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Add backlight handling for lcd_pcf8574 (#573)

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* Add backlight handling for lcd_pcf8574

Switch the backlight on or off by calling id(mydisplay).backlight()
or id(mydisplay).no_backlight() in lamda functions (assuming mydisplay
is the custom id for the LCD).

* Use abstract method


Co-authored-by: Attila Darazs <attila@darazs.com>
Co-authored-by: Otto Winter <otto@otto-winter.com>
This commit is contained in:
Attila Darazs
2019-06-03 19:36:00 +02:00
committed by Otto Winter
parent ebe64e24f1
commit 30a542e763
8 changed files with 45 additions and 16 deletions
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8
esphome/components/lcd_pcf8574/display.py
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@@ -1,7 +1,7 @@
import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import lcd_base, i2c
from esphome.const import CONF_ID
from esphome.const import CONF_ID, CONF_LAMBDA
DEPENDENCIES = ['i2c']
AUTO_LOAD = ['lcd_base']
@@ -18,3 +18,9 @@ def to_code(config):
var = cg.new_Pvariable(config[CONF_ID])
yield lcd_base.setup_lcd_display(var, config)
yield i2c.register_i2c_device(var, config)
if CONF_LAMBDA in config:
lambda_ = yield cg.process_lambda(config[CONF_LAMBDA],
[(PCF8574LCDDisplay.operator('ref'), 'it')],
return_type=cg.void)
cg.add(var.set_writer(lambda_))