ViP Example using the Cyclone III Development board

Tracked down the problem to the "io.h" include file. It has the following lines.

# ifndef SYSTEM_BUS_WIDTH

# error SYSTEM_BUS_WIDTH undefined (this line is marked "error with text")

# endif

It later makes the following definitions.

# define __IO_CALC_ADDRESS_NATIVE(BASE, REGNUM)

((void *)(((alt_u8*)BASE) + ((REGNUM) * (SYSTEM_BUS_WIDTH/8))))

# define IORD(BASE, REGNUM)

__builtin_ldwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)))

# define IOWR(BASE, REGNUM, DATA)

__builtin_stwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)), (DATA))

The error I received after reloading in Eclipse is "Function '_builtin_stwio' could not be resolved.

I have no idea where SYSTEM_BUS_WIDTH is defined.