50 lines
1.7 KiB
Diff
50 lines
1.7 KiB
Diff
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From 9b12594ed0ce769d923a3b4f4d42c3b25caa87d3 Mon Sep 17 00:00:00 2001
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From: Oliver Smith <osmith@sysmocom.de>
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Date: Tue, 13 Dec 2022 15:25:52 +0100
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Subject: [PATCH] tsip: configure and enable 1PPS
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Rebase of gpsd-tsip-pps.patch we have been carrying:
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From www/time-service-intro.adoc:
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> GPS enables receivers to generate a pulse-per-second
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> signal ("1PPS" or just "PPS") accurate to the top of the current
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> UTC second within 50 ns.
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---
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drivers/driver_tsip.c | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/drivers/driver_tsip.c b/drivers/driver_tsip.c
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index 57b97513c..673bbef7e 100644
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--- a/drivers/driver_tsip.c
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+++ b/drivers/driver_tsip.c
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@@ -4288,6 +4288,26 @@ void configuration_packets_generic(struct gps_device_t *session)
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/* Primary Receiver Configuration Parameters Request (0xbb-00)
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* returns Primary Receiver Configuration Block (0xbb-00) */
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(void)tsip_write1(session, "\xbb\x00", 2);
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+
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+ GPSD_LOG(LOG_PROG, &session->context->errout,
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+ "Configuring + Enabling 1PPS\n");
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+ /* enable 1pps */
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+ putbyte(buf, 0, 0x8e);
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+ putbyte(buf, 1, 0x4a);
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+ putbyte(buf, 2, 0x01);
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+ (void)tsip_write1(session, buf, 3);
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+
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+ /* request PPS only if at least one sat is visible */
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+ putbyte(buf, 0, 0x8e);
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+ putbyte(buf, 1, 0x4e);
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+ putbyte(buf, 2, 0x03);
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+ (void)tsip_write1(session, buf, 3);
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+
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+ /* request PPS and TSIP to use UTC time, not GPS */
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+ putbyte(buf, 0, 0x8e);
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+ putbyte(buf, 1, 0xa2);
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+ putbyte(buf, 2, 0x03);
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+ (void)tsip_write1(session, buf, 3);
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}
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/* configure Acutime Gold to a known state */
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--
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2.34.1
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