Hi Brad,
On Fri, 15 Feb 2019 at 10:32, Brad Kahn <bradkah...@gmail.com> wrote: > Hi All, > > New to the Casper toolflow and hardware so please bear with us. > We are trying to get up and running with the SNAP board by going through > the tutorials from the 2018 workshop > <https://github.com/casper-astro/tutorials_devel/tree/workshop2018>. > We can compile and run tutorial 1 successfully, indicating that the > toolflow and software versions are okay (hopefully). > Excellent -- that is no small feat! > > Unfortunately, we are hitting a problem for* Tutorial 3 (Wideband > Spectrometer)* > After supplying a 10Mhz ref at 8dBm, we power up the snap and try to run > the Python script with the precompiled .fpg file > <https://github.com/casper-astro/tutorials_devel/tree/workshop2018/vivado/snap/tut_spec> > : > > python snap_tut_spec.py '192.168.0.2' -b snap_tut_spec.fpg > > > We hit an error when the script attempts: > > adc.init(samplingRate=sample_rate, numChannel=1, resolution=8) > > During this function call, we notice that the *Ethernet connection > between the RPi and PC drops for a few seconds* and then we get this > error (extended error message at the end): > > KatcpRequestFail: Request write on host 192.168.0.2 failed. > Request: ?write adc16_controller 0 \0\0 > Reply: !write fail > > We tried extending the timeout period but this doesn't seem to help. > > We first tried using casperfpga libraries from casper-astro github > (pointed to from the casper-astro/tutorials_devel > <https://github.com/casper-astro/tutorials_devel/tree/workshop2018>) > We then tried using casperfpga libraries from ska-sa github (master > <https://github.com/ska-sa/casperfpga>), but got the same errors. > *which casperfpga should we be using?* > > For the tutorials, you should definitely be using the casperfpga linked by casper-astro/tutorials_devel which is [should be] the version we used at the workshop. Note that this is currently commit 658d312 <https://github.com/casper-astro/casperfpga/tree/658d312e96bfe5ce05699c7290a569e64800da35>, not the tip of the master branch. If this doesn't work for some reason, we should fix the submodule reference. > We also tried compiling the given snap_tut_spec.slx but still get the same > errors when adc.init() is invoked. > > Right now, we cannot isolate the problem. We are not sure whether it's > coming from the Linux PC, the RPi or the snap board running > snap_tut_spec.fpg. But the errors indicate some sort of *katcp problem > when reading/writing to adc chips*. > Some questions which may help figure out what's going on -- What length of cable have you connected the RPi to the SNAP with? For a Pi3, A cable as short as possible is probably a good idea. I don't think this is your problem, because you can program the board fine. How are you powering your SNAP -- what is the current limit? Once the 10MHz reference synthesizer is configured, the power consumption of the board will rapidly increase as the ADC/FPGA start clocking. I'm not sure how much power the spectrometer tutorial uses, but it's probably between 1.5 and 2A @ 12V. After a crash, can you immediately reconnect to the Pi? (i.e., is something so catastrophic happening that the Pi is rebooting?) Does the "adc16_controller" register show up when you do a manual listdev using casperfpga? I think it should because I can see it in the fpg file. Can you manually read this register ok? The fact that you get further in the initialization procedure when you have a legitimate 10MHz reference is encouraging. That suggests to me that at least the clock is probably getting configured OK. Cheers Jack > Any suggestions will be great! > > HARDWARE: > > - SNAP ver2.1.1 > - Raspberry Pi 3 model B > - Laptop > > SOFTWARE: > > - Ubuntu 16.04 xenial 64bit > - Raspberry Pi 3 image from > > https://casper.ssl.berkeley.edu/wiki/SNAP_Bringup#Configuring_a_SNAP_Raspberry_Pi > - https://github.com/casper-astro/tutorials_devel/tree/workshop2018 > - https://github.com/casper-astro/casperfpga (commit* ee9c43f*) > - also tried https://github.com/ska-sa/casperfpga (commit * 284a4ba*) > > ERROR MESSAGES: > > brad (workshop2018 *) tut_spec $ python snap_tut_spec.py '192.168.0.2' -b > snap_tut_spec.fpg > Connecting to server 192.168.0.2 on port 7147... ok > > ------------------------ > Programming FPGA with snap_tut_spec.fpg... done > Attempting to initialize ADC chips... > attempt number 0 *<-- added print statement to script here* > Traceback (most recent call last): > File "snap_tut_spec.py", line 109, in <module> > if adc.init(samplingRate=800, numChannel=1, resolution=8) == 0: > File "build/bdist.linux-x86_64/egg/casperfpga/snapadc.py", line 139, in > init > File "build/bdist.linux-x86_64/egg/casperfpga/adc.py", line 147, in init > File "build/bdist.linux-x86_64/egg/casperfpga/adc.py", line 398, in reset > File "build/bdist.linux-x86_64/egg/casperfpga/adc.py", line 180, in write > File "build/bdist.linux-x86_64/egg/casperfpga/adc.py", line 173, in > _wordCtrl > File "build/bdist.linux-x86_64/egg/casperfpga/adc.py", line 163, in > _bitCtrl > File "build/bdist.linux-x86_64/egg/casperfpga/wishbonedevice.py", line > 8, in _write > File "build/bdist.linux-x86_64/egg/casperfpga/casperfpga.py", line 404, > in write_int > File "build/bdist.linux-x86_64/egg/casperfpga/casperfpga.py", line 151, > in blindwrite > File "build/bdist.linux-x86_64/egg/casperfpga/transport_katcp.py", line > 290, in blindwrite > File "build/bdist.linux-x86_64/egg/casperfpga/transport_katcp.py", line > 175, in katcprequest > casperfpga.transport_katcp.KatcpRequestFail: Request write on host > 192.168.0.2 failed. > Request: ?write adc16_controller 0 \0\0 > Reply: !write fail > Request\_write\_timed\_out\_after\_10.005977\_seconds. > > > *Running script without clock source* > > brad (workshop2018 *) tut_spec $ python snap_tut_spec.py '192.168.0.2' -b > snap_tut_spec.fpg > Connecting to server 192.168.0.2 on port 7147... ok > > ------------------------ > Programming FPGA with snap_tut_spec.fpg... done > Attempting to initialize ADC chips... > attempt number 0 > ERROR:root:LMX2581 not locked > attempt number 1 > ERROR:root:LMX2581 not locked > attempt number 2 > ERROR:root:LMX2581 not locked > done (took 3 attempts) > Failed to calibrate after 3 attempts > Traceback (most recent call last): > File "snap_tut_spec.py", line 115, in <module> > exit_clean() > NameError: name 'exit_clean' is not defined > > -- > You received this message because you are subscribed to the Google Groups " > casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. 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