add serial text sensor

serial/text_sensor/__init__.py

@@ -0,0 +1,25 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome import automation
+from esphome.components import uart
+from esphome.components import text_sensor
+from esphome.const import CONF_ID, CONF_STATE
+
+DEPENDENCIES = ['uart']
+
+serial_ns = cg.esphome_ns.namespace('serial')
+
+SerialTextSensor = serial_ns.class_('SerialTextSensor', cg.Component,
+                                    text_sensor.TextSensor, uart.UARTDevice)
+
+CONFIG_SCHEMA = text_sensor.TEXT_SENSOR_SCHEMA.extend({
+    cv.GenerateID(): cv.declare_id(SerialTextSensor),
+}).extend(uart.UART_DEVICE_SCHEMA)
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield text_sensor.register_text_sensor(var, config)
+    yield uart.register_uart_device(var, config)
+

serial/text_sensor/serial_text_sensor.cpp

@@ -0,0 +1,32 @@
+#include "serial_text_sensor.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace serial {
+
+static const char *TAG = "serial.text_sensor";
+
+void SerialTextSensor::loop() {
+  while (this->available()) {
+    uint8_t c;
+    this->read_byte(&c);
+    this->handle_char_(c);
+  }
+}
+
+void SerialTextSensor::handle_char_(uint8_t c) {
+  if (c == '\r')
+    return;
+  if (c == '\n') {
+    std::string s(this->rx_message_.begin(), this->rx_message_.end());
+    this->publish_state(s);
+    this->rx_message_.clear();
+    return;
+  }
+  this->rx_message_.push_back(c);
+}
+
+void SerialTextSensor::dump_config() { LOG_TEXT_SENSOR("", "Serial Sensor", this); }
+
+}  // namespace serial
+}  // namespace esphome

serial/text_sensor/serial_text_sensor.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/text_sensor/text_sensor.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace serial {
+
+class SerialTextSensor : public Component,  public text_sensor::TextSensor, public uart::UARTDevice {
+ public:
+  float get_setup_priority() const override { return setup_priority::LATE; }
+  void loop() override;
+  void dump_config() override;
+
+ protected:
+  void handle_char_(uint8_t c);
+  std::vector<uint8_t> rx_message_;
+};
+
+}  // namespace serial
+}  // namespace esphome