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bin conversion function

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This commit is contained in:
jand 2003-02-05 22:38:06 +00:00
parent 19d63957d1
commit a79822c570
2 changed files with 17 additions and 6 deletions
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10
doc/informal.tex
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@ -245,7 +245,7 @@ def bin2gray(width, B, G):
width -- bit width width -- bit width
B -- input intbv signal, binary encoded B -- input intbv signal, binary encoded
G -- output intbv signal, gray encoded G -- output intbv signal, Gray encoded
""" """
while 1: while 1:
yield B yield B
@ -254,10 +254,10 @@ def bin2gray(width, B, G):
\end{verbatim} \end{verbatim}
This code introduces a few new concepts. The string in triple This code introduces a few new concepts. The string in triple quotes
quotes at the start of the function is a \dfn{doc string}. This is at the start of the function is a \dfn{doc string}. This is standard
standard Python practice to document function and other Python practice for the structured documentation of code. Moreover, we
code. Also, we use a third form of the \keyword{yield} statement: use a third form of the \keyword{yield} statement:
\samp{yield \var{signal}}. This specifies that the generator should \samp{yield \var{signal}}. This specifies that the generator should
resume whenever \var{signal} changes value. This is typically used to resume whenever \var{signal} changes value. This is typically used to
describe combinatorial logic. describe combinatorial logic.

13
myhdl/intbv.py
View File

@ -26,7 +26,13 @@ __date__ = "$Date$"
import sys import sys
maxint = sys.maxint maxint = sys.maxint
from types import StringType from types import StringType
def _int2bitstring(num):
if num == 0:
return "0"
if num == 1:
return "1"
return _int2bitstring(num // 2) + _int2bitstring(num % 2)
class intbv(object): class intbv(object):
__slots__ = ('_val', '_len') __slots__ = ('_val', '_len')
@ -73,6 +79,11 @@ class intbv(object):
res._len = basewidth + width res._len = basewidth + width
return res return res
# conversion to binary string
def bin(self):
return _int2bitstring(self._val)
# copy methods # copy methods
def __copy__(self): def __copy__(self):
return intbv(self._val) return intbv(self._val)