diff --git a/include/termios.h b/include/termios.h
index e4be03f3db6..5032a6b9aec 100644
--- a/include/termios.h
+++ b/include/termios.h
@@ -303,6 +303,12 @@ int cfsetspeed(FAR struct termios *termiosp, speed_t speed);
 #define cfsetispeed(termiosp,speed) cfsetspeed(termiosp,speed)
 #define cfsetospeed(termiosp,speed) cfsetspeed(termiosp,speed)
 
+/* The cfmakeraw() function is a non-POSIX function that sets the terminal
+ * to something like the "raw" mode.
+ */
+
+void cfmakeraw(FAR struct termios *termiosp);
+
 /* Wait for transmission of output */
 
 int tcdrain(int fd);
diff --git a/libs/libc/termios/Make.defs b/libs/libc/termios/Make.defs
index 18eeb803bb4..3d211b3a127 100644
--- a/libs/libc/termios/Make.defs
+++ b/libs/libc/termios/Make.defs
@@ -41,7 +41,7 @@ ifeq ($(CONFIG_SERIAL_TERMIOS),y)
 
 # Add the termios C files to the build
 
-CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_isatty.c lib_tcflush.c
+CSRCS += lib_cfgetspeed.c lib_cfsetspeed.c lib_cfmakeraw.c lib_isatty.c lib_tcflush.c
 CSRCS += lib_tcflow.c lib_tcgetattr.c lib_tcsetattr.c
 
 # Add the termios directory to the build
diff --git a/libs/libc/termios/lib_cfmakeraw.c b/libs/libc/termios/lib_cfmakeraw.c
new file mode 100644
index 00000000000..e1d82d05308
--- /dev/null
+++ b/libs/libc/termios/lib_cfmakeraw.c
@@ -0,0 +1,70 @@
+/****************************************************************************
+ * libs/libc/termios/lib_cfmakeraw.c
+ *
+ *   Copyright 2018 Sony Video & Sound Products Inc.
+ *   Author: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <termios.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: cfgetspeed
+ *
+ * Description:
+ *   The cfmakeraw() function is a non-POSIX function that sets the terminal
+ *   to something like the "raw" mode.
+ *
+ * Input Parameters:
+ *   termiosp - The termiosp argument is a pointer to a termios structure.
+ *
+ * Returned Value:
+ *
+ ****************************************************************************/
+
+void cfmakeraw(FAR struct termios *termiosp)
+{
+  DEBUGASSERT(termiosp);
+  termiosp->c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
+                         | INLCR | IGNCR | ICRNL | IXON);
+  termiosp->c_oflag &= ~OPOST;
+  termiosp->c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+  termiosp->c_cflag &= ~(CSIZE | PARENB);
+  termiosp->c_cflag |= CS8;
+}