From 90fea785c6aa60fdfd398fee262bb06c69a010b7 Mon Sep 17 00:00:00 2001
From: hathach <thach@tinyusb.org>
Date: Wed, 29 May 2019 16:56:26 +0700
Subject: use adafruit-nrfutil dfu as default flash target for feather nrf52840

---
 examples/make.mk | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'examples')

diff --git a/examples/make.mk b/examples/make.mk
index 73e339d84..6706294ad 100644
--- a/examples/make.mk
+++ b/examples/make.mk
@@ -14,6 +14,13 @@ CP = cp
 RM = rm
 PYTHON ?= python
 
+check_defined = \
+    $(strip $(foreach 1,$1, \
+    $(call __check_defined,$1,$(strip $(value 2)))))
+__check_defined = \
+    $(if $(value $1),, \
+    $(error Undefined make flag: $1$(if $2, ($2))))
+
 # Select the board to build for.
 ifeq ($(BOARD),)
   $(info You must provide a BOARD parameter with 'BOARD=')
-- 
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