Add st7920 display, (#1440)

Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/st7920/display.py

@@ -0,0 +1,42 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import display, spi
+from esphome.const import CONF_ID, CONF_LAMBDA, CONF_WIDTH, CONF_HEIGHT
+
+AUTO_LOAD = ["display"]
+CODEOWNERS = ["@marsjan155"]
+DEPENDENCIES = ["spi"]
+
+st7920_ns = cg.esphome_ns.namespace("st7920")
+ST7920 = st7920_ns.class_(
+    "ST7920", cg.PollingComponent, display.DisplayBuffer, spi.SPIDevice
+)
+ST7920Ref = ST7920.operator("ref")
+
+CONFIG_SCHEMA = (
+    display.FULL_DISPLAY_SCHEMA.extend(
+        {
+            cv.GenerateID(): cv.declare_id(ST7920),
+            cv.Required(CONF_WIDTH): cv.int_,
+            cv.Required(CONF_HEIGHT): cv.int_,
+        }
+    )
+    .extend(cv.polling_component_schema("60s"))
+    .extend(spi.spi_device_schema())
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await spi.register_spi_device(var, config)
+
+    if CONF_LAMBDA in config:
+        lambda_ = await cg.process_lambda(
+            config[CONF_LAMBDA], [(ST7920Ref, "it")], return_type=cg.void
+        )
+        cg.add(var.set_writer(lambda_))
+    cg.add(var.set_width(config[CONF_WIDTH]))
+    cg.add(var.set_height(config[CONF_HEIGHT]))
+
+    await display.register_display(var, config)