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-rw-r--r--platforms/avr/_wait.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/platforms/avr/_wait.h b/platforms/avr/_wait.h
index 39cbf618d2..54f578ace0 100644
--- a/platforms/avr/_wait.h
+++ b/platforms/avr/_wait.h
@@ -21,6 +21,8 @@
#include <util/delay.h>
#pragma GCC diagnostic pop
+extern void __builtin_avr_delay_cycles(uint32_t);
+
// http://ww1.microchip.com/downloads/en/devicedoc/atmel-0856-avr-instruction-set-manual.pdf
// page 22: Table 4-2. Arithmetic and Logic Instructions
/*