Really fix $MONITOR_PORT detection

Fixes issue #215

2 files changed, 7 insertions, 2 deletions

diff --git a/Arduino.mk b/Arduino.mk
index 3735b08..183f633 100644
--- a/Arduino.mk
+++ b/Arduino.mk
@@ -866,6 +866,7 @@ LDFLAGS       += -$(MCU_FLAG_NAME)=$(MCU) -Wl,--gc-sections -O$(OPTIMIZATION_LEV
 SIZEFLAGS     ?= --mcu=$(MCU) -C
 
 # for backwards compatibility, grab ARDUINO_PORT if the user has it set
+# instead of MONITOR_PORT
 MONITOR_PORT ?= $(ARDUINO_PORT)
 
 ifeq ($(CURRENT_OS), WINDOWS)
@@ -879,12 +880,16 @@ ifeq ($(CURRENT_OS), WINDOWS)
     DEVICE_PATH = /dev/ttyS$(shell awk 'BEGIN{ print $(COM_PORT_ID) - 1 }')
 endif
 
-ifdef MONITOR_PORT
+ifneq ($(strip $(MONITOR_PORT)),)
+    # set DEVICE_PATH based on user-defined MONITOR_PORT or ARDUINO_PORT
     DEVICE_PATH = $(MONITOR_PORT)
+    $(call show_config_variable,DEVICE_PATH,[COMPUTED],(from MONITOR_PORT))
 else
     # If no port is specified, try to guess it from wildcards.
+    # Will only work if the Arduino is the only/first device matched.
     DEVICE_PATH = $(firstword $(wildcard \
 			/dev/ttyACM? /dev/ttyUSB? /dev/tty.usbserial* /dev/tty.usbmodem*))
+    $(call show_config_variable,DEVICE_PATH,[AUTODETECTED])
 endif
 
 # Returns the Arduino port (first wildcard expansion) if it exists, otherwise it errors.
diff --git a/HISTORY.md b/HISTORY.md
index bf97bdf..a720f47 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -13,7 +13,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 - Fix: Add missing newlines at end of some echo's (Issue #207) (https://github.com/sej7278)
 - Fix: Add missing/reorder/reword targets in `make help` (https://github.com/sej7278)
 - New: Arduino.mk is now compatible with Flymake mode (https://github.com/rbarzic)
-- Fix: MONITOR_PORT detection (Issue #213) (https://github.com/sej7278)
+- Fix: MONITOR_PORT detection (Issue #213, #215) (https://github.com/sej7278)
 
 ### 1.3.3 (2014-04-12)
 - Fix: Make a new manpage for ard-reset-arduino. Fixes issue #188 (https://github.com/sej7278)