Fix button tutorial for 18-ev3dev kernel changes

dlech · dlech · commit d31df473c81f · 2017-01-25T23:54:04.000-06:00
diff --git a/docs/tutorials/using-ev3-buttons.md b/docs/tutorials/using-ev3-buttons.md
@@ -51,7 +51,7 @@ Here is an example using python:
     
     def test_bit(bit, bytes):
         # bit in bytes is 1 when released and 0 when pressed
-        return not bool(bytes[bit / 8] & (1 << (bit % 8)))
+        return bool(bytes[bit / 8] & (1 << (bit % 8)))
     
     def main():
         buf = array.array('B', [0] * BUF_LEN)
@@ -87,29 +87,29 @@ to end.
     root@ev3dev:~# hexdump -e \
     '"timestamp:%d.%6d""\t""" 1/2 "type:%i""\t"""  1/2 "code:%3i""\t"""  "value:%d\n"' \
     < /dev/input/by-path/platform-gpio-keys.0-event 
-    timestamp:1391366282.119886 type:1  code: 14    value:0
+    timestamp:1391366282.119886 type:1  code: 14    value:1
     timestamp:1391366282.120100 type:0  code:  0    value:0
-    timestamp:1391366282.829942 type:1  code: 14    value:1
+    timestamp:1391366282.829942 type:1  code: 14    value:0
     timestamp:1391366282.830179 type:0  code:  0    value:0
-    timestamp:1391366284.300099 type:1  code:105    value:0
+    timestamp:1391366284.300099 type:1  code:105    value:1
     timestamp:1391366284.300319 type:0  code:  0    value:0
-    timestamp:1391366284.829989 type:1  code:105    value:1
+    timestamp:1391366284.829989 type:1  code:105    value:0
     timestamp:1391366284.830223 type:0  code:  0    value:0
-    timestamp:1391366286.019866 type:1  code:103    value:0
+    timestamp:1391366286.019866 type:1  code:103    value:1
     timestamp:1391366286.020076 type:0  code:  0    value:0
-    timestamp:1391366286.319967 type:1  code:103    value:1
+    timestamp:1391366286.319967 type:1  code:103    value:0
     timestamp:1391366286.320202 type:0  code:  0    value:0
-    timestamp:1391366287.169925 type:1  code:106    value:0
+    timestamp:1391366287.169925 type:1  code:106    value:1
     timestamp:1391366287.169973 type:0  code:  0    value:0
-    timestamp:1391366287.479994 type:1  code:106    value:1
+    timestamp:1391366287.479994 type:1  code:106    value:0
     timestamp:1391366287.480234 type:0  code:  0    value:0
-    timestamp:1391366288.339882 type:1  code: 28    value:0
+    timestamp:1391366288.339882 type:1  code: 28    value:1
     timestamp:1391366288.340092 type:0  code:  0    value:0
-    timestamp:1391366288.699929 type:1  code: 28    value:1
+    timestamp:1391366288.699929 type:1  code: 28    value:0
     timestamp:1391366288.700291 type:0  code:  0    value:0
-    timestamp:1391366289.470046 type:1  code:108    value:0
+    timestamp:1391366289.470046 type:1  code:108    value:1
     timestamp:1391366289.470263 type:0  code:  0    value:0
-    timestamp:1391366289.829943 type:1  code:108    value:1
+    timestamp:1391366289.829943 type:1  code:108    value:0
     timestamp:1391366289.830176 type:0  code:  0    value:0
     ^C
 
