66 lines
2.2 KiB
Diff
66 lines
2.2 KiB
Diff
From a3dec2cbe5e539b5a270bed86eed78b283c79cdb Mon Sep 17 00:00:00 2001
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From: Daniel Golle <daniel@makrotopia.org>
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Date: Thu, 27 May 2021 01:18:20 +0200
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Subject: [PATCH] add support for Sierra Wireless qcserial NMEA-0183 interface
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Sierra Wireless EM 74xx modems come with a serial port outputting
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NMEA-0183 GPS sentences. In order to make it work, the magic string
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'$GPS_START' needs to be written to the modem, as only then the modem
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firmware starts sending NMEA-0183 output.
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Add option 'sierragpsstart' which if set to anything else than 0 will
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make kplex send the magic string when the device is opened.
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---
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serial.c | 13 ++++++++++---
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1 file changed, 10 insertions(+), 3 deletions(-)
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--- a/serial.c
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+++ b/serial.c
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@@ -24,6 +24,7 @@
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#include <pwd.h>
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#define DEFSERIALQSIZE 32
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+#define SIERRA_GPS_START "$GPS_START\n"
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struct if_serial {
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int fd;
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@@ -290,7 +291,8 @@ struct iface *init_serial (struct iface
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int ret;
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struct kopts *opt;
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int qsize=DEFSERIALQSIZE;
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-
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+ int send_gps_start = 0;
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+
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for(opt=ifa->options;opt;opt=opt->next) {
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if (!strcasecmp(opt->var,"filename"))
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devname=opt->val;
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@@ -324,7 +326,9 @@ struct iface *init_serial (struct iface
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logerr(0,"Invalid queue size specified: %s",opt->val);
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return(NULL);
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}
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- } else {
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+ } else if (!strcasecmp(opt->var, "sierragpsstart")) {
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+ send_gps_start=atoi(opt->val);
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+ } else {
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logerr(0,"unknown interface option %s",opt->var);
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return(NULL);
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}
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@@ -337,7 +341,7 @@ struct iface *init_serial (struct iface
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}
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/* Open interface or die */
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- if ((ifs->fd=ttyopen(devname,ifa->direction)) < 0) {
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+ if ((ifs->fd=ttyopen(devname, send_gps_start?BOTH:ifa->direction)) < 0) {
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return(NULL);
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}
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DEBUG(3,"%s: opened serial device %s for %s",ifa->name,devname,
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@@ -358,6 +362,9 @@ struct iface *init_serial (struct iface
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ifs->saved=1;
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ifs->slavename=NULL;
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+ if (send_gps_start)
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+ write(ifs->fd, SIERRA_GPS_START, strlen(SIERRA_GPS_START));
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+
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/* Assign pointers to read, write and cleanup routines */
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ifa->read=do_read;
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ifa->readbuf=read_serial;
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