'strupr' was not declared in this scope

[AngelRionCervi]

strupr doesn't seem to be supported on Arduino R4 WIFI, I get his error whenever trying to use the library.

[AngelRionCervi]

Closed and reopened with relevant informations

[jwilleke]

Me Too!

[jwilleke]

This seems to get around the issue.

Added at after includes of DFRobot_PH.cpp
`
/**

• The strupr only shift to uppercase
• This adds a 'hack' function to overcome the issue.
• However, this should probably be fixed in a more basic maner.
  */
  void strupr(char *str)
  {
  while (*str)
  {
  *str = toupper((unsigned char)*str);
  str++;
  }
  }
  `

I updated this at: https://github.com/jwilleke/Analog-pH-meter

[AngelRionCervi]

I no longer have the problem since I used another library, but thanks for the update on the issue ! I will check it out