text: import voluptuous as vol
  
  import esphomeyaml.config_validation as cv
  from esphomeyaml import pins
  from esphomeyaml.components import display, spi
  from esphomeyaml.components.spi import SPIComponent
  from esphomeyaml.const import CONF_BUSY_PIN, CONF_CS_PIN, CONF_DC_PIN, CONF_FULL_UPDATE_EVERY, \
      CONF_ID, CONF_LAMBDA, CONF_MODEL, CONF_RESET_PIN, CONF_SPI_ID
  from esphomeyaml.cpp_generator import get_variable, Pvariable, process_lambda, add
  from esphomeyaml.cpp_helpers import gpio_output_pin_expression, gpio_input_pin_expression, \
      setup_component
  from esphomeyaml.cpp_types import PollingComponent, App
  
  DEPENDENCIES = ['spi']
  
  WaveshareEPaperTypeA = display.display_ns.WaveshareEPaperTypeA
  WaveshareEPaper = display.display_ns.class_('WaveshareEPaper',
                                              PollingComponent, spi.SPIDevice, display.DisplayBuffer)
  
  
  WaveshareEPaperTypeAModel = display.display_ns.enum('WaveshareEPaperTypeAModel')
  WaveshareEPaperTypeBModel = display.display_ns.enum('WaveshareEPaperTypeBModel')
  
  MODELS = {
      '1.54in': ('a', WaveshareEPaperTypeAModel.WAVESHARE_EPAPER_1_54_IN),
      '2.13in': ('a', WaveshareEPaperTypeAModel.WAVESHARE_EPAPER_2_13_IN),
      '2.90in': ('a', WaveshareEPaperTypeAModel.WAVESHARE_EPAPER_2_9_IN),
      '2.70in': ('b', WaveshareEPaperTypeBModel.WAVESHARE_EPAPER_2_7_IN),
      '4.20in': ('b', WaveshareEPaperTypeBModel.WAVESHARE_EPAPER_4_2_IN),
      '7.50in': ('b', WaveshareEPaperTypeBModel.WAVESHARE_EPAPER_7_5_IN),
  }
  
  
  def validate_full_update_every_only_type_a(value):
      if CONF_FULL_UPDATE_EVERY not in value:
          return value
      if MODELS[value[CONF_MODEL]][0] != 'a':
          raise vol.Invalid("The 'full_update_every' option is only available for models "
                            "'1.54in', '2.13in' and '2.90in'.")
      return value
  
  
  PLATFORM_SCHEMA = vol.All(display.FULL_DISPLAY_PLATFORM_SCHEMA.extend({
      cv.GenerateID(): cv.declare_variable_id(WaveshareEPaper),
      cv.GenerateID(CONF_SPI_ID): cv.use_variable_id(SPIComponent),
      vol.Required(CONF_CS_PIN): pins.gpio_output_pin_schema,
      vol.Required(CONF_DC_PIN): pins.gpio_output_pin_schema,
      vol.Required(CONF_MODEL): cv.one_of(*MODELS, lower=True),
      vol.Optional(CONF_RESET_PIN): pins.gpio_output_pin_schema,
      vol.Optional(CONF_BUSY_PIN): pins.gpio_input_pin_schema,
      vol.Optional(CONF_FULL_UPDATE_EVERY): cv.uint32_t,
  }).extend(cv.COMPONENT_SCHEMA.schema), validate_full_update_every_only_type_a)
  
  
  def to_code(config):
      for spi_ in get_variable(config[CONF_SPI_ID]):
          yield
      for cs in gpio_output_pin_expression(config[CONF_CS_PIN]):
          yield
      for dc in gpio_output_pin_expression(config[CONF_DC_PIN]):
          yield
  
      model_type, model = MODELS[config[CONF_MODEL]]
      if model_type == 'a':
          rhs = App.make_waveshare_epaper_type_a(spi_, cs, dc, model)
          epaper = Pvariable(config[CONF_ID], rhs, type=WaveshareEPaperTypeA)
      elif model_type == 'b':
          rhs = App.make_waveshare_epaper_type_b(spi_, cs, dc, model)
          epaper = Pvariable(config[CONF_ID], rhs, type=WaveshareEPaper)
      else:
          raise NotImplementedError()
  
      if CONF_LAMBDA in config:
          for lambda_ in process_lambda(config[CONF_LAMBDA], [(display.DisplayBufferRef, 'it')]):
              yield
          add(epaper.set_writer(lambda_))
      if CONF_RESET_PIN in config:
          for reset in gpio_output_pin_expression(config[CONF_RESET_PIN]):
              yield
          add(epaper.set_reset_pin(reset))
      if CONF_BUSY_PIN in config:
          for reset in gpio_input_pin_expression(config[CONF_BUSY_PIN]):
              yield
          add(epaper.set_busy_pin(reset))
      if CONF_FULL_UPDATE_EVERY in config:
          add(epaper.set_full_update_every(config[CONF_FULL_UPDATE_EVERY]))
  
      display.setup_display(epaper, config)
      setup_component(epaper, config)
  
  
  BUILD_FLAGS = '-DUSE_WAVESHARE_EPAPER'
  