folkert/simh-testsetgenerator
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 1

PDP11, all VAX: better manage VH input FIFO empty transition status (Ed Marr)

Browse source
This commit is contained in:
Mark Pizzolato 2018-08-16 15:30:39 -07:00
parent 664a2d555c
commit c833c933ed
1 changed files with 6 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
PDP11/pdp11_vh.c
View file

@ -779,10 +779,9 @@ static int32 fifo_get ( int32 vh )
{
int32 data, i;
if (rbuf_idx[vh] == 0) {
vh_csr[vh] &= ~CSR_RX_DATA_AVAIL;
if (rbuf_idx[vh] == 0)
return (0);
}
/* pick off the first character, mark valid */
data = vh_rbuf[vh][0] | RBUF_DATA_VALID;
/* move the remainder up */
@ -815,6 +814,10 @@ static int32 fifo_get ( int32 vh )
}
}
}
if (rbuf_idx[vh] == 0) /* FIFO just became empty? */
vh_csr[vh] &= ~CSR_RX_DATA_AVAIL; /* clear CSR bit ti indicate this */
/* Reschedule the next poll preceisely so that the
programmed input speed is observed. */
sim_clock_coschedule_abs (vh_poll_unit, tmxr_poll);