --- if (rt_event_recv(Sensor_event, EVENT_TH_FLAG, RT_EVENT_FLAG_AND | RT_EVENT_FLAG_CLEAR, rt_tick_from_millisecond(2000), &e) == RT_EOK) { //永久等待接收邮件 if(rt_mb_recv(Sensor_msg_mb, (rt_ubase_t*)&sensor_msg, RT_WAITING_FOREVER) == RT_EOK) { sprintf((char*)r_buff, "Temp:%.2f,humi:%.2f", (float)sensor_msg->temp, (float)sensor_msg->hum); //拼接到温度数组里 } rt_kputs((char*)r_buff); rt_kputs("\n"); //阈值判断逻辑 Save_Data_TOSD((float)sensor_msg->temp, (float)sensor_msg->hum); //释放内存块 rt_mp_free(sensor_msg); sensor_msg = RT_NULL; continue; } //1s超时直接存数据 //阈值判断逻辑 rt_kputs("@1s接收事件超时--存储数据\n"); Sensor_DataTo_SD((char*)r_buff); } }