Hi everyone,
recently I’ve got a LimeNET micro to play with simple cellular networks. I was trying to spawn a basic GSM base station with Osmocom GSM stack when I got an error about clock source.
Do I need to use an external clock source? For lab testing (t<30’) the internal clock should work fine.
$ sudo osmo-trx-lms
% 'rt-prio 18' is deprecated, use 'policy rr 18' under 'sched' node instead
Sat Jun 12 10:00:30 2021 DLGLOBAL <0008> telnet_interface.c:104 Available via telnet 127.0.0.1 4237
Sat Jun 12 10:00:30 2021 DLCTRL <000f> control_if.c:887 CTRL at 127.0.0.1 4236
Sat Jun 12 10:00:30 2021 DMAIN <0000> osmo-trx.cpp:563 Config Settings
Log Level............... 0
Device args.............
TRX Base Port........... 5700
TRX Address............. 127.0.0.1
GSM BTS Address......... 127.0.0.1
Channels................ 1
Tx Samples-per-Symbol... 4
Rx Samples-per-Symbol... 4
EDGE support............ 0
Extended RACH support... 0
Reference............... 0
Filler Burst Type....... Empty bursts
Filler Burst TSC........ 0
Filler Burst RACH Delay. 0
Multi-Carrier........... 0
LO freq. offset......... 0
RSSI to dBm offset...... 0 (relative)
Swap channels........... 0
Tx Antennas............. 'BAND1'
Rx Antennas............. 'LNAW'
Sat Jun 12 10:00:30 2021 DMAIN <0000> osmo-trx.cpp:481 Setting SCHED_RR priority 18. This setting is DEPRECATED, please use 'policy rr 18' under the 'sched' VTY node instead.
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:140 creating LMS device...
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:272 Opening LMS device..
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:278 Devices found: 1
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:288 Device [0]: LimeNET-Micro, media=USB 2.0, module=FT601, addr=24607:1027, serial=005839EC8507E7
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:297 Using device[0]
Sat Jun 12 10:00:30 2021 DDEVDRV <0006> LMSDevice.cpp:187 Reference clock 30.72 MHz
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:126 Device identified as LimeNET-Micro
Sat Jun 12 10:00:30 2021 DDEV <0005> LMSDevice.cpp:324 Init LMS device
Sat Jun 12 10:00:31 2021 DDEV <0005> LMSDevice.cpp:332 Setting Internal clock reference
Sat Jun 12 10:00:31 2021 DDEV <0005> LMSDevice.cpp:482 Device type LimeNET-Micro doesn't support internal reference clock
Sat Jun 12 10:00:31 2021 DDEV <0005> LMSDevice.cpp:377 Error in LMS open, closing:
Sat Jun 12 10:00:31 2021 DMAIN <0000> osmo-trx.cpp:597 Failed to create radio device
Sat Jun 12 10:00:31 2021 DMAIN <0000> osmo-trx.cpp:568 Shutting down transceiver...
Sat Jun 12 10:00:31 2021 DDEV <0005> LMSDevice.cpp:158 Closing LMS device
Reference guide: https://lucasteske.medium.com/creating-your-own-gsm-network-with-limesdr-1935bac257f4
That’s strange. It’s a while since I’ve run this up on a LimeNET Micro, but it should work and you absolutely should not require an external clock, as it has an integrated GPS disciplined OCXO.
You could try setting in the osmo-trx-lms config file:
clock-ref external
Just to see if it it has somehow been inverted and treats the GPSDO as external.
I see also that you have raised an issue on the Osmocom tracker, so hopefully someone will respond there.
I asked in osmocom chat and a moderator suggested to open an issue.
By setting the clock to external, do I need to provide an external TTL signal?
I successfully get most of the osmo stack to run on the LimeNET Micro by using this thread Osmo-bsc and OpenBSC on rPi4 with Limesdr Ubuntu Server 20.04 LTS
I tried to run osmo-trx-lms using the config files here https://github.com/work423/limesdr-mini
yet I still get an error, this time for antenna configuration.
Mon Jun 14 22:12:51 2021 DLSTATS <000d> stats.c:207 Stats timer started with interval 5 sec
Mon Jun 14 22:12:51 2021 DLGLOBAL <0004> telnet_interface.c:104 Available via telnet 127.0.0.1 4237
Mon Jun 14 22:12:51 2021 DLCTRL <000b> control_if.c:887 CTRL at 127.0.0.1 4236
Mon Jun 14 22:12:51 2021 DMAIN <0000> osmo-trx.cpp:480 [tid=281473274286096] Config Settings
Log Level............... 3
Device args.............
TRX Base Port........... 5700
TRX Address............. 127.0.0.1
GSM BTS Address......... 127.0.0.1
Channels................ 1
Tx Samples-per-Symbol... 4
Rx Samples-per-Symbol... 4
EDGE support............ 0
Extended RACH support... 0
Reference............... 0
C0 Filler Table......... 2
Multi-Carrier........... 0
Tuning offset........... 0
RSSI to dBm offset...... 0
Swap channels........... 0
Tx Antennas............. 'BAND1'
Rx Antennas............. 'LNAW'
Mon Jun 14 22:12:51 2021 DMAIN <0000> osmo-trx.cpp:436 [tid=281473274286096] Setting SCHED_RR priority 18
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:54 [tid=281473274286096] creating LMS device...
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:141 [tid=281473274286096] Opening LMS device..
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:147 [tid=281473274286096] Devices found: 1
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:157 [tid=281473274286096] Device [0]: LimeNET-Micro, media=USB 2.0, module=FT601, addr=24607:1027, serial=005839EC8507E7
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:166 [tid=281473274286096] Using device[0]
Mon Jun 14 22:12:51 2021 DLMS <0003> LMSDevice.cpp:94 [tid=281473274286096] Reference clock 30.72 MHz
Mon Jun 14 22:12:51 2021 DDEV <0002> LMSDevice.cpp:192 [tid=281473274286096] Init LMS device
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:99 [tid=281473274286096] Sample Rate: Min=100000 Max=3.072e+07 Step=1.39067e-309
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:228 [tid=281473274286096] Setting sample rate to 1.08333e+06 4
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:234 [tid=281473274286096] Sample Rate: Host=1.08333e+06 RF=3.46667e+07
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:487 [tid=281473274286096][chan=0] Invalid Rx Antenna
Mon Jun 14 22:12:52 2021 DMAIN <0000> LMSDevice.cpp:205 [tid=281473274286096] Failed configuring channel 0 with antenna LNAW
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:241 [tid=281473274286096] LMS antenna setting failed
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:254 [tid=281473274286096] Error in LMS open, closing:
Mon Jun 14 22:12:52 2021 DMAIN <0000> osmo-trx.cpp:514 [tid=281473274286096] Failed to create radio device
Mon Jun 14 22:12:52 2021 DMAIN <0000> osmo-trx.cpp:485 [tid=281473274286096] Shutting down transceiver...
Mon Jun 14 22:12:52 2021 DDEV <0002> LMSDevice.cpp:65 [tid=281473274286096] Closing LMS device
I’m sorry I still don’t get what’s wrong in the configuration file
I tried different channels but apparently it only spins with channel 0, while giving the error above.
stats interval 5
!
line vty
no login
!
trx
bind-ip 127.0.0.1
remote-ip 127.0.0.1
rx-sps 4
tx-sps 4
rt-prio 18
multi-arfcn disable
swap-channels disable
egprs disable
chan 0
rx-path LNAW
tx-path BAND1
The linked diagram shows than LMS7002M LNAW ports are not connected.
You’ve tried using LNAL or LNAH? As described here:
https://osmocom.org/projects/osmotrx/wiki/LimeSDR_Family#LimeNet-Micro
?
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