54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
#ifdef HAS_BATTERY_PROBE
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#include "globals.h"
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// Local logging tag
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static const char TAG[] = "main";
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static void print_char_val_type(esp_adc_cal_value_t val_type) {
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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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}
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uint16_t read_voltage(void) {
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static const adc1_channel_t 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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// configure ADC1
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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(channel, atten));
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// calibrate ADC1
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esp_adc_cal_characteristics_t *adc_chars =
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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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esp_adc_cal_value_t val_type = esp_adc_cal_characterize(
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unit, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);
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print_char_val_type(val_type);
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// multisample ADC1
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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(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_chars);
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#ifdef BATT_FACTOR
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voltage *= BATT_FACTOR;
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#endif
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ESP_LOGI(TAG, "Raw: %d / Voltage: %dmV", adc_reading, voltage);
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return voltage;
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}
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#endif // HAS_BATTERY_PROBE
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