diff --git a/Makefile-common b/Makefile-common
index e7be5eb..19efb5e 100644
--- a/Makefile-common
+++ b/Makefile-common
@@ -124,6 +124,9 @@ regressiontests:
 	# Generic RAMPS configuration.
 	$(MAKE) -f Makefile-AVR USER_CONFIG=testcases/config.regtest-ramps.h \
 	  MCU=atmega2560 F_CPU=16000000UL EXTRA_CFLAGS=-Werror all
+	# Nanoheart configuration for ATmega328, I2C and display SSD1306 support.
+	$(MAKE) -f Makefile-AVR USER_CONFIG=testcases/config.regtest-nanoheart.h \
+	  MCU=atmega328 F_CPU=16000000UL EXTRA_CFLAGS=-Werror all
 	# Generic Teensy2 configuration, which uses USB_SERIAL and no SD card.
 	$(MAKE) -f Makefile-AVR USER_CONFIG=testcases/config.regtest-teensy2.h \
 	  MCU=atmega32u4 F_CPU=16000000UL EXTRA_CFLAGS=-Werror all
diff --git a/config/board.nanoheart-v1.0.h b/config/board.nanoheart-v1.0.h
index 85e5cf5..dcb70a3 100644
--- a/config/board.nanoheart-v1.0.h
+++ b/config/board.nanoheart-v1.0.h
@@ -50,8 +50,8 @@
 
 #define X_STEP_PIN               DIO2
 #define X_DIR_PIN                DIO4
-//#define X_MIN_PIN                AIO2
-#define X_MAX_PIN                AIO2
+#define X_MIN_PIN                AIO2
+//#define X_MAX_PIN                AIO2
 #define X_ENABLE_PIN             AIO0
 //#define X_INVERT_DIR
 //#define X_INVERT_MIN
@@ -60,8 +60,8 @@
 
 #define Y_STEP_PIN               DIO5
 #define Y_DIR_PIN                DIO6
-//#define Y_MIN_PIN                AIO3
-#define Y_MAX_PIN                AIO3
+#define Y_MIN_PIN                AIO3
+//#define Y_MAX_PIN                AIO3
 #define Y_ENABLE_PIN             AIO0
 //#define Y_INVERT_DIR
 //#define Y_INVERT_MIN
diff --git a/testcases/config.regtest-nanoheart.h b/testcases/config.regtest-nanoheart.h
new file mode 100644
index 0000000..9f9bfe8
--- /dev/null
+++ b/testcases/config.regtest-nanoheart.h
@@ -0,0 +1,6 @@
+
+// Configuration for controller board.
+#include "../config/board.nanoheart-v1.0.h"
+
+// Configuration for printer board.
+#include "../config/printer.mendel.h"