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Best version so far. Flicker floor is now 2e-12.

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This commit is contained in:
Poul-Henning Kamp 1998-12-16 11:46:41 +00:00
parent 6461ea0b8b
commit a2c8d39884
1 changed files with 28 additions and 15 deletions
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43
sys/i386/isa/loran.c
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@ -6,7 +6,7 @@
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: loran.c,v 1.12 1998/12/04 22:54:46 archie Exp $
* $Id: loran.c,v 1.13 1998/12/07 21:58:22 archie Exp $
*
* This device-driver helps the userland controlprogram for a LORAN-C
* receiver avoid monopolizing the CPU.
@ -50,7 +50,9 @@ struct datapoint {
TAILQ_ENTRY(datapoint) list;
u_char status;
int vco;
int bounce;
pid_t pid;
struct timespec when;
int priority;
dphead_t *home;
@ -215,8 +217,6 @@ static u_int vco_want;
static u_int64_t vco_when;
static int64_t vco_error;
static int lorantc_magic;
/**********************************************************************/
static int loranprobe (struct isa_device *dvp);
@ -279,8 +279,9 @@ loranattach(struct isa_device *isdp)
printf("loran0: LORAN-C Receiver\n");
vco_should = vco_is = VCO;
LOAD_DAC(DACA, vco_is >> VCO_SHIFT);
vco_should = VCO;
vco_is = vco_should >> VCO_SHIFT;
LOAD_DAC(DACA, vco_is);
init_tgc();
@ -365,7 +366,7 @@ loranenqueue(struct datapoint *dp)
{
struct datapoint *dpp, *dpn;
while(1) {
while(dp) {
/*
* The first two elements on "working" are sacred,
* they're already partly setup in hardware, so the
@ -428,13 +429,24 @@ loranenqueue(struct datapoint *dp)
dp->scheduled += dp->fri;
}
/*
* If anything was bumped, put it back as best we can
*/
if (TAILQ_EMPTY(&holding))
break;
dp = TAILQ_FIRST(&holding);
TAILQ_REMOVE(&holding, dp, list);
do {
/*
* If anything was bumped, put it back as best we can
*/
if (TAILQ_EMPTY(&holding)) {
dp = 0;
break;
}
dp = TAILQ_FIRST(&holding);
TAILQ_REMOVE(&holding, dp, list);
if (dp->home) {
if (!--dp->bounce) {
TAILQ_INSERT_TAIL(dp->home, dp, list);
wakeup((caddr_t)dp->home);
dp = 0;
}
}
} while (!dp);
}
}
@ -489,6 +501,7 @@ loranintr(int unit)
this = TAILQ_FIRST(&working);
TAILQ_REMOVE(&working, this, list);
nanotime(&this->when);
this->ssig = inb(ADC);
par &= ~(ENG | IEN);
@ -509,6 +522,7 @@ loranintr(int unit)
outb(ADC, ADC_S);
this->epoch = ticker;
this->vco = vco_is;
if (this->home) {
TAILQ_INSERT_TAIL(this->home, this, list);
@ -595,8 +609,7 @@ loran_get_timecount(struct timecounter *tc)
ef = read_eflags();
disable_intr();
if (!lorantc_magic)
outb(TGC, TG_SAVE + 0x10); /* save counter #5 */
outb(TGC, TG_SAVE + 0x10); /* save counter #5 */
outb(TGC, TG_LOADDP +0x15); /* hold counter #5 */
count = inb(TGD);
count |= inb(TGD) << 8;