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-rw-r--r--03-refactor/include/usart.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/03-refactor/include/usart.h b/03-refactor/include/usart.h
index 3fea253..377048c 100644
--- a/03-refactor/include/usart.h
+++ b/03-refactor/include/usart.h
@@ -207,5 +207,7 @@ void usart_transmit_bytes(
void usart_transmit_str(__IO usart_t* usart, const char* str);
+void usart_printf(__IO usart_t* usart, const char* fmt, ...);
+
#endif /* H__USART_ */