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-rw-r--r--examples/baremetal/cc2540usbdongle/greenblink/system.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/examples/baremetal/cc2540usbdongle/greenblink/system.h b/examples/baremetal/cc2540usbdongle/greenblink/system.h
index cdc6302d4..4f105dbd0 100644
--- a/examples/baremetal/cc2540usbdongle/greenblink/system.h
+++ b/examples/baremetal/cc2540usbdongle/greenblink/system.h
@@ -66,6 +66,9 @@ extern "C" {
#elif defined (__SDCC_mcs51)
#include <mcs51/compiler.h>
# define DEFINE_SFR(name, addr) __sfr __at(addr) name;
+# ifndef NOP
+# define NOP() __asm NOP __endasm
+# endif
# define system_nop() NOP()
#else
#error "Unsupported toolchain"