Class: SerialPort

Inherits:
IO
  • Object
show all
Defined in:
lib/serialport.rb,
lib/serialport/version.rb,
ext/native/serialport.c

Overview

This class is used for communication over a serial port. In addition to the methods here, you can use Ruby IO methods, e.g. read, write, getc, readlines, etc.

See Also:

Constant Summary

VERSION =
"1.3.0"
NONE =

0

INT2FIX(NONE)
HARD =

1

INT2FIX(HARD)
SOFT =

2

INT2FIX(SOFT)
SPACE =

0

INT2FIX(SPACE)
MARK =

1

INT2FIX(MARK)
EVEN =

2

INT2FIX(EVEN)
ODD =

3

INT2FIX(ODD)

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ (SerialPort) new(port, *params) + (SerialPort) new(port, *params)

Creates a serial port object. Accepts the port identifier and a variable list for configuration as paramaters or hash. Please see SerialPort#set_modem_params

Overloads:

  • + (SerialPort) new(port, *params)

    Parameters:

    • port (Integer)

      the serial port number, where 0 is mapped to “COM1” on Windows, “/dev/ttyS0” on Linux, “/dev/cuaa0” on Mac OS X, etc.

  • + (SerialPort) new(port, *params)

    Parameters:

    • port (String)

      the serial port file e.g. “/dev/ttyS0”

Returns:

See Also:



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# File 'lib/serialport.rb', line 24

def SerialPort::new(port, *params)
   sp = create(port)
   begin
      sp.set_modem_params(*params)
   rescue
      sp.close
      raise
   end
   return sp
end

+ (Object) open(port, *params) {|SerialPort| ... }

This behaves like SerialPort#new, except that you can pass a block to which the new serial port object will be passed. In this case the connection is automaticaly closed when the block has finished.

Yields:

  • (SerialPort)

    the serial port number or filename

See Also:



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# File 'lib/serialport.rb', line 42

def SerialPort::open(port, *params)
   sp = create(port)
   begin
      sp.set_modem_params(*params)
   rescue
      sp.close
      raise
   end
   if (block_given?)
     begin
        yield sp
     ensure
        sp.close
     end
     return nil
   end
   return sp
end

Instance Method Details

- (Integer) baud

Get the current baud rate

Returns:

  • (Integer)

    the current baud rate

See Also:



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# File 'ext/native/serialport.c', line 305

static VALUE sp_get_data_rate(self)
VALUE self;

- (Integer) baud=

Set the baud rate

Parameters:

  • data_rate (Integer)

    the baud rate

Returns:

  • (Integer)

    the original data_rate parameter

See Also:



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# File 'ext/native/serialport.c', line 230

static VALUE sp_set_data_rate(self, data_rate)
VALUE self, data_rate;

- (nil) break

Note:

(POSIX) this value is very approximate

Send a break for the given time

Parameters:

  • time (Integer)

    break time in tenths-of-a-second

Returns:

  • (nil)


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# File 'ext/native/serialport.c', line 76

static VALUE sp_break(self, time)
VALUE self, time;

- (Integer) cts

Get the state of the CTS line

Returns:

  • (Integer)

    the state of the CTS line, 0 or 1

See Also:



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# File 'ext/native/serialport.c', line 403

static VALUE sp_get_cts(self)
VALUE self;

- (Integer) data_bits

Get the current data bits

Returns:

  • (Integer)

    the current number of data bits

See Also:



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# File 'ext/native/serialport.c', line 321

static VALUE sp_get_data_bits(self)
VALUE self;

- (Integer) data_bits=

Set the data bits

Parameters:

  • data_bits (Integer)

    the number of data bits

Returns:

  • (Integer)

    the original data_bits parameter

See Also:



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# File 'ext/native/serialport.c', line 249

static VALUE sp_set_data_bits(self, data_bits)
VALUE self, data_bits;

- (Integer) dcd

Get the state of the DCD line

Returns:

  • (Integer)

    the state of the DCD line, 0 or 1

See Also:



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# File 'ext/native/serialport.c', line 435

static VALUE sp_get_dcd(self)
VALUE self;

- (Integer) dsr

Get the state of the DSR line

Returns:

  • (Integer)

    the state of the DSR line, 0 or 1

See Also:



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# File 'ext/native/serialport.c', line 419

static VALUE sp_get_dsr(self)
VALUE self;

- (Integer) dtr

Note:

(Windows) DTR is not available

Get the state of the DTR line

Returns:

  • (Integer)

    the state of DTR line, 0 or 1



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# File 'ext/native/serialport.c', line 88

static VALUE sp_get_dtr(self)
VALUE self;

- (Integer) dtr=

Set the state of the DTR line

Parameters:

  • val (Integer)

    the desired state of the DTR line, 0 or 1

Returns:

  • (Integer)

    the original val parameter



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# File 'ext/native/serialport.c', line 148

static VALUE sp_set_dtr(self, val)
VALUE self, val;

- (Integer) flow_control

Get the flow control flag

Returns:

  • (Integer)

    the flow control flag

See Also:

  • #set_flow_control


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# File 'ext/native/serialport.c', line 100

static VALUE sp_get_flow_control(self)
VALUE self;

- (Integer) flow_control=

Note:

SerialPort::HARD mode is not supported on all platforms.

Note:

SerialPort::HARD uses RTS/CTS handshaking. DSR/DTR is not supported.

Set the flow control

Parameters:

  • val (Integer)

    the flow control flag, NONE, HARD, SOFT, or (HARD | SOFT)

Returns:

  • (Integer)

    the original val parameter



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# File 'ext/native/serialport.c', line 164

static VALUE sp_set_flow_control(self, val)
VALUE self, val;

- (Boolean) flush_input

Flush data received but not read.

Returns:

  • (Boolean)

    true on success or false if an error occurs.



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# File 'ext/native/serialport.c', line 497

static VALUE sp_flush_input_data(self)
VALUE self;

- (Boolean) flush_output

Flush data written but not transmitted.

Returns:

  • (Boolean)

    true on success or false if an error occurs.



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# File 'ext/native/serialport.c', line 508

static VALUE sp_flush_output_data(self)
VALUE self;

- (Hash) get_modem_params

Get the configure of the serial port

Returns:

  • (Hash)

    the serial port configuration

See Also:



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# File 'ext/native/serialport.c', line 369

static VALUE sp_get_modem_params(self)
VALUE self;

- (Hash) get_signals

Note:

(Windows) the rts and dtr values are not included

Note:

This method is implemented as both SerialPort#signals and SerialPort#get_signals

Return a hash with the state of each line status bit. Keys:

"rts", "dtr", "cts", "dsr", "dcd", and "ri".

Returns:

  • (Hash)

    the state line info



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# File 'ext/native/serialport.c', line 470

static VALUE sp_signals(self)
VALUE self;

- (Hash) modem_params

Get the configure of the serial port

Returns:

  • (Hash)

    the serial port configuration

See Also:



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# File 'ext/native/serialport.c', line 369

static VALUE sp_get_modem_params(self)
VALUE self;

- (Hash) set_modem_params(baud, data_bits, stop_bits, parity) - (Hash) set_modem_params(hash)

Configure the serial port. You can pass a hash or multiple values as separate arguments. Invalid or unsupported values will raise an ArgumentError.

When using a hash the following keys are recognized:

“baud”

Integer from 50 to 256000, depending on platform

“data_bits”

Integer from 5 to 8 (4 is allowed on Windows too)

“stop_bits”

Integer, only allowed values are 1 or 2 (1.5 is not supported)

“parity”

One of the constants NONE, EVEN or ODD (Windows allows also MARK and SPACE)

When using separate arguments, they are interpreted as:

(baud, data_bits = 8, stop_bits = 1, parity = (previous_databits == 8 ? NONE : EVEN))

A baudrate of nil will keep the old value. The default parity depends on the number of databits configured before this function call.

Overloads:

  • - (Hash) set_modem_params(baud, data_bits, stop_bits, parity)

    Parameters:

    • baud (Integer)

      the baud rate

    • data_bits (Integer)

      the number of data bits

    • stop_bits (Integer)

      the number of stop bits

    • parity (Integer)

      the type of parity checking

  • - (Hash) set_modem_params(hash)

    Parameters:

    • opts (Hash)

      the options to configure port

Returns:

  • (Hash)

    the original paramters

Raises:

  • (ArgumentError)

    if values are invalide or unsupported



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# File 'ext/native/serialport.c', line 62

static VALUE sp_set_modem_params(argc, argv, self)
int argc;

- (Integer) parity

Get the current parity

Returns:

  • (Integer)

    the current parity

See Also:



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# File 'ext/native/serialport.c', line 353

static VALUE sp_get_parity(self)
VALUE self;

- (Integer) parity=

Set the parity

Parameters:

  • parity (Integer)

    the parity type

Returns:

  • (Integer)

    the original parity parameter

See Also:



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# File 'ext/native/serialport.c', line 287

static VALUE sp_set_parity(self, parity)
VALUE self, parity;

- (Integer) read_timeout

Get the read timeout value

Returns:

  • (Integer)

    the read timeout, in milliseconds

See Also:

  • #set_read_timeout


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# File 'ext/native/serialport.c', line 112

static VALUE sp_get_read_timeout(self)
VALUE self;

- (Integer) read_timeout=

Note:

Read timeouts don't mix well with multi-threading

Set the timeout value (in milliseconds) for reading. A negative read timeout will return all the available data without waiting, a zero read timeout will not return until at least one byte is available, and a positive read timeout returns when the requested number of bytes is available or the interval between the arrival of two bytes exceeds the timeout value.

Parameters:

  • timeout (Integer)

    the read timeout in milliseconds

Returns:

  • (Integer)

    the original timeout parameter



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# File 'ext/native/serialport.c', line 182

static VALUE sp_set_read_timeout(self, val)
VALUE self, val;

- (Integer) ri

Get the state of the RI line

Returns:

  • (Integer)

    the state of the RI line, 0 or 1

See Also:



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# File 'ext/native/serialport.c', line 451

static VALUE sp_get_ri(self)
VALUE self;

- (Integer) rts

Note:

(Windows) RTS is not available

Get the state of the RTS line

Returns:

  • (Integer)

    the state of RTS line, 0 or 1



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# File 'ext/native/serialport.c', line 124

static VALUE sp_get_rts(self)
VALUE self;

- (Integer) rts=

Set the state of the RTS line

Parameters:

  • val (Integer)

    the state of RTS line, 0 or 1

Returns:

  • (Integer)

    the original val parameter



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# File 'ext/native/serialport.c', line 194

static VALUE sp_set_rts(self, val)
VALUE self, val;

- (Hash) set_modem_params(baud, data_bits, stop_bits, parity) - (Hash) set_modem_params(hash)

Configure the serial port. You can pass a hash or multiple values as separate arguments. Invalid or unsupported values will raise an ArgumentError.

When using a hash the following keys are recognized:

“baud”

Integer from 50 to 256000, depending on platform

“data_bits”

Integer from 5 to 8 (4 is allowed on Windows too)

“stop_bits”

Integer, only allowed values are 1 or 2 (1.5 is not supported)

“parity”

One of the constants NONE, EVEN or ODD (Windows allows also MARK and SPACE)

When using separate arguments, they are interpreted as:

(baud, data_bits = 8, stop_bits = 1, parity = (previous_databits == 8 ? NONE : EVEN))

A baudrate of nil will keep the old value. The default parity depends on the number of databits configured before this function call.

Overloads:

  • - (Hash) set_modem_params(baud, data_bits, stop_bits, parity)

    Parameters:

    • baud (Integer)

      the baud rate

    • data_bits (Integer)

      the number of data bits

    • stop_bits (Integer)

      the number of stop bits

    • parity (Integer)

      the type of parity checking

  • - (Hash) set_modem_params(hash)

    Parameters:

    • opts (Hash)

      the options to configure port

Returns:

  • (Hash)

    the original paramters

Raises:

  • (ArgumentError)

    if values are invalide or unsupported



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# File 'ext/native/serialport.c', line 62

static VALUE sp_set_modem_params(argc, argv, self)
int argc;

- (Hash) signals

Note:

(Windows) the rts and dtr values are not included

Note:

This method is implemented as both SerialPort#signals and SerialPort#get_signals

Return a hash with the state of each line status bit. Keys:

"rts", "dtr", "cts", "dsr", "dcd", and "ri".

Returns:

  • (Hash)

    the state line info



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# File 'ext/native/serialport.c', line 470

static VALUE sp_signals(self)
VALUE self;

- (Integer) stop_bits

Get the current stop bits

Returns:

  • (Integer)

    the current number of stop bits

See Also:



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# File 'ext/native/serialport.c', line 337

static VALUE sp_get_stop_bits(self)
VALUE self;

- (Integer) stop_bits=

Set the stop bits

Parameters:

  • stop_bits (Integer)

    the number of stop bits

Returns:

  • (Integer)

    the original stop_bits parameter

See Also:



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# File 'ext/native/serialport.c', line 268

static VALUE sp_set_stop_bits(self, stop_bits)
VALUE self, stop_bits;

- (Integer) write_timeout

Note:

(POSIX) write timeouts are not implemented

Get the write timeout

Returns:

  • (Integer)

    the write timeout, in milliseconds



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# File 'ext/native/serialport.c', line 136

static VALUE sp_get_write_timeout(self)
VALUE self;

- (Integer) write_timeout=

Note:

(POSIX) write timeouts are not implemented

Set a write timeout

Parameters:

  • val (Integer)

    the write timeout in milliseconds

Returns:

  • (Integer)

    the original val parameter



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# File 'ext/native/serialport.c', line 207

static VALUE sp_set_write_timeout(self, val)
VALUE self, val;