X-Git-Url: https://git.stderr.nl/gitweb?a=blobdiff_plain;f=Adders.hs;h=748c06fdb73e50158297e887b07939cb57d3865e;hb=c9b67e6b9c131a3e73bee4cdb4c4d37479e7bf36;hp=c49ba810ce1ae4768ac2bd7efd673d1c198a0a28;hpb=d49dfd213e2cd384bceb38dc70eb122711d4f996;p=matthijs%2Fmaster-project%2Fc%CE%BBash.git

diff --git a/Adders.hs b/Adders.hs
index c49ba81..748c06f 100644
--- a/Adders.hs
+++ b/Adders.hs
@@ -1,4 +1,4 @@
-module Adders (main, no_carry_adder) where
+module Adders where
 import Bits
 import Language.Haskell.Syntax
 
@@ -10,12 +10,22 @@ show_add f = do print ("Sum:   " ++ (displaysigs s)); print ("Carry: " ++ (displ
     b = [Low, Low, Low, High]
     (s, c) = f (a, b)
 
--- Combinatoric no-carry adder
+-- Not really an adder, but this is nice minimal hardware description
+wire :: Bit -> Bit
+wire a = a
+
+-- Combinatoric stateless no-carry adder
 -- A -> B -> S
 no_carry_adder :: (Bit, Bit) -> Bit
 no_carry_adder (a, b) = a `hwxor` b
 
--- Combinatoric (one-bit) full adder
+-- Combinatoric stateless half adder
+-- A -> B -> (S, C)
+half_adder :: (Bit, Bit) -> (Bit, Bit)
+half_adder (a, b) = 
+  ( a `hwxor` b, a `hwand` b )
+
+-- Combinatoric stateless full adder
 -- (A, B, C) -> (S, C)
 full_adder :: (Bit, Bit, Bit) -> (Bit, Bit)
 full_adder (a, b, cin) = (s, c)