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效果：
按天建文件夹，按小时建文件
从串口读取库伦计的打印内容，过滤掉干扰字符后用scanf将关注的数字分离出来之后写入txt文件
matlab从txt文件中读入数据绘图分析
完整源码
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>#define PATH_TTYDEVICE "/dev/ttyUSB0"
#define MAX_BUF_SIZE 100FILE *fp = NULL;
FILE *fp1 = NULL;void Stop(int signo)
{fclose(fp1);printf("oop! stop!!!\n");_exit(0);
}int CreateDir(const char *sPathName) { char DirName[256]; strcpy(DirName, sPathName); int i,len = strlen(DirName);for(i=1; i<len; i++) { if(DirName[i]=='/') { DirName[i] = 0; if(access(DirName, 0)!=0) { if(mkdir(DirName, 0755)==-1) { printf("mkdir error\n"); return -1; } } DirName[i] = '/'; } } return 0; } int CreateFile(const char *path)
{FILE *f;if(access(path, 0)!=0) {f = fopen(path, "w+");if( f == NULL) {printf("create file failed \r\n");return -1;}else {fclose(f);return 0;}}return -1;
}void getdate(char *date, char *hour)
{struct tm *my_tm;time_t t1;t1 = time(&t1);my_tm = localtime(&t1);sprintf(date, "%04d-%02d-%02d" ,my_tm->tm_year + 1900, my_tm->tm_mon + 1, my_tm->tm_mday);sprintf(hour, "%02d" ,my_tm->tm_hour);//printf("current my_tm : %04d-%02d-%02d %02d:%02d:%02d\n\r", my_tm->tm_year + 1900, my_tm->tm_mon + 1, my_tm->tm_mday,my_tm->tm_hour, my_tm->tm_min, my_tm->tm_sec );}void analyse(char *Buf)
{float v,c,w,t;char time[15];char *buf = Buf;/*skip letter just analyse number */while(1) {if (*buf >= '0' && *buf <= '9') {break;}buf++;}sscanf(buf,"%fV,%fA,%fAh,%s\r\n",&v,&c,&w,time);if (v>25.0) {v= 25.0;}if (c > 5.0) {c = 5.0;}if (w > 80.0) {w = 80.0;}fprintf(fp1, "%f %f %f\r\n",v,c,w);
}int main(int c, char *args[])
{char buf[MAX_BUF_SIZE];char path[20];int size,ret;int index=0;char date[30];char hour[3];signal(SIGINT, Stop);fp = fopen(PATH_TTYDEVICE, "r+");if (fp == NULL) {printf("failed: can not open tty device \r\n! ");return -1;}while(1) {memset(date,0,sizeof(date));memset(hour,0,sizeof(hour));getdate(date,hour);memset(path,0,sizeof(path));sprintf(path,"%s/",date);CreateDir(path);memset(path,0,sizeof(path));sprintf(path,"./%s/%s.txt",date,hour);ret = CreateFile(path);if (ret == 0 ) {if (fp1 != NULL) {fclose(fp1);}fp1 = fopen(path, "w+");if (fp1 == NULL) {printf("failed: can not open txt file to save the result! \r\n ");return -1;}}fseek(fp, 0, SEEK_SET);size = fread(buf+index, 1,1,fp);if (buf[index] != 0) {if(buf[index] == '\n') {if (index > 10) {printf("read from tty : \r\n");printf("%s\r\n", buf);analyse(buf);}index = -1;memset(buf, 0, MAX_BUF_SIZE);}index++;}}fclose(fp);fclose(fp1);_exit(0);
}matlab M文件
%读取库仑计打印到txt中的数据进行绘图分析path = 'E:\VMWareShare\14.txt';
data=load(path);
V=data(:,1);
C=data(:,2);
W=data(:,3);
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