Sifang VC great god hello:
I write a serial port to read data, now already can reading, but because of the frequency of the sensor sends data is extremely high, when the toggle button event data save, save the data there will be many are the same, first consult everybody the teacher how to use the timer or other methods can set the time for data reading and save??
Pupil I thank everybody here

CodePudding user response:

Come in and see if it was a short time the data is almost repeat?

CodePudding user response:

Most is the fact that the saved data is the same, is not the same as displayed data

CodePudding user response:

When receiving data, you can make a judgment, as he took a save

CodePudding user response:

Fyi:

//loop to a function every time send 200 bytes (this is the fixed) buffer, 
//a function need to incoming buffer, the circulation of 240 bytes (fixed) new buffer for processing, 
//when dealing with each new printing takes two bytes of the buffer 
# ifdef _MSC_VER 
# pragma warning (4996) disable: 
# endif 
# include & lt; Stdio. H> 
# include & lt; Stdlib. H> 
# include & lt; String. H> 
# ifdef _MSC_VER 
# include & lt; Windows. H> 
# include & lt; Process. H> 
# include & lt; IO. H> 
# define MYVOID void 
# define vsnprintf _vsnprintf 
# the else 
# include & lt; Unistd. H> 
# include & lt; Sys/time. H> 
# include & lt; Pthread. H> 
# define CRITICAL_SECTION pthread_mutex_t 
# define MYVOID void * 
# endif 
//the Log {
# define MAXLOGSIZE 20000000 
# define MAXLINSIZE 16000 
# include & lt; Time. H> 
# include & lt; Sys/timeb. H> 
# include & lt; Stdarg. H> 
Char logfilename1 []="MyLog1. Log"; 
Char logfilename2 []="MyLog2. Log"; 
The static char logstr [MAXLINSIZE + 1]; 
Char datestr [16]. 
Char timestr [16]. 
Char MSS [4]. 
CRITICAL_SECTION cs_log; 
The FILE * flog; 
# ifdef _MSC_VER 
The Lock (CRITICAL_SECTION void * l) {
The EnterCriticalSection (l); 
} 
Void Unlock (CRITICAL_SECTION * l) {
LeaveCriticalSection (l); 
} 
Void sleep_ms (int) ms {
Sleep (ms). 
} 
# the else 
The Lock (CRITICAL_SECTION void * l) {
Pthread_mutex_lock (l); 
} 
Void Unlock (CRITICAL_SECTION * l) {
Pthread_mutex_unlock (l); 
} 
Void sleep_ms (int) ms {
Usleep (ms * 1000); 
} 
# endif 
Void LogV (const char * pszFmt, va_list argp) {
* struct tm now; 
Struct timeb TB; 

If (NULL==pszFmt | | 0==pszFmt [0]) return; 
Vsnprintf (logstr, MAXLINSIZE pszFmt, argp); 
Ftime (& amp; TB); 
Now=localtime (& amp; TB. Time); 
Sprintf (datestr, "% d % % 4 d - 02-02 d", now - & gt; Tm_year + 1900, now - & gt; Tm_mon + 1, now - & gt; Tm_mday); 
Sprintf (timestr, "02 02 02 % d: % d: % d", now - & gt; Tm_hour, now - & gt; Tm_min, now - & gt; Tm_sec); 
Sprintf (MSS, "% 3 d", TB. Millitm); 
Printf (" % s % s. % s % s ", datestr, timestr, MSS, logstr); 
Flog=fopen (logfilename1, "a"); 
If (NULL! Flog)={
Fprintf (flog, "% s % s. % s % s", datestr, timestr, MSS, logstr); 
If (ftell (flog) & gt; MAXLOGSIZE) {
The fclose (flog); 
If (rename (logfilename1 logfilename2)) {
Remove (logfilename2); 
Rename (logfilename1 logfilename2); 
} 
} else {
The fclose (flog); 
} 
} 
} 
Void the Log (const char * pszFmt,... ) {
Va_list argp; 

The Lock (& amp; Cs_log); 
Va_start (argp, pszFmt); 
LogV (pszFmt argp); 
Va_end (argp); 
Unlock (& amp; Cs_log); 
} 
//the Log} 
# define ASIZE 200 
# define BSIZE 240 
# define CSIZE 2 
Char Abuf [ASIZE]; 
Char Cbuf [CSIZE]; 
CRITICAL_SECTION cs_HEX; 
CRITICAL_SECTION cs_BBB; 
Struct FIFO_BUFFER {
Int the head; 
Int tail; 
Int size; 
Char data [BSIZE]; 
} BBB; 
Int No_Loop=0; 
Void HexDump) (int cn, char * buf, int len) {
int i,j,k; 
Char binstr [80]. 

The Lock (& amp; Cs_HEX); 
for (i=0; IIf (0==16) (I %) {
Sprintf (binstr, "% 3 d % 4 x -", cn, I); 
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
} else if (15==16) (I %) {
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
Sprintf (binstr, "% s", binstr); 
For (j=I - 15; J<=I; J++) {
Sprintf (binstr, "% s % c," binstr, ('! '& lt; Buf [j] & amp; & Buf [j] <='~')? Buf [j] : '. '); 
} 
The Log (" % s \ n ", binstr); 
} else {
Sprintf (binstr, "% s % 02 x", binstr, buf (unsigned char) [I]); 
} 
} 
If (0! 16)=(I %) {
16 k=16 - (I %); 
For (j=0; JSprintf (binstr, "% s", binstr); 
} 
Sprintf (binstr, "% s", binstr); 
K=16 - k; 
For (j=I - k; JSprintf (binstr, "% s % c," binstr, ('! '& lt; Buf [j] & amp; & Buf [j] <='~')? Buf [j] : '. '); 
} 
The Log (" % s \ n ", binstr); 
} 
Unlock (& amp; Cs_HEX); 
} 
Int GetFromRBuf (int cn, CRITICAL_SECTION * cs, struct FIFO_BUFFER * fbuf, char * buf, int len) {
Int lent, len1 len2; 

Lent=0; 
The Lock (cs); 
If (fbuf - & gt; Size> Len)={
Lent=len; 
If (fbuf - & gt; The head + lent> BSIZE) {
Len1=BSIZE fbuf - & gt; head; 
Memcpy (buf, fbuf - & gt; The data + fbuf - & gt; The head, len1); 
Len2=lent - len1; 
Memcpy (buf + len1 fbuf - & gt; The data, len2); 
Fbuf - & gt; The head=len2; 
} else {
Memcpy (buf, fbuf - & gt; The data + fbuf - & gt; The head, lent); 
Fbuf - & gt; The head +=lent; nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull