Fwd: Re: C program to write to the com port - RESOLVED
From: vittorio (vdemart1_at_tin.it)
Date: 09/09/05
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To: freebsd-questions@freebsd.org Date: Fri, 9 Sep 2005 13:53:49 +0200
As a C++ absolute beginner I'm trying to compile your testssc.c file with
g++ testssc.c -o testssc
(under freebsd 5.4, gcc version 3.4.2)
But...
I only get:
SerialPort.C: In function `int main(int, char*)':
SerialPort.C:62: error: invalid conversion from `unsigned char*' to `char*'
SerialPort.C:62: error: initializing argument 1 of `int snprintf(char*,
size_t, const char*, ...)'
SerialPort.C:66: error: `err' undeclared (first use this function)
SerialPort.C:66: error: (Each undeclared identifier is reported only once for
each function it appears in.)
SerialPort.C:69:3: warning: no newline at end of file
Could you please help to straighten things up?
Vittorio
---------- Messaggio inoltrato ----------
Subject: Re: C program to write to the com port - RESOLVED
Date: 02:23, venerd́ 09 settembre 2005
From: "Paul Hamilton" <paulh@bdug.org.au>
To: freebsd-questions@freebsd.org
.....................................................................
----------------------------------------------------------------------------
--------
/* Name: testssc.c
* compile with: gcc testssc.c -o testssc
*
* Your serial cable should be plugged into com port 1.
* You only need the pin 3 and pin 5 (DB9) plugged into the controller.
* The servo should be plugged into the first servo channel/port.
* This test program when run will move the servo from midrange,
* to position 01. This is for demonstrational use only.
* Tested with FreeBSD 5.4
* Paul Hamilton 8th Aug 2005
*/
#include <sys/time.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h> /*Originally it was termio.h*/
#include <stdio.h>
#include <unistd.h>
// Use serial port 0 (com port 1)
static char *opt_comport="/dev/cuaa0";
int main(int argc, char **argv)
{
int fd;
struct termios options;
unsigned char buf[4];
// ok, lets try opening the com port
printf("Opening Com port: %s\n\n", opt_comport);
if((fd = open(opt_comport, O_RDWR | O_NOCTTY )) < 0)
{
printf("Problems opening %s\n", opt_comport);
return (-1);
}
// set the required com port parrameters
options.c_cflag &= ~CSIZE; /* Mask the character size bits */
options.c_cflag |= CS8; /* Select 8 data bits */
options.c_cflag &= ~PARENB; // set no parity
options.c_cflag &= ~CSTOPB; // set 1 stop bit
options.c_oflag &= ~OPOST; // Raw output
tcgetattr(fd, &options);
/*
* Set the baud rates to 9600...
*/
cfsetispeed(&options, B9600);
cfsetospeed(&options, B9600);
/*
* Enable the receiver and set local mode...
*/
options.c_cflag |= (CLOCAL | CREAD);
/*
* Set the new options for the port...
*/
tcsetattr(fd, TCSANOW, &options);
// ok, lets transmit our 3 bytes through com port 1
snprintf(buf,4,"%c%c%c%c",0xff,0x00,0x01,0);
printf("buf=%x,%x,%x,%x\n", buf[0],buf[1],buf[2],buf[3]);
if (write(fd, buf, 3) != 3)
err(1, "write");
close(fd);
};
----------------------------------------------------------------------------
--------
Cheers,
Paul Hamilton
PS. I have three books on programming in C winging their way to Australia.
I have a lot to learn :-)
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