Device::Chip::BV4243 - chip driver for a BV4243
my $chip = Device::Chip::BV4243->new;
await $chip->mount( Device::Chip::Adapter::...->new );
await $chip->lcd_string( "Hello, world!" );
This Device::Chip subclass provides specific communication to a ByVac BV4243 LCD/touchpad display module attached to a computer via an I²C adapter.
The reader is presumed to be familiar with the general operation of this module; the documention here will not attempt to explain or define module-specific concpets or features, only the use of this module to access them.
The following methods documented in an await expression return Future instances.
Clears the keypad buffer.
$count = await $chip->get_keycount;
Returns the number of keys waiting in the keypad buffer.
$key = await $chip->get_key;
Returns the next key from the keypad buffer, or 0 if there are none.
$pos = await $chip->find_key( $key );
Returns the position in the key buffer of the given key, or 0 if is not there.
$code = await $chip->get_scancode;
Returns the scan value from the keypad scanning matrix. This will be 0 if no key is being touched, or an integer value with at least two bits set if a key is being held.
await $chip->beep( $msec );
Turns on the BELL output line for the specified number of miliseconds.
@channels = await $chip->read_chan;
Returns the raw touchpad sensor values as 8 16bit integers.
@deltas = await $chip->read_delta;
Returns the touchpad sensor values minus the trigger value.
Puts the device into sleep mode. It stops scanning the keypad, but will still respond to another command which will wake it up again.
Resets the LCD.
await $chip->lcd_command( $cmd );
Sends a numeric command to the LCD controller.
await $chip->lcd_data( $data );
Sends a byte of numerical data to the LCD controller.
await $chip->lcd_string( $str );
Sends a string of data to the LCD controller. This is a more efficient version of sending each byte of the string individually using "lcd_data".
Displays the signon string stored the in EEPROM.
await $chip->lcd_backlight( $red, $green, $blue );
Sets the level of each of the three backlight channels. Each must be a numeric value between 0 and 10 (inclusive). For single-backlight displays, use the $red channel.
Resets the device.
$id = await $chip->device_id;
Returns the device ID value as a 16 bit integer
$id = await $chip->version;
Returns the device firmware version as a 16 bit integer
Resets the configuration EEPROM back to default values.
$val = await $chip->eeprom_read( $addr );
Reads a byte from the configuration EEPROM.
await $chip->eeprom_write( $addr, $val );
Writes a byte to the configuration EEPROM.
Paul Evans <email@example.com>
To install Device::Chip::BV4243, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.