Make DFU wait for bootloader

Added a loop for waiting for the keyboard to be put in bootloader mode,
rather than failing out. Makes building keymaps easier.

diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index 3bf2b34f88f8a00c840244ce925812e79c596740..6c03e1650e80e6e747f0f8755830092d982a0f54 100644 (file)
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -107,6 +107,10 @@ flip: $(BUILD_DIR)/$(TARGET).hex
        batchisp -hardware usb -device $(MCU) -operation start reset 0
 
 dfu: $(BUILD_DIR)/$(TARGET).hex sizeafter
+       until dfu-programmer $(MCU) get bootloader-version; do\
+               echo "Error: Bootloader not found. Trying again in 5s." ;\
+               sleep 5 ;\
+       done
 ifneq (, $(findstring 0.7, $(shell dfu-programmer --version 2>&1)))
        dfu-programmer $(MCU) erase --force
 else