From f962497db1c7466155b414eab9ccd1b7aae11cc9 Mon Sep 17 00:00:00 2001
From: pixelgrb <10325178+pixelgrb@users.noreply.github.com>
Date: Thu, 18 Dec 2025 20:13:36 -0800
Subject: [PATCH] [mmc5603] enable AUTO_SR_en to compensate for temperature
 drift (#12556)

Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
---
 esphome/components/mmc5603/mmc5603.cpp | 4 +++-
 esphome/components/mmc5603/mmc5603.h   | 2 ++
 esphome/components/mmc5603/sensor.py   | 5 +++++
 tests/components/mmc5603/common.yaml   | 1 +
 4 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/esphome/components/mmc5603/mmc5603.cpp b/esphome/components/mmc5603/mmc5603.cpp
index f0d1044f3f..d6321eae8f 100644
--- a/esphome/components/mmc5603/mmc5603.cpp
+++ b/esphome/components/mmc5603/mmc5603.cpp
@@ -83,6 +83,7 @@ void MMC5603Component::dump_config() {
     ESP_LOGE(TAG, "The ID registers don't match - Is this really an MMC5603?");
   }
   LOG_UPDATE_INTERVAL(this);
+  ESP_LOGCONFIG(TAG, "  Auto set/reset: %s", ONOFF(this->auto_set_reset_));
 
   LOG_SENSOR("  ", "X Axis", this->x_sensor_);
   LOG_SENSOR("  ", "Y Axis", this->y_sensor_);
@@ -93,7 +94,8 @@ void MMC5603Component::dump_config() {
 float MMC5603Component::get_setup_priority() const { return setup_priority::DATA; }
 
 void MMC5603Component::update() {
-  if (!this->write_byte(MMC56X3_CTRL0_REG, 0x01)) {
+  uint8_t ctrl0 = (this->auto_set_reset_) ? 0x21 : 0x01;
+  if (!this->write_byte(MMC56X3_CTRL0_REG, ctrl0)) {
     this->status_set_warning();
     return;
   }
diff --git a/esphome/components/mmc5603/mmc5603.h b/esphome/components/mmc5603/mmc5603.h
index cd0893053c..09718bd3b7 100644
--- a/esphome/components/mmc5603/mmc5603.h
+++ b/esphome/components/mmc5603/mmc5603.h
@@ -25,6 +25,7 @@ class MMC5603Component : public PollingComponent, public i2c::I2CDevice {
   void set_y_sensor(sensor::Sensor *y_sensor) { y_sensor_ = y_sensor; }
   void set_z_sensor(sensor::Sensor *z_sensor) { z_sensor_ = z_sensor; }
   void set_heading_sensor(sensor::Sensor *heading_sensor) { heading_sensor_ = heading_sensor; }
+  void set_auto_set_reset(bool auto_set_reset) { auto_set_reset_ = auto_set_reset; }
 
  protected:
   MMC5603Datarate datarate_;
@@ -32,6 +33,7 @@ class MMC5603Component : public PollingComponent, public i2c::I2CDevice {
   sensor::Sensor *y_sensor_{nullptr};
   sensor::Sensor *z_sensor_{nullptr};
   sensor::Sensor *heading_sensor_{nullptr};
+  bool auto_set_reset_{true};
   enum ErrorCode {
     NONE = 0,
     COMMUNICATION_FAILED,
diff --git a/esphome/components/mmc5603/sensor.py b/esphome/components/mmc5603/sensor.py
index 3223225271..5b3982cee6 100644
--- a/esphome/components/mmc5603/sensor.py
+++ b/esphome/components/mmc5603/sensor.py
@@ -16,6 +16,8 @@ from esphome.const import (
     UNIT_MICROTESLA,
 )
 
+CONF_AUTO_SET_RESET = "auto_set_reset"
+
 DEPENDENCIES = ["i2c"]
 
 mmc5603_ns = cg.esphome_ns.namespace("mmc5603")
@@ -54,6 +56,7 @@ CONFIG_SCHEMA = (
             cv.Optional(CONF_FIELD_STRENGTH_Y): field_strength_schema,
             cv.Optional(CONF_FIELD_STRENGTH_Z): field_strength_schema,
             cv.Optional(CONF_HEADING): heading_schema,
+            cv.Optional(CONF_AUTO_SET_RESET, default=True): cv.boolean,
         }
     )
     .extend(cv.polling_component_schema("60s"))
@@ -88,3 +91,5 @@ async def to_code(config):
     if CONF_HEADING in config:
         sens = await sensor.new_sensor(config[CONF_HEADING])
         cg.add(var.set_heading_sensor(sens))
+    if CONF_AUTO_SET_RESET in config:
+        cg.add(var.set_auto_set_reset(config[CONF_AUTO_SET_RESET]))
diff --git a/tests/components/mmc5603/common.yaml b/tests/components/mmc5603/common.yaml
index 6f6e35e9af..ddb5c3b25e 100644
--- a/tests/components/mmc5603/common.yaml
+++ b/tests/components/mmc5603/common.yaml
@@ -2,6 +2,7 @@ sensor:
   - platform: mmc5603
     i2c_id: i2c_bus
     address: 0x30
+    auto_set_reset: true
     field_strength_x:
       name: HMC5883L Field Strength X
     field_strength_y: