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-rw-r--r--serial_link/system/system.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/serial_link/system/system.h b/serial_link/system/system.h
index c798e64774..163349953d 100644
--- a/serial_link/system/system.h
+++ b/serial_link/system/system.h
@@ -26,11 +26,11 @@ SOFTWARE.
#define SERIAL_LINK_SYSTEM_H
void serial_link_lock() {
-
}
void serial_link_unlock() {
-
}
+void signal_data_written(void);
+
#endif