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/* Copyright 2012-2013, Sebastian Reichel <sre@ring0.de>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
[DBus (name = "io.mainframe.shopsystem.InputDevice")]
public class Device {
private Posix.termios newtio;
private Posix.termios restoretio;
private int fd=-1;
private IOChannel io_read;
private int byterate;
private File lockfile;
public signal void received_barcode(string barcode);
public Device(string device, int rate, int bits, int stopbits) {
Posix.speed_t baudrate = Posix.B9600;
try {
/* check lock file */
lockfile = File.new_for_path("/var/lock/LCK.." + device.replace("/dev/", ""));
if(lockfile.query_exists()) {
int pid = -1;
uint8[] data;
if(lockfile.load_contents(null, out data, null)) {
pid = int.parse((string) data);
} else {
error("Can't read lock file!\n");
}
if(Posix.kill(pid, 0) == 0) {
error("serial device is locked!\n");
}
}
var pid = "%d\n".printf(Posix.getpid());
lockfile.replace_contents(pid.data, null, false, FileCreateFlags.NONE, null);
fd = Posix.open(device, Posix.O_RDWR /*| Posix.O_NONBLOCK*/);
if(fd < 0) {
fd = -1;
lockfile.delete();
error("Could not open device!\n");
}
} catch(Error e) {
error("Could not create lock file: %s!\n", e.message);
}
Posix.tcflush(fd, Posix.TCIOFLUSH);
Posix.tcgetattr(fd, out restoretio);
/* apply settings */
switch(rate) {
case 300:
baudrate = Posix.B300;
break;
case 600:
baudrate = Posix.B600;
break;
case 1200:
baudrate = Posix.B1200;
break;
case 2400:
baudrate = Posix.B2400;
break;
case 4800:
baudrate = Posix.B4800;
break;
case 9600:
baudrate = Posix.B9600;
break;
case 19200:
baudrate = Posix.B19200;
break;
case 38400:
baudrate = Posix.B38400;
break;
case 57600:
baudrate = Posix.B57600;
break;
case 115200:
baudrate = Posix.B115200;
break;
case 230400:
baudrate = Posix.B230400;
break;
default:
/* not supported */
rate = 9600;
break;
}
Posix.cfsetospeed(ref newtio, baudrate);
Posix.cfsetispeed(ref newtio, baudrate);
switch(bits) {
case 5:
newtio.c_cflag = (newtio.c_cflag & ~Posix.CSIZE) | Posix.CS5;
break;
case 6:
newtio.c_cflag = (newtio.c_cflag & ~Posix.CSIZE) | Posix.CS6;
break;
case 7:
newtio.c_cflag = (newtio.c_cflag & ~Posix.CSIZE) | Posix.CS7;
break;
case 8:
default:
newtio.c_cflag = (newtio.c_cflag & ~Posix.CSIZE) | Posix.CS8;
break;
}
newtio.c_cflag |= Posix.CLOCAL | Posix.CREAD;
newtio.c_cflag &= ~(Posix.PARENB | Posix.PARODD);
/* TODO: parity */
newtio.c_cflag &= ~Linux.Termios.CRTSCTS;
if(stopbits == 2)
newtio.c_cflag |= Posix.CSTOPB;
else
newtio.c_cflag &= ~Posix.CSTOPB;
newtio.c_iflag = Posix.IGNBRK;
newtio.c_lflag = 0;
newtio.c_oflag = 0;
newtio.c_cc[Posix.VTIME]=1;
newtio.c_cc[Posix.VMIN]=1;
newtio.c_lflag &= ~(Posix.ECHONL|Posix.NOFLSH);
int mcs=0;
Posix.ioctl(fd, Linux.Termios.TIOCMGET, out mcs);
mcs |= Linux.Termios.TIOCM_RTS;
Posix.ioctl(fd, Linux.Termios.TIOCMSET, out mcs);
Posix.tcsetattr(fd, Posix.TCSANOW, newtio);
this.byterate = rate/bits;
try {
io_read = new IOChannel.unix_new(fd);
io_read.set_line_term("\r\n", 2);
if(io_read.set_encoding(null) != IOStatus.NORMAL)
error("Failed to set encoding");
if(!(io_read.add_watch(IOCondition.IN | IOCondition.HUP, device_read) != 0)) {
error("Could not bind IOChannel");
}
} catch(IOChannelError e) {
error("IOChannel: %s", e.message);
}
}
~Device() {
/* restore old tty config */
Posix.tcsetattr(fd, Posix.TCSANOW, restoretio);
/* close file */
Posix.close(fd);
/* remove lock */
lockfile.delete();
}
private bool device_read(IOChannel gio, IOCondition cond) {
IOStatus ret;
string msg;
size_t len, term_char;
if((cond & IOCondition.HUP) == IOCondition.HUP)
error("Lost device");
try {
ret = gio.read_line(out msg, out len, out term_char);
msg = msg[0:(long)term_char];
if(msg.has_prefix("USER ") || msg.has_prefix("STOCK") || msg.has_prefix("AMOUNT ")) {
if(!check_code39_checksum(msg))
received_barcode("SCANNER RETURNED INCORRECT DATA");
else {/* remove checksum */
msg = msg[0:-1];
received_barcode(msg);
}
}
else
received_barcode(msg);
}
catch(IOChannelError e) {
stderr.printf("IOChannel Error: %s", e.message);
return false;
}
catch(ConvertError e) {
stderr.printf("Convert Error: %s", e.message);
return false;
}
return true;
}
private ssize_t write(void *buf, size_t count) {
ssize_t size = Posix.write(fd, buf, count);
return size;
}
private bool check_code39_checksum(string data) {
int result = 0;
for(int i = 0; i<data.length-1; i++) {
if(data[i] >= '0' && data[i] <= '9')
result += data[i] - '0';
else if(data[i] >= 'A' && data[i] <= 'Z')
result += data[i] - 'A' + 10;
else
switch(data[i]) {
case '-':
result += 36; break;
case '.':
result += 37; break;
case ' ':
result += 38; break;
case '$':
result += 39; break;
case '/':
result += 40; break;
case '+':
result += 41; break;
case '%':
result += 42; break;
default:
/* invalid character */
return false;
}
result %= 43;
}
if(result < 10)
result = result + '0';
else if(result < 36)
result = result - 10 + 'A';
else
switch(result) {
case 36: result = '-'; break;
case 37: result = '.'; break;
case 38: result = ' '; break;
case 39: result = '$'; break;
case 40: result = '/'; break;
case 41: result = '+'; break;
case 42: result = '%'; break;
}
return (data[data.length-1] == result);
}
/**
* @param duration duration of the blink in 0.1 seconds
*/
public void blink(uint duration) throws IOError, DBusError {
uint size = (byterate/1000) * duration;
var msg = new uint8[size];
Posix.memset(msg, 0xFF, msg.length);
this.write(msg, msg.length);
}
}
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