Notify battery level every 10 minutes when connected to a BLE host.

Refactor battery percent : only use uint8_t to store the battery % remaining.

src/components/battery/BatteryController.cpp

@@ -1,9 +1,7 @@
 #include "BatteryController.h"
 #include <hal/nrf_gpio.h>
 #include <nrfx_saadc.h>
-#include <libraries/log/nrf_log.h>
 #include <algorithm>
-#include <math.h>
 
 using namespace Pinetime::Controllers;
 
@@ -18,7 +16,6 @@ void Battery::Init() {
 }
 
 void Battery::Update() {
-
   isCharging = !nrf_gpio_pin_read(chargingPin);
   isPowerPresent = !nrf_gpio_pin_read(powerPresentPin);
 
@@ -33,13 +30,13 @@ void Battery::Update() {
   nrfx_saadc_sample();
 }
 
-void Battery::adcCallbackStatic(nrfx_saadc_evt_t const* event) {
+void Battery::AdcCallbackStatic(nrfx_saadc_evt_t const* event) {
   instance->SaadcEventHandler(event);
 }
 
 void Battery::SaadcInit() {
   nrfx_saadc_config_t adcConfig = NRFX_SAADC_DEFAULT_CONFIG;
-  APP_ERROR_CHECK(nrfx_saadc_init(&adcConfig, adcCallbackStatic));
+  APP_ERROR_CHECK(nrfx_saadc_init(&adcConfig, AdcCallbackStatic));
 
   nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
                                                  .resistor_n = NRF_SAADC_RESISTOR_DISABLED,
@@ -55,7 +52,6 @@ void Battery::SaadcInit() {
 }
 
 void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
-
   const uint16_t battery_max = 4180; // maximum voltage of battery ( max charging voltage is 4.21 )
   const uint16_t battery_min = 3200; // minimum voltage of battery before shutdown ( depends on the battery )
 
@@ -69,13 +65,10 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
     // reference_voltage is 0.6V
     // p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
     voltage = p_event->data.done.p_buffer[0] * 6000 / 1024;
-
     percentRemaining = (voltage - battery_min) * 100 / (battery_max - battery_min);
-
     percentRemaining = std::max(percentRemaining, 0);
     percentRemaining = std::min(percentRemaining, 100);
-
-    percentRemainingBuffer.insert(percentRemaining);
+    percentRemainingBuffer.Insert(percentRemaining);
 
     samples++;
     if (samples > percentRemainingSamples) {

src/components/battery/BatteryController.h

@@ -19,7 +19,7 @@ namespace Pinetime {
      insert member function overwrites the next data to the current
     HEAD and moves the HEAD to the newly inserted value.
     */
-      void insert(const int num) {
+      void Insert(const uint8_t num) {
         head %= cap;
         arr[head++] = num;
         if (sz != cap) {
@@ -27,13 +27,13 @@ namespace Pinetime {
         }
       }
 
-      int GetAverage() const {
+      uint8_t GetAverage() const {
         int sum = std::accumulate(arr.begin(), arr.end(), 0);
-        return (sum / sz);
+        return static_cast<uint8_t>(sum / sz);
       }
 
     private:
-      std::array<int, N> arr; /**< internal array used to store the values*/
+      std::array<uint8_t, N> arr; /**< internal array used to store the values*/
       uint8_t sz;             /**< The current size of the array.*/
       uint8_t cap;            /**< Total capacity of the CircBuffer.*/
       uint8_t head;           /**< The current head of the CircBuffer*/
@@ -46,8 +46,11 @@ namespace Pinetime {
       void Init();
       void Update();
 
-      int PercentRemaining() const {
-        return percentRemainingBuffer.GetAverage();
+      uint8_t PercentRemaining() const {
+        auto avg = percentRemainingBuffer.GetAverage();
+        avg = std::min(avg, static_cast<uint8_t>(100));
+        avg = std::max(avg, static_cast<uint8_t>(0));
+        return avg;
       }
 
       uint16_t Voltage() const {
@@ -57,6 +60,7 @@ namespace Pinetime {
       bool IsCharging() const {
         return isCharging;
       }
+
       bool IsPowerPresent() const {
         return isPowerPresent;
       }
@@ -80,7 +84,7 @@ namespace Pinetime {
       void SaadcInit();
 
       void SaadcEventHandler(nrfx_saadc_evt_t const* p_event);
-      static void adcCallbackStatic(nrfx_saadc_evt_t const* event);
+      static void AdcCallbackStatic(nrfx_saadc_evt_t const* event);
 
       bool isReading = false;
       uint8_t samples = 0;