Add I2CMultiplexer in generel and the TCA9548A in special (#1410)

* Added I2CMultiplexer in generel and the TCA9548A in special * cleanup * tidy * tidy * tidy * tidy * Update CODEOWNERS * Update CODEOWNERS * added CODEOWNERS * Fix CODEOWNERS * protected function * fixed scan * fixed style * added to test1.yaml * Update esphome/components/tca9548a/__init__.py * Update esphome/components/i2c/__init__.py Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com> * Update esphome/components/i2c/i2c.cpp Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com> * Update esphome/components/i2c/__init__.py * Update esphome/components/i2c/__init__.py Co-authored-by: Guillermo Ruffino <glm.net@gmail.com> * Update esphome/components/i2c/i2c.cpp Co-authored-by: Guillermo Ruffino <glm.net@gmail.com> * added define statements for I2C Multiplexer * fix * try to tidy * bug fix * tidy * override fix * only change channel if different * tidy * added test * testfix * added defines * tidy * fix dep * like recommended Co-authored-by: Andreas Hergert <andreas.hergert@otrs.com> Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com> Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
2026-06-01 10:38:27 +02:00 · 2021-03-29 21:50:30 +02:00
parent ad76312f66
commit 9e23987db8
8 changed files with 178 additions and 3 deletions
@@ -0,0 +1,30 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+from esphome.components import i2c
+from esphome.const import CONF_ID, CONF_SCAN
+
+CODEOWNERS = ["@andreashergert1984"]
+
+DEPENDENCIES = ["i2c"]
+
+tca9548a_ns = cg.esphome_ns.namespace("tca9548a")
+TCA9548AComponent = tca9548a_ns.class_(
+    "TCA9548AComponent", cg.PollingComponent, i2c.I2CMultiplexer
+)
+
+MULTI_CONF = True
+
+CONFIG_SCHEMA = cv.Schema(
+    {
+        cv.GenerateID(): cv.declare_id(TCA9548AComponent),
+        cv.Optional(CONF_SCAN, default=True): cv.boolean,
+    }
+).extend(i2c.i2c_device_schema(0x70))
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    cg.add_define("USE_I2C_MULTIPLEXER")
+    yield cg.register_component(var, config)
+    yield i2c.register_i2c_device(var, config)
+    cg.add(var.set_scan(config[CONF_SCAN]))
@@ -0,0 +1,41 @@
+#include "tca9548a.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace tca9548a {
+
+static const char *TAG = "tca9548a";
+
+void TCA9548AComponent::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up TCA9548A...");
+  uint8_t status = 0;
+  if (!this->read_byte(0x00, &status)) {
+    ESP_LOGI(TAG, "TCA9548A failed");
+    return;
+  }
+  // out of range to make sure on first set_channel a new one will be set
+  this->current_channelno_ = 8;
+  ESP_LOGCONFIG(TAG, "Channels currently open: %d", status);
+}
+void TCA9548AComponent::dump_config() {
+  ESP_LOGCONFIG(TAG, "TCA9548A:");
+  LOG_I2C_DEVICE(this);
+  if (this->scan_) {
+    for (uint8_t i = 0; i < 8; i++) {
+      ESP_LOGCONFIG(TAG, "Activating channel: %d", i);
+      this->set_channel(i);
+      this->parent_->dump_config();
+    }
+  }
+}
+
+void TCA9548AComponent::set_channel(uint8_t channelno) {
+  if (this->current_channelno_ != channelno) {
+    this->current_channelno_ = channelno;
+    uint8_t channelbyte = 1 << channelno;
+    this->write_byte(0x70, channelbyte);
+  }
+}
+
+}  // namespace tca9548a
+}  // namespace esphome
@@ -0,0 +1,22 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/i2c/i2c.h"
+
+namespace esphome {
+namespace tca9548a {
+
+class TCA9548AComponent : public Component, public i2c::I2CMultiplexer {
+ public:
+  void set_scan(bool scan) { scan_ = scan; }
+  void setup() override;
+  void dump_config() override;
+  void update();
+  void set_channel(uint8_t channelno) override;
+
+ protected:
+  bool scan_;
+  uint8_t current_channelno_;
+};
+}  // namespace tca9548a
+}  // namespace esphome