Add support for the TLC5947 24-Channel, 12-Bit PWM LED Driver (#2066)

Co-authored-by: Richard Nauber <richard@nauber.dev>

esphome/components/tlc5947/tlc5947.h

@@ -0,0 +1,69 @@
+#pragma once
+// TLC5947 24-Channel, 12-Bit PWM LED Driver
+// https://www.ti.com/lit/ds/symlink/tlc5947.pdf
+
+#include "esphome/core/component.h"
+#include "esphome/core/esphal.h"
+#include "esphome/components/output/float_output.h"
+
+namespace esphome {
+namespace tlc5947 {
+
+class TLC5947 : public Component {
+ public:
+  class Channel;
+
+  const uint8_t N_CHANNELS_PER_CHIP = 24;
+
+  void set_data_pin(GPIOPin *data_pin) { data_pin_ = data_pin; }
+  void set_clock_pin(GPIOPin *clock_pin) { clock_pin_ = clock_pin; }
+  void set_lat_pin(GPIOPin *lat_pin) { lat_pin_ = lat_pin; }
+  void set_outenable_pin(GPIOPin *outenable_pin) { outenable_pin_ = outenable_pin; }
+  void set_num_chips(uint8_t num_chips) { num_chips_ = num_chips; }
+
+  void setup() override;
+
+  void dump_config() override;
+
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+
+  /// Send new values if they were updated.
+  void loop() override;
+
+  class Channel : public output::FloatOutput {
+   public:
+    void set_parent(TLC5947 *parent) { parent_ = parent; }
+    void set_channel(uint8_t channel) { channel_ = channel; }
+
+   protected:
+    void write_state(float state) override {
+      auto amount = static_cast<uint16_t>(state * 0xfff);
+      this->parent_->set_channel_value_(this->channel_, amount);
+    }
+
+    TLC5947 *parent_;
+    uint8_t channel_;
+  };
+
+ protected:
+  void set_channel_value_(uint16_t channel, uint16_t value) {
+    if (channel >= this->num_chips_ * N_CHANNELS_PER_CHIP)
+      return;
+    if (this->pwm_amounts_[channel] != value) {
+      this->update_ = true;
+    }
+    this->pwm_amounts_[channel] = value;
+  }
+
+  GPIOPin *data_pin_;
+  GPIOPin *clock_pin_;
+  GPIOPin *lat_pin_;
+  GPIOPin *outenable_pin_{nullptr};
+  uint8_t num_chips_;
+
+  std::vector<uint16_t> pwm_amounts_;
+  bool update_{true};
+};
+
+}  // namespace tlc5947
+}  // namespace esphome