Hi guys,
just throwing in a snippet, I think this question has come up before.
For example, a duplex FIFO wrapper on the VHDL side:
subtype fifoflag_t is unsigned(0 to 5);
...
procedure fifo_rxtx(df : inout duplexfifo_t; data : inout unsigned;
flags : inout fifoflag_t)
would map into
void sim_fifo_rxtx(duplexfifo_t_ghdl *fifo,
struct fat_pointer *data, char *flag)
{
DuplexFifo *f = (DuplexFifo *) fifo[0];
fifo_pump(f, data, flag);
}
So the sized unsigned type in VHDL becomes [char *], the unsized a
[struct fat_pointer *]. I believe it is documented how to pull out the
bits, otherwise, have a look at the ghdlex functions in helper.c
(logic_to_bytes, etc.). The reverse conversion is also covered there.
Greetings,
- Martin
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