Move the main ATMega328P sketch into a sub-directory and add the Leonardo sketch to a sub-directory from the branch. Helps folks that download the repository via ZIP file and will allow different board support that is not easily done via ifdef checks.

logic_analyzer_leonardo/Makefile

@@ -0,0 +1,24 @@
+#
+# Makefile for an Arduino based logic analyzer using the arduino-cli
+#
+
+TARGET	= logic_analyzer_leonardo
+FQBN	= arduino:avr:leonardo
+SERIAL	= /dev/ttyUSB*
+
+
+all:
+	@echo ""
+	@echo "---> run 'make build' to compile for Arduino Leonardo"
+	@echo "---> run 'make upload' to upload to /dev/ttyUSB*"
+	@echo ""
+
+build:
+	arduino-cli compile --fqbn $(FQBN) $(TARGET)
+
+upload:
+	arduino-cli upload --fqbn $(FQBN) --port $(SERIAL) $(TARGET)
+
+#
+# end-of-file
+#