Sleep until USB port becomes writable before running avrdude (#5393)

[qmk_firmware.git] / tmk_core / avr.mk

diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index d22c3bbcadeff7785730e25d278622409477c6f1..79fdf4de537160cd898deffc22d8f16c70dfad2a 100644 (file)
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -214,12 +214,15 @@ define EXEC_AVRDUDE
                        mv /tmp/2 /tmp/1; \
                done; \
                echo ""; \
-               echo "Detected controller on USB port at $$USB"; \
+               echo "Device $$USB has appeared; assuming it is the controller."; \
                if $(GREP) -q -s 'MINGW\|MSYS' /proc/version; then \
                        USB=`echo "$$USB" | perl -pne 's/\/dev\/ttyS(\d+)/COM.($$1+1)/e'`; \
                        echo "Remapped MSYS2 USB port to $$USB"; \
+                       sleep 1; \
+               else \
+                       printf "Waiting for $$USB to become writable."; \
+                       while [ ! -w "$$USB" ]; do sleep 0.5; printf "."; done; echo ""; \
                fi; \
-               sleep 1; \
                avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex; \
        fi
 endef