added RS-232 Library, also covered by the GPL

9 files changed, 2699 insertions, 0 deletions

diff --git a/RS-232/LICENSE b/RS-232/LICENSE
new file mode 100644
index 0000000..e43d6cf
--- /dev/null
+++ b/RS-232/LICENSE
@@ -0,0 +1,677 @@
+
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+
diff --git a/RS-232/Makefile b/RS-232/Makefile
new file mode 100755
index 0000000..6af5201
--- /dev/null
+++ b/RS-232/Makefile
@@ -0,0 +1,42 @@
+#
+#
+# Author: Teunis van Beelen
+#
+# email: teuniz@gmail.com
+#
+#
+
+CC = gcc
+CFLAGS = -Wall -Wextra -Wshadow -Wformat-nonliteral -Wformat-security -Wtype-limits -o2
+
+objects = rs232.o
+
+all: test_rx test_tx
+
+test_rx : $(objects) demo_rx.o
+	$(CC) $(objects) demo_rx.o -o test_rx
+
+test_tx : $(objects) demo_tx.o
+	$(CC) $(objects) demo_tx.o -o test_tx
+
+demo_rx.o : demo_rx.c rs232.h
+	$(CC) $(CFLAGS) -c demo_rx.c -o demo_rx.o
+
+demo_tx.o : demo_tx.c rs232.h
+	$(CC) $(CFLAGS) -c demo_tx.c -o demo_tx.o
+
+rs232.o : rs232.h rs232.c
+	$(CC) $(CFLAGS) -c rs232.c -o rs232.o
+
+clean :
+	$(RM) test_rx test_tx $(objects) demo_rx.o demo_tx.o rs232.o
+
+#
+#
+#
+#
+
+
+
+
+
diff --git a/RS-232/demo_rx.c b/RS-232/demo_rx.c
new file mode 100644
index 0000000..94bd8c3
--- /dev/null
+++ b/RS-232/demo_rx.c
@@ -0,0 +1,72 @@
+
+/**************************************************
+
+file: demo_rx.c
+purpose: simple demo that receives characters from
+the serial port and print them on the screen,
+exit the program by pressing Ctrl-C
+
+compile with the command: gcc demo_rx.c rs232.c -Wall -Wextra -o2 -o test_rx
+
+**************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <unistd.h>
+#endif
+
+#include "rs232.h"
+
+
+
+int main()
+{
+  int i, n,
+      cport_nr=0,        /* /dev/ttyS0 (COM1 on windows) */
+      bdrate=9600;       /* 9600 baud */
+
+  unsigned char buf[4096];
+
+  char mode[]={'8','N','1',0};
+
+
+  if(RS232_OpenComport(cport_nr, bdrate, mode))
+  {
+    printf("Can not open comport\n");
+
+    return(0);
+  }
+
+  while(1)
+  {
+    n = RS232_PollComport(cport_nr, buf, 4095);
+
+    if(n > 0)
+    {
+      buf[n] = 0;   /* always put a "null" at the end of a string! */
+
+      for(i=0; i < n; i++)
+      {
+        if(buf[i] < 32)  /* replace unreadable control-codes by dots */
+        {
+          buf[i] = '.';
+        }
+      }
+
+      printf("received %i bytes: %s\n", n, (char *)buf);
+    }
+
+#ifdef _WIN32
+    Sleep(100);
+#else
+    usleep(100000);  /* sleep for 100 milliSeconds */
+#endif
+  }
+
+  return(0);
+}
+
diff --git a/RS-232/demo_tx.c b/RS-232/demo_tx.c
new file mode 100644
index 0000000..bd43fb4
--- /dev/null
+++ b/RS-232/demo_tx.c
@@ -0,0 +1,66 @@
+
+/**************************************************
+
+file: demo_tx.c
+purpose: simple demo that transmits characters to
+the serial port and print them on the screen,
+exit the program by pressing Ctrl-C
+
+compile with the command: gcc demo_tx.c rs232.c -Wall -Wextra -o2 -o test_tx
+
+**************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef _WIN32
+#include <Windows.h>
+#else
+#include <unistd.h>
+#endif
+
+#include "rs232.h"
+
+
+
+int main()
+{
+  int i=0,
+      cport_nr=0,        /* /dev/ttyS0 (COM1 on windows) */
+      bdrate=9600;       /* 9600 baud */
+
+  char mode[]={'8','N','1',0},
+       str[2][512];
+
+
+  strcpy(str[0], "The quick brown fox jumped over the lazy grey dog.\n");
+
+  strcpy(str[1], "Happy serial programming!\n");
+
+  if(RS232_OpenComport(cport_nr, bdrate, mode))
+  {
+    printf("Can not open comport\n");
+
+    return(0);
+  }
+
+  while(1)
+  {
+    RS232_cputs(cport_nr, str[i]);
+
+    printf("sent: %s\n", str[i]);
+
+#ifdef _WIN32
+    Sleep(1000);
+#else
+    usleep(1000000);  /* sleep for 1 Second */
+#endif
+
+    i++;
+
+    i %= 2;
+  }
+
+  return(0);
+}
+
diff --git a/RS-232/doc.txt b/RS-232/doc.txt
new file mode 100644
index 0000000..863ad22
--- /dev/null
+++ b/RS-232/doc.txt
@@ -0,0 +1,230 @@
+
+Library: RS-232
+Author:  Teunis van Beelen
+Url:     http://www.teuniz.net/RS-232/
+E-mail:  teuniz@gmail.com
+License: GPLv3
+
+Last revision: November 22, 2017
+
+
+
+int RS232_OpenComport(int comport_number, int baudrate, const char * mode)
+
+  Opens the comport, comportnumber starts with 0 (see the list of numbers).
+  Baudrate is expressed in baud per second i.e 115200 (see the list of possible baudrates).
+  Mode is a string in the form of "8N1", "7E2", etc.
+  8N1 means eight databits, no parity, one stopbit. If in doubt, use 8N1 (see the list of possible modes).
+  Returns 1 in case of an error.
+  In case the comport is already opened (by another process),
+  it will not open the port but raise an error instead.
+
+int RS232_PollComport(int comport_number, unsigned char *buf, int size)
+
+  Gets characters from the serial port (if any). Buf is a pointer to a buffer
+  and size the size of the buffer in bytes.
+  Returns the amount of received characters into the buffer. This can be less than size or zero!
+  It does not block or wait, it returns immediately, no matter if any characters have been received or not.
+  After succesfully opening the COM-port, connect this function to a timer.
+  The timer should have an interval of approx. 20 to 100 milliSeconds.
+  Do not forget to stop the timer before closing the COM-port.
+  Allways check the return value! The return value tells you how many bytes
+  are actually received and present in your buffer!
+
+int RS232_SendByte(int comport_number, unsigned char byte)
+
+  Sends a byte via the serial port. Returns 1 in case of an error.
+
+int RS232_SendBuf(int comport_number, unsigned char *buf, int size)
+
+  Sends multiple bytes via the serial port. Buf is a pointer to a buffer
+  and size the size of the buffer in bytes.
+  Returns -1 in case of an error, otherwise it returns the amount of bytes sent.
+  This function blocks (it returns after all the bytes have been processed).
+
+void RS232_CloseComport(int comport_number)
+
+  Closes the serial port.
+
+void RS232_cputs(int comport_number, const char *text)
+
+  Sends a string via the serial port. String must be null-terminated.
+
+int RS232_GetPortnr(const char *devname)
+
+  Returns the comport number based on the device name e.g. "ttyS0" or "COM1".
+  (Doesn't mean the device actually exists!)
+  Returns -1 when not found.
+
+
+The following functions are normally not needed but can be used to set or check the status of the control-lines:
+================================================================================================================
+
+void RS232_enableDTR(int comport_number)
+
+  Sets the DTR line high (active state).
+
+void RS232_disableDTR(int comport_number)
+
+  Sets the DTR line low (non active state).
+
+void RS232_enableRTS(int comport_number)
+
+  Sets the RTS line high (active state).
+
+void RS232_disableRTS(int comport_number)
+
+  Sets the RTS line low (non active state).
+
+int RS232_IsDSREnabled(int comport_number)
+
+  Checks the status of the DSR-pin. Returns 1 when the the DSR line is high (active state), otherwise 0.
+
+int RS232_IsCTSEnabled(int comport_number)
+
+  Checks the status of the CTS-pin. Returns 1 when the the CTS line is high (active state), otherwise 0.
+
+int RS232_IsDCDEnabled(int comport_number)
+
+  Checks the status of the DCD-pin. Returns 1 when the the DCD line is high (active state), otherwise 0.
+
+
+The following functions are normally not needed but can be used to empty the rx/tx buffers:
+===========================================================================================
+
+("discards data written to the serial port but not transmitted, or data received but not read")
+
+void RS232_flushRX(int comport_number)
+
+  Flushes data received but not read.
+
+void RS232_flushTX(int comport_number)
+
+  Flushes data written but not transmitted.
+
+void RS232_flushRXTX(int comport_number)
+
+  Flushes both data received but not read, and data written but not transmitted.
+
+
+
+Notes:
+
+You don't need to call RS232_PollComport() when you only want to send characters.
+Sending and receiving do not influence eachother.
+
+The os (kernel) has an internal buffer of 4096 bytes (for traditional onboard serial ports).
+USB/Serial-converter drivers use much bigger buffers (multiples of 4096).
+If this buffer is full and a new character arrives on the serial port,
+the oldest character in the buffer will be overwritten and thus will be lost.
+
+After a successfull call to RS232_OpenComport(), the os will start to buffer incoming characters.
+
+tip: To get access to the serial port on Linux, you need to be a member of the group "dialout".
+
+Note: Traditional (on-board) UART's usually have a speed limit of max. 115200 baud.
+            Special cards and USB to Serial converters can usually be set to higher baudrates.
+
+
+List of comport numbers, possible baudrates and modes:
+
+  Linux   windows
+0   ttyS0   COM1
+1   ttyS1   COM2
+2   ttyS2   COM3
+3   ttyS3   COM4
+4   ttyS4   COM5
+5   ttyS5   COM6
+6   ttyS6   COM7
+7   ttyS7   COM8
+8   ttyS8   COM9
+9   ttyS9   COM10
+10  ttyS10  COM11
+11  ttyS11  COM12
+12  ttyS12  COM13
+13  ttyS13  COM14
+14  ttyS14  COM15
+15  ttyS15  COM16
+16  ttyUSB0   n.a.
+17  ttyUSB1   n.a.
+18  ttyUSB2   n.a.
+19  ttyUSB3   n.a.
+20  ttyUSB4   n.a.
+21  ttyUSB5   n.a.
+22  ttyAMA0   n.a.
+23  ttyAMA1   n.a.
+24  ttyACM0   n.a.
+25  ttyACM1   n.a.
+26  rfcomm0   n.a.
+27  rfcomm1   n.a.
+28  ircomm0   n.a.
+29  ircomm1   n.a.
+  FreeBSD
+30  cuau0     n.a.
+31  cuau1     n.a.
+32  cuau2     n.a.
+33  cuau3     n.a.
+34  cuaU0     n.a.
+35  cuaU1     n.a.
+36  cuaU2     n.a.
+37  cuaU3     n.a.
+
+Linux   windows
+50  n.a.
+75  n.a.
+110   110
+134   n.a.
+150   n.a.
+200   n.a.
+300   300
+600   600
+1200  1200
+1800  n.a.
+2400  2400
+4800  4800
+9600  9600
+19200   19200
+38400   38400
+57600   57600
+115200  115200
+230400  128000
+460800  256000
+500000  500000
+576000  n.a.
+921600  n.a.
+1000000   1000000
+1152000   n.a.
+1500000   n.a.
+2000000   n.a.
+2500000   n.a.
+3000000   n.a.
+3500000   n.a.
+4000000   n.a.
+
+Mode
+8N1
+8O1
+8E1
+8N2
+8O2
+8E2
+7N1
+7O1
+7E1
+7N2
+7O2
+7E2
+6N1
+6O1
+6E1
+6N2
+6O2
+6E2
+5N1
+5O1
+5E1
+5N2
+5O2
+5E2
+
+
diff --git a/RS-232/gpl.txt b/RS-232/gpl.txt
new file mode 100644
index 0000000..e43d6cf
--- /dev/null
+++ b/RS-232/gpl.txt
@@ -0,0 +1,677 @@
+
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
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+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
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+pattern of such abuse occurs in the area of products for individuals to
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+make it effectively proprietary.  To prevent this, the GPL assures that
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
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+  "The Program" refers to any copyrightable work licensed under this
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+tells the user that there is no warranty for the work (except to the
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+for making modifications to it.  "Object code" means any non-source
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+
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+may consider it more useful to permit linking proprietary applications with
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+
diff --git a/RS-232/howto_compile.txt b/RS-232/howto_compile.txt
new file mode 100644
index 0000000..de152cb
--- /dev/null
+++ b/RS-232/howto_compile.txt
@@ -0,0 +1,28 @@
+
+Compiling the demo's can be done as follows:
+
+gcc demo_rx.c rs232.c -Wall -Wextra -o2 -o test_rx
+
+gcc demo_tx.c rs232.c -Wall -Wextra -o2 -o test_tx
+
+or use the makefile by entering "make"
+
+Run the demo by typing:
+
+./test_rx
+
+or
+
+./test_tx
+
+
+
+To include this library into your project:
+
+Put the two files rs232.h and rs232.c in your project/sourcedirectory.
+
+Write #include "rs232.h" in your sourcefiles that needs access to the library.
+
+Add the file rs232.c to your project settings (in order to get it compiled and linked with your program).
+
+
diff --git a/RS-232/rs232.c b/RS-232/rs232.c
new file mode 100644
index 0000000..31edd53
--- /dev/null
+++ b/RS-232/rs232.c
@@ -0,0 +1,820 @@
+/*
+***************************************************************************
+*
+* Author: Teunis van Beelen
+*
+* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+*
+* Email: teuniz@gmail.com
+*
+***************************************************************************
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+***************************************************************************
+*/
+
+
+/* Last revision: November 22, 2017 */
+
+/* For more info and how to use this library, visit: http://www.teuniz.net/RS-232/ */
+
+
+#include "rs232.h"
+
+
+#if defined(__linux__) || defined(__FreeBSD__)   /* Linux & FreeBSD */
+
+#define RS232_PORTNR  38
+
+
+int Cport[RS232_PORTNR],
+    error;
+
+struct termios new_port_settings,
+       old_port_settings[RS232_PORTNR];
+
+char *comports[RS232_PORTNR]={"/dev/ttyS0","/dev/ttyS1","/dev/ttyS2","/dev/ttyS3","/dev/ttyS4","/dev/ttyS5",
+                       "/dev/ttyS6","/dev/ttyS7","/dev/ttyS8","/dev/ttyS9","/dev/ttyS10","/dev/ttyS11",
+                       "/dev/ttyS12","/dev/ttyS13","/dev/ttyS14","/dev/ttyS15","/dev/ttyUSB0",
+                       "/dev/ttyUSB1","/dev/ttyUSB2","/dev/ttyUSB3","/dev/ttyUSB4","/dev/ttyUSB5",
+                       "/dev/ttyAMA0","/dev/ttyAMA1","/dev/ttyACM0","/dev/ttyACM1",
+                       "/dev/rfcomm0","/dev/rfcomm1","/dev/ircomm0","/dev/ircomm1",
+                       "/dev/cuau0","/dev/cuau1","/dev/cuau2","/dev/cuau3",
+                       "/dev/cuaU0","/dev/cuaU1","/dev/cuaU2","/dev/cuaU3"};
+
+int RS232_OpenComport(int comport_number, int baudrate, const char *mode)
+{
+  int baudr,
+      status;
+
+  if((comport_number>=RS232_PORTNR)||(comport_number<0))
+  {
+    printf("illegal comport number\n");
+    return(1);
+  }
+
+  switch(baudrate)
+  {
+    case      50 : baudr = B50;
+                   break;
+    case      75 : baudr = B75;
+                   break;
+    case     110 : baudr = B110;
+                   break;
+    case     134 : baudr = B134;
+                   break;
+    case     150 : baudr = B150;
+                   break;
+    case     200 : baudr = B200;
+                   break;
+    case     300 : baudr = B300;
+                   break;
+    case     600 : baudr = B600;
+                   break;
+    case    1200 : baudr = B1200;
+                   break;
+    case    1800 : baudr = B1800;
+                   break;
+    case    2400 : baudr = B2400;
+                   break;
+    case    4800 : baudr = B4800;
+                   break;
+    case    9600 : baudr = B9600;
+                   break;
+    case   19200 : baudr = B19200;
+                   break;
+    case   38400 : baudr = B38400;
+                   break;
+    case   57600 : baudr = B57600;
+                   break;
+    case  115200 : baudr = B115200;
+                   break;
+    case  230400 : baudr = B230400;
+                   break;
+    case  460800 : baudr = B460800;
+                   break;
+    case  500000 : baudr = B500000;
+                   break;
+    case  576000 : baudr = B576000;
+                   break;
+    case  921600 : baudr = B921600;
+                   break;
+    case 1000000 : baudr = B1000000;
+                   break;
+    case 1152000 : baudr = B1152000;
+                   break;
+    case 1500000 : baudr = B1500000;
+                   break;
+    case 2000000 : baudr = B2000000;
+                   break;
+    case 2500000 : baudr = B2500000;
+                   break;
+    case 3000000 : baudr = B3000000;
+                   break;
+    case 3500000 : baudr = B3500000;
+                   break;
+    case 4000000 : baudr = B4000000;
+                   break;
+    default      : printf("invalid baudrate\n");
+                   return(1);
+                   break;
+  }
+
+  int cbits=CS8,
+      cpar=0,
+      ipar=IGNPAR,
+      bstop=0;
+
+  if(strlen(mode) != 3)
+  {
+    printf("invalid mode \"%s\"\n", mode);
+    return(1);
+  }
+
+  switch(mode[0])
+  {
+    case '8': cbits = CS8;
+              break;
+    case '7': cbits = CS7;
+              break;
+    case '6': cbits = CS6;
+              break;
+    case '5': cbits = CS5;
+              break;
+    default : printf("invalid number of data-bits '%c'\n", mode[0]);
+              return(1);
+              break;
+  }
+
+  switch(mode[1])
+  {
+    case 'N':
+    case 'n': cpar = 0;
+              ipar = IGNPAR;
+              break;
+    case 'E':
+    case 'e': cpar = PARENB;
+              ipar = INPCK;
+              break;
+    case 'O':
+    case 'o': cpar = (PARENB | PARODD);
+              ipar = INPCK;
+              break;
+    default : printf("invalid parity '%c'\n", mode[1]);
+              return(1);
+              break;
+  }
+
+  switch(mode[2])
+  {
+    case '1': bstop = 0;
+              break;
+    case '2': bstop = CSTOPB;
+              break;
+    default : printf("invalid number of stop bits '%c'\n", mode[2]);
+              return(1);
+              break;
+  }
+
+/*
+http://pubs.opengroup.org/onlinepubs/7908799/xsh/termios.h.html
+
+http://man7.org/linux/man-pages/man3/termios.3.html
+*/
+
+  Cport[comport_number] = open(comports[comport_number], O_RDWR | O_NOCTTY | O_NDELAY);
+  if(Cport[comport_number]==-1)
+  {
+    perror("unable to open comport ");
+    return(1);
+  }
+
+  /* lock access so that another process can't also use the port */
+  if(flock(Cport[comport_number], LOCK_EX | LOCK_NB) != 0)
+  {
+    close(Cport[comport_number]);
+    perror("Another process has locked the comport.");
+    return(1);
+  }
+
+  error = tcgetattr(Cport[comport_number], old_port_settings + comport_number);
+  if(error==-1)
+  {
+    close(Cport[comport_number]);
+    flock(Cport[comport_number], LOCK_UN);  /* free the port so that others can use it. */
+    perror("unable to read portsettings ");
+    return(1);
+  }
+  memset(&new_port_settings, 0, sizeof(new_port_settings));  /* clear the new struct */
+
+  new_port_settings.c_cflag = cbits | cpar | bstop | CLOCAL | CREAD;
+  new_port_settings.c_iflag = ipar;
+  new_port_settings.c_oflag = 0;
+  new_port_settings.c_lflag = 0;
+  new_port_settings.c_cc[VMIN] = 0;      /* block untill n bytes are received */
+  new_port_settings.c_cc[VTIME] = 0;     /* block untill a timer expires (n * 100 mSec.) */
+
+  cfsetispeed(&new_port_settings, baudr);
+  cfsetospeed(&new_port_settings, baudr);
+
+  error = tcsetattr(Cport[comport_number], TCSANOW, &new_port_settings);
+  if(error==-1)
+  {
+    tcsetattr(Cport[comport_number], TCSANOW, old_port_settings + comport_number);
+    close(Cport[comport_number]);
+    flock(Cport[comport_number], LOCK_UN);  /* free the port so that others can use it. */
+    perror("unable to adjust portsettings ");
+    return(1);
+  }
+
+/* http://man7.org/linux/man-pages/man4/tty_ioctl.4.html */
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    tcsetattr(Cport[comport_number], TCSANOW, old_port_settings + comport_number);
+    flock(Cport[comport_number], LOCK_UN);  /* free the port so that others can use it. */
+    perror("unable to get portstatus");
+    return(1);
+  }
+
+  status |= TIOCM_DTR;    /* turn on DTR */
+  status |= TIOCM_RTS;    /* turn on RTS */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    tcsetattr(Cport[comport_number], TCSANOW, old_port_settings + comport_number);
+    flock(Cport[comport_number], LOCK_UN);  /* free the port so that others can use it. */
+    perror("unable to set portstatus");
+    return(1);
+  }
+
+  return(0);
+}
+
+
+int RS232_PollComport(int comport_number, unsigned char *buf, int size)
+{
+  int n;
+
+  n = read(Cport[comport_number], buf, size);
+
+  if(n < 0)
+  {
+    if(errno == EAGAIN)  return 0;
+  }
+
+  return(n);
+}
+
+
+int RS232_SendByte(int comport_number, unsigned char byte)
+{
+  int n = write(Cport[comport_number], &byte, 1);
+  if(n < 0)
+  {
+    if(errno == EAGAIN)
+    {
+      return 0;
+    }
+    else
+    {
+      return 1;
+    }
+  }
+
+  return(0);
+}
+
+
+int RS232_SendBuf(int comport_number, unsigned char *buf, int size)
+{
+  int n = write(Cport[comport_number], buf, size);
+  if(n < 0)
+  {
+    if(errno == EAGAIN)
+    {
+      return 0;
+    }
+    else
+    {
+      return -1;
+    }
+  }
+
+  return(n);
+}
+
+
+void RS232_CloseComport(int comport_number)
+{
+  int status;
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    perror("unable to get portstatus");
+  }
+
+  status &= ~TIOCM_DTR;    /* turn off DTR */
+  status &= ~TIOCM_RTS;    /* turn off RTS */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    perror("unable to set portstatus");
+  }
+
+  tcsetattr(Cport[comport_number], TCSANOW, old_port_settings + comport_number);
+  close(Cport[comport_number]);
+
+  flock(Cport[comport_number], LOCK_UN);  /* free the port so that others can use it. */
+}
+
+/*
+Constant  Description
+TIOCM_LE        DSR (data set ready/line enable)
+TIOCM_DTR       DTR (data terminal ready)
+TIOCM_RTS       RTS (request to send)
+TIOCM_ST        Secondary TXD (transmit)
+TIOCM_SR        Secondary RXD (receive)
+TIOCM_CTS       CTS (clear to send)
+TIOCM_CAR       DCD (data carrier detect)
+TIOCM_CD        see TIOCM_CAR
+TIOCM_RNG       RNG (ring)
+TIOCM_RI        see TIOCM_RNG
+TIOCM_DSR       DSR (data set ready)
+
+http://man7.org/linux/man-pages/man4/tty_ioctl.4.html
+*/
+
+int RS232_IsDCDEnabled(int comport_number)
+{
+  int status;
+
+  ioctl(Cport[comport_number], TIOCMGET, &status);
+
+  if(status&TIOCM_CAR) return(1);
+  else return(0);
+}
+
+
+int RS232_IsCTSEnabled(int comport_number)
+{
+  int status;
+
+  ioctl(Cport[comport_number], TIOCMGET, &status);
+
+  if(status&TIOCM_CTS) return(1);
+  else return(0);
+}
+
+
+int RS232_IsDSREnabled(int comport_number)
+{
+  int status;
+
+  ioctl(Cport[comport_number], TIOCMGET, &status);
+
+  if(status&TIOCM_DSR) return(1);
+  else return(0);
+}
+
+
+void RS232_enableDTR(int comport_number)
+{
+  int status;
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    perror("unable to get portstatus");
+  }
+
+  status |= TIOCM_DTR;    /* turn on DTR */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    perror("unable to set portstatus");
+  }
+}
+
+
+void RS232_disableDTR(int comport_number)
+{
+  int status;
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    perror("unable to get portstatus");
+  }
+
+  status &= ~TIOCM_DTR;    /* turn off DTR */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    perror("unable to set portstatus");
+  }
+}
+
+
+void RS232_enableRTS(int comport_number)
+{
+  int status;
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    perror("unable to get portstatus");
+  }
+
+  status |= TIOCM_RTS;    /* turn on RTS */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    perror("unable to set portstatus");
+  }
+}
+
+
+void RS232_disableRTS(int comport_number)
+{
+  int status;
+
+  if(ioctl(Cport[comport_number], TIOCMGET, &status) == -1)
+  {
+    perror("unable to get portstatus");
+  }
+
+  status &= ~TIOCM_RTS;    /* turn off RTS */
+
+  if(ioctl(Cport[comport_number], TIOCMSET, &status) == -1)
+  {
+    perror("unable to set portstatus");
+  }
+}
+
+
+void RS232_flushRX(int comport_number)
+{
+  tcflush(Cport[comport_number], TCIFLUSH);
+}
+
+
+void RS232_flushTX(int comport_number)
+{
+  tcflush(Cport[comport_number], TCOFLUSH);
+}
+
+
+void RS232_flushRXTX(int comport_number)
+{
+  tcflush(Cport[comport_number], TCIOFLUSH);
+}
+
+
+#else  /* windows */
+
+#define RS232_PORTNR  16
+
+HANDLE Cport[RS232_PORTNR];
+
+
+char *comports[RS232_PORTNR]={"\\\\.\\COM1",  "\\\\.\\COM2",  "\\\\.\\COM3",  "\\\\.\\COM4",
+                              "\\\\.\\COM5",  "\\\\.\\COM6",  "\\\\.\\COM7",  "\\\\.\\COM8",
+                              "\\\\.\\COM9",  "\\\\.\\COM10", "\\\\.\\COM11", "\\\\.\\COM12",
+                              "\\\\.\\COM13", "\\\\.\\COM14", "\\\\.\\COM15", "\\\\.\\COM16"};
+
+char mode_str[128];
+
+
+int RS232_OpenComport(int comport_number, int baudrate, const char *mode)
+{
+  if((comport_number>=RS232_PORTNR)||(comport_number<0))
+  {
+    printf("illegal comport number\n");
+    return(1);
+  }
+
+  switch(baudrate)
+  {
+    case     110 : strcpy(mode_str, "baud=110");
+                   break;
+    case     300 : strcpy(mode_str, "baud=300");
+                   break;
+    case     600 : strcpy(mode_str, "baud=600");
+                   break;
+    case    1200 : strcpy(mode_str, "baud=1200");
+                   break;
+    case    2400 : strcpy(mode_str, "baud=2400");
+                   break;
+    case    4800 : strcpy(mode_str, "baud=4800");
+                   break;
+    case    9600 : strcpy(mode_str, "baud=9600");
+                   break;
+    case   19200 : strcpy(mode_str, "baud=19200");
+                   break;
+    case   38400 : strcpy(mode_str, "baud=38400");
+                   break;
+    case   57600 : strcpy(mode_str, "baud=57600");
+                   break;
+    case  115200 : strcpy(mode_str, "baud=115200");
+                   break;
+    case  128000 : strcpy(mode_str, "baud=128000");
+                   break;
+    case  256000 : strcpy(mode_str, "baud=256000");
+                   break;
+    case  500000 : strcpy(mode_str, "baud=500000");
+                   break;
+    case 1000000 : strcpy(mode_str, "baud=1000000");
+                   break;
+    default      : printf("invalid baudrate\n");
+                   return(1);
+                   break;
+  }
+
+  if(strlen(mode) != 3)
+  {
+    printf("invalid mode \"%s\"\n", mode);
+    return(1);
+  }
+
+  switch(mode[0])
+  {
+    case '8': strcat(mode_str, " data=8");
+              break;
+    case '7': strcat(mode_str, " data=7");
+              break;
+    case '6': strcat(mode_str, " data=6");
+              break;
+    case '5': strcat(mode_str, " data=5");
+              break;
+    default : printf("invalid number of data-bits '%c'\n", mode[0]);
+              return(1);
+              break;
+  }
+
+  switch(mode[1])
+  {
+    case 'N':
+    case 'n': strcat(mode_str, " parity=n");
+              break;
+    case 'E':
+    case 'e': strcat(mode_str, " parity=e");
+              break;
+    case 'O':
+    case 'o': strcat(mode_str, " parity=o");
+              break;
+    default : printf("invalid parity '%c'\n", mode[1]);
+              return(1);
+              break;
+  }
+
+  switch(mode[2])
+  {
+    case '1': strcat(mode_str, " stop=1");
+              break;
+    case '2': strcat(mode_str, " stop=2");
+              break;
+    default : printf("invalid number of stop bits '%c'\n", mode[2]);
+              return(1);
+              break;
+  }
+
+  strcat(mode_str, " dtr=on rts=on");
+
+/*
+http://msdn.microsoft.com/en-us/library/windows/desktop/aa363145%28v=vs.85%29.aspx
+
+http://technet.microsoft.com/en-us/library/cc732236.aspx
+*/
+
+  Cport[comport_number] = CreateFileA(comports[comport_number],
+                      GENERIC_READ|GENERIC_WRITE,
+                      0,                          /* no share  */
+                      NULL,                       /* no security */
+                      OPEN_EXISTING,
+                      0,                          /* no threads */
+                      NULL);                      /* no templates */
+
+  if(Cport[comport_number]==INVALID_HANDLE_VALUE)
+  {
+    printf("unable to open comport\n");
+    return(1);
+  }
+
+  DCB port_settings;
+  memset(&port_settings, 0, sizeof(port_settings));  /* clear the new struct  */
+  port_settings.DCBlength = sizeof(port_settings);
+
+  if(!BuildCommDCBA(mode_str, &port_settings))
+  {
+    printf("unable to set comport dcb settings\n");
+    CloseHandle(Cport[comport_number]);
+    return(1);
+  }
+
+  if(!SetCommState(Cport[comport_number], &port_settings))
+  {
+    printf("unable to set comport cfg settings\n");
+    CloseHandle(Cport[comport_number]);
+    return(1);
+  }
+
+  COMMTIMEOUTS Cptimeouts;
+
+  Cptimeouts.ReadIntervalTimeout         = MAXDWORD;
+  Cptimeouts.ReadTotalTimeoutMultiplier  = 0;
+  Cptimeouts.ReadTotalTimeoutConstant    = 0;
+  Cptimeouts.WriteTotalTimeoutMultiplier = 0;
+  Cptimeouts.WriteTotalTimeoutConstant   = 0;
+
+  if(!SetCommTimeouts(Cport[comport_number], &Cptimeouts))
+  {
+    printf("unable to set comport time-out settings\n");
+    CloseHandle(Cport[comport_number]);
+    return(1);
+  }
+
+  return(0);
+}
+
+
+int RS232_PollComport(int comport_number, unsigned char *buf, int size)
+{
+  int n;
+
+/* added the void pointer cast, otherwise gcc will complain about */
+/* "warning: dereferencing type-punned pointer will break strict aliasing rules" */
+
+  ReadFile(Cport[comport_number], buf, size, (LPDWORD)((void *)&n), NULL);
+
+  return(n);
+}
+
+
+int RS232_SendByte(int comport_number, unsigned char byte)
+{
+  int n;
+
+  WriteFile(Cport[comport_number], &byte, 1, (LPDWORD)((void *)&n), NULL);
+
+  if(n<0)  return(1);
+
+  return(0);
+}
+
+
+int RS232_SendBuf(int comport_number, unsigned char *buf, int size)
+{
+  int n;
+
+  if(WriteFile(Cport[comport_number], buf, size, (LPDWORD)((void *)&n), NULL))
+  {
+    return(n);
+  }
+
+  return(-1);
+}
+
+
+void RS232_CloseComport(int comport_number)
+{
+  CloseHandle(Cport[comport_number]);
+}
+
+/*
+http://msdn.microsoft.com/en-us/library/windows/desktop/aa363258%28v=vs.85%29.aspx
+*/
+
+int RS232_IsDCDEnabled(int comport_number)
+{
+  int status;
+
+  GetCommModemStatus(Cport[comport_number], (LPDWORD)((void *)&status));
+
+  if(status&MS_RLSD_ON) return(1);
+  else return(0);
+}
+
+
+int RS232_IsCTSEnabled(int comport_number)
+{
+  int status;
+
+  GetCommModemStatus(Cport[comport_number], (LPDWORD)((void *)&status));
+
+  if(status&MS_CTS_ON) return(1);
+  else return(0);
+}
+
+
+int RS232_IsDSREnabled(int comport_number)
+{
+  int status;
+
+  GetCommModemStatus(Cport[comport_number], (LPDWORD)((void *)&status));
+
+  if(status&MS_DSR_ON) return(1);
+  else return(0);
+}
+
+
+void RS232_enableDTR(int comport_number)
+{
+  EscapeCommFunction(Cport[comport_number], SETDTR);
+}
+
+
+void RS232_disableDTR(int comport_number)
+{
+  EscapeCommFunction(Cport[comport_number], CLRDTR);
+}
+
+
+void RS232_enableRTS(int comport_number)
+{
+  EscapeCommFunction(Cport[comport_number], SETRTS);
+}
+
+
+void RS232_disableRTS(int comport_number)
+{
+  EscapeCommFunction(Cport[comport_number], CLRRTS);
+}
+
+/*
+https://msdn.microsoft.com/en-us/library/windows/desktop/aa363428%28v=vs.85%29.aspx
+*/
+
+void RS232_flushRX(int comport_number)
+{
+  PurgeComm(Cport[comport_number], PURGE_RXCLEAR | PURGE_RXABORT);
+}
+
+
+void RS232_flushTX(int comport_number)
+{
+  PurgeComm(Cport[comport_number], PURGE_TXCLEAR | PURGE_TXABORT);
+}
+
+
+void RS232_flushRXTX(int comport_number)
+{
+  PurgeComm(Cport[comport_number], PURGE_RXCLEAR | PURGE_RXABORT);
+  PurgeComm(Cport[comport_number], PURGE_TXCLEAR | PURGE_TXABORT);
+}
+
+
+#endif
+
+
+void RS232_cputs(int comport_number, const char *text)  /* sends a string to serial port */
+{
+  while(*text != 0)   RS232_SendByte(comport_number, *(text++));
+}
+
+
+/* return index in comports matching to device name or -1 if not found */
+int RS232_GetPortnr(const char *devname)
+{
+  int i;
+
+  char str[32];
+
+#if defined(__linux__) || defined(__FreeBSD__)   /* Linux & FreeBSD */
+  strcpy(str, "/dev/");
+#else  /* windows */
+  strcpy(str, "\\\\.\\");
+#endif
+  strncat(str, devname, 16);
+  str[31] = 0;
+
+  for(i=0; i<RS232_PORTNR; i++)
+  {
+    if(!strcmp(comports[i], str))
+    {
+      return i;
+    }
+  }
+
+  return -1;  /* device not found */
+}
+
+
+
+
+
+
+
+
+
+
+
diff --git a/RS-232/rs232.h b/RS-232/rs232.h
new file mode 100644
index 0000000..4a8bdcf
--- /dev/null
+++ b/RS-232/rs232.h
@@ -0,0 +1,87 @@
+/*
+***************************************************************************
+*
+* Author: Teunis van Beelen
+*
+* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+*
+* Email: teuniz@gmail.com
+*
+***************************************************************************
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*
+***************************************************************************
+*/
+
+/* Last revision: August 5, 2017 */
+
+/* For more info and how to use this library, visit: http://www.teuniz.net/RS-232/ */
+
+
+#ifndef rs232_INCLUDED
+#define rs232_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+
+
+#if defined(__linux__) || defined(__FreeBSD__)
+
+#include <termios.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include <sys/file.h>
+#include <errno.h>
+
+#else
+
+#include <windows.h>
+
+#endif
+
+int RS232_OpenComport(int, int, const char *);
+int RS232_PollComport(int, unsigned char *, int);
+int RS232_SendByte(int, unsigned char);
+int RS232_SendBuf(int, unsigned char *, int);
+void RS232_CloseComport(int);
+void RS232_cputs(int, const char *);
+int RS232_IsDCDEnabled(int);
+int RS232_IsCTSEnabled(int);
+int RS232_IsDSREnabled(int);
+void RS232_enableDTR(int);
+void RS232_disableDTR(int);
+void RS232_enableRTS(int);
+void RS232_disableRTS(int);
+void RS232_flushRX(int);
+void RS232_flushTX(int);
+void RS232_flushRXTX(int);
+int RS232_GetPortnr(const char *);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif
+
+