1 files changed, 4 insertions, 0 deletions
diff --git a/spi.h b/spi.h
index ed6129a..86149f7 100644
--- a/spi.h
+++ b/spi.h
@@ -16,4 +16,8 @@ inline void ioe_spi_expose(int8_t data);
 // Following function must be user defined
 inline void ioe_spi_retrieve(int8_t);
 
+#if !(__MCU_ATmega328p__ || __MCU_ATmega32U4p__)
+#error "SPI is not probably supported by your hardware."
+#endif
+
 #endif /* _IOE_SPI_H_ */