pyvcdr

this is a python library for vcd wave file read.

install:

pip install pyvcdr

or just copy pyvcdr.py file to your project.

readfile:

    import pyvcdr
    a = pyvcdr.VcdR()
    a.read_file('./test1.vcd')

read from str:

    import pyvcdr
    a = pyvcdr.VcdR()
    a.parse_str('$var wire 1 ! D0 $end\n#0 0!\n')

use the data:

after read. their are two ways to access the data. first is access data by signal:

    print(a.signals[0])#Signal(wire, 1, !, D0)
    print(a.signals[1])#Signal(wire, 1, ", D1)
    print(a.signals[2])#Signal(wire, 1, #, D2)
    print(a.signals[1].module)#D1
    for i in a.signals[1].steps:
        print(i)
        #(0, '1') time, val
        #(1250, '0')
        #(6250, '1')
        #。。。

second is access data by time:

    for i in a.time_values:
        print('time:', i[0], '. sig:', i[1], '. val:', i[2])
        #(0, 'D0', '0')
        #(0, 'D1', '1')
        #(0, 'D2', '1')
        #(1250, 'D1', '0')
        #(6250, 'D1', '1')
        #(10000, 'D1', '0')
        #(15000, 'D1', '1')
        #...

why I write this code:

I need a python vcd file read program.

I used this library first: https://github.com/westerndigitalcorporation/pyvcd but it could not read file. just write is supported.

then this one: https://github.com/em-/python-vcd/tree/master/vcd it works, but is very very slow.

info and thanks:

• the class Signal is from pyvcd library.
• import error fix and pep8 sytle fix by @EtlamGit

any issues：

I just write it for my file read. so it may not fit some IEEE 1364-2005 protocol. if it do not work for you, add an issue on github: https://github.com/Jiangshan00001/pyvcdr

post the file that could not work. or you can also change the code yourself.

CHANGE:

• V0.9 2022.7.10 fix issue when no newline char. thanks to: @AcksID
• V0.8 2021.10.9 add parse_str function.
• V0.7 2021.5.9 BUG FIX: import error fix and pep8 sytle fix. thanks t: @EtlamGit.
• V0.6 2021.5.8. add suport for bBrR data support.