From 361810dca80b31b2ba236df8fdea48b89fedfd4d Mon Sep 17 00:00:00 2001
From: Danny Nguyen <danny@keeb.io>
Date: Thu, 25 Jan 2018 16:36:01 -0500
Subject: [PATCH] Only search through newly detected devices and discard ones
 that disappeared

---
 tmk_core/avr.mk | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index 24722736ee9..e11ba2e23e7 100644
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -175,10 +175,11 @@ avrdude: $(BUILD_DIR)/$(TARGET).hex check-size
 		ls /dev/tty* > /tmp/1; \
 		echo -e "Detecting USB port, reset your controller now.\c"; \
 		while [ -z $$USB ]; do \
-			sleep 1; \
 			echo -e ".\c"; \
+			sleep 0.5; \
 			ls /dev/tty* > /tmp/2; \
-			USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
+			USB=`comm -13 /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
+			mv /tmp/2 /tmp/1; \
 		done; \
 		echo ""; \
 		echo "Detected controller on USB port at $$USB"; \