diff options
| -rw-r--r-- | libmaple/usart.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libmaple/usart.h b/libmaple/usart.h index 593fb8f..cbc7bde 100644 --- a/libmaple/usart.h +++ b/libmaple/usart.h @@ -76,11 +76,11 @@ extern struct usart_dev usart_dev_table[]; static inline void usart_putc(uint8 usart_num, uint8 byte) { usart_port *port = usart_dev_table[usart_num].base; - port->DR = byte; - - /* Wait for transmission to complete */ + /* Wait for the buffer to empty */ while ((port->SR & USART_TXE) == 0) ; + + port->DR = byte; } /** |