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public class Device {
private Posix.termios newtio;
private Posix.termios restoretio;
public int fd=-1;
public int byterate;
public Device(string device, int rate, int bits, int stopbits) {
Posix.speed_t baudrate = Posix.B9600;
fd = Posix.open(device, Posix.O_RDWR /*| Posix.O_NONBLOCK*/);
if(fd < 0) {
fd = -1;
stderr.printf("Could not open device!\n");
}
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;
}
private ssize_t read(void *buf, size_t count) {
return Posix.read(fd, buf, count);
}
private ssize_t write(void *buf, size_t count) {
ssize_t size = Posix.write(fd, buf, count);
Posix.tcflush(fd, Posix.TCOFLUSH);
return size;
}
public string receive() {
char[] detected = {};
char buf[64];
while(true) {
int size = (int) this.read(buf, 64);
if(size <= 0)
error("serial device lost.\n");
for(int i = 0; i < size; i++) {
if(buf[i] != '\r' && buf[i] != '\n') {
detected += (char) buf[i];
} else {
if(detected.length > 0) {
detected += '\0';
if(((string) detected).has_prefix("USER ")) {
if(!check_code39_checksum((string) detected))
return "SCANNER RETURNED INCORRECT DATA";
else /* remove checksum */
detected[detected.length-2] = '\0';
}
if(((string) detected).has_prefix("AMOUNT ")) {
if(!check_code39_checksum((string) detected))
return "SCANNER RETURNED INCORRECT DATA";
else /* remove checksum */
detected[detected.length-2] = '\0';
}
return ((string) detected);
}
}
}
}
}
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) {
uint size = byterate/10 * duration;
var msg = new uint8[size];
Posix.memset(msg, 0xFF, msg.length);
this.write(msg, msg.length);
}
}
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