Perl - OLED 64x48 Bricklet¶

Hello World¶

Download (example_hello_world.pl)

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#!/usr/bin/perl

use strict;
use Tinkerforge::IPConnection;
use Tinkerforge::BrickletOLED64x48;

use constant HOST => 'localhost';
use constant PORT => 4223;
use constant UID => 'XYZ'; # Change XYZ to the UID of your OLED 64x48 Bricklet

my $ipcon = Tinkerforge::IPConnection->new(); # Create IP connection
my $oled = Tinkerforge::BrickletOLED64x48->new(&UID, $ipcon); # Create device object

$ipcon->connect(&HOST, &PORT); # Connect to brickd
# Don't use device before ipcon is connected

# Clear display
$oled->clear_display();

# Write "Hello World" starting from upper left corner of the screen
$oled->write_line(0, 0, "Hello World");

print "Press key to exit\n";
<STDIN>;
$ipcon->disconnect();

Pixel Matrix¶

Download (example_pixel_matrix.pl)

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#!/usr/bin/perl

use strict;
use Tinkerforge::IPConnection;
use Tinkerforge::BrickletOLED64x48;

use constant HOST => 'localhost';
use constant PORT => 4223;
use constant UID => 'XYZ'; # Change XYZ to the UID of your OLED 64x48 Bricklet
use constant WIDTH => 64;
use constant HEIGHT => 48;

my $ipcon = Tinkerforge::IPConnection->new(); # Create IP connection
my $oled = Tinkerforge::BrickletOLED64x48->new(&UID, $ipcon); # Create device object

sub draw_matrix
{
    my ($oled, $pixels_ref) = @_;
    my @pixels = @{$pixels_ref};
    my @pages = ();

    foreach my $row (0..&HEIGHT / 8 - 1) {
        $pages[$row] = ();

        foreach my $column (0..&WIDTH - 1) {
            $pages[$row][$column] = 0;

            foreach my $bit (0..7) {
                if ($pixels[($row * 8) + $bit][$column]) {
                    $pages[$row][$column] |= 1 << $bit;
                }
            }
        }
    }

    $oled->new_window(0, &WIDTH - 1, 0, &HEIGHT / 8 - 1);

    foreach my $row (0..&HEIGHT / 8 - 1) {
        $oled->write($pages[$row]);
    }
}

$ipcon->connect(&HOST, &PORT); # Connect to brickd
# Don't use device before ipcon is connected

# Clear display
$oled->clear_display();

# Draw checkerboard pattern
my @pixels = ();

foreach my $row (0..&HEIGHT - 1) {
    $pixels[$row] = ();

    foreach my $column (0..&WIDTH - 1) {
        $pixels[$row][$column] = (($row / 8) % 2) == (($column / 8) % 2);
    }
}

draw_matrix($oled, \@pixels);

print "Press key to exit\n";
<STDIN>;
$ipcon->disconnect();

Scribble¶

Download (example_scribble.pl)

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#!/usr/bin/perl

use strict;
use Math::Trig;
use Term::ReadKey;
use GD;
use Tinkerforge::IPConnection;
use Tinkerforge::BrickletOLED64x48;

use constant HOST => 'localhost';
use constant PORT => 4223;
use constant UID => 'XYZ'; # Change XYZ to the UID of your OLED 64x48 Bricklet
use constant WIDTH => 64;
use constant HEIGHT => 48;

my $ipcon = Tinkerforge::IPConnection->new(); # Create IP connection
my $oled = Tinkerforge::BrickletOLED64x48->new(&UID, $ipcon); # Create device object

sub draw_image
{
    my ($oled, $image) = @_;
    my @pages = ();

    foreach my $row (0..&HEIGHT / 8 - 1) {
        $pages[$row] = ();

        foreach my $column (0..&WIDTH - 1) {
            $pages[$row][$column] = 0;

            foreach my $bit (0..7) {
                my $index = $image->getPixel($column, ($row * 8) + $bit);
                my @rgb = $image->rgb($index);

                if ($rgb[0] > 0) {
                    $pages[$row][$column] |= 1 << $bit;
                }
            }
        }
    }

    $oled->new_window(0, &WIDTH - 1, 0, &HEIGHT / 8 - 1);

    foreach my $row (0..&HEIGHT / 8 - 1) {
        $oled->write($pages[$row]);
    }
}

$ipcon->connect(&HOST, &PORT); # Connect to brickd
# Don't use device before ipcon is connected

# Clear display
$oled->clear_display();

# Draw rotating line
my $image = new GD::Image(&WIDTH, &HEIGHT);
my $black = $image->colorAllocate(0, 0, 0);
my $white = $image->colorAllocate(255, 255, 255);
my $origin_x = &WIDTH / 2;
my $origin_y = &HEIGHT / 2;
my $length = &HEIGHT / 2 - 2;
my $angle = 0;

print "Press key to exit\n";
ReadMode(4);

while (!defined(ReadKey(-1))) {
    my $radians = pi * $angle / 180.0;
    my $x = int($origin_x + $length * cos($radians));
    my $y = int($origin_y + $length * sin($radians));

    $image->filledRectangle(0, 0, &WIDTH, &HEIGHT, $black);
    $image->line($origin_x, $origin_y, $x, $y, $white);

    draw_image($oled, $image);
    sleep 0.025;

    $angle++;
}

ReadMode(0);
$ipcon->disconnect();

Basic Functions¶

BrickletOLED64x48->new($uid, $ipcon)¶

Parameters:	$uid – Type: string $ipcon – Type: IPConnection
Returns:	$oled_64x48 – Type: BrickletOLED64x48

Creates an object with the unique device ID $uid:

$oled_64x48 = BrickletOLED64x48->new("YOUR_DEVICE_UID", $ipcon);

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

BrickletOLED64x48->write(\@data)¶

Parameters:	\@data – Type: [int, ...], Length: 64, Range: [0 to 255]
Returns:	undef

Appends 64 byte of data to the window as set by new_window().

Each row has a height of 8 pixels which corresponds to one byte of data.

Example: if you call new_window() with column from 0 to 63 and row from 0 to 5 (the whole display) each call of write() (red arrow) will write one row.

The LSB (D0) of each data byte is at the top and the MSB (D7) is at the bottom of the row.

The next call of write() will write the second row and so on. To fill the whole display you need to call write() 6 times.

BrickletOLED64x48->new_window($column_from, $column_to, $row_from, $row_to)¶

Parameters:	$column_from – Type: int, Range: [0 to 63] $column_to – Type: int, Range: [0 to 63] $row_from – Type: int, Range: [0 to 5] $row_to – Type: int, Range: [0 to 5]
Returns:	undef

Sets the window in which you can write with write(). One row has a height of 8 pixels.

BrickletOLED64x48->clear_display()¶

Returns:	undef

Clears the current content of the window as set by new_window().

BrickletOLED64x48->write_line($line, $position, $text)¶

Parameters:	$line – Type: int, Range: [0 to 5] $position – Type: int, Range: [0 to 12] $text – Type: string, Length: up to 13
Returns:	undef

Writes text to a specific line with a specific position. The text can have a maximum of 13 characters.

For example: (1, 4, "Hello") will write Hello in the middle of the second line of the display.

You can draw to the display with write() and then add text to it afterwards.

The display uses a special 5x7 pixel charset. You can view the characters of the charset in Brick Viewer.

The font conforms to code page 437.

Advanced Functions¶

BrickletOLED64x48->set_display_configuration($contrast, $invert)¶

Parameters:	$contrast – Type: int, Range: [0 to 255], Default: 143 $invert – Type: bool, Default: 0
Returns:	undef

Sets the configuration of the display.

You can set a contrast value from 0 to 255 and you can invert the color (black/white) of the display.

BrickletOLED64x48->get_display_configuration()¶

Return Array:	0: $contrast – Type: int, Range: [0 to 255], Default: 143 1: $invert – Type: bool, Default: 0

Returns the configuration as set by set_display_configuration().

BrickletOLED64x48->get_identity()¶

Return Array:

0: $uid – Type: string, Length: up to 8 1: $connected_uid – Type: string, Length: up to 8 2: $position – Type: char, Range: ['a' to 'h', 'z'] 3: \@hardware_version – Type: [int, ...], Length: 3 0: $major – Type: int, Range: [0 to 255] 1: $minor – Type: int, Range: [0 to 255] 2: $revision – Type: int, Range: [0 to 255] 4: \@firmware_version – Type: [int, ...], Length: 3 0: $major – Type: int, Range: [0 to 255] 1: $minor – Type: int, Range: [0 to 255] 2: $revision – Type: int, Range: [0 to 255] 5: $device_identifier – 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.

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.

BrickletOLED64x48->get_api_version()¶

Return Array:	0: \@api_version – Type: [int, ...], Length: 3 0: $major – Type: int, Range: [0 to 255] 1: $minor – Type: int, Range: [0 to 255] 2: $revision – Type: int, 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.

BrickletOLED64x48->get_response_expected($function_id)¶

Parameters:	$function_id – Type: int, Range: See constants
Returns:	$response_expected – Type: bool

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 set_response_expected(). 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 $function_id:

• BrickletOLED64x48->FUNCTION_WRITE = 1
• BrickletOLED64x48->FUNCTION_NEW_WINDOW = 2
• BrickletOLED64x48->FUNCTION_CLEAR_DISPLAY = 3
• BrickletOLED64x48->FUNCTION_SET_DISPLAY_CONFIGURATION = 4
• BrickletOLED64x48->FUNCTION_WRITE_LINE = 6

BrickletOLED64x48->set_response_expected($function_id, $response_expected)¶

Parameters:	$function_id – Type: int, Range: See constants $response_expected – Type: bool
Returns:	undef

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 $function_id:

• BrickletOLED64x48->FUNCTION_WRITE = 1
• BrickletOLED64x48->FUNCTION_NEW_WINDOW = 2
• BrickletOLED64x48->FUNCTION_CLEAR_DISPLAY = 3
• BrickletOLED64x48->FUNCTION_SET_DISPLAY_CONFIGURATION = 4
• BrickletOLED64x48->FUNCTION_WRITE_LINE = 6

BrickletOLED64x48->set_response_expected_all($response_expected)¶

Parameters:	$response_expected – Type: bool
Returns:	undef

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

Constants¶

BrickletOLED64x48->DEVICE_IDENTIFIER¶

This constant is used to identify a OLED 64x48 Bricklet.

The get_identity() function and the IPConnection->CALLBACK_ENUMERATE callback of the IP Connection have a device_identifier parameter to specify the Brick's or Bricklet's type.

BrickletOLED64x48->DEVICE_DISPLAY_NAME¶

This constant represents the human readable name of a OLED 64x48 Bricklet.