ESP32-PaxCounter/src/power.cpp

// Basic config
#include "globals.h"
#include "power.h"

// Local logging tag
static const char TAG[] = __FILE__;

#ifdef BAT_MEASURE_ADC
esp_adc_cal_characteristics_t *adc_characs =
    (esp_adc_cal_characteristics_t *)calloc(
        1, sizeof(esp_adc_cal_characteristics_t));

#ifndef BAT_MEASURE_ADC_UNIT // ADC1
static const adc1_channel_t adc_channel = BAT_MEASURE_ADC;
#else // ADC2
static const adc2_channel_t adc_channel = BAT_MEASURE_ADC;
#endif
static const adc_atten_t atten = ADC_ATTEN_DB_11;
static const adc_unit_t unit = ADC_UNIT_1;
#endif // BAT_MEASURE_ADC

#ifdef HAS_PMU
AXP20X_Class pmu;

void AXP192_powerevent_IRQ(void) {

  pmu.readIRQ();

  if (pmu.isVbusOverVoltageIRQ())
    ESP_LOGI(TAG, "USB voltage %.2fV too high.", pmu.getVbusVoltage() / 1000);
  if (pmu.isVbusPlugInIRQ())
    ESP_LOGI(TAG, "USB plugged, %.2fV @ %.0mA", pmu.getVbusVoltage() / 1000,
             pmu.getVbusCurrent());
  if (pmu.isVbusRemoveIRQ())
    ESP_LOGI(TAG, "USB unplugged.");

  if (pmu.isBattPlugInIRQ())
    ESP_LOGI(TAG, "Battery is connected.");
  if (pmu.isBattRemoveIRQ())
    ESP_LOGI(TAG, "Battery was removed.");
  if (pmu.isChargingIRQ())
    ESP_LOGI(TAG, "Battery charging.");
  if (pmu.isChargingDoneIRQ())
    ESP_LOGI(TAG, "Battery charging done.");
  if (pmu.isBattTempLowIRQ())
    ESP_LOGI(TAG, "Battery high temperature.");
  if (pmu.isBattTempHighIRQ())
    ESP_LOGI(TAG, "Battery low temperature.");

// short press -> esp32 deep sleep mode, can be exited by pressing user button
#ifdef HAS_BUTTON
  if (pmu.isPEKShortPressIRQ() && (RTC_runmode == RUNMODE_NORMAL)) {
    enter_deepsleep(0, HAS_BUTTON);
  }
#endif

  // long press -> shutdown power, can be exited by another longpress
  if (pmu.isPEKLongtPressIRQ()) {
    AXP192_power(pmu_power_off); // switch off Lora, GPS, display
    pmu.shutdown();              // switch off device
  }

  pmu.clearIRQ();

  // refresh stored voltage value
  read_battlevel();
}

void AXP192_power(pmu_power_t powerlevel) {

  switch (powerlevel) {

  case pmu_power_off:
    pmu.setChgLEDMode(AXP20X_LED_OFF);
    pmu.setPowerOutPut(AXP192_DCDC1, AXP202_OFF);
    pmu.setPowerOutPut(AXP192_LDO3, AXP202_OFF);
    pmu.setPowerOutPut(AXP192_LDO2, AXP202_OFF);
    // pmu.setPowerOutPut(AXP192_DCDC3, AXP202_OFF);
    break;

  case pmu_power_sleep:
    pmu.setChgLEDMode(AXP20X_LED_BLINK_1HZ);
    // we don't cut off DCDC1, because then display blocks i2c bus
    pmu.setPowerOutPut(AXP192_LDO3, AXP202_OFF); // gps off
    pmu.setPowerOutPut(AXP192_LDO2, AXP202_OFF); // lora off
    break;

  default:                                       // all rails power on
    pmu.setPowerOutPut(AXP192_LDO2, AXP202_ON);  // Lora on T-Beam V1.0
    pmu.setPowerOutPut(AXP192_LDO3, AXP202_ON);  // Gps on T-Beam V1.0
    pmu.setPowerOutPut(AXP192_DCDC1, AXP202_ON); // OLED on T-Beam v1.0
    pmu.setChgLEDMode(AXP20X_LED_LOW_LEVEL);
    break;
  }
}

void AXP192_showstatus(void) {

  if (pmu.isBatteryConnect())
    if (pmu.isChargeing())
      ESP_LOGI(TAG, "Battery charging, %.2fV @ %.0fmAh",
               pmu.getBattVoltage() / 1000, pmu.getBattChargeCurrent());
    else
      ESP_LOGI(TAG, "Battery not charging");
  else
    ESP_LOGI(TAG, "No Battery");

  if (pmu.isVBUSPlug())
    ESP_LOGI(TAG, "USB powered, %.0fmW",
             pmu.getVbusVoltage() / 1000 * pmu.getVbusCurrent());
  else
    ESP_LOGI(TAG, "USB not present");
}

void AXP192_init(void) {

  if (pmu.begin(i2c_readBytes, i2c_writeBytes, AXP192_PRIMARY_ADDRESS) ==
      AXP_FAIL)
    ESP_LOGI(TAG, "AXP192 PMU initialization failed");
  else {

    // configure AXP192
    pmu.setDCDC1Voltage(3300);              // for external OLED display
    pmu.setTimeOutShutdown(false);          // no automatic shutdown
    pmu.setTSmode(AXP_TS_PIN_MODE_DISABLE); // TS pin mode off to save power

    // switch ADCs on
    pmu.adc1Enable(AXP202_BATT_VOL_ADC1, true);
    pmu.adc1Enable(AXP202_BATT_CUR_ADC1, true);
    pmu.adc1Enable(AXP202_VBUS_VOL_ADC1, true);
    pmu.adc1Enable(AXP202_VBUS_CUR_ADC1, true);

    // switch power rails on
    AXP192_power(pmu_power_on);

#ifdef PMU_INT
    pinMode(PMU_INT, INPUT_PULLUP);
    attachInterrupt(digitalPinToInterrupt(PMU_INT), PMUIRQ, FALLING);
    pmu.enableIRQ(AXP202_VBUS_REMOVED_IRQ | AXP202_VBUS_CONNECT_IRQ |
                      AXP202_BATT_REMOVED_IRQ | AXP202_BATT_CONNECT_IRQ |
                      AXP202_CHARGING_FINISHED_IRQ,
                  1);
    pmu.clearIRQ();
#endif // PMU_INT

    ESP_LOGI(TAG, "AXP192 PMU initialized");
  }
}

#endif // HAS_PMU

void calibrate_voltage(void) {
#ifdef BAT_MEASURE_ADC
// configure ADC
#ifndef BAT_MEASURE_ADC_UNIT // ADC1
  ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_12));
  ESP_ERROR_CHECK(adc1_config_channel_atten(adc_channel, atten));
#else // ADC2
      // ESP_ERROR_CHECK(adc2_config_width(ADC_WIDTH_BIT_12));
  ESP_ERROR_CHECK(adc2_config_channel_atten(adc_channel, atten));
#endif
  // 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");
  }
#endif
}

uint16_t read_voltage(void) {
  uint16_t voltage = 0;

#ifdef HAS_PMU
  voltage = pmu.getBattVoltage();
#else

#ifdef BAT_MEASURE_ADC
  // multisample ADC
  uint32_t adc_reading = 0;
#ifndef BAT_MEASURE_ADC_UNIT // ADC1
  for (int i = 0; i < NO_OF_SAMPLES; i++) {
    adc_reading += adc1_get_raw(adc_channel);
  }
#else                        // ADC2
  int adc_buf = 0;
  for (int i = 0; i < NO_OF_SAMPLES; i++) {
    ESP_ERROR_CHECK(adc2_get_raw(adc_channel, ADC_WIDTH_BIT_12, &adc_buf));
    adc_reading += adc_buf;
  }
#endif                       // BAT_MEASURE_ADC_UNIT
  adc_reading /= NO_OF_SAMPLES;
  // Convert ADC reading to voltage in mV
  voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_characs);
#endif                       // BAT_MEASURE_ADC

#ifdef BAT_VOLTAGE_DIVIDER
  voltage *= BAT_VOLTAGE_DIVIDER;
#endif // BAT_VOLTAGE_DIVIDER

#endif // HAS_PMU

  return voltage;
}

uint8_t read_battlevel() {

  // return the battery level in values 0 ... 255 [percent],
  // values > 100 probably mean external power, depending on hardware

  const uint16_t batt_voltage = read_voltage();
  float batt_percent_fl = (float)(batt_voltage - BAT_MIN_VOLTAGE) /
                          (float)(BAT_MAX_VOLTAGE - BAT_MIN_VOLTAGE) * 100.0f;
  const uint8_t batt_percent = static_cast<uint8_t>(batt_percent_fl);

  ESP_LOGD(TAG, "batt_voltage = %dmV / batt_percent = %u%%", batt_voltage,
           batt_percent);

  return batt_percent;
}

bool batt_sufficient() {
#if (defined HAS_PMU || defined BAT_MEASURE_ADC)
  return (batt_level > OTA_MIN_BATT);
#else
  return true; // we don't know batt level
#endif
}