Class: Tinkerforge::BrickletRS232V2

Inherits:
Device
  • Object
show all
Defined in:
lib/tinkerforge/bricklet_rs232_v2.rb

Overview

Communicates with RS232 devices

Constant Summary collapse

DEVICE_IDENTIFIER =

:nodoc:

2108
DEVICE_DISPLAY_NAME =

:nodoc:

'RS232 Bricklet 2.0'
CALLBACK_READ_LOW_LEVEL =

See CALLBACK_READ

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CALLBACK_ERROR_COUNT =

This callback is called if a new error occurs. It returns the current overrun and parity error count.

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CALLBACK_FRAME_READABLE =

This callback is called if at least one frame of data is readable. The frame size is configured with BrickletRS232V2#set_frame_readable_callback_configuration. The frame count parameter is the number of frames that can be read. This callback is triggered only once until BrickletRS232V2#read is called. This means, that if you have configured a frame size of X bytes, you can read exactly X bytes using the BrickletRS232V2#read function, every time the callback triggers without checking the frame count parameter.

.. versionadded

2.0.3$nbsp;(Plugin)

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CALLBACK_READ =

This callback is called if new data is available.

To enable this callback, use BrickletRS232V2#enable_read_callback.

.. note

If reconstructing the value fails, the callback is triggered with nil for message.

-12
FUNCTION_WRITE_LOW_LEVEL =

:nodoc:

1
FUNCTION_READ_LOW_LEVEL =

:nodoc:

2
FUNCTION_ENABLE_READ_CALLBACK =

:nodoc:

3
FUNCTION_DISABLE_READ_CALLBACK =

:nodoc:

4
FUNCTION_IS_READ_CALLBACK_ENABLED =

:nodoc:

5
FUNCTION_SET_CONFIGURATION =

:nodoc:

6
FUNCTION_GET_CONFIGURATION =

:nodoc:

7
FUNCTION_SET_BUFFER_CONFIG =

:nodoc:

8
FUNCTION_GET_BUFFER_CONFIG =

:nodoc:

9
FUNCTION_GET_BUFFER_STATUS =

:nodoc:

10
FUNCTION_GET_ERROR_COUNT =

:nodoc:

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FUNCTION_SET_FRAME_READABLE_CALLBACK_CONFIGURATION =

:nodoc:

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FUNCTION_GET_FRAME_READABLE_CALLBACK_CONFIGURATION =

:nodoc:

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FUNCTION_GET_SPITFP_ERROR_COUNT =

:nodoc:

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FUNCTION_SET_BOOTLOADER_MODE =

:nodoc:

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FUNCTION_GET_BOOTLOADER_MODE =

:nodoc:

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FUNCTION_SET_WRITE_FIRMWARE_POINTER =

:nodoc:

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FUNCTION_WRITE_FIRMWARE =

:nodoc:

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FUNCTION_SET_STATUS_LED_CONFIG =

:nodoc:

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FUNCTION_GET_STATUS_LED_CONFIG =

:nodoc:

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FUNCTION_GET_CHIP_TEMPERATURE =

:nodoc:

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FUNCTION_RESET =

:nodoc:

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FUNCTION_WRITE_UID =

:nodoc:

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FUNCTION_READ_UID =

:nodoc:

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FUNCTION_GET_IDENTITY =

:nodoc:

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PARITY_NONE =

:nodoc:

0
PARITY_ODD =

:nodoc:

1
PARITY_EVEN =

:nodoc:

2
STOPBITS_1 =

:nodoc:

1
STOPBITS_2 =

:nodoc:

2
WORDLENGTH_5 =

:nodoc:

5
WORDLENGTH_6 =

:nodoc:

6
WORDLENGTH_7 =

:nodoc:

7
WORDLENGTH_8 =

:nodoc:

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FLOWCONTROL_OFF =

:nodoc:

0
FLOWCONTROL_SOFTWARE =

:nodoc:

1
FLOWCONTROL_HARDWARE =

:nodoc:

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BOOTLOADER_MODE_BOOTLOADER =

:nodoc:

0
BOOTLOADER_MODE_FIRMWARE =

:nodoc:

1
BOOTLOADER_MODE_BOOTLOADER_WAIT_FOR_REBOOT =

:nodoc:

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BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_REBOOT =

:nodoc:

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BOOTLOADER_MODE_FIRMWARE_WAIT_FOR_ERASE_AND_REBOOT =

:nodoc:

4
BOOTLOADER_STATUS_OK =

:nodoc:

0
BOOTLOADER_STATUS_INVALID_MODE =

:nodoc:

1
BOOTLOADER_STATUS_NO_CHANGE =

:nodoc:

2
BOOTLOADER_STATUS_ENTRY_FUNCTION_NOT_PRESENT =

:nodoc:

3
BOOTLOADER_STATUS_DEVICE_IDENTIFIER_INCORRECT =

:nodoc:

4
BOOTLOADER_STATUS_CRC_MISMATCH =

:nodoc:

5
STATUS_LED_CONFIG_OFF =

:nodoc:

0
STATUS_LED_CONFIG_ON =

:nodoc:

1
STATUS_LED_CONFIG_SHOW_HEARTBEAT =

:nodoc:

2
STATUS_LED_CONFIG_SHOW_STATUS =

:nodoc:

3

Constants inherited from Device

Device::DEVICE_IDENTIFIER_CHECK_MATCH, Device::DEVICE_IDENTIFIER_CHECK_MISMATCH, Device::DEVICE_IDENTIFIER_CHECK_PENDING, Device::RESPONSE_EXPECTED_ALWAYS_TRUE, Device::RESPONSE_EXPECTED_FALSE, Device::RESPONSE_EXPECTED_INVALID_FUNCTION_ID, Device::RESPONSE_EXPECTED_TRUE

Instance Attribute Summary

Attributes inherited from Device

#callback_formats, #expected_response_function_id, #expected_response_sequence_number, #high_level_callbacks, #registered_callbacks, #replaced, #uid

Instance Method Summary collapse

Methods inherited from Device

#check_validity, #dequeue_response, #enqueue_response, #get_api_version, #get_response_expected, #send_request, #set_response_expected, #set_response_expected_all

Constructor Details

#initialize(uid, ipcon) ⇒ BrickletRS232V2

Creates an object with the unique device ID uid and adds it to the IP Connection ipcon.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 99

def initialize(uid, ipcon)
  super uid, ipcon, DEVICE_IDENTIFIER, DEVICE_DISPLAY_NAME

  @api_version = [2, 0, 1]

  @response_expected[FUNCTION_WRITE_LOW_LEVEL] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_READ_LOW_LEVEL] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_ENABLE_READ_CALLBACK] = RESPONSE_EXPECTED_TRUE
  @response_expected[FUNCTION_DISABLE_READ_CALLBACK] = RESPONSE_EXPECTED_TRUE
  @response_expected[FUNCTION_IS_READ_CALLBACK_ENABLED] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_CONFIGURATION] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_GET_CONFIGURATION] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_BUFFER_CONFIG] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_GET_BUFFER_CONFIG] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_BUFFER_STATUS] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_ERROR_COUNT] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_FRAME_READABLE_CALLBACK_CONFIGURATION] = RESPONSE_EXPECTED_TRUE
  @response_expected[FUNCTION_GET_FRAME_READABLE_CALLBACK_CONFIGURATION] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_SPITFP_ERROR_COUNT] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_BOOTLOADER_MODE] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_BOOTLOADER_MODE] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_WRITE_FIRMWARE_POINTER] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_WRITE_FIRMWARE] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_SET_STATUS_LED_CONFIG] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_GET_STATUS_LED_CONFIG] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_CHIP_TEMPERATURE] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_RESET] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_WRITE_UID] = RESPONSE_EXPECTED_FALSE
  @response_expected[FUNCTION_READ_UID] = RESPONSE_EXPECTED_ALWAYS_TRUE
  @response_expected[FUNCTION_GET_IDENTITY] = RESPONSE_EXPECTED_ALWAYS_TRUE

  @callback_formats[CALLBACK_READ_LOW_LEVEL] = [72, 'S S k60']
  @callback_formats[CALLBACK_ERROR_COUNT] = [16, 'L L']
  @callback_formats[CALLBACK_FRAME_READABLE] = [10, 'S']

  @high_level_callbacks[CALLBACK_READ] = [['stream_length', 'stream_chunk_offset', 'stream_chunk_data'], {'fixed_length' => nil, 'single_chunk' => false}, nil]
  @ipcon.add_device self
end

Instance Method Details

#disable_read_callback ⇒ Object

Disables the CALLBACK_READ callback.

By default the callback is disabled.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 175

def disable_read_callback
  check_validity

  send_request FUNCTION_DISABLE_READ_CALLBACK, [], '', 8, ''
end

#enable_read_callback ⇒ Object

Enables the CALLBACK_READ callback. This will disable the CALLBACK_FRAME_READABLE callback.

By default the callback is disabled.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 166

def enable_read_callback
  check_validity

  send_request FUNCTION_ENABLE_READ_CALLBACK, [], '', 8, ''
end

#get_bootloader_mode ⇒ Object

Returns the current bootloader mode, see BrickletRS232V2#set_bootloader_mode.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 295

def get_bootloader_mode
  check_validity

  send_request FUNCTION_GET_BOOTLOADER_MODE, [], '', 9, 'C'
end

#get_buffer_config ⇒ Object

Returns the buffer configuration as set by BrickletRS232V2#set_buffer_config.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 219

def get_buffer_config
  check_validity

  send_request FUNCTION_GET_BUFFER_CONFIG, [], '', 12, 'S S'
end

#get_buffer_status ⇒ Object

Returns the currently used bytes for the send and received buffer.

See BrickletRS232V2#set_buffer_config for buffer size configuration.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 228

def get_buffer_status
  check_validity

  send_request FUNCTION_GET_BUFFER_STATUS, [], '', 12, 'S S'
end

#get_chip_temperature ⇒ Object

Returns the temperature as measured inside the microcontroller. The value returned is not the ambient temperature!

The temperature is only proportional to the real temperature and it has bad accuracy. Practically it is only useful as an indicator for temperature changes.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 353

def get_chip_temperature
  check_validity

  send_request FUNCTION_GET_CHIP_TEMPERATURE, [], '', 10, 's'
end

#get_configuration ⇒ Object

Returns the configuration as set by BrickletRS232V2#set_configuration.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 197

def get_configuration
  check_validity

  send_request FUNCTION_GET_CONFIGURATION, [], '', 16, 'L C C C C'
end

#get_error_count ⇒ Object

Returns the current number of overrun and parity errors.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 235

def get_error_count
  check_validity

  send_request FUNCTION_GET_ERROR_COUNT, [], '', 16, 'L L'
end

#get_frame_readable_callback_configuration ⇒ Object

Returns the callback configuration as set by BrickletRS232V2#set_frame_readable_callback_configuration.

.. versionadded

2.0.3$nbsp;(Plugin)



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 256

def get_frame_readable_callback_configuration
  check_validity

  send_request FUNCTION_GET_FRAME_READABLE_CALLBACK_CONFIGURATION, [], '', 10, 'S'
end

#get_identity ⇒ Object

Returns the UID, the UID where the Bricklet is connected to, the position, the hardware and firmware version as well as the device identifier.

The position can be ‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’, ‘g’ or ‘h’ (Bricklet Port). A Bricklet connected to an :ref:‘Isolator Bricklet <isolator_bricklet>` is always at position ’z’.

The device identifier numbers can be found :ref:‘here <device_identifier>`. |device_identifier_constant|



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 400

def get_identity
  send_request FUNCTION_GET_IDENTITY, [], '', 33, 'Z8 Z8 k C3 C3 S'
end

#get_spitfp_error_count ⇒ Object

Returns the error count for the communication between Brick and Bricklet.

The errors are divided into

  • ACK checksum errors,

  • message checksum errors,

  • framing errors and

  • overflow errors.

The errors counts are for errors that occur on the Bricklet side. All Bricks have a similar function that returns the errors on the Brick side.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 273

def get_spitfp_error_count
  check_validity

  send_request FUNCTION_GET_SPITFP_ERROR_COUNT, [], '', 24, 'L L L L'
end

#get_status_led_config ⇒ Object

Returns the configuration as set by BrickletRS232V2#set_status_led_config



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 341

def get_status_led_config
  check_validity

  send_request FUNCTION_GET_STATUS_LED_CONFIG, [], '', 9, 'C'
end

#is_read_callback_enabled ⇒ Object

Returns true if the CALLBACK_READ callback is enabled, false otherwise.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 183

def is_read_callback_enabled
  check_validity

  send_request FUNCTION_IS_READ_CALLBACK_ENABLED, [], '', 9, '?'
end

#read(length) ⇒ Object

Returns up to length characters from receive buffer.

Instead of polling with this function, you can also use callbacks. But note that this function will return available data only when the read callback is disabled. See BrickletRS232V2#enable_read_callback and CALLBACK_READ callback.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 455

def read(length)
  message_length = nil # assigned in block
  message_data = nil # assigned in block

  @stream_mutex.synchronize {
    ret = read_low_level length
    message_length = ret[0]
    message_chunk_offset = ret[1]
    message_out_of_sync = message_chunk_offset != 0
    message_data = ret[2]

    while not message_out_of_sync and message_data.length < message_length
      ret = read_low_level length
      message_length = ret[0]
      message_chunk_offset = ret[1]
      message_out_of_sync = message_chunk_offset != message_data.length
      message_data += ret[2]
    end

    if message_out_of_sync # discard remaining stream to bring it back in-sync
      while message_chunk_offset + 60 < message_length
        ret = read_low_level length
        message_length = ret[0]
        message_chunk_offset = ret[1]
      end

      raise StreamOutOfSyncException, 'Message stream is out-of-sync'
    end
  }

  message_data[0, message_length]
end

#read_low_level(length) ⇒ Object

Returns up to length characters from receive buffer.

Instead of polling with this function, you can also use callbacks. But note that this function will return available data only when the read callback is disabled. See BrickletRS232V2#enable_read_callback and CALLBACK_READ callback.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 157

def read_low_level(length)
  check_validity

  send_request FUNCTION_READ_LOW_LEVEL, [length], 'S', 72, 'S S k60'
end

#read_uid ⇒ Object

Returns the current UID as an integer. Encode as Base58 to get the usual string version.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 384

def read_uid
  check_validity

  send_request FUNCTION_READ_UID, [], '', 12, 'L'
end

#register_callback(id, &block) ⇒ Object

Registers a callback with ID id to the block block.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 489

def register_callback(id, &block)
  callback = block
  @registered_callbacks[id] = callback
end

#reset ⇒ Object

Calling this function will reset the Bricklet. All configurations will be lost.

After a reset you have to create new device objects, calling functions on the existing ones will result in undefined behavior!



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 365

def reset
  check_validity

  send_request FUNCTION_RESET, [], '', 8, ''
end

#set_bootloader_mode(mode) ⇒ Object

Sets the bootloader mode and returns the status after the requested mode change was instigated.

You can change from bootloader mode to firmware mode and vice versa. A change from bootloader mode to firmware mode will only take place if the entry function, device identifier and CRC are present and correct.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 288

def set_bootloader_mode(mode)
  check_validity

  send_request FUNCTION_SET_BOOTLOADER_MODE, [mode], 'C', 9, 'C'
end

#set_buffer_config(send_buffer_size, receive_buffer_size) ⇒ Object

Sets the send and receive buffer size in byte. In total the buffers have to be 10240 byte (10KiB) in size, the minimum buffer size is 1024 byte (1KiB) for each.

The current buffer content is lost if this function is called.

The send buffer holds data that is given by BrickletRS232V2#write and can not be written yet. The receive buffer holds data that is received through RS232 but could not yet be send to the user, either by BrickletRS232V2#read or through CALLBACK_READ callback.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 212

def set_buffer_config(send_buffer_size, receive_buffer_size)
  check_validity

  send_request FUNCTION_SET_BUFFER_CONFIG, [send_buffer_size, receive_buffer_size], 'S S', 8, ''
end

#set_configuration(baudrate, parity, stopbits, wordlength, flowcontrol) ⇒ Object

Sets the configuration for the RS232 communication.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 190

def set_configuration(baudrate, parity, stopbits, wordlength, flowcontrol)
  check_validity

  send_request FUNCTION_SET_CONFIGURATION, [baudrate, parity, stopbits, wordlength, flowcontrol], 'L C C C C', 8, ''
end

#set_frame_readable_callback_configuration(frame_size) ⇒ Object

Configures the CALLBACK_FRAME_READABLE callback. The frame size is the number of bytes, that have to be readable to trigger the callback. A frame size of 0 disables the callback. A frame size greater than 0 enables the callback and disables the CALLBACK_READ callback.

By default the callback is disabled.

.. versionadded

2.0.3$nbsp;(Plugin)



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 247

def set_frame_readable_callback_configuration(frame_size)
  check_validity

  send_request FUNCTION_SET_FRAME_READABLE_CALLBACK_CONFIGURATION, [frame_size], 'S', 8, ''
end

#set_status_led_config(config) ⇒ Object

Sets the status LED configuration. By default the LED shows communication traffic between Brick and Bricklet, it flickers once for every 10 received data packets.

You can also turn the LED permanently on/off or show a heartbeat.

If the Bricklet is in bootloader mode, the LED is will show heartbeat by default.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 334

def set_status_led_config(config)
  check_validity

  send_request FUNCTION_SET_STATUS_LED_CONFIG, [config], 'C', 8, ''
end

#set_write_firmware_pointer(pointer) ⇒ Object

Sets the firmware pointer for BrickletRS232V2#write_firmware. The pointer has to be increased by chunks of size 64. The data is written to flash every 4 chunks (which equals to one page of size 256).

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 307

def set_write_firmware_pointer(pointer)
  check_validity

  send_request FUNCTION_SET_WRITE_FIRMWARE_POINTER, [pointer], 'L', 8, ''
end

#write(message) ⇒ Object

Writes characters to the RS232 interface. The characters can be binary data, ASCII or similar is not necessary.

The return value is the number of characters that were written.

See BrickletRS232V2#set_configuration for configuration possibilities regarding baud rate, parity and so on.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 411

def write(message)
  if message.length > 65535
    raise ArgumentError, 'Message can be at most 65535 items long'
  end

  message_length = message.length
  message_chunk_offset = 0

  if message_length == 0
    message_chunk_data = ['\0'] * 60
    ret = write_low_level message_length, message_chunk_offset, message_chunk_data
    message_written = ret
  else
    message_written = 0 # assigned in block

    @stream_mutex.synchronize {
      while message_chunk_offset < message_length
        message_chunk_data = message[message_chunk_offset, 60]

        if message_chunk_data.length < 60
          message_chunk_data += ['\0'] * (60 - message_chunk_data.length)
        end

        ret = write_low_level message_length, message_chunk_offset, message_chunk_data
        message_written += ret

        if ret < 60
          break # either last chunk or short write
        end

        message_chunk_offset += 60
      end
    }
  end

  message_written
end

#write_firmware(data) ⇒ Object

Writes 64 Bytes of firmware at the position as written by BrickletRS232V2#set_write_firmware_pointer before. The firmware is written to flash every 4 chunks.

You can only write firmware in bootloader mode.

This function is used by Brick Viewer during flashing. It should not be necessary to call it in a normal user program.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 321

def write_firmware(data)
  check_validity

  send_request FUNCTION_WRITE_FIRMWARE, [data], 'C64', 9, 'C'
end

#write_low_level(message_length, message_chunk_offset, message_chunk_data) ⇒ Object

Writes characters to the RS232 interface. The characters can be binary data, ASCII or similar is not necessary.

The return value is the number of characters that were written.

See BrickletRS232V2#set_configuration for configuration possibilities regarding baud rate, parity and so on.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 145

def write_low_level(message_length, message_chunk_offset, message_chunk_data)
  check_validity

  send_request FUNCTION_WRITE_LOW_LEVEL, [message_length, message_chunk_offset, message_chunk_data], 'S S k60', 9, 'C'
end

#write_uid(uid) ⇒ Object

Writes a new UID into flash. If you want to set a new UID you have to decode the Base58 encoded UID string into an integer first.

We recommend that you use Brick Viewer to change the UID.



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# File 'lib/tinkerforge/bricklet_rs232_v2.rb', line 376

def write_uid(uid)
  check_validity

  send_request FUNCTION_WRITE_UID, [uid], 'L', 8, ''
end