Add avrdude split EE_HANDS flash commands (#5414)

* Add EEPROM avrdude flashing commands for setting handedness

* Update docs with info on flashing EEPROM handedness files with commands

1 files changed, 12 insertions, 2 deletions

diff --git a/tmk_core/avr.mk b/tmk_core/avr.mk
index 79fdf4de5..bf3e269fd 100644
--- a/tmk_core/avr.mk
+++ b/tmk_core/avr.mk
@@ -223,7 +223,11 @@ define EXEC_AVRDUDE
                         printf "Waiting for $$USB to become writable."; \
                         while [ ! -w "$$USB" ]; do sleep 0.5; printf "."; done; echo ""; \
                 fi; \
-                avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex; \
+                if [ -z "$(1)" ]; then \
+                        avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex; \
+                else \
+                        avrdude -p $(MCU) -c avr109 -P $$USB -U flash:w:$(BUILD_DIR)/$(TARGET).hex -U eeprom:w:$(QUANTUM_PATH)/split_common/$(1); \
+                fi \
         fi
 endef
 
@@ -232,9 +236,15 @@ avrdude: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
 
 avrdude-loop: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
         while true; do \
-            $(call EXEC_AVRDUDE) ; \
+                $(call EXEC_AVRDUDE) ; \
         done
 
+avrdude-split-left: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
+        $(call EXEC_AVRDUDE,eeprom-lefthand.eep)
+
+avrdude-split-right: $(BUILD_DIR)/$(TARGET).hex check-size cpfirmware
+        $(call EXEC_AVRDUDE,eeprom-righthand.eep)
+
 # Convert hex to bin.
 bin: $(BUILD_DIR)/$(TARGET).hex
         $(OBJCOPY) -Iihex -Obinary $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin