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-rw-r--r--firmware/system.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/firmware/system.h b/firmware/system.h
index 9b1df03217..fdc472f5e2 100644
--- a/firmware/system.h
+++ b/firmware/system.h
@@ -25,6 +25,18 @@
#define FREQ 12000000 /* cycle time ~83.3ns */
#define BAUDRATE 9600
+#ifndef NULL
+#define NULL ((void*)0)
+#endif
+
+#ifndef MIN
+#define MIN(a, b) (((a)<(b))?(a):(b))
+#endif
+
+#ifndef MAX
+#define MAX(a, b) MIN(b,a)
+#endif
+
#ifdef LITTLE_ENDIAN
#define SWAB16(x) (x)
#define SWAB32(x) (x)