Commonmark migration

Source Link

edited Jun 17, 2020 at 8:21

1

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR | O_APPEND);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR | O_APPEND);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR | O_APPEND);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

added 11 characters in body

Source Link

edited Aug 29, 2017 at 14:53

ATE-ENGE

941
3
19
32

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR | O_APPEND);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR | O_APPEND);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

Source Link

asked Aug 29, 2017 at 14:34

ATE-ENGE

941
3
19
32

Arduino SDFat Libray overwrites last value

I'm trying to create a comma delimited file using this SDFat library

Calling this code creates my file

const char Header[24]="Desired RPM,Output RPM\n";
...
foo()
{
  SpeedCache.open("/Speed_Cache.txt",O_CREAT | O_RDWR);
  SpeedCache.write(Header);
  SpeedCache.sync();
}
...

After running, I have a file containing

Desired RPM,Output RPM'\n'

When I call the following function, I want it to add int target and int reference to the bottom of the file.

bool SDClass::SetLine(SdFile Cache,int target, int reference)
{   
  bool good = false;
  char NewLine[32];
  Cache.seekEnd();
  sprintf_P(NewLine,(PGM_P)F("%d,%d\n"),target,reference);
  Serial.println(good=Cache.write(NewLine));
  Cache.sync();
  return good;
}

On the first call, this works so for an input of SpeedCache,50,100 I get

Desired RPM,Output RPM'\n'

50,100'\n'

However, if I then write an input of SpeedCache,5,10 I get

Desired RPM,Output RPM'\n'

5,10'\n'

How do I adjust my function so that I will get:

Desired RPM,Output RPM'\n'

50,100'\n'

5,10'\n'

arduino-mega fat

Stack Exchange Network

Return to Question

Arduino SDFat Libray overwrites last value