Add LEDC set_frequency action (#754)

* Add LEDC set_frequency

Fixes https://github.com/esphome/feature-requests/issues/380

* Fix log

* Fixes

* Format

* Update test1.yaml

* Update test1.yaml

* Fix

esphome/components/ledc/ledc_output.cpp

@@ -11,10 +11,10 @@ namespace ledc {
 static const char *TAG = "ledc.output";
 
 void LEDCOutput::write_state(float state) {
-  if (this->pin_->is_inverted()) {
+  if (this->pin_->is_inverted())
     state = 1.0f - state;
-  }
 
+  this->duty_ = state;
   const uint32_t max_duty = (uint32_t(1) << this->bit_depth_) - 1;
   const float duty_rounded = roundf(state * max_duty);
   auto duty = static_cast<uint32_t>(duty_rounded);
@@ -22,10 +22,10 @@ void LEDCOutput::write_state(float state) {
 }
 
 void LEDCOutput::setup() {
-  ledcSetup(this->channel_, this->frequency_, this->bit_depth_);
-  ledcAttachPin(this->pin_->get_pin(), this->channel_);
-
+  this->apply_frequency(this->frequency_);
   this->turn_off();
+  // Attach pin after setting default value
+  ledcAttachPin(this->pin_->get_pin(), this->channel_);
 }
 
 void LEDCOutput::dump_config() {
@@ -33,7 +33,34 @@ void LEDCOutput::dump_config() {
   LOG_PIN("  Pin ", this->pin_);
   ESP_LOGCONFIG(TAG, "  LEDC Channel: %u", this->channel_);
   ESP_LOGCONFIG(TAG, "  Frequency: %.1f Hz", this->frequency_);
-  ESP_LOGCONFIG(TAG, "  Bit Depth: %u", this->bit_depth_);
+}
+
+float ledc_max_frequency_for_bit_depth(uint8_t bit_depth) { return 80e6f / float(1 << bit_depth); }
+float ledc_min_frequency_for_bit_depth(uint8_t bit_depth) {
+  const float max_div_num = ((1 << 20) - 1) / 256.0f;
+  return 80e6f / (max_div_num * float(1 << bit_depth));
+}
+optional<uint8_t> ledc_bit_depth_for_frequency(float frequency) {
+  for (int i = 20; i >= 1; i--) {
+    const float min_frequency = ledc_min_frequency_for_bit_depth(frequency);
+    const float max_frequency = ledc_max_frequency_for_bit_depth(frequency);
+    if (min_frequency <= frequency && frequency <= max_frequency)
+      return i;
+  }
+  return {};
+}
+
+void LEDCOutput::apply_frequency(float frequency) {
+  auto bit_depth_opt = ledc_bit_depth_for_frequency(frequency);
+  if (!bit_depth_opt.has_value()) {
+    ESP_LOGW(TAG, "Frequency %f can't be achieved with any bit depth", frequency);
+    this->status_set_warning();
+  }
+  this->bit_depth_ = *bit_depth_opt;
+  this->frequency_ = frequency;
+  ledcSetup(this->channel_, frequency, this->bit_depth_);
+  // re-apply duty
+  this->write_state(this->duty_);
 }
 
 uint8_t next_ledc_channel = 0;

esphome/components/ledc/ledc_output.h

@@ -2,6 +2,7 @@
 
 #include "esphome/core/component.h"
 #include "esphome/core/esphal.h"
+#include "esphome/core/automation.h"
 #include "esphome/components/output/float_output.h"
 
 #ifdef ARDUINO_ARCH_ESP32
@@ -16,11 +17,10 @@ class LEDCOutput : public output::FloatOutput, public Component {
   explicit LEDCOutput(GPIOPin *pin) : pin_(pin) { this->channel_ = next_ledc_channel++; }
 
   void set_channel(uint8_t channel) { this->channel_ = channel; }
-  void set_bit_depth(uint8_t bit_depth) { this->bit_depth_ = bit_depth; }
   void set_frequency(float frequency) { this->frequency_ = frequency; }
+  /// Dynamically change frequency at runtime
+  void apply_frequency(float frequency);
 
-  // ========== INTERNAL METHODS ==========
-  // (In most use cases you won't need these)
   /// Setup LEDC.
   void setup() override;
   void dump_config() override;
@@ -28,13 +28,28 @@ class LEDCOutput : public output::FloatOutput, public Component {
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
 
   /// Override FloatOutput's write_state.
-  void write_state(float adjusted_value) override;
+  void write_state(float state) override;
 
  protected:
   GPIOPin *pin_;
   uint8_t channel_{};
   uint8_t bit_depth_{};
   float frequency_{};
+  float duty_{0.0f};
+};
+
+template<typename... Ts> class SetFrequencyAction : public Action<Ts...> {
+ public:
+  SetFrequencyAction(LEDCOutput *parent) : parent_(parent) {}
+  TEMPLATABLE_VALUE(float, frequency);
+
+  void play(Ts... x) {
+    float freq = this->frequency_.value(x...);
+    this->parent_->apply_frequency(freq);
+  }
+
+ protected:
+  LEDCOutput *parent_;
 };
 
 }  // namespace ledc

esphome/components/ledc/output.py

@@ -1,6 +1,4 @@
-import math
-
-from esphome import pins
+from esphome import pins, automation
 from esphome.components import output
 import esphome.config_validation as cv
 import esphome.codegen as cg
@@ -15,53 +13,36 @@ def calc_max_frequency(bit_depth):
 
 
 def calc_min_frequency(bit_depth):
-    # LEDC_DIV_NUM_HSTIMER is 15-bit unsigned integer
-    # lower 8 bits represent fractional part
-    max_div_num = ((1 << 16) - 1) / 256.0
+    max_div_num = ((2**20) - 1) / 256.0
     return 80e6 / (max_div_num * (2**bit_depth))
 
 
-def validate_frequency_bit_depth(obj):
-    frequency = obj[CONF_FREQUENCY]
-    if CONF_BIT_DEPTH not in obj:
-        obj = obj.copy()
-        for bit_depth in range(15, 0, -1):
-            if calc_min_frequency(bit_depth) <= frequency <= calc_max_frequency(bit_depth):
-                obj[CONF_BIT_DEPTH] = bit_depth
-                break
-        else:
-            min_freq = min(calc_min_frequency(x) for x in range(1, 16))
-            max_freq = max(calc_max_frequency(x) for x in range(1, 16))
-            if frequency < min_freq:
+def validate_frequency(value):
+    value = cv.frequency(value)
+    min_freq = calc_min_frequency(20)
+    max_freq = calc_max_frequency(1)
+    if value < min_freq:
         raise cv.Invalid("This frequency setting is not possible, please choose a higher "
                          "frequency (at least {}Hz)".format(int(min_freq)))
-            if frequency > max_freq:
+    if value > max_freq:
         raise cv.Invalid("This frequency setting is not possible, please choose a lower "
                          "frequency (at most {}Hz)".format(int(max_freq)))
-            raise cv.Invalid("Invalid frequency!")
-
-    bit_depth = obj[CONF_BIT_DEPTH]
-    min_freq = calc_min_frequency(bit_depth)
-    max_freq = calc_max_frequency(bit_depth)
-    if frequency > max_freq:
-        raise cv.Invalid('Maximum frequency for bit depth {} is {}Hz. Please decrease the '
-                         'bit_depth.'.format(bit_depth, int(math.floor(max_freq))))
-    if frequency < calc_min_frequency(bit_depth):
-        raise cv.Invalid('Minimum frequency for bit depth {} is {}Hz. Please increase the '
-                         'bit_depth.'.format(bit_depth, int(math.ceil(min_freq))))
-    return obj
+    return value
 
 
 ledc_ns = cg.esphome_ns.namespace('ledc')
 LEDCOutput = ledc_ns.class_('LEDCOutput', output.FloatOutput, cg.Component)
+SetFrequencyAction = ledc_ns.class_('SetFrequencyAction', automation.Action)
 
-CONFIG_SCHEMA = cv.All(output.FLOAT_OUTPUT_SCHEMA.extend({
+CONFIG_SCHEMA = output.FLOAT_OUTPUT_SCHEMA.extend({
     cv.Required(CONF_ID): cv.declare_id(LEDCOutput),
     cv.Required(CONF_PIN): pins.internal_gpio_output_pin_schema,
     cv.Optional(CONF_FREQUENCY, default='1kHz'): cv.frequency,
-    cv.Optional(CONF_BIT_DEPTH): cv.int_range(min=1, max=15),
     cv.Optional(CONF_CHANNEL): cv.int_range(min=0, max=15),
-}).extend(cv.COMPONENT_SCHEMA), validate_frequency_bit_depth)
+
+    cv.Optional(CONF_BIT_DEPTH): cv.invalid("The bit_depth option has been removed in v1.14, the "
+                                            "best bit depth is now automatically calculated."),
+}).extend(cv.COMPONENT_SCHEMA)
 
 
 def to_code(config):
@@ -72,4 +53,15 @@ def to_code(config):
     if CONF_CHANNEL in config:
         cg.add(var.set_channel(config[CONF_CHANNEL]))
     cg.add(var.set_frequency(config[CONF_FREQUENCY]))
-    cg.add(var.set_bit_depth(config[CONF_BIT_DEPTH]))
+
+
+@automation.register_action('output.ledc.set_frequency', SetFrequencyAction, cv.Schema({
+    cv.Required(CONF_ID): cv.use_id(LEDCOutput),
+    cv.Required(CONF_FREQUENCY): cv.templatable(validate_frequency),
+}))
+def ledc_set_frequency_to_code(config, action_id, template_arg, args):
+    paren = yield cg.get_variable(config[CONF_ID])
+    var = cg.new_Pvariable(action_id, template_arg, paren)
+    template_ = yield cg.templatable(config[CONF_FREQUENCY], args, float)
+    cg.add(var.set_frequency(template_))
+    yield var

platformio.ini

@@ -29,14 +29,6 @@ build_flags =
 ; log messages
 src_filter = +<esphome>
 
-[env:livingroom32]
-platform = espressif32@1.6.0
-board = nodemcu-32s
-framework = arduino
-lib_deps = ${common.lib_deps}
-build_flags = ${common.build_flags} -DUSE_ETHERNET
-src_filter = ${common.src_filter} +<tests/livingroom32.cpp>
-
 [env:livingroom8266]
 platform = espressif8266@1.8.0
 board = nodemcuv2
@@ -47,3 +39,11 @@ lib_deps =
     Hash
 build_flags = ${common.build_flags}
 src_filter = ${common.src_filter} +<tests/livingroom8266.cpp>
+
+[env:livingroom32]
+platform = espressif32@1.6.0
+board = nodemcu-32s
+framework = arduino
+lib_deps = ${common.lib_deps}
+build_flags = ${common.build_flags} -DUSE_ETHERNET
+src_filter = ${common.src_filter} +<tests/livingroom32.cpp>

tests/test1.yaml

@@ -722,6 +722,12 @@ binary_sensor:
       - binary_sensor.template.publish:
           id: garage_door
           state: OFF
+      - output.ledc.set_frequency:
+          id: gpio_19
+          frequency: 500.0Hz
+      - output.ledc.set_frequency:
+          id: gpio_19
+          frequency: !lambda 'return 500.0;'
   - platform: pn532
     uid: 74-10-37-94
     name: "PN532 NFC Tag"
@@ -789,7 +795,6 @@ output:
     pin: 19
     id: gpio_19
     frequency: 1500Hz
-    bit_depth: 8
     channel: 14
     max_power: 0.5
   - platform: pca9685