1 files changed, 4 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index a44356e..7d24dc8 100644
--- a/Makefile
+++ b/Makefile
@@ -10,2 +10,6 @@ DPIN=-DPIN=\"$(PIN)\"
 endif
+
+ifdef MASTER_PIN
+DPIN+=-DMASTER_PIN=\"$(MASTER_PIN)\"
+endif
 ACFLAGS=-g -mmcu=$(MCU) $(CFLAGS) $(DPIN) -Os -mcall-prologues