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| author | Michael Hope <michaelh@juju.net.nz> | 2010-10-20 21:06:17 +1300 |
|---|---|---|
| committer | Michael Hope <michaelh@juju.net.nz> | 2010-10-20 21:06:17 +1300 |
| commit | d38ffc1c658476a5c28e3d70ac9abd300f914433 (patch) | |
| tree | fb71a34b29fd2d0ba1cae826bc844227fe463ca7 /libmaple | |
| parent | 5b856438167d2f60ceeb295b70bd788874808031 (diff) | |
| download | librambutan-d38ffc1c658476a5c28e3d70ac9abd300f914433.tar.gz librambutan-d38ffc1c658476a5c28e3d70ac9abd300f914433.zip | |
Wait until the transmit buffer is empty before send to save time
Diffstat (limited to 'libmaple')
| -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; } /** |