From e5acff0312ec74ce6ced2a3f357a25ec8ff5d4db Mon Sep 17 00:00:00 2001
From: tmk <hasu@tmk-kbd.com>
Date: Thu, 8 Sep 2016 13:52:59 +0900
Subject: [PATCH] core: 'make dfu' waits for bootloader to start

jackhumbert/qmk_firmware@0b8c448
---
 tmk_core/rules.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tmk_core/rules.mk b/tmk_core/rules.mk
index 0ae84d91..a0a7c3e5 100644
--- a/tmk_core/rules.mk
+++ b/tmk_core/rules.mk
@@ -420,6 +420,10 @@ flip: $(TARGET).hex
 	batchisp -hardware usb -device $(MCU) -operation start reset 0
 
 dfu: $(TARGET).hex
+	@until dfu-programmer atmega32u4 get bootloader-version > /dev/null 2>&1; do \
+		echo  -n "."; \
+		sleep 1; \
+	done
 ifneq (, $(findstring 0.7, $(shell dfu-programmer --version 2>&1)))
 	dfu-programmer $(MCU) erase --force
 else
-- 
2.39.3