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-rw-r--r--digital/io-hub/src/apbirthday/robot.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/digital/io-hub/src/apbirthday/robot.cc b/digital/io-hub/src/apbirthday/robot.cc
index fa654e98..727976c8 100644
--- a/digital/io-hub/src/apbirthday/robot.cc
+++ b/digital/io-hub/src/apbirthday/robot.cc
@@ -234,7 +234,7 @@ Robot::proto_handle (ucoo::Proto &proto, char cmd, const uint8_t *args, int size
// Demo mode.
// 1B: 'f for follow mode.
// 1B: 00 for clockwise, 01 for anti-clockwise
- top_demo_follow (args[0] == 1 ? 1 : -1);
+ top_demo_follow (args[1] == 1 ? 1 : -1);
break;
case c ('m', 5):
// Go to position.