Add uart.write action (#567)

* Add uart.write action

* Lint

esphome/components/uart/__init__.py

@@ -1,15 +1,27 @@
 import esphome.codegen as cg
 import esphome.config_validation as cv
-from esphome import pins
-from esphome.const import CONF_BAUD_RATE, CONF_ID, CONF_RX_PIN, CONF_TX_PIN, CONF_UART_ID
+from esphome import pins, automation
+from esphome.const import CONF_BAUD_RATE, CONF_ID, CONF_RX_PIN, CONF_TX_PIN, CONF_UART_ID, CONF_DATA
 from esphome.core import CORE, coroutine
+from esphome.py_compat import text_type, binary_type, char_to_byte
 
 uart_ns = cg.esphome_ns.namespace('uart')
 UARTComponent = uart_ns.class_('UARTComponent', cg.Component)
 UARTDevice = uart_ns.class_('UARTDevice')
+UARTWriteAction = uart_ns.class_('UARTWriteAction', automation.Action)
 MULTI_CONF = True
 
 
+def validate_raw_data(value):
+    if isinstance(value, text_type):
+        return value.encode('utf-8')
+    if isinstance(value, str):
+        return value
+    if isinstance(value, list):
+        return cv.Schema([cv.hex_uint8_t])(value)
+    raise cv.Invalid("data must either be a string wrapped in quotes or a list of bytes")
+
+
 def validate_rx_pin(value):
     value = pins.input_pin(value)
     if CORE.is_esp8266 and value >= 16:
@@ -51,3 +63,22 @@ def register_uart_device(var, config):
     """
     parent = yield cg.get_variable(config[CONF_UART_ID])
     cg.add(var.set_uart_parent(parent))
+
+
+@automation.register_action('uart.write', UARTWriteAction, cv.maybe_simple_value({
+    cv.GenerateID(): cv.use_id(UARTComponent),
+    cv.Required(CONF_DATA): cv.templatable(validate_raw_data),
+}, key=CONF_DATA))
+def uart_write_to_code(config, action_id, template_arg, args):
+    var = cg.new_Pvariable(action_id, template_arg)
+    yield cg.register_parented(var, config[CONF_ID])
+    data = config[CONF_DATA]
+    if isinstance(data, binary_type):
+        data = [char_to_byte(x) for x in data]
+
+    if cg.is_template(data):
+        templ = yield cg.templatable(data, args, cg.std_vector.template(cg.uint8))
+        cg.add(var.set_data_template(templ))
+    else:
+        cg.add(var.set_data_static(data))
+    yield var

esphome/components/uart/automation.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "uart.h"
+#include "esphome/core/automation.h"
+
+namespace esphome {
+namespace uart {
+
+template<typename... Ts> class UARTWriteAction : public Action<Ts...>, public Parented<UARTComponent> {
+ public:
+  void set_data_template(std::function<std::vector<uint8_t>(Ts...)> func) {
+    this->data_func_ = func;
+    this->static_ = false;
+  }
+  void set_data_static(const std::vector<uint8_t> &data) {
+    this->data_static_ = data;
+    this->static_ = true;
+  }
+
+  void play(Ts... x) override {
+    if (this->static_) {
+      this->parent_->write_array(this->data_static_);
+    } else {
+      auto val = this->data_func_(x...);
+      this->parent_->write_array(val);
+    }
+  }
+
+ protected:
+  bool static_{false};
+  std::function<std::vector<uint8_t>(Ts...)> data_func_{};
+  std::vector<uint8_t> data_static_{};
+};
+
+}  // namespace uart
+}  // namespace esphome

esphome/components/uart/switch/__init__.py

@@ -3,27 +3,17 @@ import esphome.config_validation as cv
 from esphome.components import switch, uart
 from esphome.const import CONF_DATA, CONF_ID, CONF_INVERTED
 from esphome.core import HexInt
-from esphome.py_compat import text_type, binary_type, char_to_byte
-from .. import uart_ns
+from esphome.py_compat import binary_type, char_to_byte
+from .. import uart_ns, validate_raw_data
 
 DEPENDENCIES = ['uart']
 
 UARTSwitch = uart_ns.class_('UARTSwitch', switch.Switch, uart.UARTDevice, cg.Component)
 
 
-def validate_data(value):
-    if isinstance(value, text_type):
-        return value.encode('utf-8')
-    if isinstance(value, str):
-        return value
-    if isinstance(value, list):
-        return cv.Schema([cv.hex_uint8_t])(value)
-    raise cv.Invalid("data must either be a string wrapped in quotes or a list of bytes")
-
-
 CONFIG_SCHEMA = switch.SWITCH_SCHEMA.extend({
     cv.GenerateID(): cv.declare_id(UARTSwitch),
-    cv.Required(CONF_DATA): validate_data,
+    cv.Required(CONF_DATA): validate_raw_data,
     cv.Optional(CONF_INVERTED): cv.invalid("UART switches do not support inverted mode!"),
 }).extend(uart.UART_DEVICE_SCHEMA).extend(cv.COMPONENT_SCHEMA)
 

esphome/components/uart/uart.h

@@ -49,6 +49,7 @@ class UARTComponent : public Component, public Stream {
   void write_byte(uint8_t data);
 
   void write_array(const uint8_t *data, size_t len);
+  void write_array(const std::vector<uint8_t> &data) { this->write_array(&data[0], data.size()); }
 
   void write_str(const char *str);
 
@@ -97,6 +98,7 @@ class UARTDevice : public Stream {
   void write_byte(uint8_t data) { this->parent_->write_byte(data); }
 
   void write_array(const uint8_t *data, size_t len) { this->parent_->write_array(data, len); }
+  void write_array(const std::vector<uint8_t> &data) { this->parent_->write_array(data); }
 
   void write_str(const char *str) { this->parent_->write_str(str); }
 

esphome/config_validation.py

@@ -1210,13 +1210,14 @@ def validate_registry(name, registry):
     return ensure_list(validate_registry_entry(name, registry))
 
 
-def maybe_simple_value(*validators):
+def maybe_simple_value(*validators, **kwargs):
+    key = kwargs.pop('key', CONF_VALUE)
     validator = All(*validators)
 
     def validate(value):
-        if isinstance(value, dict) and CONF_VALUE in value:
+        if isinstance(value, dict) and key in value:
             return validator(value)
-        return validator({CONF_VALUE: value})
+        return validator({key: value})
 
     return validate
 

tests/test1.yaml

@@ -103,6 +103,12 @@ mqtt:
         - light.control:
             id: living_room_lights
             brightness: !lambda 'return id(living_room_lights).current_values.get_brightness() + 0.5;'
+        - uart.write:
+            id: uart0
+            data: Hello World
+        - uart.write: [0x00, 0x20, 0x30]
+        - uart.write: !lambda |-
+            return {};
 
 i2c:
   sda: 21
@@ -120,6 +126,7 @@ uart:
   tx_pin: GPIO22
   rx_pin: GPIO23
   baud_rate: 115200
+  id: uart0
 
 ota:
   safe_mode: True