64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
#include "globals.h"
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// Local logging tag
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static const char TAG[] = "main";
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esp_adc_cal_characteristics_t *adc_characs =
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(esp_adc_cal_characteristics_t *)calloc(
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1, sizeof(esp_adc_cal_characteristics_t));
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static const adc1_channel_t adc_channel = HAS_BATTERY_PROBE;
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static const adc_atten_t atten = ADC_ATTEN_DB_11;
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static const adc_unit_t unit = ADC_UNIT_1;
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void calibrate_voltage(void) {
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#ifdef HAS_BATTERY_PROBE
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// configure ADC
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ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_12));
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ESP_ERROR_CHECK(adc1_config_channel_atten(adc_channel, atten));
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// calibrate ADC
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esp_adc_cal_value_t val_type = esp_adc_cal_characterize(
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unit, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_characs);
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// show ADC characterization base
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if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) {
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ESP_LOGI(TAG,
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"ADC characterization based on Two Point values stored in eFuse");
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} else if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) {
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ESP_LOGI(TAG,
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"ADC characterization based on reference voltage stored in eFuse");
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} else {
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ESP_LOGI(TAG, "ADC characterization based on default reference voltage");
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}
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#endif
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}
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uint16_t read_voltage() {
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#ifdef HAS_BATTERY_PROBE
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// multisample ADC
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uint32_t adc_reading = 0;
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for (int i = 0; i < NO_OF_SAMPLES; i++) {
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adc_reading += adc1_get_raw(adc_channel);
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}
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adc_reading /= NO_OF_SAMPLES;
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// Convert ADC reading to voltage in mV
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uint16_t voltage =
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(uint16_t)esp_adc_cal_raw_to_voltage(adc_reading, adc_characs);
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#ifdef BATT_FACTOR
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voltage *= BATT_FACTOR;
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#endif
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ESP_LOGD(TAG, "Raw: %d / Voltage: %dmV", adc_reading, voltage);
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return voltage;
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#else
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return 0;
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#endif
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}
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bool batt_sufficient() {
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#ifdef HAS_BATTERY_PROBE
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uint16_t volts = read_voltage();
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return ((volts < 1000) ||
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(volts > OTA_MIN_BATT)); // no battery or battery sufficient
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#else
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return true;
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#endif
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} |