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[ESP32] ADC auto-range setting (#2541)

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This commit is contained in:
Carlos Garcia Saura 2021-10-20 19:44:51 +02:00 committed by GitHub
parent bcc77c73e1
commit e79f7ce290
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 110 additions and 60 deletions
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160
esphome/components/adc/adc_sensor.cpp
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@ -1,5 +1,6 @@
#include "adc_sensor.h"
#include "esphome/core/log.h"
#include "esphome/core/helpers.h"
#ifdef USE_ESP8266
#ifdef USE_ADC_SENSOR_VCC
@ -16,8 +17,6 @@ namespace adc {
static const char *const TAG = "adc";
#ifdef USE_ESP32
void ADCSensor::set_attenuation(adc_atten_t attenuation) { this->attenuation_ = attenuation; }
inline adc1_channel_t gpio_to_adc1(uint8_t pin) {
#if CONFIG_IDF_TARGET_ESP32
switch (pin) {
@ -57,6 +56,8 @@ inline adc1_channel_t gpio_to_adc1(uint8_t pin) {
}
#endif
}
void ADCSensor::set_attenuation(adc_atten_t attenuation) { this->attenuation_ = attenuation; }
void ADCSensor::set_autorange(bool autorange) { this->autorange_ = autorange; }
#endif
void ADCSensor::setup() {
@ -66,6 +67,8 @@ void ADCSensor::setup() {
#endif
#ifdef USE_ESP32
if (this->autorange_)
this->attenuation_ = ADC_ATTEN_DB_11;
adc1_config_channel_atten(gpio_to_adc1(pin_->get_pin()), attenuation_);
adc1_config_width(ADC_WIDTH_BIT_12);
#if !CONFIG_IDF_TARGET_ESP32C3 && !CONFIG_IDF_TARGET_ESP32H2
@ -84,22 +87,25 @@ void ADCSensor::dump_config() {
#endif
#ifdef USE_ESP32
LOG_PIN(" Pin: ", pin_);
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
ESP_LOGCONFIG(TAG, " Attenuation: 0db (max 1.1V)");
break;
case ADC_ATTEN_DB_2_5:
ESP_LOGCONFIG(TAG, " Attenuation: 2.5db (max 1.5V)");
break;
case ADC_ATTEN_DB_6:
ESP_LOGCONFIG(TAG, " Attenuation: 6db (max 2.2V)");
break;
case ADC_ATTEN_DB_11:
ESP_LOGCONFIG(TAG, " Attenuation: 11db (max 3.9V)");
break;
default: // This is to satisfy the unused ADC_ATTEN_MAX
break;
}
if (autorange_)
ESP_LOGCONFIG(TAG, " Attenuation: auto");
else
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
ESP_LOGCONFIG(TAG, " Attenuation: 0db (max 1.1V)");
break;
case ADC_ATTEN_DB_2_5:
ESP_LOGCONFIG(TAG, " Attenuation: 2.5db (max 1.5V)");
break;
case ADC_ATTEN_DB_6:
ESP_LOGCONFIG(TAG, " Attenuation: 6db (max 2.2V)");
break;
case ADC_ATTEN_DB_11:
ESP_LOGCONFIG(TAG, " Attenuation: 11db (max 3.9V)");
break;
default: // This is to satisfy the unused ADC_ATTEN_MAX
break;
}
#endif
LOG_UPDATE_INTERVAL(this);
}
@ -109,56 +115,92 @@ void ADCSensor::update() {
ESP_LOGD(TAG, "'%s': Got voltage=%.2fV", this->get_name().c_str(), value_v);
this->publish_state(value_v);
}
float ADCSensor::sample() {
uint16_t ADCSensor::read_raw_() {
#ifdef USE_ESP32
int raw = adc1_get_raw(gpio_to_adc1(pin_->get_pin()));
float value_v = raw / 4095.0f;
#if CONFIG_IDF_TARGET_ESP32
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
value_v *= 1.1;
break;
case ADC_ATTEN_DB_2_5:
value_v *= 1.5;
break;
case ADC_ATTEN_DB_6:
value_v *= 2.2;
break;
case ADC_ATTEN_DB_11:
value_v *= 3.9;
break;
default: // This is to satisfy the unused ADC_ATTEN_MAX
break;
}
#elif CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32H2
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
value_v *= 0.84;
break;
case ADC_ATTEN_DB_2_5:
value_v *= 1.13;
break;
case ADC_ATTEN_DB_6:
value_v *= 1.56;
break;
case ADC_ATTEN_DB_11:
value_v *= 3.0;
break;
default: // This is to satisfy the unused ADC_ATTEN_MAX
break;
}
#endif
return value_v;
return adc1_get_raw(gpio_to_adc1(pin_->get_pin()));
#endif
#ifdef USE_ESP8266
#ifdef USE_ADC_SENSOR_VCC
return ESP.getVcc() / 1024.0f; // NOLINT(readability-static-accessed-through-instance)
return ESP.getVcc(); // NOLINT(readability-static-accessed-through-instance)
#else
return analogRead(this->pin_->get_pin()) / 1024.0f; // NOLINT
return analogRead(this->pin_->get_pin()); // NOLINT
#endif
#endif
}
uint32_t ADCSensor::raw_to_microvolts_(uint16_t raw) {
#ifdef USE_ESP32
#if CONFIG_IDF_TARGET_ESP32
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
return raw * 269; // 1e6 * 1.1 / 4095
case ADC_ATTEN_DB_2_5:
return raw * 366; // 1e6 * 1.5 / 4095
case ADC_ATTEN_DB_6:
return raw * 537; // 1e6 * 2.2 / 4095
case ADC_ATTEN_DB_11:
return raw * 952; // 1e6 * 3.9 / 4095
default: // This is to satisfy the unused ADC_ATTEN_MAX
return raw * 244; // 1e6 * 1.0 / 4095
}
#elif CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32H2
switch (this->attenuation_) {
case ADC_ATTEN_DB_0:
return raw * 205; // 1e6 * 0.84 / 4095
case ADC_ATTEN_DB_2_5:
return raw * 276; // 1e6 * 1.13 / 4095
case ADC_ATTEN_DB_6:
return raw * 381; // 1e6 * 1.56 / 4095
case ADC_ATTEN_DB_11:
return raw * 733; // 1e6 * 3.0 / 4095
default: // This is to satisfy the unused ADC_ATTEN_MAX
return raw * 244; // 1e6 * 1.0 / 4095
}
#endif
#endif
#ifdef USE_ESP8266
return raw * 977; // 1e6 / 1024
#endif
}
float ADCSensor::sample() {
int raw = this->read_raw_();
uint32_t v = this->raw_to_microvolts_(raw);
#ifdef USE_ESP32
if (autorange_) {
int raw11 = raw, raw6 = 4095, raw2 = 4095, raw0 = 4095;
uint32_t v11 = v, v6 = 0, v2 = 0, v0 = 0;
if (raw11 < 4095) { // Progressively read all attenuation ranges
adc1_config_channel_atten(gpio_to_adc1(pin_->get_pin()), ADC_ATTEN_DB_6);
raw6 = this->read_raw_();
v6 = this->raw_to_microvolts_(raw6);
if (raw6 < 4095) {
adc1_config_channel_atten(gpio_to_adc1(pin_->get_pin()), ADC_ATTEN_DB_2_5);
raw2 = this->read_raw_();
v2 = this->raw_to_microvolts_(raw2);
if (raw2 < 4095) {
adc1_config_channel_atten(gpio_to_adc1(pin_->get_pin()), ADC_ATTEN_DB_0);
raw0 = this->read_raw_();
v0 = this->raw_to_microvolts_(raw0);
}
}
adc1_config_channel_atten(gpio_to_adc1(pin_->get_pin()), ADC_ATTEN_DB_11);
} // Contribution coefficients (normalized to 2048)
uint16_t c11 = clamp(raw11, 0, 2048); // high 1, middle 1, low 0
uint16_t c6 = (2048 - abs(raw6 - 2048)); // high 0, middle 1, low 0
uint16_t c2 = (2048 - abs(raw2 - 2048)); // high 0, middle 1, low 0
uint16_t c0 = clamp(4095 - raw0, 0, 2048); // high 0, middle 1, low 1
uint32_t csum = c11 + c6 + c2 + c0; // sum to normalize the final result
if (csum > 0)
v = (v11 * c11) + (v6 * c6) + (v2 * c2) + (v0 * c0);
else // in case of error, this keeps the 11db output (v)
csum = 1;
csum *= 1e6; // include the 1e6 microvolts->volts conversion factor
return (float) v / (float) csum; // normalize, convert & return
}
#endif
return v / (float) 1e6; // convert from microvolts to volts
}
#ifdef USE_ESP8266
std::string ADCSensor::unique_id() { return get_mac_address() + "-adc"; }
#endif

4
esphome/components/adc/adc_sensor.h
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@ -18,6 +18,7 @@ class ADCSensor : public sensor::Sensor, public PollingComponent, public voltage
#ifdef USE_ESP32
/// Set the attenuation for this pin. Only available on the ESP32.
void set_attenuation(adc_atten_t attenuation);
void set_autorange(bool autorange);
#endif
/// Update adc values.
@ -36,9 +37,12 @@ class ADCSensor : public sensor::Sensor, public PollingComponent, public voltage
protected:
InternalGPIOPin *pin_;
uint16_t read_raw_();
uint32_t raw_to_microvolts_(uint16_t raw);
#ifdef USE_ESP32
adc_atten_t attenuation_{ADC_ATTEN_DB_0};
bool autorange_{false};
#endif
};

6
esphome/components/adc/sensor.py
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@ -21,6 +21,7 @@ ATTENUATION_MODES = {
"2.5db": cg.global_ns.ADC_ATTEN_DB_2_5,
"6db": cg.global_ns.ADC_ATTEN_DB_6,
"11db": cg.global_ns.ADC_ATTEN_DB_11,
"auto": "auto",
}
@ -92,4 +93,7 @@ async def to_code(config):
cg.add(var.set_pin(pin))
if CONF_ATTENUATION in config:
cg.add(var.set_attenuation(config[CONF_ATTENUATION]))
if config[CONF_ATTENUATION] == "auto":
cg.add(var.set_autorange(cg.global_ns.true))
else:
cg.add(var.set_attenuation(config[CONF_ATTENUATION]))