idDigit() and isAlpha() undefined

[phieber]

the two functions are undefined

/home/phieber/Downloads/arduino-1.6.5/libraries/Adafruit-GPS-Library/Adafruit_GPS.cpp: In member function 'boolean Adafruit_GPS::LOCUS_ReadStatus()':
/home/phieber/Downloads/arduino-1.6.5/libraries/Adafruit-GPS-Library/Adafruit_GPS.cpp:454:20: error: 'isDigit' was not declared in this scope
if (isDigit(c))
^
/home/phieber/Downloads/arduino-1.6.5/libraries/Adafruit-GPS-Library/Adafruit_GPS.cpp:463:24: error: 'isAlpha' was not declared in this scope
if (isAlpha(parsed[2])) {
^
Error compiling

[tdicola]

What platform/board are you using? It looks like it might be an issue with that board not implementing the same functions as the normal Arduino cores like the Uno, Due, etc.

[phieber]

I use the TeensyLC

[microbuilder]

Sorry for the slow reply ... I just ran into this myself on a different ARM board.

This is due to a difference in the standard C++ library function names. Most ARM toolchains include a libc with lower case isdigit, isalpha (etc.) functions in ctype.h, but the Arduino libraries that most drivers are written against use isDigit, isAlpha, etc., with an upper case character.

It's a hack, but as a quick fix you can open up the main .c file and insert an #ifdef like this to toggle between the two, you just need to find an appropriate test value in the define for your platform (Teensy, etc.):

  #if defined(ARDUINO_ARCH_STM32F2)
  if (isdigit(c))
  #else
  if (isDigit(c))
  #endif

And the same for isAlpha:

  #if defined(ARDUINO_ARCH_STM32F2)
  if (isalpha(parsed[2])) {
  #else
  if (isAlpha(parsed[2])) {
  #endif