NAME

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

SYNOPSIS

      use Device::Chip::BV4243;
      use Future::AsyncAwait;

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

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

DESCRIPTION

   This Device::Chip subclass provides specific communication to a ByVac
   BV4243 LCD/touchpad display module attached to a computer via an I�C
   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 in an await expression return Future
   instances.

clear_keys

      await $chip->clear_keys;

   Clears the keypad buffer.

get_keycount

      $count = await $chip->get_keycount;

   Returns the number of keys waiting in the keypad buffer.

get_key

      $key = await $chip->get_key;

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

find_key

      $pos = await $chip->find_key( $key );

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

get_scancode

      $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.

beep

      await $chip->beep( $msec );

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

read_chan

      @channels = await $chip->read_chan;

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

read_delta

      @deltas = await $chip->read_delta;

   Returns the touchpad sensor values minus the trigger value.

sleep

      await $chip->sleep;

   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

      await $chip->lcd_reset;

   Resets the LCD.

lcd_command

      await $chip->lcd_command( $cmd );

   Sends a numeric command to the LCD controller.

lcd_data

      await $chip->lcd_data( $data );

   Sends a byte of numerical data to the LCD controller.

lcd_string

      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".

lcd_signon

      await $chip->lcd_signon;

   Displays the signon string stored the in EEPROM.

lcd_backlight

      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.

reset

      $chip->reset

   Resets the device.

device_id

      $id = await $chip->device_id;

   Returns the device ID value as a 16 bit integer

version

      $id = await $chip->version;

   Returns the device firmware version as a 16 bit integer

eeprom_reset

      await $chip->eeprom_reset;

   Resets the configuration EEPROM back to default values.

eeprom_read

      $val = await $chip->eeprom_read( $addr );

   Reads a byte from the configuration EEPROM.

eeprom_write

      await $chip->eeprom_write( $addr, $val );

   Writes a byte to the configuration EEPROM.

SEE ALSO

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

AUTHOR

   Paul Evans <[email protected]>

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