add component for CardKB

Author: Samuel Sieb

components/cardkb/README.md

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+# CardKB: https://shop.m5stack.com/products/cardkb-mini-keyboard
+
+This component is for the CardKB device.  Define a `cardkb` component then add `binary_sensor`s to handle individual keys.
+If you want automatic handling for multiple keys, e.g. PIN entry, use the `key_collector` component.
+
+Example:
+```yaml
+cardkb:
+  - id: mykb  #optional
+
+binary_sensor:
+  - platform: cardkb
+    cardkb_id: mykb  #optional if only one keyboard
+    id: a_key
+    key: a
+  - platform: cardkb
+    id: enter_key
+    key: 13
+```
+

components/cardkb/__init__.py

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+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c, key_provider
+from esphome.const import CONF_ID
+
+CODEOWNERS = ["@ssieb"]
+DEPENDENCIES = ["i2c"]
+
+AUTO_LOAD = [ "key_provider" ]
+
+MULTI_CONF = True
+
+cardkb_ns = cg.esphome_ns.namespace('cardkb')
+CardKB = cardkb_ns.class_('CardKB', cg.Component, i2c.I2CDevice, key_provider.KeyProvider)
+
+CONF_CARDKB_ID = 'cardkb_id'
+
+CONFIG_SCHEMA = i2c.i2c_device_schema(None).extend(
+    {
+        cv.GenerateID(): cv.declare_id(CardKB),
+    }
+)
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await i2c.register_i2c_device(var, config)

components/cardkb/binary_sensor/__init__.py

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+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import binary_sensor
+from esphome.const import CONF_ID, CONF_KEY
+from .. import CardKB, cardkb_ns, CONF_CARDKB_ID
+
+DEPENDENCIES = ['cardkb']
+
+CardKBBinarySensor = cardkb_ns.class_('CardKBBinarySensor', binary_sensor.BinarySensor)
+
+def key(value):
+    if isinstance(value, str):
+        if len(value) == 1:
+            return ord(value[0])
+    elif isinstance(value, int):
+        if value > 0 and value <= 255:
+            return value
+        raise cv.Invalid("Number must be between 1 and 255")
+    raise cv.Invalid("Must be a string with one character or a number")
+
+CONFIG_SCHEMA = binary_sensor.BINARY_SENSOR_SCHEMA.extend(
+    {
+        cv.GenerateID(): cv.declare_id(CardKBBinarySensor),
+        cv.GenerateID(CONF_CARDKB_ID): cv.use_id(CardKB),
+        cv.Required(CONF_KEY): key,
+    }
+)
+
+
+async def to_code(config):
+    key = config[CONF_KEY]
+    var = cg.new_Pvariable(config[CONF_ID], config[CONF_KEY])
+    await binary_sensor.register_binary_sensor(var, config)
+    cardkb = await cg.get_variable(config[CONF_CARDKB_ID])
+    cg.add(cardkb.register_listener(var))

components/cardkb/binary_sensor/cardkb_binary_sensor.h

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+#pragma once
+
+#include "esphome/components/cardkb/cardkb.h"
+#include "esphome/components/binary_sensor/binary_sensor.h"
+
+namespace esphome {
+namespace cardkb {
+
+class CardKBBinarySensor : public CardKBListener, public binary_sensor::BinarySensor {
+ public:
+  CardKBBinarySensor(uint8_t key) : key_(key) {};
+
+  void key_pressed(uint8_t key) override {
+    if (key == this->key_)
+      this->publish_state(true);
+  }
+
+  void key_released(uint8_t key) override {
+    if (key == this->key_)
+      this->publish_state(false);
+  }
+
+ protected:
+  uint8_t key_;
+};
+
+}  // namespace cardkb
+}  // namespace esphome

components/cardkb/cardkb.cpp

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+#include "cardkb.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace cardkb {
+
+static const char *TAG = "cardkb";
+
+void CardKB::loop() {
+  uint8_t c;
+  static uint32_t last_error = 0;
+  c = this->pressed_key_;
+  if (c) {
+    for (auto &listener : this->listeners_)
+      listener->key_released(c);
+    this->pressed_key_ = 0;
+  }
+  i2c::ErrorCode res = this->read(&c, 1);
+  if ((res != i2c::NO_ERROR) || (c == 0))
+    return;
+  if (c < 32)
+    ESP_LOGD(TAG, "keycode '%d' pressed", c);
+  else
+    ESP_LOGD(TAG, "key '%c' pressed", c);
+  for (auto &listener : this->listeners_)
+    listener->key_pressed(c);
+  this->pressed_key_ = c;
+  this->send_key_(c);
+}
+
+void CardKB::dump_config() {
+  ESP_LOGCONFIG(TAG, "CardKB:");
+}
+
+void CardKB::register_listener(CardKBListener *listener) {
+  this->listeners_.push_back(listener);
+}
+
+}  // namespace cardkb
+}  // namespace esphome
+

components/cardkb/cardkb.h

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+#pragma once
+
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/key_provider/key_provider.h"
+#include "esphome/core/component.h"
+
+namespace esphome {
+namespace cardkb {
+
+class CardKBListener {
+ public:
+  virtual void key_pressed(uint8_t key) {};
+  virtual void key_released(uint8_t key) {};
+};
+
+class CardKB : public key_provider::KeyProvider, public Component, public i2c::I2CDevice {
+ public:
+  void loop() override;
+  void dump_config() override;
+
+  void register_listener(CardKBListener *listener);
+
+ protected:
+  int pressed_key_ = -1;
+
+  std::vector<CardKBListener *> listeners_{};
+};
+
+}  // namespace cardkb
+}  // namespace esphome
+
+