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[adc] Fix ESP32-C2 ADC calibration to use line fitting (#13756)

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Jonathan Swoboda
2026-02-04 06:44:17 -05:00
committed by GitHub
parent 5dc8bfe95e
commit ba18a8b3e3
3 changed files with 51 additions and 25 deletions
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44
esphome/components/adc/adc_sensor_esp32.cpp
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@@ -74,10 +74,9 @@ void ADCSensor::setup() {
if (this->calibration_handle_ == nullptr) {
adc_cali_handle_t handle = nullptr;
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
// RISC-V variants and S3 use curve fitting calibration
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
// RISC-V variants (except C2) and S3 use curve fitting calibration
adc_cali_curve_fitting_config_t cali_config = {}; // Zero initialize first
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 3, 0)
cali_config.chan = this->channel_;
@@ -95,14 +94,14 @@ void ADCSensor::setup() {
ESP_LOGW(TAG, "Curve fitting calibration failed with error %d, will use uncalibrated readings", err);
this->setup_flags_.calibration_complete = false;
}
#else // Other ESP32 variants use line fitting calibration
#else // ESP32, ESP32-S2, and ESP32-C2 use line fitting calibration
adc_cali_line_fitting_config_t cali_config = {
.unit_id = this->adc_unit_,
.atten = this->attenuation_,
.bitwidth = ADC_BITWIDTH_DEFAULT,
#if !defined(USE_ESP32_VARIANT_ESP32S2)
#if !defined(USE_ESP32_VARIANT_ESP32S2) && !defined(USE_ESP32_VARIANT_ESP32C2)
.default_vref = 1100, // Default reference voltage in mV
#endif // !defined(USE_ESP32_VARIANT_ESP32S2)
#endif // !defined(USE_ESP32_VARIANT_ESP32S2) && !defined(USE_ESP32_VARIANT_ESP32C2)
};
err = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
if (err == ESP_OK) {
@@ -113,7 +112,7 @@ void ADCSensor::setup() {
ESP_LOGW(TAG, "Line fitting calibration failed with error %d, will use uncalibrated readings", err);
this->setup_flags_.calibration_complete = false;
}
#endif // USE_ESP32_VARIANT_ESP32C2 || ESP32C3 || ESP32C5 || ESP32C6 || ESP32C61 || ESP32H2 || ESP32P4 || ESP32S3
#endif // ESP32C3 || ESP32C5 || ESP32C6 || ESP32C61 || ESP32H2 || ESP32P4 || ESP32S3
}
this->setup_flags_.init_complete = true;
@@ -185,13 +184,12 @@ float ADCSensor::sample_fixed_attenuation_() {
} else {
ESP_LOGW(TAG, "ADC calibration conversion failed with error %d, disabling calibration", err);
if (this->calibration_handle_ != nullptr) {
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
adc_cali_delete_scheme_curve_fitting(this->calibration_handle_);
#else // Other ESP32 variants use line fitting calibration
adc_cali_delete_scheme_line_fitting(this->calibration_handle_);
#endif // USE_ESP32_VARIANT_ESP32C2 || ESP32C3 || ESP32C5 || ESP32C6 || ESP32C61 || ESP32H2 || ESP32P4 || ESP32S3
#endif // ESP32C3 || ESP32C5 || ESP32C6 || ESP32C61 || ESP32H2 || ESP32P4 || ESP32S3
this->calibration_handle_ = nullptr;
}
}
@@ -219,9 +217,8 @@ float ADCSensor::sample_autorange_() {
// Need to recalibrate for the new attenuation
if (this->calibration_handle_ != nullptr) {
// Delete old calibration handle
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
adc_cali_delete_scheme_curve_fitting(this->calibration_handle_);
#else
adc_cali_delete_scheme_line_fitting(this->calibration_handle_);
@@ -232,9 +229,8 @@ float ADCSensor::sample_autorange_() {
// Create new calibration handle for this attenuation
adc_cali_handle_t handle = nullptr;
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
adc_cali_curve_fitting_config_t cali_config = {};
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 3, 0)
cali_config.chan = this->channel_;
@@ -251,7 +247,7 @@ float ADCSensor::sample_autorange_() {
.unit_id = this->adc_unit_,
.atten = atten,
.bitwidth = ADC_BITWIDTH_DEFAULT,
#if !defined(USE_ESP32_VARIANT_ESP32S2)
#if !defined(USE_ESP32_VARIANT_ESP32S2) && !defined(USE_ESP32_VARIANT_ESP32C2)
.default_vref = 1100,
#endif
};
@@ -268,9 +264,8 @@ float ADCSensor::sample_autorange_() {
if (err != ESP_OK) {
ESP_LOGW(TAG, "ADC read failed in autorange with error %d", err);
if (handle != nullptr) {
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
adc_cali_delete_scheme_curve_fitting(handle);
#else
adc_cali_delete_scheme_line_fitting(handle);
@@ -291,9 +286,8 @@ float ADCSensor::sample_autorange_() {
ESP_LOGVV(TAG, "Autorange atten=%d: UNCALIBRATED FALLBACK - raw=%d -> %.6fV (3.3V ref)", atten, raw, voltage);
}
// Clean up calibration handle
#if USE_ESP32_VARIANT_ESP32C2 || USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || \
USE_ESP32_VARIANT_ESP32C6 || USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || \
USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
#if USE_ESP32_VARIANT_ESP32C3 || USE_ESP32_VARIANT_ESP32C5 || USE_ESP32_VARIANT_ESP32C6 || \
USE_ESP32_VARIANT_ESP32C61 || USE_ESP32_VARIANT_ESP32H2 || USE_ESP32_VARIANT_ESP32P4 || USE_ESP32_VARIANT_ESP32S3
adc_cali_delete_scheme_curve_fitting(handle);
#else
adc_cali_delete_scheme_line_fitting(handle);

12
tests/components/adc/test.esp32-c2-idf.yaml Normal file
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@@ -0,0 +1,12 @@
sensor:
- id: my_sensor
platform: adc
pin: GPIO1
name: ADC Test sensor
update_interval: "1:01"
attenuation: 2.5db
unit_of_measurement: "°C"
icon: "mdi:water-percent"
accuracy_decimals: 5
setup_priority: -100
force_update: true

20
tests/test_build_components/build_components_base.esp32-c2-idf.yaml Normal file
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@@ -0,0 +1,20 @@
esphome:
name: componenttestesp32c2idf
friendly_name: $component_name
esp32:
board: esp32-c2-devkitm-1
framework:
type: esp-idf
# Use custom partition table with larger app partition (3MB)
# Default IDF partitions only allow 1.75MB which is too small for grouped tests
partitions: ../partitions_testing.csv
logger:
level: VERY_VERBOSE
packages:
component_under_test: !include
file: $component_test_file
vars:
component_test_file: $component_test_file