# Error: Read(64 bytes) failed Write(64 bytes) failed

**URL:** <https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700>\
**Category:** LimeSDR\
**Created:** [15 May 2019 02:34 UTC](https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700 "2019-05-15T02:34:05Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mauro](https://avatars.discourse-cdn.com/v4/letter/m/45deac/32.png) [@mauro](https://discourse.myriadrf.org/u/mauro)\
**Post date:** [15 May 2019 02:34 UTC](https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700/1 "2019-05-15T02:34:05Z")

</div>

Hi all

I made a program using the LimeSuiteAPI(LMS API). The program and the board were working quite well until now. In the last two weeks I started to get these errors “Read/Write (64 bytes) fail” message while the program was running (program execution is interrupted before it can ends lossing all the information that was collected before the error appeared).

Looking in the forum I discovered that the problem I am experiencing is very similar to the problem detailed in these two post:

> [@LimeSDR gives Gateware version 0 / 257 when cold, is OK when warmed up](https://discourse.myriadrf.org/t/limesdr-gives-gateware-version-0-257-when-cold-is-ok-when-warmed-up/2711):
>
> Hello all, Today I ran LimeUtil --update my LimeSDR, which was working fine so far, And yes, once done, I experienced the “Gateware version 0, revision 0” bug (actually I experienced “Read(64 bytes) error” and some Write errors too), but then I did a LimeUtil --make and that’s when I saw the “version 0, revision 0” line) and searching the Web, I saw than I was not the only one. I knew I had not made a single HW modification, so the only cause could be software – the upgrade. So I thought maybe …

> [@LimeSDR hardware problem: USB controller?](https://discourse.myriadrf.org/t/limesdr-hardware-problem-usb-controller/4637):
>
> Hi, I am having issues with my LimeSDR USB (v1.4s). When I first got it it was working fine, and has performed correctly for the next months or so. Then, it started giving me symptoms such as: not replying correctly to any commands (the infamous " Read ( 64 bytes ) failed") flashing firmwares not working (incorrect gateware version 0 rev 0 upon completion) It was random at first, and disconnecting/reconnecting power supply would fix it, then it got worse and worse to the point that now, my …

The problem is intermittent: sometimes I am able to run the program from start to end successfully many times one after another, and sometimes I can’t run it even a single time.

The problem tends to manifest more when the ambient temperature is low (specially when the board is started from cold). Connecting the board a few minutes before it’s use (warming-up) ussually helps to avoid the error. If the board is cooled with a fan the problem appears more frequently during it’s operation (I always have a fan cooling the LimeSDR, the fan is totally independent from the Lime).

As and example I have run the LimeQuickTest twice:  
1-first one with the board connected from cold (result: the read/write error appears and the result is -Board tests FAILED- , see execution result below)  
2-board is connected and left a few minutes warmup before running the Test (result: Board tests PASSED)

Connecting to the board (from a cold start) using the GUI can also show up the Read/Write error. Sometimes I am able to run the QuickTest (selftest.ini) from the GUI with out problems, and sometimes the QuickTest freezes (data transfer stops) and the read/write error appears in the info/log section of the GUI.

The board is useless for my project as the problem becomes more frequent.  
I would like to hear Lime’s experts comments/solutions on this issue.

Regards  
Mauro

> mauro@ln:~$ LimeQuickTest  
> [TESTING STARTED]  
> -\>Start time: Tue May 14 20:55:30 2019
> 
> Read(64 bytes) failed  
> Gateware version mismatch!  
> Expected gateware version 2, revision 20  
> But found version 0, revision 0  
> Follow the FW and FPGA upgrade instructions:  
> [Lime Suite - Myriad-RF Wiki](http://wiki.myriadrf.org/Lime_Suite#Flashing_images)  
> Or run update on the command line: LimeUtil --update
> 
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> -\>Device: LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, serial=0009072C02872519  
> Serial Number: 0009072C02872519  
> Read(64 bytes) failed
> 
> [Clock Network Test]  
> -\>FX3 GPIF clock test  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> -\>FX3 GPIF clock test FAILED  
> -\>Si5351C test  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> FAILED  
> -\>ADF4002 Test  
> Read(64 bytes) failed  
> FAILED  
> -\>VCTCXO test  
> Read(64 bytes) failed  
> FAILED  
> -\>Clock Network Test FAILED
> 
> [FPGA EEPROM Test]  
> -\>Read EEPROM  
> -\>Read data: 12 07 17 12 07 17 02  
> -\>FPGA EEPROM Test PASSED
> 
> [LMS7002M Test]  
> -\>Perform Registers Test  
> Read(64 bytes) failed  
> SPI\_write() failed  
> Read(64 bytes) failed  
> SPI\_write() failed  
> Read(64 bytes) failed  
> SPI\_write() failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> -\>LMS7002M Test FAILED
> 
> [RF Loopback Test]  
> Note: The test should be run without anything connected to RF ports  
> -\>Configure LMS  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> SetFrequencyCGEN(491.52 MHz) failed  
> Failed to set sample rate  
> -\>RF Loopback Test FAILED
> 
> =\> Board tests FAILED \<=
> 
> Elapsed time: 0.16 seconds
> 
> mauro@ln:~$  
> mauro@ln:~$  
> mauro@ln:~$ LimeUtil --update  
> Connected to [LimeSDR-USB [USB 3.0] 9072C02872519]  
> Read(64 bytes) failed  
> Gateware version mismatch!  
> Expected gateware version 2, revision 20  
> But found version 0, revision 0  
> Follow the FW and FPGA upgrade instructions:  
> [Lime Suite - Myriad-RF Wiki](http://wiki.myriadrf.org/Lime_Suite#Flashing_images)  
> Or run update on the command line: LimeUtil --update
> 
> Read(64 bytes) failed  
> Existing firmware is same as update (4)  
> [100%] 579832/579832 Bytes programming: completed (/usr/share/LimeSuite/images/19.01/LimeSDR-USB\_HW\_1.4\_r2.20.rbf)  
> Programming update complete!  
> mauro@ln:~$  
> mauro@ln:~$  
> mauro@ln:~$ LimeQuickTest  
> [TESTING STARTED]  
> -\>Start time: Tue May 14 20:55:58 2019
> 
> Read(64 bytes) failed  
> -\>Device: LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, serial=0009072C02872519  
> Serial Number: 0009072C02872519
> 
> [Clock Network Test]  
> -\>FX3 GPIF clock test  
> Read(64 bytes) failed  
> Test results: 19638; 23394; 27150 - PASSED  
> -\>Si5351C test  
> CLK0: 17554 / 17554 - PASSED  
> CLK1: 17554 / 17554 - PASSED  
> CLK2: 17554 / 17554 - PASSED  
> CLK3: 17554 / 17554 - PASSED  
> CLK4: 17554 / 17554 - PASSED  
> CLK5: 17554 / 17554 - PASSED  
> CLK6: 17554 / 17554 - PASSED  
> -\>ADF4002 Test  
> Result: 10 - PASSED  
> -\>VCTCXO test  
> Read(64 bytes) failed  
> FAILED  
> -\>Clock Network Test FAILED
> 
> [FPGA EEPROM Test]  
> -\>Read EEPROM  
> -\>Read data: 12 07 17 12 07 17 02  
> -\>FPGA EEPROM Test PASSED
> 
> [LMS7002M Test]  
> -\>Perform Registers Test  
> Read(64 bytes) failed  
> -\>LMS7002M Test FAILED
> 
> [RF Loopback Test]  
> Note: The test should be run without anything connected to RF ports  
> -\>Configure LMS  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> Read(64 bytes) failed  
> TuneVCO(CGEN) - failed to lock (cmphl!=0)  
> SetFrequencyCGEN(80 MHz) failed  
> TuneVCO(CGEN) - failed to lock (cmphl!=0)  
> SetFrequencyCGEN(491.52 MHz) failed  
> Failed to set sample rate  
> -\>RF Loopback Test FAILED
> 
> =\> Board tests FAILED \<=
> 
> Elapsed time: 2.69 seconds

Board connected and wait some time to warmup before running the LimeQuickTest:

> mauro@ln:~$ LimeQuickTest  
> [TESTING STARTED]  
> -\>Start time: Tue May 14 21:02:52 2019
> 
> -\>Device: LimeSDR-USB, media=USB 3.0, module=FX3, addr=1d50:6108, serial=0009072C02872519  
> Serial Number: 0009072C02872519
> 
> [Clock Network Test]  
> -\>FX3 GPIF clock test  
> Test results: 21266; 25022; 28778 - PASSED  
> -\>Si5351C test  
> CLK0: 17555 / 17554 - PASSED  
> CLK1: 17555 / 17554 - PASSED  
> CLK2: 17555 / 17554 - PASSED  
> CLK3: 17555 / 17554 - PASSED  
> CLK4: 17555 / 17554 - PASSED  
> CLK5: 17555 / 17554 - PASSED  
> CLK6: 17555 / 17554 - PASSED  
> -\>ADF4002 Test  
> Result: 10 - PASSED  
> -\>VCTCXO test  
> Results : 5112975 (min); 5113115 (max) - PASSED  
> -\>Clock Network Test PASSED
> 
> [FPGA EEPROM Test]  
> -\>Read EEPROM  
> -\>Read data: 12 07 17 12 07 17 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]  
> Note: The test should be run without anything connected to RF ports  
> -\>Configure LMS  
> -\>Run Tests (TX\_2-\> LNA\_L):  
> CH0 (SXR=800.0MHz, SXT=805.0MHz): Result:(-13.9 dBFS, 5.00 MHz) - PASSED  
> CH1 (SXR=800.0MHz, SXT=805.0MHz): Result:(-16.1 dBFS, 5.00 MHz) - PASSED  
> -\>Run Tests (TX\_1 → LNA\_W):  
> CH0 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-17.4 dBFS, 5.00 MHz) - PASSED  
> CH1 (SXR=1800.0MHz, SXT=1805.0MHz): Result:(-18.1 dBFS, 5.00 MHz) - PASSED  
> -\>Run Tests (TX\_2-\> LNA\_H):  
> CH0 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-17.4 dBFS, 5.00 MHz) - PASSED  
> CH1 (SXR=2500.0MHz, SXT=2505.0MHz): Result:(-13.5 dBFS, 5.00 MHz) - PASSED  
> -\>RF Loopback Test PASSED
> 
> =\> Board tests PASSED \<=
> 
> Elapsed time: 1.52 seconds

 ![Screenshot%20from%202019-05-14%2022-40-05](https://canada1.discourse-cdn.com/flex034/uploads/myriadrf/original/2X/5/552364d800729283fb72671483e671b77bd08062.png)

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<div class="post-metadata">

**Author:** ![Zack](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/zack/32/89_2.png) [@Zack](https://discourse.myriadrf.org/u/Zack)\
**Post date:** [21 May 2019 09:45 UTC](https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700/2 "2019-05-21T09:45:59Z")

</div>

Hi @mauro,

It looks like FX3 of FPGA soldering issue. Check with Crowd Supply if RMA is applicable.

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<div class="post-metadata">

**Author:** ![mauro](https://avatars.discourse-cdn.com/v4/letter/m/45deac/32.png) [@mauro](https://discourse.myriadrf.org/u/mauro)\
**Post date:** [24 May 2019 02:05 UTC](https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700/3 "2019-05-24T02:05:56Z")

</div>

Hi Zack,

Thanks for the answer.  
As you said it looks like HW problem (soldering issue). No chance to be related to firmware bug, correct?

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<div class="post-metadata">

**Author:** ![Zack](https://yyz2.discourse-cdn.com/flex034/user_avatar/discourse.myriadrf.org/zack/32/89_2.png) [@Zack](https://discourse.myriadrf.org/u/Zack)\
**Post date:** [24 May 2019 05:37 UTC](https://discourse.myriadrf.org/t/error-read-64-bytes-failed-write-64-bytes-failed/4700/4 "2019-05-24T05:37:23Z")

</div>

Hi @mauro,

> [@mauro](#):
>
> No chance to be related to firmware bug, correct?

Correct.