Add support for extended BAUD settings

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4967 7fd9a85b-ad96-42d3-883c-3090e2eb8679
2026-10-17 14:13:33 +08:00 · 2012-07-22 17:01:25 +00:00
parent 200e62a958
commit 81d5f42a18
8 changed files with 512 additions and 58 deletions
@@ -0,0 +1,100 @@
+/****************************************************************************
+ * include/sys/str_tty.h
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_SYS_STR_TTY_H
+#define __INCLUDE_SYS_STR_TTY_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdint.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/* These are non-standard AIX-like interfaces to simplify TTY baud rate
+ * operations.
+ *
+ * The baud rate functions set_speed() and get_speed() are provided to
+ * allow the applications to program any value of the baud rate that is
+ * supported by the serial driver, but that cannot be expressed using
+ * the termios subroutines cfsetospeed, cfsetispeed, cfgetospeed,
+ * and cfsgetispeed. Those subroutines are limited to the set of values
+ * defined termios.h.
+ *
+ * Normal mode: This is the default mode, in which a termios supported
+ * speed is in use.
+ *
+ * Speed-extended mode: This mode is entered by calling set_speed() with
+ * a non-termios supported speed at the configuration of the line. In this
+ * mode, all the calls to tcgetattr subroutine or TCGETS ioctl subroutine
+ * will have B50 in the returned termios structure.
+ *
+ * If tcsetattr() or TCSETS, TCSETAF, or TCSETAW ioctl calls the driver
+ * and attempts to set B50, the actual baud rate is not changed. If it
+ * attempts to set any other termios-supported speed, will switch back
+ * to the normal mode and the requested baud rate is set.  Calling
+ * reset_speed subroutine is another way to switch back to the
+ * normal mode.
+ */
+
+EXTERN int32_t get_speed(int fd);
+EXTERN int set_speed(int fd, int32_t speed);
+EXTERN int reset_speed(int fd);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __INCLUDE_SYS_STR_TTY_H */