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Re: [gpsd-users] Ublox EVK-M8T
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-users] Ublox EVK-M8T |
Date: |
Tue, 19 Sep 2017 17:36:17 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
Denny Page <address@hidden>:
> It doesn’t recognize a type.
>
> Starting condition is, unit set to 115200, port set to 115200, and
> gpsctl used to set binary mode.
OK. Just getting stuck in the hunt loop is much less weird. Not *good*,
but not inexplicable the way a false lock would be.
> However, if the “-b” option is used to gpsd, gpsd correctly identifies u-blox
> on the second packet:
That is evidence of something very specific going wrong.
Normally, when gpsd recognizes a type, it may try to send the device
mode-setting strings that put it in what gpsd considers an optimal mode.
In the case of the u-blox that code looks like this:
static void ubx_event_hook(struct gps_device_t *session, event_t event)
{
if (session->context->readonly)
return;
else if (event == event_identified) {
unsigned char msg[32];
gpsd_log(&session->context->errout, LOG_DATA, "UBX configure\n");
msg[0] = 0x03; /* SBAS mode enabled, accept testbed mode */
msg[1] = 0x07; /* SBAS usage: range, differential corrections
and integrity */
msg[2] = 0x03; /* use the maximum search range: 3 channels */
msg[3] = 0x00; /* PRN numbers to search for all set to 0 =>
auto scan */
msg[4] = 0x00;
msg[5] = 0x00;
msg[6] = 0x00;
msg[7] = 0x00;
(void)ubx_write(session, 0x06u, 0x16, msg, 8);
#ifdef RECONFIGURE_ENABLE
/*
* Turn off NMEA output, turn on UBX on this port.
*/
if (session->mode == O_OPTIMIZE) {
ubx_mode(session, MODE_BINARY);
} else {
ubx_mode(session, MODE_NMEA);
}
#endif /* RECONFIGURE_ENABLE */
} else if (event == event_deactivate) {
unsigned char msg[4] = {
0x00, 0x00, /* hotstart */
0x01, /* controlled software reset */
0x00
}; /* reserved */
gpsd_log(&session->context->errout, LOG_DATA, "UBX revert\n");
/* Reverting all in one fast and reliable reset */
(void)ubx_write(session, 0x06, 0x04, msg, 4); /* CFG-RST */
}
}
There are two operatioins here - switch to binary and enable SBAS.
The next diagnostics steps are:
1. Comment out both writes, try running without -b. Does it achieve sink?
2. Comment out one, then the other write. Which is the bad guy?
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
My work is funded by the Internet Civil Engineering Institute: https://icei.org
Please visit their site and donate: the civilization you save might be your own.
- Re: [gpsd-users] Ublox EVK-M8T, (continued)
- Re: [gpsd-users] Ublox EVK-M8T, John Klug, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, John Klug, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Eric S. Raymond, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, John Klug, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Eric S. Raymond, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Gary E. Miller, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/21
- Re: [gpsd-users] Ublox EVK-M8T,
Eric S. Raymond <=
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Gary E. Miller, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/19
- Re: [gpsd-users] Ublox EVK-M8T, Gary E. Miller, 2017/09/20
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/21
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/21
- Re: [gpsd-users] Ublox EVK-M8T, Gary E. Miller, 2017/09/21
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/21
- Re: [gpsd-users] Ublox EVK-M8T, Gary E. Miller, 2017/09/22
- Re: [gpsd-users] Ublox EVK-M8T, Denny Page, 2017/09/21