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Bail after 5 attempts to read very noisy signals.

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This commit is contained in:
Poul-Henning Kamp 1999-07-03 08:23:00 +00:00
parent c31558b215
commit e366aade76
1 changed files with 6 additions and 4 deletions
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10
sys/pci/xrpu.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 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ---------------------------------------------------------------------------- * ----------------------------------------------------------------------------
* *
* $Id: xrpu.c,v 1.12 1999/05/31 11:29:04 phk Exp $ * $Id: xrpu.c,v 1.13 1999/06/22 10:31:30 phk Exp $
* *
* A very simple device driver for PCI cards based on Xilinx 6200 series * A very simple device driver for PCI cards based on Xilinx 6200 series
* FPGA/RPU devices. Current Functionality is to allow you to open and * FPGA/RPU devices. Current Functionality is to allow you to open and
@ -100,24 +100,26 @@ void
xrpu_poll_pps(struct timecounter *tc) xrpu_poll_pps(struct timecounter *tc)
{ {
struct softc *sc = tc->tc_priv; struct softc *sc = tc->tc_priv;
int i; int i, j;
unsigned count1, ppscount; unsigned count1, ppscount;
for (i = 0; i < XRPU_MAX_PPS; i++) { for (i = 0; i < XRPU_MAX_PPS; i++) {
if (sc->assert[i]) { if (sc->assert[i]) {
ppscount = *(sc->assert[i]) & tc->tc_counter_mask; ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
j = 0;
do { do {
count1 = ppscount; count1 = ppscount;
ppscount = *(sc->assert[i]) & tc->tc_counter_mask; ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
} while (ppscount != count1); } while (ppscount != count1 && ++j < 5);
pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTUREASSERT); pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTUREASSERT);
} }
if (sc->clear[i]) { if (sc->clear[i]) {
j = 0;
ppscount = *(sc->clear[i]) & tc->tc_counter_mask; ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
do { do {
count1 = ppscount; count1 = ppscount;
ppscount = *(sc->clear[i]) & tc->tc_counter_mask; ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
} while (ppscount != count1); } while (ppscount != count1 && ++j < 5);
pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTURECLEAR); pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTURECLEAR);
} }
} }