D_source: case sensitive file system

Schematic Simulation (Ngspice)
1

How can I use d_source with a case sensitive file system (Ubuntu)?

* model D_Imp

.subckt Imp  p1
.control
setcs f = "/home/dunkelwind/Dokumente/Projekte/NE544/NE544/NE544Simu/imp.stim"
echo $f
.endc
a_1 [ p1 ] input_vec1
.model input_vec1 d_source(input_file ="/home/dunkelwind/Dokumente/Projekte/NE544/NE544/NE544Simu/imp.stim")
.ends
2

I can use d_source only with lower-case path’s ??? :grimacing:

3

I think that you need to cd to the folder in the control section first and then the d_source file can be relative not absolute. It will have to be a lower case file name though.

Here’s how I did it with d_process Mixed mode simulation including C code and verilog

4

Thanks for the hint, it’s works :grinning:
But imho, it’s a nightmare that ngspice not support linux case sensitive file names.

5

What filesystem is the file on?
Linux programs have to go out of their way to be case insentive and honesty I havnt met one that is.
The case sentivity comes.from the filesystem and that is why NTFS/FAT mounts end up being case insentive.

Likewise ext4 does have options these days to be case insentive

–edit–
Yes it’s ngspice

All identifiers are case insensitive - the identifier ‘npn’ is equivalent to ‘NPN’ and to ‘nPn

This might be due to SPICE

6

I have pushed a fix to ngspice git development branch pre-master-43. It will be available in ngspice-43.

Indeed Spice traditionally has been case insensitive. With file paths and names this does not make sense though, as file handling in Linux (and macOS) is case sensitive…

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