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