altera_avalon_fifo_write_ienable IE_ALMOSTFULL

No, you don't understand.

I obviously read the documentation and that's where I got the names IE_FULL, etc.

Then I wrote some C code:

status = altera_avalon_fifo_write_ienable(IPMB_0_FIFO_IN_CSR_BASE, IE_FULL | IE_ALMOSTFULL);

And tried to compile it, and it errors saying IE_FULL (and friends) are not defined.

grepping the hal_bsp directory reveals those names are not defined anywhere.

But that was 5 days ago.

The correct answer is:

#include "altera_avalon_fifo_regs.h"

Use:

ALTERA_AVALON_FIFO_IENABLE_F_MSK

ALTERA_AVALON_FIFO_IENABLE_AF_MSK

etc.

But the real real correct answer is:

You cant call altera_avalon_fifo_write_ienable() function after altera_avalon_fifo_init(). Instead, pass the ienable flags you want as the second parameter of altera_avalon_fifo_init().

-Andy