MATLAB/Octave - IO-16 Bricklet

This is the description of the MATLAB/Octave API bindings for the IO-16 Bricklet. General information and technical specifications for the IO-16 Bricklet are summarized in its hardware description.

An installation guide for the MATLAB/Octave API bindings is part of their general description.

Examples

The example code below is Public Domain (CC0 1.0).

Output (MATLAB)

Download (matlab_example_output.m)

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function matlab_example_output()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletIO16;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = IPConnection(); % Create IP connection
    io = handle(BrickletIO16(UID, ipcon), 'CallbackProperties'); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Set pin 0 on port A to output low
    io.setPortConfiguration('a', bitshift(1, 0), 'o', false);

    % Set pin 0 and 7 on port B to output high
    io.setPortConfiguration('b', bitor(bitshift(1, 0), bitshift(1, 7)), 'o', true);

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

Input (MATLAB)

Download (matlab_example_input.m)

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function matlab_example_input()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletIO16;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = IPConnection(); % Create IP connection
    io = handle(BrickletIO16(UID, ipcon), 'CallbackProperties'); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Get current value from port A as bitmask
    valueMaskA = io.getPort('a');
    fprintf('Value Mask (Port A): %s\n', dec2bin(valueMaskA));

    % Get current value from port B as bitmask
    valueMaskB = io.getPort('b');
    fprintf('Value Mask (Port B): %s\n', dec2bin(valueMaskB));

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

Interrupt (MATLAB)

Download (matlab_example_interrupt.m)

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function matlab_example_interrupt()
    import com.tinkerforge.IPConnection;
    import com.tinkerforge.BrickletIO16;

    HOST = 'localhost';
    PORT = 4223;
    UID = 'XYZ'; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = IPConnection(); % Create IP connection
    io = handle(BrickletIO16(UID, ipcon), 'CallbackProperties'); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Register interrupt callback to function cb_interrupt
    set(io, 'InterruptCallback', @(h, e) cb_interrupt(e));

    % Enable interrupt on pin 2 of port A
    io.setPortInterrupt('a', bitshift(1, 2));

    input('Press key to exit\n', 's');
    ipcon.disconnect();
end

% Callback function for interrupt callback
function cb_interrupt(e)
    fprintf('Port: %s\n', e.port);
    fprintf('Interrupt Mask: %s\n', dec2bin(e.interruptMask));
    fprintf('Value Mask: %s\n', dec2bin(e.valueMask));
    fprintf('\n');
end

Output (Octave)

Download (octave_example_output.m)

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function octave_example_output()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    io = javaObject("com.tinkerforge.BrickletIO16", UID, ipcon); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Set pin 0 on port A to output low
    io.setPortConfiguration("a", bitshift(1, 0), "o", false);

    % Set pin 0 and 7 on port B to output high
    io.setPortConfiguration("b", bitor(bitshift(1, 0), bitshift(1, 7)), "o", true);

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

Input (Octave)

Download (octave_example_input.m)

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function octave_example_input()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    io = javaObject("com.tinkerforge.BrickletIO16", UID, ipcon); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Get current value from port A as bitmask
    valueMaskA = io.getPort("a");
    fprintf("Value Mask (Port A): %s\n", dec2bin(java2int(valueMaskA)));

    % Get current value from port B as bitmask
    valueMaskB = io.getPort("b");
    fprintf("Value Mask (Port B): %s\n", dec2bin(java2int(valueMaskB)));

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

function int = java2int(value)
    if compare_versions(version(), "3.8", "<=")
        int = value.intValue();
    else
        int = value;
    end
end

Interrupt (Octave)

Download (octave_example_interrupt.m)

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function octave_example_interrupt()
    more off;

    HOST = "localhost";
    PORT = 4223;
    UID = "XYZ"; % Change XYZ to the UID of your IO-16 Bricklet

    ipcon = javaObject("com.tinkerforge.IPConnection"); % Create IP connection
    io = javaObject("com.tinkerforge.BrickletIO16", UID, ipcon); % Create device object

    ipcon.connect(HOST, PORT); % Connect to brickd
    % Don't use device before ipcon is connected

    % Register interrupt callback to function cb_interrupt
    io.addInterruptCallback(@cb_interrupt);

    % Enable interrupt on pin 2 of port A
    io.setPortInterrupt("a", bitshift(1, 2));

    input("Press key to exit\n", "s");
    ipcon.disconnect();
end

% Callback function for interrupt callback
function cb_interrupt(e)
    fprintf("Port: %s\n", e.port);
    fprintf("Interrupt Mask: %s\n", dec2bin(java2int(e.interruptMask)));
    fprintf("Value Mask: %s\n", dec2bin(java2int(e.valueMask)));
    fprintf("\n");
end

function int = java2int(value)
    if compare_versions(version(), "3.8", "<=")
        int = value.intValue();
    else
        int = value;
    end
end

API

Generally, every method of the MATLAB bindings that returns a value can throw a TimeoutException. This exception gets thrown if the device did not respond. If a cable based connection is used, it is unlikely that this exception gets thrown (assuming nobody unplugs the device). However, if a wireless connection is used, timeouts will occur if the distance to the device gets too big.

Beside the TimeoutException there is also a NotConnectedException that is thrown if a method needs to communicate with the device while the IP Connection is not connected.

Since the MATLAB bindings are based on Java and Java does not support multiple return values and return by reference is not possible for primitive types, we use small classes that only consist of member variables. The member variables of the returned objects are described in the corresponding method descriptions.

The package for all Brick/Bricklet bindings and the IP Connection is com.tinkerforge.*

All methods listed below are thread-safe.

Basic Functions

class BrickletIO16(String uid, IPConnection ipcon)
Parameters:
  • uid – Type: String
  • ipcon – Type: IPConnection
Returns:
  • io16 – Type: BrickletIO16

Creates an object with the unique device ID uid.

In MATLAB:

import com.tinkerforge.BrickletIO16;

io16 = BrickletIO16('YOUR_DEVICE_UID', ipcon);

In Octave:

io16 = java_new("com.tinkerforge.BrickletIO16", "YOUR_DEVICE_UID", ipcon);

This object can then be used after the IP Connection is connected.

void BrickletIO16.setPort(char port, short valueMask)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • valueMask – Type: short, Range: [0 to 255]

Sets the output value (high or low) for a port ("a" or "b") with a bitmask (8bit). A 1 in the bitmask means high and a 0 in the bitmask means low.

For example: The value 15 or 0b00001111 will turn the pins 0-3 high and the pins 4-7 low for the specified port.

All running monoflop timers of the given port will be aborted if this function is called.

Note

This function does nothing for pins that are configured as input. Pull-up resistors can be switched on with setPortConfiguration().

short BrickletIO16.getPort(char port)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
Returns:
  • valueMask – Type: short, Range: [0 to 255]

Returns a bitmask of the values that are currently measured on the specified port. This function works if the pin is configured to input as well as if it is configured to output.

void BrickletIO16.setPortConfiguration(char port, short selectionMask, char direction, boolean value)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • selectionMask – Type: short, Range: [0 to 255]
  • direction – Type: char, Range: See constants, Default: 'i'
  • value – Type: boolean, Default: true

Configures the value and direction of a specified port. Possible directions are 'i' and 'o' for input and output.

If the direction is configured as output, the value is either high or low (set as true or false).

If the direction is configured as input, the value is either pull-up or default (set as true or false).

For example:

  • ('a', 255, 'i', true) or ('a', 0b11111111, 'i', true) will set all pins of port A as input pull-up.
  • ('a', 128, 'i', false) or ('a', 0b10000000, 'i', false) will set pin 7 of port A as input default (floating if nothing is connected).
  • ('b', 3, 'o', false) or ('b', 0b00000011, 'o', false) will set pins 0 and 1 of port B as output low.
  • ('b', 4, 'o', true) or ('b', 0b00000100, 'o', true) will set pin 2 of port B as output high.

Running monoflop timers for the selected pins will be aborted if this function is called.

The following constants are available for this function:

For direction:

  • BrickletIO16.DIRECTION_IN = 'i'
  • BrickletIO16.DIRECTION_OUT = 'o'
BrickletIO16.PortConfiguration BrickletIO16.getPortConfiguration(char port)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
Return Object:
  • directionMask – Type: short, Range: [0 to 255]
  • valueMask – Type: short, Range: [0 to 255]

Returns a direction bitmask and a value bitmask for the specified port. A 1 in the direction bitmask means input and a 0 in the bitmask means output.

For example: A return value of (15, 51) or (0b00001111, 0b00110011) for direction and value means that:

  • pins 0 and 1 are configured as input pull-up,
  • pins 2 and 3 are configured as input default,
  • pins 4 and 5 are configured as output high
  • and pins 6 and 7 are configured as output low.
long BrickletIO16.getEdgeCount(short pin, boolean resetCounter)
Parameters:
  • pin – Type: short, Range: [0 to 1]
  • resetCounter – Type: boolean
Returns:
  • count – Type: long, Range: [0 to 232 - 1]

Returns the current value of the edge counter for the selected pin on port A. You can configure the edges that are counted with setEdgeCountConfig().

If you set the reset counter to true, the count is set back to 0 directly after it is read.

New in version 2.0.3 (Plugin).

Advanced Functions

void BrickletIO16.setPortMonoflop(char port, short selectionMask, short valueMask, long time)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • selectionMask – Type: short, Range: [0 to 255]
  • valueMask – Type: short, Range: [0 to 255]
  • time – Type: long, Unit: 1 ms, Range: [0 to 232 - 1]

Configures a monoflop of the pins specified by the second parameter as 8 bit long bitmask. The specified pins must be configured for output. Non-output pins will be ignored.

The third parameter is a bitmask with the desired value of the specified output pins. A 1 in the bitmask means high and a 0 in the bitmask means low.

The forth parameter indicates the time that the pins should hold the value.

If this function is called with the parameters ('a', 9, 1, 1500) or ('a', 0b00001001, 0b00000001, 1500): Pin 0 will get high and pin 3 will get low on port 'a'. In 1.5s pin 0 will get low and pin 3 will get high again.

A monoflop can be used as a fail-safe mechanism. For example: Lets assume you have a RS485 bus and an IO-16 Bricklet connected to one of the slave stacks. You can now call this function every second, with a time parameter of two seconds and pin 0 set to high. Pin 0 will be high all the time. If now the RS485 connection is lost, then pin 0 will get low in at most two seconds.

BrickletIO16.PortMonoflop BrickletIO16.getPortMonoflop(char port, short pin)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • pin – Type: short, Range: [0 to 7]
Return Object:
  • value – Type: short, Range: [0 to 255]
  • time – Type: long, Unit: 1 ms, Range: [0 to 232 - 1]
  • timeRemaining – Type: long, Unit: 1 ms, Range: [0 to 232 - 1]

Returns (for the given pin) the current value and the time as set by setPortMonoflop() as well as the remaining time until the value flips.

If the timer is not running currently, the remaining time will be returned as 0.

void BrickletIO16.setSelectedValues(char port, short selectionMask, short valueMask)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • selectionMask – Type: short, Range: [0 to 255]
  • valueMask – Type: short, Range: [0 to 255]

Sets the output value (high or low) for a port ("a" or "b" with a bitmask, according to the selection mask. The bitmask is 8 bit long and a 1 in the bitmask means high and a 0 in the bitmask means low.

For example: The parameters ('a', 192, 128) or ('a', 0b11000000, 0b10000000) will turn pin 7 high and pin 6 low on port A, pins 0-6 will remain untouched.

Running monoflop timers for the selected pins will be aborted if this function is called.

Note

This function does nothing for pins that are configured as input. Pull-up resistors can be switched on with setPortConfiguration().

void BrickletIO16.setEdgeCountConfig(short pin, short edgeType, short debounce)
Parameters:
  • pin – Type: short, Range: [0 to 1]
  • edgeType – Type: short, Range: See constants, Default: 0
  • debounce – Type: short, Unit: 1 ms, Range: [0 to 255], Default: 100

Configures the edge counter for the selected pin of port A. Pins 0 and 1 are available for edge counting.

The edge type parameter configures if rising edges, falling edges or both are counted if the pin is configured for input. Possible edge types are:

  • 0 = rising
  • 1 = falling
  • 2 = both

Configuring an edge counter resets its value to 0.

If you don't know what any of this means, just leave it at default. The default configuration is very likely OK for you.

The following constants are available for this function:

For edgeType:

  • BrickletIO16.EDGE_TYPE_RISING = 0
  • BrickletIO16.EDGE_TYPE_FALLING = 1
  • BrickletIO16.EDGE_TYPE_BOTH = 2

New in version 2.0.3 (Plugin).

BrickletIO16.EdgeCountConfig BrickletIO16.getEdgeCountConfig(short pin)
Parameters:
  • pin – Type: short, Range: [0 to 1]
Return Object:
  • edgeType – Type: short, Range: See constants, Default: 0
  • debounce – Type: short, Unit: 1 ms, Range: [0 to 255], Default: 100

Returns the edge type and debounce time for the selected pin of port A as set by setEdgeCountConfig().

The following constants are available for this function:

For edgeType:

  • BrickletIO16.EDGE_TYPE_RISING = 0
  • BrickletIO16.EDGE_TYPE_FALLING = 1
  • BrickletIO16.EDGE_TYPE_BOTH = 2

New in version 2.0.3 (Plugin).

BrickletIO16.Identity BrickletIO16.getIdentity()
Return Object:
  • uid – Type: String, Length: up to 8
  • connectedUid – Type: String, Length: up to 8
  • position – Type: char, Range: ['a' to 'h', 'z']
  • hardwareVersion – Type: short[], Length: 3
    • 1: major – Type: short, Range: [0 to 255]
    • 2: minor – Type: short, Range: [0 to 255]
    • 3: revision – Type: short, Range: [0 to 255]
  • firmwareVersion – Type: short[], Length: 3
    • 1: major – Type: short, Range: [0 to 255]
    • 2: minor – Type: short, Range: [0 to 255]
    • 3: revision – Type: short, Range: [0 to 255]
  • deviceIdentifier – Type: int, Range: [0 to 216 - 1]

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 Isolator Bricklet is always at position 'z'.

The device identifier numbers can be found here. There is also a constant for the device identifier of this Bricklet.

Callback Configuration Functions

void BrickletIO16.setDebouncePeriod(long debounce)
Parameters:
  • debounce – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100

Sets the debounce period of the InterruptCallback callback.

For example: If you set this value to 100, you will get the interrupt maximal every 100ms. This is necessary if something that bounces is connected to the IO-16 Bricklet, such as a button.

long BrickletIO16.getDebouncePeriod()
Returns:
  • debounce – Type: long, Unit: 1 ms, Range: [0 to 232 - 1], Default: 100

Returns the debounce period as set by setDebouncePeriod().

void BrickletIO16.setPortInterrupt(char port, short interruptMask)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
  • interruptMask – Type: short, Range: [0 to 255]

Sets the pins on which an interrupt is activated with a bitmask. Interrupts are triggered on changes of the voltage level of the pin, i.e. changes from high to low and low to high.

For example: ('a', 129) or ('a', 0b10000001) will enable the interrupt for pins 0 and 7 of port a.

The interrupt is delivered with the InterruptCallback callback.

short BrickletIO16.getPortInterrupt(char port)
Parameters:
  • port – Type: char, Range: ['a' to 'b']
Returns:
  • interruptMask – Type: short, Range: [0 to 255]

Returns the interrupt bitmask for the specified port as set by setPortInterrupt().

Callbacks

Callbacks can be registered to receive time critical or recurring data from the device. The registration is done with "set" function of MATLAB. The parameters consist of the IP Connection object, the callback name and the callback function. For example, it looks like this in MATLAB:

function my_callback(e)
    fprintf('Parameter: %s\n', e.param);
end

set(device, 'ExampleCallback', @(h, e) my_callback(e));

Due to a difference in the Octave Java support the "set" function cannot be used in Octave. The registration is done with "add*Callback" functions of the device object. It looks like this in Octave:

function my_callback(e)
    fprintf("Parameter: %s\n", e.param);
end

device.addExampleCallback(@my_callback);

It is possible to add several callbacks and to remove them with the corresponding "remove*Callback" function.

The parameters of the callback are passed to the callback function as fields of the structure e, which is derived from the java.util.EventObject class. The available callback names with corresponding structure fields are described below.

Note

Using callbacks for recurring events is always preferred compared to using getters. It will use less USB bandwidth and the latency will be a lot better, since there is no round trip time.

callback BrickletIO16.InterruptCallback
Event Object:
  • port – Type: char, Range: ['a' to 'b']
  • interruptMask – Type: short, Range: [0 to 255]
  • valueMask – Type: short, Range: [0 to 255]

This callback is triggered whenever a change of the voltage level is detected on pins where the interrupt was activated with setPortInterrupt().

The values are the port, a bitmask that specifies which interrupts occurred and the current value bitmask of the port.

For example:

  • ('a', 1, 1) or ('a', 0b00000001, 0b00000001) means that on port A an interrupt on pin 0 occurred and currently pin 0 is high and pins 1-7 are low.
  • ('b', 129, 254) or ('b', 0b10000001, 0b11111110) means that on port B interrupts on pins 0 and 7 occurred and currently pin 0 is low and pins 1-7 are high.

In MATLAB the set() function can be used to register a callback function to this callback.

In Octave a callback function can be added to this callback using the addInterruptCallback() function. An added callback function can be removed with the removeInterruptCallback() function.

callback BrickletIO16.MonoflopDoneCallback
Event Object:
  • port – Type: char, Range: ['a' to 'b']
  • selectionMask – Type: short, Range: [0 to 255]
  • valueMask – Type: short, Range: [0 to 255]

This callback is triggered whenever a monoflop timer reaches 0. The parameters contain the port, the involved pins and the current value of the pins (the value after the monoflop).

In MATLAB the set() function can be used to register a callback function to this callback.

In Octave a callback function can be added to this callback using the addMonoflopDoneCallback() function. An added callback function can be removed with the removeMonoflopDoneCallback() function.

Virtual Functions

Virtual functions don't communicate with the device itself, but operate only on the API bindings device object. They can be called without the corresponding IP Connection object being connected.

short[] BrickletIO16.getAPIVersion()
Return Object:
  • apiVersion – Type: short[], Length: 3
    • 1: major – Type: short, Range: [0 to 255]
    • 2: minor – Type: short, Range: [0 to 255]
    • 3: revision – Type: short, Range: [0 to 255]

Returns the version of the API definition implemented by this API bindings. This is neither the release version of this API bindings nor does it tell you anything about the represented Brick or Bricklet.

boolean BrickletIO16.getResponseExpected(byte functionId)
Parameters:
  • functionId – Type: byte, Range: See constants
Returns:
  • responseExpected – Type: boolean

Returns the response expected flag for the function specified by the function ID parameter. It is true if the function is expected to send a response, false otherwise.

For getter functions this is enabled by default and cannot be disabled, because those functions will always send a response. For callback configuration functions it is enabled by default too, but can be disabled by setResponseExpected(). For setter functions it is disabled by default and can be enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

  • BrickletIO16.FUNCTION_SET_PORT = 1
  • BrickletIO16.FUNCTION_SET_PORT_CONFIGURATION = 3
  • BrickletIO16.FUNCTION_SET_DEBOUNCE_PERIOD = 5
  • BrickletIO16.FUNCTION_SET_PORT_INTERRUPT = 7
  • BrickletIO16.FUNCTION_SET_PORT_MONOFLOP = 10
  • BrickletIO16.FUNCTION_SET_SELECTED_VALUES = 13
  • BrickletIO16.FUNCTION_SET_EDGE_COUNT_CONFIG = 15
void BrickletIO16.setResponseExpected(byte functionId, boolean responseExpected)
Parameters:
  • functionId – Type: byte, Range: See constants
  • responseExpected – Type: boolean

Changes the response expected flag of the function specified by the function ID parameter. This flag can only be changed for setter (default value: false) and callback configuration functions (default value: true). For getter functions it is always enabled.

Enabling the response expected flag for a setter function allows to detect timeouts and other error conditions calls of this setter as well. The device will then send a response for this purpose. If this flag is disabled for a setter function then no response is sent and errors are silently ignored, because they cannot be detected.

The following constants are available for this function:

For functionId:

  • BrickletIO16.FUNCTION_SET_PORT = 1
  • BrickletIO16.FUNCTION_SET_PORT_CONFIGURATION = 3
  • BrickletIO16.FUNCTION_SET_DEBOUNCE_PERIOD = 5
  • BrickletIO16.FUNCTION_SET_PORT_INTERRUPT = 7
  • BrickletIO16.FUNCTION_SET_PORT_MONOFLOP = 10
  • BrickletIO16.FUNCTION_SET_SELECTED_VALUES = 13
  • BrickletIO16.FUNCTION_SET_EDGE_COUNT_CONFIG = 15
void BrickletIO16.setResponseExpectedAll(boolean responseExpected)
Parameters:
  • responseExpected – Type: boolean

Changes the response expected flag for all setter and callback configuration functions of this device at once.

Constants

int BrickletIO16.DEVICE_IDENTIFIER

This constant is used to identify a IO-16 Bricklet.

The getIdentity() function and the IPConnection.EnumerateCallback callback of the IP Connection have a deviceIdentifier parameter to specify the Brick's or Bricklet's type.

String BrickletIO16.DEVICE_DISPLAY_NAME

This constant represents the human readable name of a IO-16 Bricklet.