How to fix the error: Tx Calibration: MCU error 4 (SXT tune failed)

sqf.ice · 18 April 2020 11:23

I have the same problem, 1.30gateway

Wisaam · 20 July 2020 08:40

Same error.

[ERROR] Tx Calibration: MCU error 4 (SXT tune failed)

Anyone been able to fix this reliably? cooling and low power issues haven’t resolved this.

andrewback · 20 July 2020 09:52

Can you try building Lime Suite from source using the master branch.

https://wiki.myriadrf.org/Lime_Suite#Building_from_source

(omit the step that checks out the stable branch)

theo · 28 July 2020 09:10

@andrewback, I tried to build LimeSuite from source as you said but it does not change the error.

Bourascom · 28 July 2020 09:22

@andrewback
I built LimeSuite from source using the latest commit as you advised, but still get the same error "Tx calibration:MCU error 4 (SXT tune failed) when I run srsenb.

Bourascom · 28 July 2020 09:32

External supply solved this problem ?

BlackF · 4 October 2020 20:49

Any update on this error?

en1gma · 9 October 2020 11:01

i get this error every time i try to calibrate. i always have to go into stx and do the settings there first then calibrate.

why cant they fix this. you would think it would be simple.

andrewback · 10 October 2020 10:06

What version of Lime Suite are you using? And could you try building from git master.

andrewback · 13 October 2020 13:22

Looks from your post from October 2019 that your board is failing LimeQuickTest?

andrewback · 13 October 2020 13:25

@en1gma @BlackF @Bourascom could you please run LimeQuickTest and post the results if these contain any failures.

BlackF · 13 October 2020 17:39

No Fails for me when running LimeQuickTest

andrewback · 13 October 2020 19:03

Thanks, if you could post the output when running the eNodeB, showing the error.

BlackF · 13 October 2020 23:29

Freshly compiled from master

$ ./build/srsenb/src/srsenb --rf.device_name soapy
linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

---  Software Radio Systems LTE eNodeB  ---

Reading configuration file /etc/srslte/enb.conf...

Built in Release mode using commit 0ec49a7b1 on branch master.

Opening 1 channels in RF device=soapy with args=default
Soapy has found device #0: addr=24607:1027, driver=lime, label=LimeSDR Mini [USB 3.0] 1D588F01B6A2F2, media=USB 3.0, module=FT601, name=LimeSDR Mini, serial=1D588F01B6A2F2, 
Selecting Soapy device: 0
[INFO] Make connection: 'LimeSDR Mini [USB 3.0] 1D588F01B6A2F2'
[INFO] Reference clock 40.00 MHz
[INFO] Device name: LimeSDR-Mini
[INFO] Reference: 40 MHz
[INFO] LMS7002M register cache: Disabled
Setting up Rx stream with 1 channel(s)
Setting up Tx stream with 1 channel(s)
[INFO] RX LPF configured
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Available device sensors: 
 - clock_locked
 - lms7_temp
Available sensors for Rx channel 0: 
 - lo_locked
[ERROR] Tx Calibration: MCU error 4 (SXT tune failed)
[INFO] Rx calibration finished
State of gain elements for Rx channel 0 (AGC not supported):
 - TIA: 9.00 dB
 - LNA: 30.00 dB
 - PGA: -4.00 dB
State of gain elements for Tx channel 0 (AGC not supported):
 - PAD: 45.00 dB
 - IAMP: 0.00 dB
Rx antenna set to LNAH
Tx antenna set to BAND1
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory

==== eNodeB started ===
Type <t> to view trace
[INFO] RX LPF configured
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 11.52 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz for cc_idx=0

Tested with latest LimeSuite version from Master too (20.07.2-gccb39226).
OS: Ubuntu 18.04

adim · 14 October 2020 16:23

This is a result of my investigation and subsequent workaround implemented two years ago in stream management. With my application (which has an additional layer through gr-osmosdr wrapping SoapySDR) I can reproduce this error or lack of reliably by adding or removing the workaround.

Steps to reproduce and generated console output below:

Workaround is in place, RX stream stopped prior to creation of TX stream:

Create and start SoapySDR RX stream
===================

gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.2.0
built-in source types: file fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy airspyhf soapy redpitaya freesrp
[INFO] Make connection: ‘LimeNET-Micro [USB 2.0] 583A25BFD101’
[INFO] Reference clock 30.72 MHz
[INFO] Device name: LimeNET-Micro
[INFO] Reference: 30.72 MHz
[INFO] LMS7002M register cache: Disabled
[INFO] Selected RX path: LNAL
[INFO] RX LPF configured
[INFO] Rx calibration finished

RX stream stopped (not destroyed), TX stream created and started
===================
gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.2.0
built-in sink types: uhd hackrf bladerf soapy redpitaya freesrp file
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[WARNING] TXLPF set to 5.000 MHz (requested 1.000 MHz [out of range])
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[INFO] Selected TX path: Band 2
[WARNING] TXLPF set to 5.000 MHz (requested 1.500 MHz [out of range])
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[INFO] Tx calibration finished

After TX stream started, RX stream is resumed (part of workaround)

No workaround in place, RX stream is not stopped prior to start of TX stream.

gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.2.0
built-in source types: file fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy airspyhf soapy redpitaya freesrp
[INFO] Make connection: ‘LimeNET-Micro [USB 2.0] 583A25BFD101’
[INFO] Reference clock 30.72 MHz
[INFO] Device name: LimeNET-Micro
[INFO] Reference: 30.72 MHz
[INFO] LMS7002M register cache: Disabled
[INFO] Selected RX path: LNAL
[INFO] RX LPF configured
[INFO] Rx calibration finished

At this point samples are flowing through the RX stream

TX stream start

gr-osmosdr 0.2.0.0 (0.2.0) gnuradio 3.8.2.0
built-in sink types: uhd hackrf bladerf soapy redpitaya freesrp file
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[ERROR] Tx Calibration: MCU error 4 (SXT tune failed)
[WARNING] TXLPF set to 5.000 MHz (requested 1.000 MHz [out of range])
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[INFO] Selected TX path: Band 2
[WARNING] TXLPF set to 5.000 MHz (requested 1.500 MHz [out of range])
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
[INFO] Tx calibration finished

Observe error at line 5 at final step above.
And apologies for the formatting.

Regards,
Adrian

en1gma · 14 October 2020 22:06

I did the LimeQuickTest with two different Gatewares:

en1gma@M4800:~$ LimeQuickTest
[ TESTING STARTED ]
->Start time: Wed Oct 14 17:03:32 2020

->Device: LimeSDR Mini, media=USB 3.0, module=FT601, addr=24607:1027, serial=1D3BD0C4F0CDFF, HW=1, GW=1.28
Serial Number: 1D3BD0C4F0CDFF
Chip temperature: 45 C

[ Clock Network Test ]
->REF clock test
Test results: 2563; 15760; 28957 - PASSED
->VCTCXO test
Results : 6710985 (min); 6711150 (max) - PASSED
->Clock Network Test PASSED

[ FPGA EEPROM Test ]
->Read EEPROM
->Read data: 12 03 10 12 03 10 02
->FPGA EEPROM Test PASSED

[ LMS7002M Test ]
->Perform Registers Test
->External Reset line test
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
Reg 0x20: value after reset 0x0FFFF
->LMS7002M Test PASSED

[ RF Loopback Test ]
->Configure LMS
->Run Tests (TX_2 → LNA_W):
CH0 (SXR=1000.0MHz, SXT=1005.0MHz): Result:(-28.6 dBFS, 5.00 MHz) - FAILED
->Run Tests (TX_1 → LNA_H):
CH0 (SXR=2100.0MHz, SXT=2105.0MHz): Result:(-11.7 dBFS, 5.00 MHz) - PASSED
->RF Loopback Test FAILED

=> Board tests FAILED <=

Elapsed time: 2.47 seconds

en1gma@M4800:~$ LimeQuickTest
[ TESTING STARTED ]
->Start time: Wed Oct 14 17:05:24 2020

->Device: LimeSDR Mini, media=USB 3.0, module=FT601, addr=24607:1027, serial=1D3BD0C4F0CDFF, HW=1, GW=1.30
Serial Number: 1D3BD0C4F0CDFF
Chip temperature: 45 C

[ Clock Network Test ]
->REF clock test
Test results: 2318; 15515; 28712 - PASSED
->VCTCXO test
Results : 6710985 (min); 6711151 (max) - PASSED
->Clock Network Test PASSED

[ FPGA EEPROM Test ]
->Read EEPROM
->Read data: 12 03 10 12 03 10 02
->FPGA EEPROM Test PASSED

[ LMS7002M Test ]
->Perform Registers Test
->External Reset line test
Reg 0x20: Write value 0xFFFD, Read value 0xFFFD
Reg 0x20: value after reset 0x0FFFF
->LMS7002M Test PASSED

[ RF Loopback Test ]
->Configure LMS
->Run Tests (TX_2 → LNA_W):
CH0 (SXR=1000.0MHz, SXT=1005.0MHz): Result:(-28.7 dBFS, 5.00 MHz) - FAILED
->Run Tests (TX_1 → LNA_H):
CH0 (SXR=2100.0MHz, SXT=2105.0MHz): Result:(-11.7 dBFS, 5.00 MHz) - PASSED
->RF Loopback Test FAILED

=> Board tests FAILED <=

Elapsed time: 2.45 seconds

en1gma@M4800:~$

Zack · 15 October 2020 06:14

Hi @BlackF,

Could you try to tune SXT using LimeSuiteGUI and check if it can deliver the LO frequency of
2685.0 Mhz. Perform these steps:

Connect to the board;
Push “Default” button;
Go to SXT tab, set “Frequency” to 2685 MHz and push “Calculate” button;
Check “VCO Comparators” values. High should be 1; Low should be 0;
Copy and share log output here, please.

BlackF · 15 October 2020 07:20

HI @Zack,

[10:18:40] INFO: Disconnected control port
[10:19:00] INFO: Reference clock 40.00 MHz
[10:19:00] INFO: Connected Control port: LimeSDR-Mini FW:6 HW:3 Protocol:1 GW:1.30 Ref Clk: 40.00 MHz
[10:19:06] INFO: SXT frequency set to 2685.000000 MHz

As you said, the “VCO Comparators” values are: High 1; Low 0;

Here is the same test with DEBUG enabled

[10:21:49] INFO: Disconnected control port
[10:21:58] DEBUG: Claimed Interface
[10:21:58] DEBUG: Estimated reference clock 40.0016 MHz
[10:21:58] INFO: Reference clock 40.00 MHz
[10:21:58] INFO: Connected Control port: LimeSDR-Mini FW:6 HW:3 Protocol:1 GW:1.30 Ref Clk: 40.00 MHz
[10:22:03] DEBUG: INT 57, FRAC 385875, DIV_OUTCH_CGEN 18
[10:22:03] DEBUG: VCO 2334.72 MHz, RefClk 40.00 MHz
[10:22:03] DEBUG: csw 153; interval [150, 156]
[10:22:03] DEBUG: INT 57, FRAC 385875, DIV_OUTCH_CGEN 18
[10:22:03] DEBUG: VCO 2334.72 MHz, RefClk 40.00 MHz
[10:22:03] DEBUG: csw 153; interval [150, 156]
[10:22:03] DEBUG: M=160, N=4, Fvco=614.400 MHz
[10:22:03] DEBUG: M=160, N=4, Fvco=614.400 MHz
[10:22:20] DEBUG: INT 130, FRAC 262144, DIV_LOCH 0, EN_DIV2_DIVPROG 0
[10:22:20] DEBUG: VCO 5370.00 MHz, RefClk 40.00 MHz
[10:22:20] DEBUG: ICT_VCO: 192
[10:22:20] DEBUG: TuneVCO(SXT) - VCO too low
[10:22:20] DEBUG: VCOL : csw=0 tune fail
[10:22:20] DEBUG: ICT_VCO: 192
[10:22:20] DEBUG: csw=64	cmphl=3
[10:22:20] DEBUG: csw=32	cmphl=0
[10:22:20] DEBUG: csw=48	cmphl=0
[10:22:20] DEBUG: csw=56	cmphl=2
[10:22:20] DEBUG: csw=60	cmphl=2
[10:22:20] DEBUG: csw=62	cmphl=2
[10:22:20] DEBUG: csw=63	cmphl=2
[10:22:20] DEBUG: CSW: lowest=55, highest=63, selected=59
[10:22:20] DEBUG: csw=192	cmphl=3
[10:22:20] DEBUG: csw=160	cmphl=3
[10:22:20] DEBUG: csw=144	cmphl=3
[10:22:20] DEBUG: csw=136	cmphl=3
[10:22:20] DEBUG: csw=132	cmphl=3
[10:22:20] DEBUG: csw=130	cmphl=3
[10:22:20] DEBUG: csw=129	cmphl=3
[10:22:20] DEBUG: Failed to lock
[10:22:20] DEBUG: cmphl=2
[10:22:20] DEBUG: VCOM : csw=59 tune ok
[10:22:20] DEBUG: ICT_VCO: 192
[10:22:20] DEBUG: TuneVCO(SXT) - VCO too high
[10:22:20] DEBUG: VCOH : csw=0 tune fail
[10:22:20] DEBUG: Selected: VCOM
[10:22:20] INFO: SXT frequency set to 2685.000000 MHz

Zack · 15 October 2020 07:53

Hi @BlackF,

Thanks for information. Let me check.

BlackF · 23 October 2020 20:56

Thank you @Zack. Today (23/10) I took the liberty to recompile LimeSuite (20.07.2-gf2d96ff0) since I saw various changes around calibration.
Please find the srsenb output bellow

$ ./build/srsenb/src/srsenb --rf.device_name soapy
linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

---  Software Radio Systems LTE eNodeB  ---

Reading configuration file /etc/srslte/enb.conf...

Built in Release mode using commit 0ec49a7b1 on branch master.

Opening 1 channels in RF device=soapy with args=default
Soapy has found device #0: addr=24607:1027, driver=lime, label=LimeSDR Mini [USB 3.0] 1D588F01B6A2F2, media=USB 3.0, module=FT601, name=LimeSDR Mini, serial=1D588F01B6A2F2, 
Selecting Soapy device: 0
[INFO] Make connection: 'LimeSDR Mini [USB 3.0] 1D588F01B6A2F2'
[INFO] Reference clock 40.00 MHz
[INFO] Device name: LimeSDR-Mini
[INFO] Reference: 40 MHz
[INFO] LMS7002M register cache: Disabled
Setting up Rx stream with 1 channel(s)
Setting up Tx stream with 1 channel(s)
[INFO] RX LPF configured
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 5 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Available device sensors: 
 - clock_locked
 - lms7_temp
Available sensors for Rx channel 0: 
 - lo_locked
[INFO] Tx calibration finished
[INFO] Rx calibration finished
State of gain elements for Rx channel 0 (AGC not supported):
 - TIA: 9.00 dB
 - LNA: 30.00 dB
 - PGA: -4.00 dB
State of gain elements for Tx channel 0 (AGC not supported):
 - PAD: 45.00 dB
 - IAMP: 0.00 dB
Rx antenna set to LNAH
Tx antenna set to BAND1
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
Warning: Failed to create thread with real-time priority. Creating it with normal priority: Cannot allocate memory
connect(): Connection refused
Failed to initiate SCTP socket. Attempting reconnection in 10 seconds

==== eNodeB started ===
Type <t> to view trace
[INFO] RX LPF configured
[INFO] Filter calibrated. Filter order-4th, filter bandwidth set to 11.52 MHz.Real pole 1st order filter set to 2.5 MHz. Preemphasis filter not active
[INFO] TX LPF configured
Setting frequency: DL=2685.0 Mhz, UL=2565.0 MHz for cc_idx=0

I don’t see the error now
Thank you all