实例介绍
【实例简介】监控汽车电池的嵌入式应用程序,非常好用的程序,电池管理系统不仅要监测混合动力汽车电池的充放电电流、总电压和剩余电量SOC,还要预测电池的功率强度,以便监控电池的使用状况,并且不对电池造成伤害
【实例截图】
【核心代码】
/* * data_access.c * 数据管理模块 */ #include <stdio.h> #include <string.h> #include <semaphore.h> #include <sys/stat.h> #include <unistd.h> #include <sys/types.h> #include <fcntl.h> #include <include/config.h> #include <include/user_typedef.h> #include "data_access.h" /******************************************************************************************** * * 数据向文件保存部分 * ********************************************************************************************/ #define LEN 1584 112 int fpd; static const uint8 day_per_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; static struct stat state; void write_int(int i) { char tmp; i = i%100; tmp = i/10 '0'; write(fpd,&tmp,1); tmp = i%10 '0'; write(fpd,&tmp,1); } int write_time(datetime_type t) { int daya,dayb; char tmp; int i; // t.year=9; // t.sec=3600*24*123 3600*11 60*26 1; write_int(t.sec/3600%24); tmp = '.'; write(fpd,&tmp,1); write_int(t.sec%3600/60); tmp = '.'; write(fpd,&tmp,1); write_int(t.sec%60); tmp = ':'; write(fpd,&tmp,1); write_int(t.year); tmp = '.'; write(fpd,&tmp,1); daya = t.sec/3600/24; dayb =0; for(i=0; dayb<=daya&&i<12; i ) { if( (i==1) && ((t.year 2000)%400==0) || (((t.year 2000)%4==0)&&((t.year 2000)%100!=0)) ) { dayb = 29; } else { dayb = day_per_month[i]; } } write_int(i); tmp = '.'; write(fpd,&tmp,1); write_int(day_per_month[i-1] -dayb daya 1); //这里不是很清楚 tmp = 0x2c; write(fpd,&tmp,1); return 0; } int write_float(float d) { int data; unsigned char v; data = (int)(d*100 0.5); data = data%1000; v = data/100 '0'; data = data%100; write(fpd,&v,1); v = 0x2e; write(fpd,&v,1); v = data/10 '0'; data = data%10; write(fpd,&v,1); v = data '0'; write(fpd,&v,1); v = 0x2c; write(fpd,&v,1); return 0; } int file_save_init() { int len,i,j; char tmp,a,b; fpd = open("last.csv",O_RDWR|O_CREAT|O_APPEND); if(fpd == -1) { printf("error\n"); return 0; } stat("last.csv",&state); len = state.st_size; if(len <LEN) { lseek(fpd,0,SEEK_SET); for(i=1;i<=BOX_MAX;i ) { write(fpd,"时间",4); tmp= 0x2c; write(fpd,&tmp,1); for(j=1;j<=PART_MAX;j ) { if(i/10==1) write(fpd,"1",1); tmp = i%10 '0'; write(fpd,&tmp,1); write(fpd,"箱",2); if(j/10==1) write(fpd,"1",1); tmp = j%10 '0'; write(fpd,&tmp,1); write(fpd,"节",2); tmp = 0x2c; write(fpd,&tmp,1); } } } lseek(fpd,-2,SEEK_END); if(1 != read(fpd,&a,1) || 1 != read(fpd,&b,1) ) return -1; if(a != 0xd || b != 0xa ) { tmp = 0xd; write(fpd,&tmp,1); tmp = 0xa; write(fpd,&tmp,1); } return 0; } int write_record(record_type record) { int len,i,j; char tmp; // fseek(fpa,SEEK_SET,SEEK_END); stat("last.csv",&state); len = state.st_size;; if(len > 5000000) { close(fpd); unlink("before.csv"); link("last.csv","before.csv"); unlink("last.csv"); file_save_init(); } for(i=0;i<BOX_MAX;i ) { write_time(record.time); for(j=0;j<PART_MAX;j ) { write_float(record.voltage[i][j]); } } tmp = 0xd; write(fpd,&tmp,1); tmp = 0xa; write(fpd,&tmp,1); // fflush(fpa); return 0; } /****************************************************************************************************************** * * * *******************************************************************************************************************/ static overview_type battery_overview; static batterybox_state_type batterybox_state[BOX_MAX]; //电源箱状态,包括风扇状态、报警等 static battery_state_type battery_state[BOX_MAX]; //下行内容,开始充电,充电完成等 static batterybox_configure_type batterybox_configure[BOX_MAX]; //上行内容 static struct { int head; int tail; record_type buf[DATA_BUF_LEN]; } battery_data_buf; static sem_t sem_data; //保证数据的互斥访问 /* 初始化 缓冲区为零,初始化信号量 */ void data_access_init(void) { file_save_init();//数据储存文件初始化 memset(&battery_data_buf, 0, sizeof(battery_data_buf)); memset(&battery_overview, 0, sizeof(overview_type)); memset(&battery_state, 0, sizeof(battery_state)); memset(&batterybox_configure, 0, sizeof(batterybox_configure)); battery_data_buf.head = battery_data_buf.tail = 0; sem_init(&sem_data,0,1); } /* */ void data_access_add(record_type data) { int posMax,posMin; float sum ; int count; record_type * p; if(data.alarm !=0) write_record(data);//把记录保存到文件中,暂时在这里实现 sem_wait(&sem_data); battery_data_buf.buf[battery_data_buf.tail] = data; battery_data_buf.tail = (battery_data_buf.tail 1)%DATA_BUF_LEN; //队列满则删除队列头一个记录 if(battery_data_buf.head == battery_data_buf.tail) { battery_data_buf.head = (battery_data_buf.head 1)%DATA_BUF_LEN; } posMax = 0; posMin = 0; sum = data.voltage[0][0]; for(count=1;count<BOX_MAX*PART_MAX;count ) { sum = data.voltage[0][count]; if(data.voltage[0][count] > data.voltage[0][posMax]) posMax = count; if(data.voltage[0][count] < data.voltage[0][posMin]) posMin = count; } battery_overview.voltage_max.box_num = posMax/PART_MAX 1; battery_overview.voltage_max.part_num = posMax%PART_MAX 1; battery_overview.voltage_max.value = data.voltage[0][posMax]; battery_overview.voltage_min.box_num = posMin/PART_MAX 1; battery_overview.voltage_min.part_num = posMin%PART_MAX 1; battery_overview.voltage_min.value = data.voltage[0][posMin]; battery_overview.voltage_total = sum; posMax = 0; posMin = 0; for(count=1;count<BOX_MAX*3;count ) { if(data.temperature[0][count] > data.temperature[0][posMax]) posMax = count; if(data.temperature[0][count] < data.temperature[0][posMin]) posMin = count; } battery_overview.temperature_max.box_num = posMax%3 1; battery_overview.temperature_max.value = data.temperature[0][posMax]; battery_overview.temperature_min.box_num = posMin%3 1; battery_overview.temperature_min.value = data.temperature[0][posMin]; battery_overview.current_total = data.current; battery_overview.alarm_num = data.alarm; //if( //还有soc 和 alarm_num 没有更新 sem_post(&sem_data); } /* */ int data_access_queuelen(void) { int len; sem_wait(&sem_data); len = (battery_data_buf.tail DATA_BUF_LEN-battery_data_buf.head)%DATA_BUF_LEN; sem_post(&sem_data); return len; } /* */ float data_access_get_voltage(int box_num, int part_num) { if(box_num < BOX_MAX && part_num < PART_MAX) { int index; float voltage; sem_wait(&sem_data); if(battery_data_buf.head == battery_data_buf.tail) { voltage = 0; } else { index = (battery_data_buf.tail DATA_BUF_LEN-1)%DATA_BUF_LEN; voltage = battery_data_buf.buf[index].voltage[box_num][part_num]; } sem_post(&sem_data); return voltage; } else { return 0; } } /* */ float data_access_get_temperature(int box_num, int n) { if((box_num < BOX_MAX) && n<3) { int index; float temp; sem_wait(&sem_data); if(battery_data_buf.head == battery_data_buf.tail) { temp = 0; } else { index = (battery_data_buf.tail DATA_BUF_LEN-1)%DATA_BUF_LEN; temp = battery_data_buf.buf[index].temperature[box_num][n]; } sem_post(&sem_data); return temp; } else { return 0; } } /* */ char data_access_get_fanstatus(int box_num) { if(box_num < BOX_MAX) { int index; char fan; sem_wait(&sem_data); /*if(battery_data_buf.head == battery_data_buf.tail) { fan = 0; } else { index = (battery_data_buf.tail DATA_BUF_LEN-1)%DATA_BUF_LEN; fan = battery_data_buf.buf[index].state[box_num].fan; }*/ fan = batterybox_state[box_num].fan; sem_post(&sem_data); return fan; } else { return 0; } } /* */ float data_access_get_current(void) { int index; float current; sem_wait(&sem_data); if(battery_data_buf.head == battery_data_buf.tail) { current = 0; } else { index = (battery_data_buf.tail DATA_BUF_LEN-1)%DATA_BUF_LEN; current = battery_data_buf.buf[index].current; } sem_post(&sem_data); return current; } /* */ record_type data_access_get_recorditem(void) { int index; record_type record; sem_wait(&sem_data); if(battery_data_buf.head == battery_data_buf.tail) { memset(&record, 0, sizeof(record)); } else { index = (battery_data_buf.tail DATA_BUF_LEN-1)%DATA_BUF_LEN; record = battery_data_buf.buf[index]; } sem_post(&sem_data); return record; } /* */ overview_type data_access_get_overview(void) { overview_type overview; sem_wait(&sem_data); overview = battery_overview; sem_post(&sem_data); return overview; } /* */ void data_access_savetofile(char *filename) { } /* * data_access_add_configure * 添加站点配置信息 * box_num:电源箱编号 * data:配置数据 */ void data_access_add_configure(int box_num, batterybox_configure_type data) { if(box_num < BOX_MAX) { sem_wait(&sem_data); batterybox_configure[box_num] = data; sem_post(&sem_data); } } /* */ batterybox_configure_type data_access_get_configure(int box_num) { batterybox_configure_type result; if(box_num < BOX_MAX) { sem_wait(&sem_data); result = batterybox_configure[box_num]; sem_post(&sem_data); } else { memset(&result, 0, sizeof(result)); } return result; } /* * data_access_add_batterystate * 添加电池状态数据 */ void data_access_add_batterystate(int box_num, battery_state_type data) { if(box_num < BOX_MAX) { sem_wait(&sem_data); battery_state[box_num] = data; sem_post(&sem_data); } } /* */ battery_state_type data_access_get_batterystate(int box_num) { battery_state_type result; if(box_num < BOX_MAX) { sem_wait(&sem_data); result = battery_state[box_num]; sem_post(&sem_data); } else { memset(&result, 0, sizeof(result)); } return result; } /* * data_access_add_boxstate * 添加电源箱状态数据 */ void data_access_add_boxstate(int box_num, batterybox_state_type data) { if(box_num < BOX_MAX) { sem_wait(&sem_data); batterybox_state[box_num] = data; sem_post(&sem_data); } } /* */ batterybox_state_type data_access_get_boxstate(int box_num) { batterybox_state_type result; if(box_num < BOX_MAX) { sem_wait(&sem_data); result = batterybox_state[box_num]; sem_post(&sem_data); } else { memset(&result, 0, sizeof(result)); } return result; }
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