litex/litescope/host/dump/vcd.py

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import datetime
from litescope.host.dump import *
class VCDDump(Dump):
def __init__(self, init_dump=None, timescale="1ps", comment=""):
Dump.__init__(self)
if init_dump:
self.vars = init_dump.vars
self.timescale = timescale
self.comment = comment
self.cnt = -1
def change(self):
r = ""
c = ""
for var in self.vars:
c += var.change(self.cnt)
if c != "":
r += "#"
r += str(self.cnt+1)
r += "\n"
r += c
return r
def generate_date(self):
now = datetime.datetime.now()
r = "$date\n"
r += "\t"
r += now.strftime("%Y-%m-%d %H:%M")
r += "\n"
r += "$end\n"
return r
def generate_version(self):
r = "$version\n"
r += "\tmiscope VCD dump\n"
r += "$end\n"
return r
def generate_comment(self):
r = "$comment\n"
r += self.comment
r += "\n$end\n"
return r
def generate_timescale(self):
r = "$timescale "
r += self.timescale
r += " $end\n"
return r
def generate_scope(self):
r = "$scope "
r += self.timescale
r += " $end\n"
return r
def generate_vars(self):
r = ""
for var in self.vars:
r += "$var "
r += var.type
r += " "
r += str(var.width)
r += " "
r += var.vcd_id
r += " "
r += var.name
r += " $end\n"
return r
def generate_unscope(self):
r = "$unscope "
r += " $end\n"
return r
def generate_enddefinitions(self):
r = "$enddefinitions "
r += " $end\n"
return r
def generate_dumpvars(self):
r = "$dumpvars\n"
for var in self.vars:
r += "b"
r += dec2bin(var.val, var.width)
r += " "
r += var.vcd_id
r+= "\n"
r += "$end\n"
return r
def generate_valuechange(self):
r = ""
for i in range(len(self)):
r += self.change()
self.cnt += 1
return r
def __repr__(self):
r = ""
return r
def write(self, filename):
f = open(filename, "w")
f.write(self.generate_date())
f.write(self.generate_comment())
f.write(self.generate_timescale())
f.write(self.generate_scope())
f.write(self.generate_vars())
f.write(self.generate_unscope())
f.write(self.generate_enddefinitions())
f.write(self.generate_dumpvars())
f.write(self.generate_valuechange())
f.close()
def read(self, filename):
raise NotImplementedError("VCD files can not (yet) be read, please contribute!")
if __name__ == '__main__':
dump = VCDDump()
dump.add(Var("foo1", 1, [0,1,0,1,0,1]))
dump.add(Var("foo2", 2, [1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0]))
ramp = [i%128 for i in range(1024)]
dump.add(Var("ramp", 16, ramp))
dump.write("dump.vcd")