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esphome/esphome/components/adc/adc_sensor.cpp
Mat931 247b2eee30 Add ADC multisampling (#6330)
2024-05-16 14:11:21 +12:00

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#include "adc_sensor.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"
#ifdef USE_ESP8266
#ifdef USE_ADC_SENSOR_VCC
#include <Esp.h>
ADC_MODE(ADC_VCC)
#else
#include <Arduino.h>
#endif
#endif
#ifdef USE_RP2040
#ifdef CYW43_USES_VSYS_PIN
#include "pico/cyw43_arch.h"
#endif
#include <hardware/adc.h>
#endif
namespace esphome {
namespace adc {
static const char *const TAG = "adc";
// 13-bit for S2, 12-bit for all other ESP32 variants
#ifdef USE_ESP32
static const adc_bits_width_t ADC_WIDTH_MAX_SOC_BITS = static_cast<adc_bits_width_t>(ADC_WIDTH_MAX - 1);
#ifndef SOC_ADC_RTC_MAX_BITWIDTH
#if USE_ESP32_VARIANT_ESP32S2
static const int32_t SOC_ADC_RTC_MAX_BITWIDTH = 13;
#else
static const int32_t SOC_ADC_RTC_MAX_BITWIDTH = 12;
#endif
#endif
static const int ADC_MAX = (1 << SOC_ADC_RTC_MAX_BITWIDTH) - 1; // 4095 (12 bit) or 8191 (13 bit)
static const int ADC_HALF = (1 << SOC_ADC_RTC_MAX_BITWIDTH) >> 1; // 2048 (12 bit) or 4096 (13 bit)
#endif
#ifdef USE_RP2040
extern "C"
#endif
void
ADCSensor::setup() {
ESP_LOGCONFIG(TAG, "Setting up ADC '%s'...", this->get_name().c_str());
#if !defined(USE_ADC_SENSOR_VCC) && !defined(USE_RP2040)
this->pin_->setup();
#endif
#ifdef USE_ESP32
if (this->channel1_ != ADC1_CHANNEL_MAX) {
adc1_config_width(ADC_WIDTH_MAX_SOC_BITS);
if (!this->autorange_) {
adc1_config_channel_atten(this->channel1_, this->attenuation_);
}
} else if (this->channel2_ != ADC2_CHANNEL_MAX) {
if (!this->autorange_) {
adc2_config_channel_atten(this->channel2_, this->attenuation_);
}
}
// load characteristics for each attenuation
for (int32_t i = 0; i <= ADC_ATTEN_DB_12_COMPAT; i++) {
auto adc_unit = this->channel1_ != ADC1_CHANNEL_MAX ? ADC_UNIT_1 : ADC_UNIT_2;
auto cal_value = esp_adc_cal_characterize(adc_unit, (adc_atten_t) i, ADC_WIDTH_MAX_SOC_BITS,
1100, // default vref
&this->cal_characteristics_[i]);
switch (cal_value) {
case ESP_ADC_CAL_VAL_EFUSE_VREF:
ESP_LOGV(TAG, "Using eFuse Vref for calibration");
break;
case ESP_ADC_CAL_VAL_EFUSE_TP:
ESP_LOGV(TAG, "Using two-point eFuse Vref for calibration");
break;
case ESP_ADC_CAL_VAL_DEFAULT_VREF:
default:
break;
}
}
#endif // USE_ESP32
#ifdef USE_RP2040
static bool initialized = false;
if (!initialized) {
adc_init();
initialized = true;
}
#endif
ESP_LOGCONFIG(TAG, "ADC '%s' setup finished!", this->get_name().c_str());
}
void ADCSensor::dump_config() {
LOG_SENSOR("", "ADC Sensor", this);
#if defined(USE_ESP8266) || defined(USE_LIBRETINY)
#ifdef USE_ADC_SENSOR_VCC
ESP_LOGCONFIG(TAG, " Pin: VCC");
#else
LOG_PIN(" Pin: ", this->pin_);
#endif
#endif // USE_ESP8266 || USE_LIBRETINY
#ifdef USE_ESP32
LOG_PIN(" Pin: ", this->pin_);
if (this->autorange_) {
ESP_LOGCONFIG(TAG, " Attenuation: auto");
} else {
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
ESP_LOGCONFIG(TAG, " Attenuation: 0db");
break;
case ADC_ATTEN_DB_2_5:
ESP_LOGCONFIG(TAG, " Attenuation: 2.5db");
break;
case ADC_ATTEN_DB_6:
ESP_LOGCONFIG(TAG, " Attenuation: 6db");
break;
case ADC_ATTEN_DB_12_COMPAT:
ESP_LOGCONFIG(TAG, " Attenuation: 12db");
break;
default: // This is to satisfy the unused ADC_ATTEN_MAX
break;
}
}
#endif // USE_ESP32
#ifdef USE_RP2040
if (this->is_temperature_) {
ESP_LOGCONFIG(TAG, " Pin: Temperature");
} else {
#ifdef USE_ADC_SENSOR_VCC
ESP_LOGCONFIG(TAG, " Pin: VCC");
#else
LOG_PIN(" Pin: ", this->pin_);
#endif // USE_ADC_SENSOR_VCC
}
#endif // USE_RP2040
ESP_LOGCONFIG(TAG, " Samples: %i", this->sample_count_);
LOG_UPDATE_INTERVAL(this);
}
float ADCSensor::get_setup_priority() const { return setup_priority::DATA; }
void ADCSensor::update() {
float value_v = this->sample();
ESP_LOGV(TAG, "'%s': Got voltage=%.4fV", this->get_name().c_str(), value_v);
this->publish_state(value_v);
}
void ADCSensor::set_sample_count(uint8_t sample_count) {
if (sample_count != 0) {
this->sample_count_ = sample_count;
}
}
#ifdef USE_ESP8266
float ADCSensor::sample() {
uint32_t raw = 0;
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
#ifdef USE_ADC_SENSOR_VCC
raw += ESP.getVcc(); // NOLINT(readability-static-accessed-through-instance)
#else
raw += analogRead(this->pin_->get_pin()); // NOLINT
#endif
}
raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
if (this->output_raw_) {
return raw;
}
return raw / 1024.0f;
}
#endif
#ifdef USE_ESP32
float ADCSensor::sample() {
if (!this->autorange_) {
uint32_t sum = 0;
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
int raw = -1;
if (this->channel1_ != ADC1_CHANNEL_MAX) {
raw = adc1_get_raw(this->channel1_);
} else if (this->channel2_ != ADC2_CHANNEL_MAX) {
adc2_get_raw(this->channel2_, ADC_WIDTH_MAX_SOC_BITS, &raw);
}
if (raw == -1) {
return NAN;
}
sum += raw;
}
sum = (sum + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
if (this->output_raw_) {
return sum;
}
uint32_t mv = esp_adc_cal_raw_to_voltage(sum, &this->cal_characteristics_[(int32_t) this->attenuation_]);
return mv / 1000.0f;
}
int raw12 = ADC_MAX, raw6 = ADC_MAX, raw2 = ADC_MAX, raw0 = ADC_MAX;
if (this->channel1_ != ADC1_CHANNEL_MAX) {
adc1_config_channel_atten(this->channel1_, ADC_ATTEN_DB_12_COMPAT);
raw12 = adc1_get_raw(this->channel1_);
if (raw12 < ADC_MAX) {
adc1_config_channel_atten(this->channel1_, ADC_ATTEN_DB_6);
raw6 = adc1_get_raw(this->channel1_);
if (raw6 < ADC_MAX) {
adc1_config_channel_atten(this->channel1_, ADC_ATTEN_DB_2_5);
raw2 = adc1_get_raw(this->channel1_);
if (raw2 < ADC_MAX) {
adc1_config_channel_atten(this->channel1_, ADC_ATTEN_DB_0);
raw0 = adc1_get_raw(this->channel1_);
}
}
}
} else if (this->channel2_ != ADC2_CHANNEL_MAX) {
adc2_config_channel_atten(this->channel2_, ADC_ATTEN_DB_12_COMPAT);
adc2_get_raw(this->channel2_, ADC_WIDTH_MAX_SOC_BITS, &raw12);
if (raw12 < ADC_MAX) {
adc2_config_channel_atten(this->channel2_, ADC_ATTEN_DB_6);
adc2_get_raw(this->channel2_, ADC_WIDTH_MAX_SOC_BITS, &raw6);
if (raw6 < ADC_MAX) {
adc2_config_channel_atten(this->channel2_, ADC_ATTEN_DB_2_5);
adc2_get_raw(this->channel2_, ADC_WIDTH_MAX_SOC_BITS, &raw2);
if (raw2 < ADC_MAX) {
adc2_config_channel_atten(this->channel2_, ADC_ATTEN_DB_0);
adc2_get_raw(this->channel2_, ADC_WIDTH_MAX_SOC_BITS, &raw0);
}
}
}
}
if (raw0 == -1 || raw2 == -1 || raw6 == -1 || raw12 == -1) {
return NAN;
}
uint32_t mv12 = esp_adc_cal_raw_to_voltage(raw12, &this->cal_characteristics_[(int32_t) ADC_ATTEN_DB_12_COMPAT]);
uint32_t mv6 = esp_adc_cal_raw_to_voltage(raw6, &this->cal_characteristics_[(int32_t) ADC_ATTEN_DB_6]);
uint32_t mv2 = esp_adc_cal_raw_to_voltage(raw2, &this->cal_characteristics_[(int32_t) ADC_ATTEN_DB_2_5]);
uint32_t mv0 = esp_adc_cal_raw_to_voltage(raw0, &this->cal_characteristics_[(int32_t) ADC_ATTEN_DB_0]);
// Contribution of each value, in range 0-2048 (12 bit ADC) or 0-4096 (13 bit ADC)
uint32_t c12 = std::min(raw12, ADC_HALF);
uint32_t c6 = ADC_HALF - std::abs(raw6 - ADC_HALF);
uint32_t c2 = ADC_HALF - std::abs(raw2 - ADC_HALF);
uint32_t c0 = std::min(ADC_MAX - raw0, ADC_HALF);
// max theoretical csum value is 4096*4 = 16384
uint32_t csum = c12 + c6 + c2 + c0;
// each mv is max 3900; so max value is 3900*4096*4, fits in unsigned32
uint32_t mv_scaled = (mv12 * c12) + (mv6 * c6) + (mv2 * c2) + (mv0 * c0);
return mv_scaled / (float) (csum * 1000U);
}
#endif // USE_ESP32
#ifdef USE_RP2040
float ADCSensor::sample() {
if (this->is_temperature_) {
adc_set_temp_sensor_enabled(true);
delay(1);
adc_select_input(4);
uint32_t raw = 0;
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
raw += adc_read();
}
raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
adc_set_temp_sensor_enabled(false);
if (this->output_raw_) {
return raw;
}
return raw * 3.3f / 4096.0f;
} else {
uint8_t pin = this->pin_->get_pin();
#ifdef CYW43_USES_VSYS_PIN
if (pin == PICO_VSYS_PIN) {
// Measuring VSYS on Raspberry Pico W needs to be wrapped with
// `cyw43_thread_enter()`/`cyw43_thread_exit()` as discussed in
// https://github.com/raspberrypi/pico-sdk/issues/1222, since Wifi chip and
// VSYS ADC both share GPIO29
cyw43_thread_enter();
}
#endif // CYW43_USES_VSYS_PIN
adc_gpio_init(pin);
adc_select_input(pin - 26);
uint32_t raw = 0;
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
raw += adc_read();
}
raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
#ifdef CYW43_USES_VSYS_PIN
if (pin == PICO_VSYS_PIN) {
cyw43_thread_exit();
}
#endif // CYW43_USES_VSYS_PIN
if (this->output_raw_) {
return raw;
}
float coeff = pin == PICO_VSYS_PIN ? 3.0 : 1.0;
return raw * 3.3f / 4096.0f * coeff;
}
}
#endif
#ifdef USE_LIBRETINY
float ADCSensor::sample() {
uint32_t raw = 0;
if (this->output_raw_) {
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
raw += analogRead(this->pin_->get_pin()); // NOLINT
}
raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
return raw;
}
for (uint8_t sample = 0; sample < this->sample_count_; sample++) {
raw += analogReadVoltage(this->pin_->get_pin()); // NOLINT
}
raw = (raw + (this->sample_count_ >> 1)) / this->sample_count_; // NOLINT(clang-analyzer-core.DivideZero)
return raw / 1000.0f;
}
#endif // USE_LIBRETINY
#ifdef USE_ESP8266
std::string ADCSensor::unique_id() { return get_mac_address() + "-adc"; }
#endif
} // namespace adc
} // namespace esphome
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