From 4ca8fa21a33e7b769b261a883e5e9f7735f1e758 Mon Sep 17 00:00:00 2001
From: svchao <shan_cando@163.com>
Date: Fri, 17 Dec 2021 18:25:56 +0800
Subject: [PATCH] [drivers] add the serial port data bit length to 9.

---
 components/drivers/serial/serial.c      | 6 ++++++
 components/libc/termios/posix_termios.h | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index 76298ea153..b7d51bbdd7 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -25,6 +25,7 @@
  * 2020-09-14     WillianChan  add a line feed to the carriage return character
  *                             when using interrupt tx
  * 2020-12-14     Meco Man     add function of setting window's size(TIOCSWINSZ)
+ * 2021-12-17     svchao       add support for MCU with a data bit length of 9.
  */
 
 #include <rthw.h>
@@ -1044,6 +1045,8 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
                     tio->c_cflag = CS7;
                 else if (serial->config.data_bits == DATA_BITS_8)
                     tio->c_cflag = CS8;
+                else if (serial->config.data_bits == DATA_BITS_9)
+                    tio->c_cflag = CS9;
 
                 if (serial->config.stop_bits == STOP_BITS_2)
                     tio->c_cflag |= CSTOPB;
@@ -1083,6 +1086,9 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
                 case CS7:
                     config.data_bits = DATA_BITS_7;
                     break;
+                case CS9:
+                    config.data_bits = DATA_BITS_9;
+                    break;
                 default:
                     config.data_bits = DATA_BITS_8;
                     break;
diff --git a/components/libc/termios/posix_termios.h b/components/libc/termios/posix_termios.h
index 6dc5531955..ac05de0734 100644
--- a/components/libc/termios/posix_termios.h
+++ b/components/libc/termios/posix_termios.h
@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2017/08/30     Bernard      The first version
+ * 2021-12-17     svchao       add the definition of CS9
  */
 #ifndef TERMIOS_H__
 #define TERMIOS_H__
@@ -133,11 +134,12 @@ struct termios {
 #define B3500000 0010016
 #define B4000000 0010017
 
-#define CSIZE  0000060
+#define CSIZE  0000070
 #define CS5    0000000
 #define CS6    0000020
 #define CS7    0000040
 #define CS8    0000060
+#define CS9    0000010
 #define CSTOPB 0000100
 #define CREAD  0000200
 #define PARENB 0000400
-- 
Gitee