NAME

Device::Chip::BV4243 - chip driver for a BV4243

SYNOPSIS

 use Device::Chip::BV4243;

 my $chip = Device::Chip::BV4243->new;
 $chip->mount( Device::Chip::Adapter::...->new )->get;

 $chip->lcd_reset->get;
 $chip->lcd_string( "Hello, world!" )->get;

DESCRIPTION

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.

METHODS

The following methods documented with a trailing call to ->get return Future instances.

clear_keys

   $chip->clear_keys->get

Clears the keypad buffer.

get_keycount

   $count = $chip->get_keycount->get

Returns the number of keys waiting in the keypad buffer.

get_key

   $key = $chip->get_key->get

Returns the next key from the keypad buffer, or 0 if there are none.

find_key

   $pos = $chip->find_key( $key )->get

Returns the position in the key buffer of the given key, or 0 if is not there.

get_scancode

   $code = $chip->get_scancode->get

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.

beep

   $chip->beep( $msec )->get

Turns on the BELL output line for the specified number of miliseconds.

read_chan

   @channels = $chip->read_chan->get

Returns the raw touchpad sensor values as 8 16bit integers.

read_delta

   @deltas = $chip->read_delta->get

Returns the touchpad sensor values minus the trigger value.

sleep

   $chip->sleep->get

Puts the device into sleep mode. It stops scanning the keypad, but will still respond to another command which will wake it up again.

lcd_reset

   $chip->lcd_reset->get

Resets the LCD.

lcd_command

   $chip->lcd_command( $cmd )->get;

Sends a numeric command to the LCD controller.

lcd_data

   $chip->lcd_data( $data )->get

Sends a byte of numerical data to the LCD controller.

lcd_string

   $chip->lcd_string( $str )->get

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".

lcd_signon

   $chip->lcd_signon->get

Displays the signon string stored the in EEPROM.

lcd_backlight

   $chip->lcd_backlight( $red, $green, $blue )->get

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.

reset

   $chip->reset

Resets the device.

device_id

   $id = $chip->device_id->get

Returns the device ID value as a 16 bit integer

version

   $id = $chip->version->get

Returns the device firmware version as a 16 bit integer

eeprom_reset

   $chip->eeprom_reset->get

Resets the configuration EEPROM back to default values.

eeprom_read

   $val = $chip->eeprom_read( $addr )->get

Reads a byte from the configuration EEPROM.

eeprom_write

   $chip->eeprom_write( $addr, $val )->get

Writes a byte to the configuration EEPROM.

SEE ALSO

http://www.pichips.co.uk/index.php/BV4243

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>