Dear All,
I have a doubt.
What's the difference between
_cell.flush()
and
while(_cell.available() > 0) _cell.read();
The second clean _cell,
but ehat does the first? It cleans as well?
The first flushes the output buffer, the second flushes the input buffer.
Ok, thank for your answer.
I am sorry, 
but what the difference between the input and the output.
I tell you why my stupid question.
I am using openlog. When run the append command, I always have 3 specials caracters.
Exemple of the 3 special caracters and text pasted in a word document
I eart that thoses 3 special caracter are heximal caracter.
With Openlog, to return to the command mode, you have to do
_openlog.print(26); // 26 is an exa
_openlog.print(26);
_openlog.print(26);
Then , I think my 3 special caracters have a relation with .openlog.print(26).
It's the reason why, I though about cleaning _openlog. But following your answer, I do not know if I have to clean the input or the output.
So, if I have to use
_openlog.flush()
or
while(_openlog.available() > 0) _openlog.read();
I already tried
_openlog.print(26); // 26 is an exa
_openlog.print(26);
_openlog.print(26);
_openlog.flush()
but it did not help.
FYI: Here is my append function
uint8_t WI968C::sd_append(char * fileName, char * string, bool isNewFile)
{
uint8_t answer = 0;
//delay(5000);
#ifdef SD_ACTIVE
if(isSDok)
{
#ifdef DEBUG
sprint(F("\nSD APPEND "));
sprint(fileName);
sprint(F(" "));
sprintln(string);
#endif
_openlog.listen();
delay(100);
if (_openlog.isListening())
{
if(sd_gotoCommandMode())
{
// APPEND TO THE FILE GPSLOG
_openlog.print(F("append "));
_openlog.print(fileName);
//_openlog.print('\r');
_openlog.write(13);
unsigned int timeout = 3000; //10000
unsigned long previous;
previous = millis();
do{
if(_openlog.available())
{
if(_openlog.read() == '<')
{
answer = 1;
isCommandMode = false;
}
}
}while((answer <= 0) && ((millis() - previous) < timeout));
if(answer == 1)
{
//isCommandMode = false;
if(strlen(string) > 0)
{
// Write the fix to the file
_openlog.print("{");
_openlog.print(string);
_openlog.print("}");
_openlog.write(13);
}
else
{
//_openlog.write(13);
_openlog.print('\r');
}
//Return to command mode
sd_gotoCommandMode();
// _openlog.write(26);
// _openlog.write(26);
// _openlog.write(26);
#ifdef DEBUG_SD
sprint(F("SD Append\t\t"));
sprintln(OK_RESPONSE);
#endif
} //end if answer
else
{
#ifdef DEBUG_SD
sprint(F("SD Append\t\t"));
sprintln(KO_RESPONSE);
#endif
isCommandMode = true;
} // end if answer
} // sd_gotoCommandMode
else
{
answer = -51;
}
// Listen _cell
do
{
_cell.listen();
#ifdef DEBUG_SD
sprintln(SD_LISTING_CELL);
#endif
delay(100);
}while(!_cell.isListening());
} // end listing
else
{
#ifdef DEBUG
sprintln(SD_ERR_LISTING_OPENLOG);
#endif
//isCommandMode = false;
answer = -52;
} // end listening
//return answer;
}
else
{
#ifdef DEBUG
sprintln(SD_KO);
#endif
answer = -53;
}
#else
#ifdef DEBUG
sprintln(SD_UNACTIVE);
#endif
answer = -54;
#endif
return answer;
}
Stuff being sent TO the Arduino goes in the input buffer. Stuff being sent FROM the Arduino goes in the output buffer. The flush() method blocks, waiting for the outgoing buffer to be empty. Typically it is only used if the Arduino needs to send data before going to sleep.
Why would you print() 26 to the OpenLog device? It might make sense to write() 26 to the device.
Hello Pauls,
Excuse me, it's a error.
My code is not with print(26) but write(26)
pierrot10:
Ok, thank for your answer.
I am sorry,I tell you why my stupid question.
I am using openlog. When run the append command, I always have 3 specials caracters.
Exemple of the 3 special caracters and text pasted in a word document
I eart that thoses 3 special caracter are heximal caracter.With Openlog, to return to the command mode, you have to do
_openlog.write(26); // 26 is an exa
_openlog.write(26);
_openlog.write(26);
Then , I think my 3 special caracters have a relation with .openlog.write(26). It's the reason why, I though about cleaning _openlog. But following your answer, I do not know if I have to clean the input or the output. So, if I have to use_openlog.flush()
orwhile(_openlog.available() > 0) _openlog.read();
I already tried_openlog.write(26); // 26 is an exa
_openlog.write(26);
_openlog.write(26);
_openlog.flush()but it did not help. FYI: Here is my append functionuint8_t WI968C::sd_append(char * fileName, char * string, bool isNewFile)
{
uint8_t answer = 0;
//delay(5000);
#ifdef SD_ACTIVE
if(isSDok)
{
#ifdef DEBUG
sprint(F("\nSD APPEND "));
sprint(fileName);
sprint(F(" "));
sprintln(string);
#endif
_openlog.listen();
delay(100);
if (_openlog.isListening())
{
if(sd_gotoCommandMode())
{
// APPEND TO THE FILE GPSLOG
_openlog.print(F("append "));
_openlog.print(fileName);
//_openlog.print('\r');
_openlog.write(13);
unsigned int timeout = 3000; //10000
unsigned long previous;
previous = millis();
do{
if(_openlog.available())
{
if(_openlog.read() == '<')
{
answer = 1;
isCommandMode = false;
}
}
}while((answer <= 0) && ((millis() - previous) < timeout));
if(answer == 1)
{
//isCommandMode = false;
if(strlen(string) > 0)
{
// Write the fix to the file
_openlog.print("{");
_openlog.print(string);
_openlog.print("}");
_openlog.write(13);
}
else
{
//_openlog.write(13);
_openlog.print('\r');
}
//Return to command mode
sd_gotoCommandMode();
// _openlog.write(26);
// _openlog.write(26);
// _openlog.write(26);
#ifdef DEBUG_SD
sprint(F("SD Append\t\t"));
sprintln(OK_RESPONSE);
#endif
} //end if answer
else
{
#ifdef DEBUG_SD
sprint(F("SD Append\t\t"));
sprintln(KO_RESPONSE);
#endif
isCommandMode = true;
} // end if answer
} // sd_gotoCommandMode
else
{
answer = -51;
}
// Listen _cell
do
{
_cell.listen();
#ifdef DEBUG_SD
sprintln(SD_LISTING_CELL);
#endif
delay(100);
}while(!_cell.isListening());
} // end listing
else
{
#ifdef DEBUG
sprintln(SD_ERR_LISTING_OPENLOG);
#endif
//isCommandMode = false;
answer = -52;
} // end listening
//return answer;
}
else
{
#ifdef DEBUG
sprintln(SD_KO);
#endif
answer = -53;
}
#else
#ifdef DEBUG
sprintln(SD_UNACTIVE);
#endif
answer = -54;
#endif
return answer;
}