1 files changed, 4 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index a44356e..7d24dc8 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,10 @@ CFLAGS=-Wall -Wextra -Wno-unused-parameter -pedantic -std=c99
 ifdef PIN
 DPIN=-DPIN=\"$(PIN)\"
 endif
+
+ifdef MASTER_PIN
+DPIN+=-DMASTER_PIN=\"$(MASTER_PIN)\"
+endif
 ACFLAGS=-g -mmcu=$(MCU) $(CFLAGS) $(DPIN) -Os -mcall-prologues
 # ALDFLAGS=-L/usr/avr/lib/avr4 -L/usr/lib/binutils/avr/2.18
 LD=gcc