Hi all, I have a number of driver related function calls that I would like to add as Primitive functions to yhc and yhi. For yhi (yhc\src\runtime\BCKernel) I have added definitions to Runtime.c and WrapPrimitive.c, in order to define and wrap stuff like "void display_string(void)" where the function is declared in a display.h/display.c file (this code controls the LCD display of the NXT). So far I think I have this yhi part covered. My question is about where these primitives are made known to the compiler so I can make display_string visible to yhc programs. After adding this line to Primitive.hs yhc hangs... ---------------------------------------------------------------------------------------------------- -- NXT Display ---------------------------------------------------------------------------------------------------- foreign import fastccall display_string :: CString -> IO () I just noticed the following files seem to have something todo with things: C:\YHC_OLD_SOURCES\yhc_again\yhc\src\packages\yhc-base-1.0\YHCPrimitive.hs C:\YHC_OLD_SOURCES\yhc_again\yhc\src\compiler\Prim.hs C:\YHC_OLD_SOURCES\yhc_again\yhc\src\compiler\PrimCode.hs C:\YHC_OLD_SOURCES\yhc_again\yhc\src\compiler98\Prim.hs C:\YHC_OLD_SOURCES\yhc_again\yhc\src\compiler98\PrimCode.hs Which changes I need to make before recompiling YHC? Thanks in advance. :) Cheers, -- </Alexis>