add variable COMPORT

ChangeLog

@@ -122,6 +122,7 @@
             Changed 6x8 builtin font to a modified Dina_r400-6 supporting non-ASCII characters
             Bangle.js: Modify E.showMessage/Prompt/Alert to clear the entire screen and redraw widgets (fix #1771)
             Bangle.js: Modify Bangle.drawWidgets to only clear the areas where widgets actually are, not the whole top&bottom bar
+            ESP32: add environment variable COMPORT to be used with make flash 
 
      2v04 : Allow \1..\9 escape codes in RegExp
             ESP8266: reading storage is not working for boot from user2 (fix #1507)

make/targets/ESP32.make

@@ -25,10 +25,13 @@ $(ESP_ZIP): $(PROJ_NAME).bin
 
 proj: $(PROJ_NAME).bin $(ESP_ZIP)
 
-flash:
+flash: $(PROJ_NAME).bin
+ifndef COMPORT
+	$(error "In order to flash, we need to have the COMPORT variable defined")
+endif
 	python $(ESP_IDF_PATH)/components/esptool_py/esptool/esptool.py \
 	--chip esp32 \
-	--port "/dev/ttyUSB0" \
+	--port ${COMPORT} \
 	--baud 921600 \
 	write_flash \
 	-z \
@@ -39,8 +42,11 @@ flash:
 	0x8000 $(ESP_APP_TEMPLATE_PATH)/build/partitions_espruino.bin
 
 erase_flash:
+ifndef COMPORT
+	$(error "In order to flash, we need to have the COMPORT variable defined")
+endif
 	python $(ESP_IDF_PATH)/components/esptool_py/esptool/esptool.py \
 	--chip esp32 \
-	--port "/dev/ttyUSB0" \
+	--port ${COMPORT}\
 	--baud 921600 \
 	erase_flash