From aa30d0db52a500123e7884044a9b21698394ffeb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Fri, 29 Jan 2016 11:07:02 +0100
Subject: [PATCH] can flash using DFU even if sofware reset is not possible

---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 610987b..3f3890e 100644
--- a/Makefile
+++ b/Makefile
@@ -104,6 +104,7 @@ OOCD_TARGET ?= stm32f1x
 
 # which USB CDC ACM port is used bu the device, so we can reset it
 ACMPORT = /dev/ttyACM0
+ACMPORT_EXISTS = $(shell [ -e $(ACMPORT) ] && echo 1 || echo 0 )
 
 # board specific USB DFU bootloader
 BOOTLOADERS = STM32duino-bootloader
@@ -172,8 +173,10 @@ flash-swd: $(BINARY).hex
 
 # reset device by setting the data width to 5 bis on the USB CDC ACM port
 reset:
+ifeq ($(ACMPORT_EXISTS), 1)
 	$(Q)stty --file $(ACMPORT) 115200 raw cs5
 	$(Q)sleep 0.5
+endif
 	
 flash-dfu: $(BINARY).bin reset
 	$(info flashing $(<) using DFU)