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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: HP Deskjet 540 Setup Assistance Requested
Date: 5 May 1996 16:11:14 GMT
Organization: Private BSD site, Dresden
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Message-ID: <4mijv2$sb9@uriah.heep.sax.de>
References: <4mgefd$6j9@usenet.rpi.edu>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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mahj@cortez.its.rpi.edu (Jon Mah (JaMah!)) wrote:
> I am running FreeBSD 2.1 Release, and have an
> HP Deskjet 540 which I am attempting to connect and use.
> In my preliminary setups,
>
> cat > /dev/lpt0
> lptest 20 5 > /dev/lpt0
>
> each do not produce any output.
Not any output? Or would they produce output after a rather long
amount of time (ie. you notice on the printer that it's receiving data
slowly, but no paper comes out)?
Several newer {Desk,Laser}Jets are known to be broken since HP has
botched the /ACK timing. There's a fix available now (see below).
What makes me nervous is that all these printers worked fine in polled
mode.
Index: /sys/i386/isa/lpt.c
===================================================================
RCS file: /home/cvs/src/sys/i386/isa/lpt.c,v
retrieving revision 1.52
retrieving revision 1.53
diff -u -u -r1.52 -r1.53
--- lpt.c 1996/03/29 11:54:56 1.52
+++ lpt.c 1996/04/04 12:28:36 1.53
@@ -46,7 +46,7 @@
* SUCH DAMAGE.
*
* from: unknown origin, 386BSD 0.1
- * $Id: lpt.c,v 1.52 1996/03/29 11:54:56 bde Exp $
+ * $Id: lpt.c,v 1.53 1996/04/04 12:28:36 joerg Exp $
*/
/*
@@ -149,7 +149,8 @@
#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
-#define LPTOUTTIME 4 /* wait up to 4 seconds for a ready */
+#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
+#define LPTOUTMAX 1 /* maximal timeout 1 s */
#define LPPRI (PZERO+8)
#define BUFSIZE 1024
@@ -221,6 +222,7 @@
#define LP_HAS_IRQ 0x01 /* we have an irq available */
#define LP_USE_IRQ 0x02 /* we are using our irq */
#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
+ u_char sc_backoff ; /* time to call lptout() again */
#ifdef INET
struct ifnet sc_if;
@@ -590,7 +592,8 @@
lprintf("irq %x\n", sc->sc_irq);
if (sc->sc_irq & LP_USE_IRQ) {
sc->sc_state |= TOUT;
- timeout ((timeout_func_t)lptout, (caddr_t)sc, hz/2);
+ timeout ((timeout_func_t)lptout, (caddr_t)sc,
+ (sc->sc_backoff = hz/LPTOUTINITIAL));
}
lprintf("opened.\n");
@@ -602,9 +605,12 @@
{ int pl;
lprintf ("T %x ", inb(sc->sc_port+lpt_status));
- if (sc->sc_state & OPEN)
- timeout ((timeout_func_t)lptout, (caddr_t)sc, hz/2);
- else
+ if (sc->sc_state & OPEN) {
+ sc->sc_backoff++;
+ if (sc->sc_backoff > hz/LPTOUTMAX)
+ sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
+ timeout ((timeout_func_t)lptout, (caddr_t)sc, sc->sc_backoff);
+ } else
sc->sc_state &= ~TOUT;
if (sc->sc_state & ERROR)
@@ -785,6 +791,7 @@
{
struct lpt_softc *sc = lpt_sc + unit;
int port = sc->sc_port, sts;
+ int i;
#ifdef INET
if(sc->sc_if.if_flags & IFF_UP) {
@@ -793,9 +800,19 @@
}
#endif /* INET */
- /* is printer online and ready for output */
- if (((sts=inb(port+lpt_status)) & RDY_MASK) == LP_READY) {
+ /*
+ * Is printer online and ready for output?
+ *
+ * Avoid falling back to lptout() too quickly. First spin-loop
+ * to see if the printer will become ready ``really soon now''.
+ */
+ for (i = 0;
+ i < 100 &&
+ ((sts=inb(port+lpt_status)) & RDY_MASK) != LP_READY;
+ i++) ;
+ if ((sts & RDY_MASK) == LP_READY) {
sc->sc_state = (sc->sc_state | OBUSY) & ~ERROR;
+ sc->sc_backoff = hz/LPTOUTINITIAL;
if (sc->sc_xfercnt) {
/* send char */
@@ -822,6 +839,7 @@
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
(sc->sc_state & OPEN))
sc->sc_state |= ERROR;
+ /* lptout() will jump in and try to restart. */
}
lprintf("sts %x ", sts);
}
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)