libNDS is a library useful for those out there, who like to write their own programs.

Changes:

Refactored and improved eeprom detection code.
changed timerStop() to clear the entire register and an internal variable.
added timerTick(), timerPause(), timerStop(), timerUnpause() and cpuGetTiming() functions.
fixed overflow bug in timerElapsed.
restored stderr output on default console.
added oamClearSprite() to clear a single sprite.
corrected keyboard = symbol.
startup code allocates VRAM A, B, C & D to reasonable default – main bg, main obj, sub bg & sub obj.
improved and extended doxygen documentation.

http://devkitpro.org/viewtopic.php?f=13&t=2060