ESP32 HAL - Dynamic ADC attenuation (#14623)
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@ -67,7 +67,9 @@ uint16_t HAL_adc_result;
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// Private Variables
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// Private Variables
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// ------------------------
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// ------------------------
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esp_adc_cal_characteristics_t characteristics;
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esp_adc_cal_characteristics_t characteristics[ADC_ATTEN_MAX];
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adc_atten_t attenuations[ADC1_CHANNEL_MAX] = {};
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uint32_t thresholds[ADC_ATTEN_MAX];
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volatile int numPWMUsed = 0,
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volatile int numPWMUsed = 0,
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pwmPins[MAX_PWM_PINS],
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pwmPins[MAX_PWM_PINS],
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pwmValues[MAX_PWM_PINS];
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pwmValues[MAX_PWM_PINS];
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@ -129,49 +131,74 @@ adc1_channel_t get_channel(int pin) {
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return ADC1_CHANNEL_MAX;
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return ADC1_CHANNEL_MAX;
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}
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}
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void adc1_set_attenuation(adc1_channel_t chan, adc_atten_t atten) {
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if (attenuations[chan] != atten) {
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adc1_config_channel_atten(chan, atten);
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attenuations[chan] = atten;
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}
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}
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void HAL_adc_init() {
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void HAL_adc_init() {
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// Configure ADC
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// Configure ADC
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adc1_config_width(ADC_WIDTH_12Bit);
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adc1_config_width(ADC_WIDTH_12Bit);
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// Configure channels only if used as (re-)configuring a pin for ADC that is used elsewhere might have adverse effects
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// Configure channels only if used as (re-)configuring a pin for ADC that is used elsewhere might have adverse effects
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#if HAS_TEMP_ADC_0
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#if HAS_TEMP_ADC_0
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adc1_config_channel_atten(get_channel(TEMP_0_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_0_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_ADC_1
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#if HAS_TEMP_ADC_1
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adc1_config_channel_atten(get_channel(TEMP_1_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_1_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_ADC_2
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#if HAS_TEMP_ADC_2
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adc1_config_channel_atten(get_channel(TEMP_2_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_2_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_ADC_3
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#if HAS_TEMP_ADC_3
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adc1_config_channel_atten(get_channel(TEMP_3_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_3_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_ADC_4
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#if HAS_TEMP_ADC_4
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adc1_config_channel_atten(get_channel(TEMP_4_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_4_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_ADC_5
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#if HAS_TEMP_ADC_5
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adc1_config_channel_atten(get_channel(TEMP_5_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_5_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_HEATED_BED
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#if HAS_HEATED_BED
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adc1_config_channel_atten(get_channel(TEMP_BED_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_BED_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if HAS_TEMP_CHAMBER
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#if HAS_TEMP_CHAMBER
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adc1_config_channel_atten(get_channel(TEMP_CHAMBER_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(TEMP_CHAMBER_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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#if ENABLED(FILAMENT_WIDTH_SENSOR)
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#if ENABLED(FILAMENT_WIDTH_SENSOR)
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adc1_config_channel_atten(get_channel(FILWIDTH_PIN), ADC_ATTEN_11db);
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adc1_set_attenuation(get_channel(FILWIDTH_PIN), ADC_ATTEN_11db);
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#endif
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#endif
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// Note that adc2 is shared with the WiFi module, which has higher priority, so the conversion may fail.
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// Note that adc2 is shared with the WiFi module, which has higher priority, so the conversion may fail.
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// That's why we're not setting it up here.
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// That's why we're not setting it up here.
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// Calculate ADC characteristics i.e. gain and offset factors
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// Calculate ADC characteristics (i.e., gain and offset factors for each attenuation level)
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esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, V_REF, &characteristics);
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for (int i = 0; i < ADC_ATTEN_MAX; i++) {
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esp_adc_cal_characterize(ADC_UNIT_1, (adc_atten_t)i, ADC_WIDTH_BIT_12, V_REF, &characteristics[i]);
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// Change attenuation 100mV below the calibrated threshold
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thresholds[i] = esp_adc_cal_raw_to_voltage(4095, &characteristics[i]);
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}
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}
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}
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void HAL_adc_start_conversion(uint8_t adc_pin) {
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void HAL_adc_start_conversion(uint8_t adc_pin) {
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const adc1_channel_t chan = get_channel(adc_pin);
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uint32_t mv;
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uint32_t mv;
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esp_adc_cal_get_voltage((adc_channel_t)get_channel(adc_pin), &characteristics, &mv);
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esp_adc_cal_get_voltage((adc_channel_t)chan, &characteristics[attenuations[chan]], &mv);
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// Change the attenuation level based on the new reading
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adc_atten_t atten;
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if (mv < thresholds[ADC_ATTEN_DB_0] - 100)
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adc1_set_attenuation(chan, ADC_ATTEN_DB_0);
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else if (mv > thresholds[ADC_ATTEN_DB_0] - 50 && mv < thresholds[ADC_ATTEN_DB_2_5] - 100)
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adc1_set_attenuation(chan, ADC_ATTEN_DB_2_5);
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else if (mv > thresholds[ADC_ATTEN_DB_2_5] - 50 && mv < thresholds[ADC_ATTEN_DB_6] - 100)
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adc1_set_attenuation(chan, ADC_ATTEN_DB_6);
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else if (mv > thresholds[ADC_ATTEN_DB_6] - 50)
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adc1_set_attenuation(chan, ADC_ATTEN_DB_11);
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HAL_adc_result = mv * 1023.0 / 3300.0;
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HAL_adc_result = mv * 1023.0 / 3300.0;
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}
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}
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