DAC7678 support (#3441)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

CODEOWNERS

@@ -52,6 +52,7 @@ esphome/components/cs5460a/* @balrog-kun
 esphome/components/cse7761/* @berfenger
 esphome/components/ct_clamp/* @jesserockz
 esphome/components/current_based/* @djwmarcx
+esphome/components/dac7678/* @NickB1
 esphome/components/daly_bms/* @s1lvi0
 esphome/components/dashboard_import/* @esphome/core
 esphome/components/debug/* @OttoWinter

esphome/components/dac7678/__init__.py

@@ -0,0 +1,32 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c
+from esphome.const import CONF_ID
+
+AUTO_LOAD = ["output"]
+CODEOWNERS = ["@NickB1"]
+DEPENDENCIES = ["i2c"]
+MULTI_CONF = True
+
+dac7678_ns = cg.esphome_ns.namespace("dac7678")
+DAC7678Output = dac7678_ns.class_("DAC7678Output", cg.Component, i2c.I2CDevice)
+CONF_INTERNAL_REFERENCE = "internal_reference"
+
+CONFIG_SCHEMA = (
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.declare_id(DAC7678Output),
+            cv.Optional(CONF_INTERNAL_REFERENCE, default=False): cv.boolean,
+        }
+    )
+    .extend(cv.COMPONENT_SCHEMA)
+    .extend(i2c.i2c_device_schema(0x48))
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    cg.add(var.set_internal_reference(config[CONF_INTERNAL_REFERENCE]))
+    await i2c.register_i2c_device(var, config)
+    return var

esphome/components/dac7678/dac7678_output.cpp

@@ -0,0 +1,83 @@
+#include "dac7678_output.h"
+#include "esphome/core/log.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/hal.h"
+
+namespace esphome {
+namespace dac7678 {
+
+static const char *const TAG = "dac7678";
+
+static const uint8_t DAC7678_REG_INPUT_N = 0x00;
+static const uint8_t DAC7678_REG_SELECT_UPDATE_N = 0x10;
+static const uint8_t DAC7678_REG_WRITE_N_UPDATE_ALL = 0x20;
+static const uint8_t DAC7678_REG_WRITE_N_UPDATE_N = 0x30;
+static const uint8_t DAC7678_REG_POWER = 0x40;
+static const uint8_t DAC7678_REG_CLEAR_CODE = 0x50;
+static const uint8_t DAC7678_REG_LDAC = 0x60;
+static const uint8_t DAC7678_REG_SOFTWARE_RESET = 0x70;
+static const uint8_t DAC7678_REG_INTERNAL_REF_0 = 0x80;
+static const uint8_t DAC7678_REG_INTERNAL_REF_1 = 0x90;
+
+void DAC7678Output::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up DAC7678OutputComponent...");
+
+  ESP_LOGV(TAG, "Resetting device...");
+
+  // Reset device
+  if (!this->write_byte_16(DAC7678_REG_SOFTWARE_RESET, 0x0000)) {
+    ESP_LOGE(TAG, "Reset failed");
+    this->mark_failed();
+    return;
+  } else
+    ESP_LOGV(TAG, "Reset succeeded");
+
+  delayMicroseconds(1000);
+
+  // Set internal reference
+  if (this->internal_reference_) {
+    if (!this->write_byte_16(DAC7678_REG_INTERNAL_REF_0, 1 << 4)) {
+      ESP_LOGE(TAG, "Set internal reference failed");
+      this->mark_failed();
+      return;
+    } else
+      ESP_LOGV(TAG, "Internal reference enabled");
+  }
+}
+
+void DAC7678Output::dump_config() {
+  if (this->is_failed()) {
+    ESP_LOGE(TAG, "Setting up DAC7678 failed!");
+  } else
+    ESP_LOGCONFIG(TAG, "DAC7678 initialised");
+}
+
+void DAC7678Output::register_channel(DAC7678Channel *channel) {
+  auto c = channel->channel_;
+  this->min_channel_ = std::min(this->min_channel_, c);
+  this->max_channel_ = std::max(this->max_channel_, c);
+  channel->set_parent(this);
+  ESP_LOGV(TAG, "Registered channel: %01u", channel->channel_);
+}
+
+void DAC7678Output::set_channel_value_(uint8_t channel, uint16_t value) {
+  if (this->dac_input_reg_[channel] != value) {
+    ESP_LOGV(TAG, "Channel %01u: input_reg=%04u ", channel, value);
+
+    if (!this->write_byte_16(DAC7678_REG_WRITE_N_UPDATE_N | channel, value << 4)) {
+      this->status_set_warning();
+      return;
+    }
+  }
+  this->dac_input_reg_[channel] = value;
+  this->status_clear_warning();
+}
+
+void DAC7678Channel::write_state(float state) {
+  const float input_rounded = roundf(state * this->full_scale_);
+  auto input = static_cast<uint16_t>(input_rounded);
+  this->parent_->set_channel_value_(this->channel_, input);
+}
+
+}  // namespace dac7678
+}  // namespace esphome

esphome/components/dac7678/dac7678_output.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/core/helpers.h"
+#include "esphome/components/output/float_output.h"
+#include "esphome/components/i2c/i2c.h"
+
+namespace esphome {
+namespace dac7678 {
+
+class DAC7678Output;
+
+class DAC7678Channel : public output::FloatOutput, public Parented<DAC7678Output> {
+ public:
+  void set_channel(uint8_t channel) { channel_ = channel; }
+
+ protected:
+  friend class DAC7678Output;
+
+  const uint16_t full_scale_ = 0xFFF;
+
+  void write_state(float state) override;
+
+  uint8_t channel_;
+};
+
+/// DAC7678 float output component.
+class DAC7678Output : public Component, public i2c::I2CDevice {
+ public:
+  DAC7678Output() {}
+
+  void register_channel(DAC7678Channel *channel);
+
+  void set_internal_reference(const bool value) { this->internal_reference_ = value; }
+
+  void setup() override;
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+
+ protected:
+  friend DAC7678Channel;
+
+  bool internal_reference_;
+
+  void set_channel_value_(uint8_t channel, uint16_t value);
+
+  uint8_t min_channel_{0xFF};
+  uint8_t max_channel_{0x00};
+  uint16_t dac_input_reg_[8] = {
+      0,
+  };
+};
+
+}  // namespace dac7678
+}  // namespace esphome

esphome/components/dac7678/output.py

@@ -0,0 +1,27 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import output
+from esphome.const import CONF_CHANNEL, CONF_ID
+from . import DAC7678Output, dac7678_ns
+
+DEPENDENCIES = ["dac7678"]
+
+DAC7678Channel = dac7678_ns.class_("DAC7678Channel", output.FloatOutput)
+CONF_DAC7678_ID = "dac7678_id"
+
+CONFIG_SCHEMA = output.FLOAT_OUTPUT_SCHEMA.extend(
+    {
+        cv.Required(CONF_ID): cv.declare_id(DAC7678Channel),
+        cv.GenerateID(CONF_DAC7678_ID): cv.use_id(DAC7678Output),
+        cv.Required(CONF_CHANNEL): cv.int_range(min=0, max=7),
+    }
+)
+
+
+async def to_code(config):
+    paren = await cg.get_variable(config[CONF_DAC7678_ID])
+    var = cg.new_Pvariable(config[CONF_ID])
+    cg.add(var.set_channel(config[CONF_CHANNEL]))
+    cg.add(paren.register_channel(var))
+    await output.register_output(var, config)
+    return var

tests/test4.yaml

@@ -80,6 +80,11 @@ sx1509:
 mcp3204:
   cs_pin: GPIO23
 
+dac7678:
+    address: 0x4A
+    id: dac7678_hub1
+    internal_reference: true
+
 sensor:
   - platform: homeassistant
     entity_id: sensor.hello_world
@@ -518,6 +523,38 @@ output:
     pipsolar_id: inverter0
     battery_recharge_voltage:
       id: inverter0_battery_recharge_voltage_out
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 0
+    id: 'dac7678_1_ch0'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 1
+    id: 'dac7678_1_ch1'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 2
+    id: 'dac7678_1_ch2'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 3
+    id: 'dac7678_1_ch3'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 4
+    id: 'dac7678_1_ch4'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 5
+    id: 'dac7678_1_ch5'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 6
+    id: 'dac7678_1_ch6'
+  - platform: dac7678
+    dac7678_id: 'dac7678_hub1'
+    channel: 7
+    id: 'dac7678_1_ch7'
 esp32_camera:
   name: ESP-32 Camera
   data_pins: [GPIO17, GPIO35, GPIO34, GPIO5, GPIO39, GPIO18, GPIO36, GPIO19]