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Python bindings for ngspice simulation engine

Home Page: https://ignamv.github.io/ngspyce

License: GNU General Public License v2.0

Python 100.00%

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ngspyce's Issues

Issue with alterparams

I am trying to change a parameter inside my netlist by doing this:

ngspyce.source('../../simulation/tb_nfet1v8_params.spice')
w=3e-6
l=0.150e-6
ngspyce.alterparams(channel_width=w, channel_length=l)

Here is my netlist (I am working with the sky130 open PDK):

** sch_path: /foss/designs/efabless-opencore/xschem/param/tb_nfet1v8_params.sch
**.subckt tb_nfet1v8_params
Vgs vg GND 1
Vds vd GND 1
XM1 vd vg GND GND sky130_fd_pr__nfet_01v8 L=channel_length W=channel_width nf=1 ad='int((nf+1)/2) * W/nf * 0.29'
+ as='int((nf+2)/2) * W/nf * 0.29' pd='2*int((nf+1)/2) * (W/nf + 0.29)' ps='2*int((nf+2)/2) * (W/nf + 0.29)'
+ nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 mult=1 m=1
**** begin user architecture code

.param mc_mm_switch=0
.param mc_pr_switch=0
.include /foss/pdk/sky130A/libs.tech/ngspice/corners/tt.spice
.include /foss/pdk/sky130A/libs.tech/ngspice/r+c/res_typical__cap_typical.spice
.include /foss/pdk/sky130A/libs.tech/ngspice/r+c/res_typical__cap_typical__lin.spice
.include /foss/pdk/sky130A/libs.tech/ngspice/corners/tt/specialized_cells.spice

.param channel_width=3
.param channel_length=0.15

**** end user architecture code
**.ends
.GLOBAL GND
.end

But the interpreter is giving me this (not always):

bash-4.4# python nfet_gm.py
ERROR:ngspyce.sharedspice:Error: No internal deck available
ERROR:ngspyce.sharedspice:Command 'alterparam' ignored

After running this command the program eventually segfaults during the simulations.

Is this an issue with the library? If not, maybe you could include some examples of correct usage?

Add a doc for ngspyce ?

Hi, thanks for sharing ngspyce.

I plan to use it for circuit simulation with netlist generated by kicad. Can you set up a document dir ?

and, how could I help in improving this project ?

ngspyce using ngspice.dll under windows ?

Hi,

I compile a windows x64 based ngspice.dll for ngspyce and modify line 12 of ngspyce.py as:

spice = CDLL('ngspice.dll')

I placed all ngspice binaries and ngspice.dll in D:/Tools/spice/bin, and set up the PATH environment of windows as D:\Tools\spice\bin. ngspyce can be loaded and it can find the dll!

In order to find spinit file for ngspice, I set SPICE_SCRIPTS of windows to D:\Tools\spice\share\ngspice\scripts, and modify spinit as

* For SPICE2 POLYs, edit the below line to point to the location 
* of your codemodel.

 codemodel D:/Tools/Spice/lib/ngspice/spice2poly.cm

* The other codemodels
 codemodel d:/Tools/Spice/lib/ngspice/analog.cm
 codemodel d:/Tools/Spice/lib/ngspice/digital.cm
 codemodel d:/Tools/Spice/lib/ngspice/xtradev.cm
 codemodel d:/Tools/Spice/lib/ngspice/xtraevt.cm

all the examples, lowpass_filter.py and npn.py work fine ! But it keeps complaining

ERROR:ngspice:Error: Library D:/Tools/Spice/lib/ngspice/spice2poly.cm couldn't be loaded!
ERROR:ngspice:Error: Library d:/Tools/Spice/lib/ngspice/analog.cm couldn't be loaded!
ERROR:ngspice:Error: Library d:/Tools/Spice/lib/ngspice/digital.cm couldn't be loaded!
ERROR:ngspice:Error: Library d:/Tools/Spice/lib/ngspice/xtradev.cm couldn't be loaded!
ERROR:ngspice:Error: Library d:/Tools/Spice/lib/ngspice/xtraevt.cm couldn't be loaded!

the quad.py failed because spice2poly.cm can not be loaded.

Can we solve it and enable ngspyce for windows ?

BTW: when simulating quad.py, ngspice seems to be much slower than LTSpice.

Memory increases forever

If I do hundreds of simulations (experimenting with circuit optimization) the memory usage just increases forever.

after 0:

['Total elapsed time: 3.081 seconds.',
 'Total DRAM available = 8072.601563 MB.',
 'DRAM currently available = 5075.894531 MB.',
 'Total ngspice program size = 2.312500 MB.']

after 1000:

['Total elapsed time: 75.566 seconds.',
 'Total DRAM available = 8072.601563 MB.',
 'DRAM currently available = 3778.500000 MB.',
 'Total ngspice program size = 1320.335938 MB.']

after thousands:

['Total elapsed time: 2419.410 seconds.',
 'Total DRAM available = 8072.601563 MB.',
 'DRAM currently available = 425.308594 MB.',
 'Total ngspice program size = 2960.398438 MB.']

I'm calling ngspyce.destroy() after each simulation, but it's still increasing continually.

I can't find any way to clear the memory except to completely restart python

Manual says

The simulation result remains in memory until the libspice library is unloaded (typically:
when the tcl script ends) or when a spice::clean command is performed.

But I don't know what spice::clean means.

I can't call ngspyce.initalize() to clear it, it gives an exception:

OSError: exception: access violation writing 0x0000000180610CE0

I tried remcirc, reset, save none but none of them clear memory. quit results in a stack overflow.

CKTdestroy supposedly does it, but I don't know how to call that.

>>> import sys
>>> sys.modules[__name__].__dict__.clear()

does not clear memory but breaks lots of other things

from importlib import reload
reload(ngspyce)

doesn't clear memory

Went through the trouble of learning how to make a DLL unload() function and that doesn't clear memory either:

def unload():
    kernel32 = ctypes.WinDLL('kernel32')
    kernel32.FreeLibrary.argtypes = [ctypes.wintypes.HMODULE]

    handle = spice._handle # obtain the DLL handle
    kernel32.FreeLibrary(handle)

libngspice.so: cannot open shared object file: No such file or directory

Hey,

can't start the ngspyce,

the error message is here:

  File "/home/borisov/Desktop/sht/ngspyce-master/examples/npn/npn.py", line 5, in <module>
    import ngspyce
  File "/home/borisov/anaconda2/envs/py3/lib/python3.6/site-packages/ngspyce-0.1-py3.6.egg/ngspyce/__init__.py", line 2, in <module>
    from .ngspyce import *
  File "/home/borisov/anaconda2/envs/py3/lib/python3.6/site-packages/ngspyce-0.1-py3.6.egg/ngspyce/ngspyce.py", line 63, in <module>
    spice = CDLL('libngspice.so')
  File "/home/borisov/anaconda2/envs/py3/lib/python3.6/ctypes/__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: libngspice.so: cannot open shared object file: No such file or directory

I'm using python2.7 and python3.6 on Ubuntu 16.10

Best,
Vadim

Error when running example/quad.py

the error message says

ERROR:ngspice:Error: Could not find include file lm324.model
ERROR:ngspice:Error: there aren't any circuits loaded.
ERROR:ngspice:Error: vector time not found!
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
/home/postgres/py/ngspyce/examples/quadrature_oscillator/quad.py in <module>()
     11 
     12 # Read results
---> 13 time, vsin, vcos = map(ngspyce.vector, ['time','Vsin','Vcos'])
     14 # And plot them
     15 plt.plot(time*1e3, vcos, label='Vcos')

/home/postgres/py/ngspyce/ngspyce/ngspyce.py in vector(name)
    208     vec = spice.ngGet_Vec_Info(name.encode('ascii'))
    209     if not vec:
--> 210         raise RuntimeError('Vector {} not found'.format(name))
    211     vec = vec[0]
    212     if vec.v_length == 0:

RuntimeError: Vector time not found

I am using python-2.7 python-3.5 with ngspice 26-3

unable to find libngspice

On debian ngspyce is unable to find the ngspice library.

I had to make some slight modifications to the ngspice source to get it to compile (warnings treated as errors)
But after the usual ./configure --with-shared && make && sudo makeinstall dance the ngspice library lives in

/usr/local/lib/ngspice.so.0

However since find_library('ngspice') returns ngspice.so.0
CDLL(find_library('ngspice')) fails with:

OSError: libngspice.so.0: cannot open shared object file: No such file or directory

CDLL('/usr/local/lib/'+find_library('ngspice')) on the other hand finds the lib but fails for another reason:
OSError: /usr/local/lib/libngspice.so.0: undefined symbol: wantevtdata

power dissipation and storage inside the resistor and inductor

Hello,

i am looking forward the implementation in derive's "power dissipation R and storage L/C" for long time. There are some trick such as referring "ngspice-28-manual.pdf" chapter 31. Unfortunately, it is not work after many trials. Hereby, could please kindly comment this as possible.

thanks

jasper

Update documention for obtaining DLL

I haven't used ngspyce in a while, but the latest two releases of ngspice have separate ngspice-28_64.zip and ngspice-28_dll_64.zip files, which contain executables and dll, respectively.

So the documentation I added in https://github.com/ignamv/ngspyce#getting-libngspice needs to be updated. I'm not sure where the recommended DLL installation path is now, and not sure how ngspyce should find the DLL, either.

PDF says "After compilation the executable, code models and initialization files are available in directory
C: as C:\Spice, C:\Spice64 etc." but not the DLL

I know very little about Windows development, but maybe the DLL should be registered so that ngspyce can find it regardless of physical location? Is that how that works? Or maybe it should be included with ngspyce?

ignamv / ngspyce Goto Github PK

ngspyce's People

Contributors

Stargazers

Watchers

Forkers

ngspyce's Issues

Issue with alterparams

Add a doc for ngspyce ?

ngspyce using ngspice.dll under windows ?

Memory increases forever

libngspice.so: cannot open shared object file: No such file or directory

Error when running example/quad.py

unable to find libngspice

power dissipation and storage inside the resistor and inductor

Update documention for obtaining DLL

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