From 7c2ece0331e0cd9dad9f738698c1d58d04558858 Mon Sep 17 00:00:00 2001
From: Florian Jung <flo@windfisch.org>
Date: Sun, 24 Jan 2016 16:06:58 +0100
Subject: tut

---
 avr/1wire.c                           |  18 +++++---
 avr/main.c                            |   5 ++-
 pc/__pycache__/analyze.cpython-34.pyc | Bin 0 -> 4154 bytes
 pc/analyze.py                         |  80 ++++++++++++++++++++++++++++++++++
 4 files changed, 95 insertions(+), 8 deletions(-)
 create mode 100644 pc/__pycache__/analyze.cpython-34.pyc
 create mode 100644 pc/analyze.py

diff --git a/avr/1wire.c b/avr/1wire.c
index 5dbca82..affd80d 100644
--- a/avr/1wire.c
+++ b/avr/1wire.c
@@ -79,15 +79,20 @@ uint8_t w1_bit_io( uint8_t b )
 	_delay_us( 1 );
 	if( b )
 	{
-		//hard_vcc;
-		//asm volatile("nop" ::: );
+		hard_vcc;
+		_delay_us(7 );
 		soft_vcc;
+		_delay_us( 15 - 1 - 7 );
+	}
+	else
+	{
+		_delay_us( 15 - 1 );
 	}
-	_delay_us( 15 - 1 );
 	if( (W1_IN & (1<<W1_PIN)) == 0 )
 		b = 0;
 	_delay_us( 60 - 15 );
-	soft_vcc;
+	//soft_vcc;
+	hard_vcc;
 	sei();
 	return b;
 }
@@ -104,6 +109,7 @@ uint8_t w1_byte_wr( uint8_t b )
 			b |= 0x80;
 	}
 	while( --i );
+	soft_vcc;
 	return b;
 }
 
@@ -113,7 +119,7 @@ uint8_t w1_byte_rd( void )
 	return w1_byte_wr( 0xFF );
 }
 
-
+/*
 uint8_t w1_rom_search( uint8_t diff, uint8_t *id )
 {
 	uint8_t i, j, next_diff;
@@ -158,7 +164,7 @@ uint8_t w1_rom_search( uint8_t diff, uint8_t *id )
 	}
 	while( i );
 	return next_diff;				// to continue search
-}
+}*/
 
 void ds1992_read(uint16_t addr, uint8_t* buf, uint8_t len)
 {
diff --git a/avr/main.c b/avr/main.c
index 5c9742f..e1a4099 100644
--- a/avr/main.c
+++ b/avr/main.c
@@ -72,7 +72,8 @@ usbMsgLen_t usbFunctionSetup(uchar data[8])
 		case FUNC_WRITE:
 			PORTC ^= LED_RED;
 			//strcpy(replyBuffer, "Hello world");
-			len = strlen(replyBuffer)+1;
+			//len = strlen(replyBuffer)+1;
+			len = 130;
 			break;
 	}
 
@@ -159,7 +160,7 @@ int main(void)
 			if (result == 0)
 			{
 				PORTC &= ~LED_GREEN;
-				ds1992_read(0x00, replyBuffer, 128);
+				ds1992_read(42, replyBuffer, 128);
 			}
 			else if (result == 1)
 				PORTC &= ~LED_RED;
diff --git a/pc/__pycache__/analyze.cpython-34.pyc b/pc/__pycache__/analyze.cpython-34.pyc
new file mode 100644
index 0000000..6980785
Binary files /dev/null and b/pc/__pycache__/analyze.cpython-34.pyc differ
diff --git a/pc/analyze.py b/pc/analyze.py
new file mode 100644
index 0000000..f3bb31b
--- /dev/null
+++ b/pc/analyze.py
@@ -0,0 +1,80 @@
+import re
+from collections import defaultdict
+
+class Dumps:
+    def __init__(self):
+        self.dumps = []
+
+    def load(self, f):
+        dump = []
+        tag = None
+        no = 0
+        for line in open(f,"r").readlines():
+            if re.match("[0-9A-Z]{2}( [0-9A-Z]{2}){25} *$", line):
+                # this is a line of a hexdump
+                dump += [int(s,16) for s in line.split()]
+            else:
+                if len(dump):
+                    self.dumps += [(no,tag,dump)]
+                    dump = []
+                    tag = None
+                    no+=1
+
+                if line.strip() != "":
+                    if tag != None:
+                        print("overriding tag %s with %s"%(tag,line))
+
+                    tag = line.replace("\n","")
+                # else ignore
+
+    def show(self,xcols,xrows):
+        if xcols == None: xcols = []
+        if xrows == None: xrows = []
+
+        for n, tag, dump in self.filter(xcols,xrows):
+            for byte in dump:
+                print("%02X "%byte, end="") # TODO
+            print(tag)
+
+
+    def filter(self,xcols,xrows):
+        return [ (dump[0], dump[1], [byte for byte,pos in zip(dump[2],range(len(dump[2]))) if pos not in xcols ]) for dump in self.dumps if dump[0] not in xrows]
+
+def mirror(dumps):
+    n = len(dumps)
+    m = len(dumps[0][2])
+    result = [[None]*n for i in range(m)]
+    for i in range(n):
+        for j in range(m):
+            result[j][i] = dumps[i][2][j]
+    return result
+
+def stats(cols):
+    ncols = len(cols)
+
+    result = [defaultdict(lambda : 0) for i in range(ncols)]
+    for col,stat in zip(cols,result):
+        for a,b in zip(col,col[1:]):
+            stat[(b-a)%256]+=1./(len(col)-1)
+    return result
+
+def getconstcols(stats):
+    return [col for stat,col in zip(stats,range(len(stats))) if stat[0]>0.9999]
+
+def showstats(stats):
+    for stat,pos in zip(stats,range(len(stats))):
+        print("%i:\t%s"%(pos,str(dict(stat))))
+
+def prettydict(d):
+    for k,v in sorted(d.items(), key=lambda a:-a[1]):
+        print("%02X: %2.0f | "%(k,100*v),end="")
+    print("")
+
+d = Dumps()
+d.load("mydump.txt")
+
+cc = getconstcols(stats(mirror(d.filter([],[]))))
+d.show(cc,[])
+
+for i in stats(mirror(d.filter(cc,[]))):
+    prettydict(i)
-- 
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