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-rw-r--r--sw/lib/SPI.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sw/lib/SPI.h b/sw/lib/SPI.h
index 5206a09..eac4c35 100644
--- a/sw/lib/SPI.h
+++ b/sw/lib/SPI.h
@@ -14,6 +14,8 @@
#ifndef _SPI_H_INCLUDED
#define _SPI_H_INCLUDED
+#error "do not use"
+
#include <Arduino.h>
// SPI_HAS_TRANSACTION means SPI has beginTransaction(), endTransaction(),