From 3dbdd153040087f23d63204b142f355936ae8bc0 Mon Sep 17 00:00:00 2001
From: Nic Aitch <nic@nicinabox.com>
Date: Mon, 6 Feb 2017 19:57:34 -0600
Subject: Check for a new serial port every second

---
 keyboards/lets_split/rules.mk | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/keyboards/lets_split/rules.mk b/keyboards/lets_split/rules.mk
index 0dc5491302..0efa785505 100644
--- a/keyboards/lets_split/rules.mk
+++ b/keyboards/lets_split/rules.mk
@@ -76,10 +76,12 @@ CUSTOM_MATRIX = yes
 
 avrdude: build
 	ls /dev/tty* > /tmp/1; \
-	echo "Reset your Pro Micro then hit any key to continue..."; \
-	read -n 1 -s; \
-	ls /dev/tty* > /tmp/2; \
-	USB=`diff /tmp/1 /tmp/2 | grep '>' | sed -e 's/> //'`; \
+	echo "Reset your Pro Micro now"; \
+	while [[ -z $$USB ]]; do \
+	  sleep 1; \
+	  ls /dev/tty* > /tmp/2; \
+	  USB=`diff /tmp/1 /tmp/2 | grep -o '/dev/tty.*'`; \
+	done; \
 	avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex
 
 .PHONY: avrdude
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