Hi,
I’m having an issue with the casperfpga tool.
When I try to upload my .fpg file to my red pitaya using the
upload_to_ram_and_program function, it returns “true”. However the program does
not appear run, when looking at the LED’s and looking at the digital ports and
analog ports with an oscilloscope. I have tried using the .fpg tutorial files
and got the same result:
In [1]: import casperfpga
In [2]: fpga = casperfpga.CasperFpga('rp-f0ea58.local')
In [3]:
fpga.upload_to_ram_and_program('/home/casper/Downloads/tut_adc_dac_2019-07-16_1041.fpg')
Out[3]: True
In [4]: fpga.test_connection()
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
Cell In[4], line 1
----> 1 fpga.test_connection()
File
~/work/cfpga_venv/lib/python3.8/site-packages/casperfpga/casperfpga.py:434, in
CasperFpga.test_connection(self)
430 def test_connection(self):
431 """
432 Write to and read from the scratchpad to test the connection to the
FPGA
433 """
--> 434 return self.transport.test_connection()
File
~/work/cfpga_venv/lib/python3.8/site-packages/casperfpga/transport_katcp.py:382,
in KatcpTransport.test_connection(self)
380 val2 = struct.unpack('>L', val2[0:4])[0]
381 if val != val2:
--> 382 raise RuntimeError('%s: cannot write scratchpad? %i != %i' %
383 (self.host, val, val2))
384 return True
RuntimeError: rp-f0ea58.local: cannot write scratchpad? 10855845 != 0
When I try to upload my design via the red pitaya recommended path
(https://redpitaya-knowledge-base.readthedocs.io/en/latest/learn_fpga/3_vivado_env/tutorfpga2.html)
it works without a problem. I am then even able to communicate with the red
pitaya from my casperfpga, indicating that the problem lies with the
upload_to_ram_and_program function:
In [7]:
fpga.upload_to_ram_and_program('CASPER_repos/test_red_pitaya_adc_dac/outputs/test_red_pitaya_adc_dac_2025-11-18_1405.fpg')
Out[7]: True
In [8]: fpga.test_connection()
Out[8]: True
In [9]: fpga.write_int('counter_ctrl1',100000)
I hope you can help me with this issue.
Thanks in advance for your time.
Kind regards,
Flint Wardenaar BSc
Electronics engineer
Pronouns: he/him
[cid:[email protected]]
Leiden University | Faculty of Science - ELD | +31 643793301 |
www.universiteitleiden.nl/en<https://www.universiteitleiden.nl/en>
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