battery & power code sanitization

include/battery.h

@@ -1,14 +0,0 @@
-#ifndef _BATTERY_H
-#define _BATTERY_H
-
-#include <driver/adc.h>
-#include <esp_adc_cal.h>
-
-#define DEFAULT_VREF 1100 // tbd: use adc2_vref_to_gpio() for better estimate
-#define NO_OF_SAMPLES 64  // we do some multisampling to get better values
-
-uint16_t read_voltage(void);
-void calibrate_voltage(void);
-bool batt_sufficient(void);
-
-#endif

include/globals.h

@@ -121,6 +121,7 @@ extern time_t userUTCTime;
 #include "led.h"
 #include "payload.h"
 #include "blescan.h"
+#include "power.h"
 
 #if (HAS_GPS)
 #include "gpsread.h"
@@ -142,10 +143,6 @@ extern time_t userUTCTime;
 #include "button.h"
 #endif
 
-#ifdef BAT_MEASURE_ADC
-#include "battery.h"
-#endif
-
 #ifdef HAS_ANTENNA_SWITCH
 #include "antenna.h"
 #endif

include/ota.h

@@ -4,7 +4,6 @@
 #ifdef USE_OTA
 
 #include "globals.h"
-#include "battery.h"
 #include <Update.h>
 #include <WiFi.h>
 #include <WiFiClientSecure.h>

include/power.h

@@ -2,12 +2,20 @@
 #define _POWER_H
 
 #include <Arduino.h>
+#include <driver/adc.h>
+#include <esp_adc_cal.h>
 #include "i2cscan.h"
 
+#define DEFAULT_VREF 1100 // tbd: use adc2_vref_to_gpio() for better estimate
+#define NO_OF_SAMPLES 64  // we do some multisampling to get better values
+
 #ifdef HAS_PMU
 #include <axp20x.h>
 #endif
 
 void AXP192_init(void);
+uint16_t read_voltage(void);
+void calibrate_voltage(void);
+uint8_t getBattLevel (void);
 
 #endif

src/battery.cpp

@@ -1,73 +0,0 @@
-#include "globals.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));
-
-static const adc1_channel_t adc_channel = BAT_MEASURE_ADC;
-static const adc_atten_t atten = ADC_ATTEN_DB_11;
-static const adc_unit_t unit = ADC_UNIT_1;
-#endif
-
-void calibrate_voltage(void) {
-#ifdef BAT_MEASURE_ADC
-  // 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");
-  }
-#endif
-}
-
-uint16_t read_voltage() {
-#ifdef BAT_MEASURE_ADC
-  // 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
-  uint32_t voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_characs);
-#ifdef BAT_VOLTAGE_DIVIDER
-  voltage *= BAT_VOLTAGE_DIVIDER;
-#endif
-
-#ifdef BAT_MEASURE_EN // turn ext. power off
-  digitalWrite(EXT_POWER_SW, EXT_POWER_OFF);
-#endif
-
-#ifdef HAS_PMU
-  voltage = axp.getBattVoltage();
-#endif
-
-  return (uint16_t)voltage;
-#else
-  return 0;
-#endif
-}
-
-bool batt_sufficient() {
-#ifdef BAT_MEASURE_ADC
-  uint16_t volts = read_voltage();
-  return ((volts < 1000) ||
-          (volts > OTA_MIN_BATT)); // no battery or battery sufficient
-#else
-  return true;
-#endif
-}

src/cyclic.cpp

@@ -54,7 +54,7 @@ void doHousekeeping() {
 #endif
 
 // read battery voltage into global variable
-#ifdef BAT_MEASURE_ADC
+#if (defined BAT_MEASURE_ADC || defined HAS_PMU)
   batt_voltage = read_voltage();
   ESP_LOGI(TAG, "Voltage: %dmV", batt_voltage);
 #endif

src/display.cpp

@@ -188,7 +188,7 @@ void draw_page(time_t t, uint8_t page) {
   case 0:
 
 // update Battery status (line 2)
-#ifdef BAT_MEASURE_ADC
+#if (defined BAT_MEASURE_ADC || defined HAS_PMU)
     u8x8.setCursor(0, 2);
     u8x8.printf("B:%.2fV", batt_voltage / 1000.0);
 #endif

src/main.cpp

@@ -248,7 +248,7 @@ void setup() {
 #endif
 
 // initialize battery status
-#ifdef BAT_MEASURE_ADC
+#if (defined BAT_MEASURE_ADC || defined HAS_PMU)
   strcat_P(features, " BATT");
   calibrate_voltage();
   batt_voltage = read_voltage();

src/ota.cpp

@@ -41,7 +41,7 @@ inline String getHeaderValue(String header, String headerName) {
 void start_ota_update() {
 
   // check battery status if we can before doing ota
-  if (!batt_sufficient()) {
+  if (getBattLevel() == MCMD_DEVS_BATT_MIN) {
     ESP_LOGE(TAG, "Battery voltage %dmV too low for OTA", batt_voltage);
     return;
   }

src/power.cpp

@@ -2,12 +2,15 @@
 #include "globals.h"
 #include "power.h"
 
+// Local logging tag
+static const char TAG[] = __FILE__;
+
 #ifdef HAS_PMU
 
+AXP20X_Class axp;
+
 void AXP192_init(void) {
-
+  
-  AXP20X_Class axp;
-
   if (axp.begin(Wire, AXP192_PRIMARY_ADDRESS))
     ESP_LOGI(TAG, "AXP192 PMU initialization failed");
   else {
@@ -39,4 +42,91 @@ void AXP192_init(void) {
     ESP_LOGI(TAG, "AXP192 PMU initialized.");
   }
 }
-#endif // HAS_PMU
+#endif // HAS_PMU
+
+#ifdef BAT_MEASURE_ADC
+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 = BAT_MEASURE_ADC;
+static const adc_atten_t atten = ADC_ATTEN_DB_11;
+static const adc_unit_t unit = ADC_UNIT_1;
+#endif
+
+void calibrate_voltage(void) {
+#ifdef BAT_MEASURE_ADC
+  // 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");
+  }
+#endif
+}
+
+
+uint8_t getBattLevel() {
+  /*
+  return values:
+  MCMD_DEVS_EXT_POWER   = 0x00, // external power supply
+  MCMD_DEVS_BATT_MIN    = 0x01, // min battery value
+  MCMD_DEVS_BATT_MAX    = 0xFE, // max battery value
+  MCMD_DEVS_BATT_NOINFO = 0xFF, // unknown battery level
+  */
+#if (defined HAS_PMU || defined BAT_MEASURE_ADC)
+  uint16_t voltage = read_voltage();
+
+  switch (voltage) {
+  case 0:
+    return MCMD_DEVS_BATT_NOINFO;
+  case 0xffff:
+    return MCMD_DEVS_EXT_POWER;
+  default:
+    return (voltage > OTA_MIN_BATT ? MCMD_DEVS_BATT_MAX : MCMD_DEVS_BATT_MIN);
+  }
+#else // we don't have any info on battery level
+  return MCMD_DEVS_BATT_NOINFO;
+#endif
+} // getBattLevel()
+
+// u1_t os_getBattLevel(void) { return getBattLevel(); };
+
+
+uint16_t read_voltage() {
+
+  uint16_t voltage = 0;
+
+#ifdef HAS_PMU
+  voltage = axp.isVBUSPlug() ? 0xffff : axp.getBattVoltage();
+#else
+
+#ifdef BAT_MEASURE_ADC
+  // 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
+  voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_characs);
+#endif
+
+#ifdef BAT_VOLTAGE_DIVIDER
+  voltage *= BAT_VOLTAGE_DIVIDER;
+#endif
+
+#endif // HAS_PMU
+
+  return voltage;
+}