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