Merge remote-tracking branch 'upstream/develop' into pinetimestyle-colorpicker

.devcontainer/Dockerfile

@@ -0,0 +1,65 @@
+FROM ubuntu:latest
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update -qq \
+    && apt-get install -y \
+# x86_64 / generic packages
+      bash \
+      build-essential \
+      cmake \
+      git \
+      make \
+      python3 \
+      python3-pip \
+      tar \
+      unzip \
+      wget \ 
+      curl \
+      dos2unix \
+      clang-format-12 \
+      clang-tidy \
+      locales \
+      libncurses5 \
+# aarch64 packages
+      libffi-dev \
+      libssl-dev \
+      python3-dev \ 
+      rustc \
+    && rm -rf /var/cache/apt/* /var/lib/apt/lists/*;
+    
+#SET LOCALE 
+RUN locale-gen en_US.UTF-8
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8 
+
+RUN pip3 install adafruit-nrfutil
+# required for McuBoot
+RUN pip3 install setuptools_rust
+
+WORKDIR /opt/
+# build.sh knows how to compile but it problimatic on Win10
+COPY build.sh .
+RUN chmod +x build.sh
+# create_build_openocd.sh uses cmake to crate to build directory
+COPY create_build_openocd.sh .
+RUN chmod +x create_build_openocd.sh
+# Lets get each in a separate docker layer for better downloads
+# GCC
+# RUN bash -c "source /opt/build.sh; GetGcc;"
+RUN wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2020q2/gcc-arm-none-eabi-9-2020-q2-update-x86_64-linux.tar.bz2 -O - | tar -xj -C /opt
+# NrfSdk
+# RUN bash -c "source /opt/build.sh; GetNrfSdk;"
+RUN wget -q "https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v15.x.x/nRF5_SDK_15.3.0_59ac345.zip" -O /tmp/nRF5_SDK_15.3.0_59ac345
+RUN unzip -q /tmp/nRF5_SDK_15.3.0_59ac345 -d /opt
+RUN rm /tmp/nRF5_SDK_15.3.0_59ac345
+# McuBoot
+# RUN bash -c "source /opt/build.sh; GetMcuBoot;"
+RUN git clone https://github.com/JuulLabs-OSS/mcuboot.git
+RUN pip3 install -r ./mcuboot/scripts/requirements.txt
+
+RUN adduser infinitime
+
+ENV NRF5_SDK_PATH /opt/nRF5_SDK_15.3.0_59ac345
+ENV ARM_NONE_EABI_TOOLCHAIN_PATH /opt/gcc-arm-none-eabi-9-2020-q2-update
+ENV SOURCES_DIR /workspaces/InfiniTime

.devcontainer/README.md

@@ -0,0 +1,60 @@
+# VS Code Dev Container
+This is a docker-based interactive development environment using VS Code and Docker Dev Containers removing the need to install any tools locally*
+
+
+
+## Requirements
+
+- VS Code
+  - [Remote - Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) extension
+- Docker
+- OpenOCD - For debugging
+
+## Using
+
+### Code editing, and building.
+
+1. Clone InfiniTime and update submodules
+2. Launch VS Code
+3. Open InfiniTime directory, 
+4. Allow VS Code to open folder with devcontainer. 
+
+After this the environment will be built if you do not currently have a container setup, it will install all the necessary tools and extra VSCode extensions. 
+
+In order to build InfiniTime we need to run the initial submodule init and CMake commands.
+
+#### Manually 
+
+ You can use the VS Code terminal to run the CMake commands as outlined in the [build instructions](blob/develop/doc/buildAndProgram.md) 
+
+#### Script
+
+The dev environment comes with some scripts to make this easier, They are located in /opt/.
+
+There are also VS Code tasks provided should you desire to use those. 
+
+The task "update submodules" will update the git submodules
+
+
+
+### Build
+
+You can use the build.sh script located in /opt/
+
+CMake is also configured and controls for the CMake plugin are available in VS Code
+
+
+
+### Debugging
+
+Docker on windows does not support passing USB devices to the underlying WSL2 subsystem, To get around this we use OpenOCD in server mode running on the host.
+
+`openocd -f <yourinterface> -f <nrf52.cfg target file>`
+
+This will launch OpenOCD in server mode and attach it to the MCU. 
+
+The default launch.json file expects OpenOCD to be listening on port 3333, edit if needed
+
+
+## Current Issues
+Currently WSL2 Has some real performance issues with IO on a windows host. Accessing files on the virtualized filesystem is much faster. Using VS Codes "clone in container" feature of the Remote - Containers will get around this. After the container is built you will need to update the submodules and follow the build instructions like normal 

.devcontainer/build.sh

@@ -0,0 +1,78 @@
+#!/bin/bash
+(return 0 2>/dev/null) && SOURCED="true" || SOURCED="false"
+export LC_ALL=C.UTF-8
+export LANG=C.UTF-8
+set -x
+set -e
+
+# Default locations if the var isn't already set
+export TOOLS_DIR="${TOOLS_DIR:=/opt}"
+export SOURCES_DIR="${SOURCES_DIR:=/sources}"
+export BUILD_DIR="${BUILD_DIR:=$SOURCES_DIR/build}"
+export OUTPUT_DIR="${OUTPUT_DIR:=$BUILD_DIR/output}"
+
+export BUILD_TYPE=${BUILD_TYPE:=Release}
+export GCC_ARM_VER=${GCC_ARM_VER:="gcc-arm-none-eabi-9-2020-q2-update"}
+export NRF_SDK_VER=${NRF_SDK_VER:="nRF5_SDK_15.3.0_59ac345"}
+
+MACHINE="$(uname -m)"
+[[ "$MACHINE" == "arm64" ]] && MACHINE="aarch64"
+
+main() {
+  local target="$1"
+
+  mkdir -p "$TOOLS_DIR"
+  
+  [[ ! -d "$TOOLS_DIR/$GCC_ARM_VER" ]] && GetGcc
+  [[ ! -d "$TOOLS_DIR/$NRF_SDK_VER" ]] && GetNrfSdk
+  [[ ! -d "$TOOLS_DIR/mcuboot" ]] && GetMcuBoot
+
+  mkdir -p "$BUILD_DIR"
+
+  CmakeGenerate
+  CmakeBuild $target
+  BUILD_RESULT=$? 
+  if [ "$DISABLE_POSTBUILD" != "true" -a "$BUILD_RESULT" == 0 ]; then
+    source "$BUILD_DIR/post_build.sh"
+  fi
+}
+
+GetGcc() {
+  GCC_SRC="$GCC_ARM_VER-$MACHINE-linux.tar.bz"
+  wget -q https://developer.arm.com/-/media/Files/downloads/gnu-rm/9-2020q2/$GCC_SRC -O - | tar -xj -C $TOOLS_DIR/
+}
+
+GetMcuBoot() {
+  git clone https://github.com/JuulLabs-OSS/mcuboot.git "$TOOLS_DIR/mcuboot"
+  pip3 install -r "$TOOLS_DIR/mcuboot/scripts/requirements.txt"
+}
+
+GetNrfSdk() {
+  wget -q "https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v15.x.x/$NRF_SDK_VER.zip" -O /tmp/$NRF_SDK_VER
+  unzip -q /tmp/$NRF_SDK_VER -d "$TOOLS_DIR/"
+  rm /tmp/$NRF_SDK_VER
+}
+
+CmakeGenerate() {
+  # We can swap the CD and trailing SOURCES_DIR for -B and -S respectively
+  # once we go to newer CMake (Ubuntu 18.10 gives us CMake 3.10)
+  cd "$BUILD_DIR"
+
+  cmake -G "Unix Makefiles" \
+    -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
+    -DUSE_OPENOCD=1 \
+    -DARM_NONE_EABI_TOOLCHAIN_PATH="$TOOLS_DIR/$GCC_ARM_VER" \
+    -DNRF5_SDK_PATH="$TOOLS_DIR/$NRF_SDK_VER" \
+    "$SOURCES_DIR"
+  cmake -L -N .
+}
+
+CmakeBuild() {
+  local target="$1"
+  [[ -n "$target" ]] && target="--target $target"
+  if cmake --build "$BUILD_DIR" --config $BUILD_TYPE $target -- -j$(nproc)
+    then return 0; else return 1; 
+  fi
+}
+
+[[ $SOURCED == "false" ]] && main "$@" || echo "Sourced!"

.devcontainer/build_app.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+cmake --build /workspaces/Pinetime/build --config Release -- -j6 pinetime-app

.devcontainer/create_build_openocd.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+rm -rf build/
+cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=Release -DUSE_OPENOCD=1 -DARM_NONE_EABI_TOOLCHAIN_PATH=/opt/gcc-arm-none-eabi-9-2020-q2-update -DNRF5_SDK_PATH=/opt/nRF5_SDK_15.3.0_59ac345 -S . -Bbuild

.devcontainer/devcontainer.json

@@ -0,0 +1,36 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.154.2/containers/cpp
+{
+	// "name": "Pinetime",
+	// "image": "feabhas/pinetime-dev"
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick an Debian / Ubuntu OS version: debian-10, debian-9, ubuntu-20.04, ubuntu-18.04
+		// "args": { "VARIANT": "ubuntu-20.04" }
+	},
+	"runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined"],
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": { 
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+		"ms-vscode.cpptools",
+		"ms-vscode.cmake-tools",
+		"marus25.cortex-debug",
+		"notskm.clang-tidy",
+		"mjohns.clang-format"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "bash /opt/create_build_openocd.sh",
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+	"remoteUser": "infinitime"
+}

.devcontainer/make_build_dir.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=Release -DUSE_OPENOCD=1 -DARM_NONE_EABI_TOOLCHAIN_PATH=/opt/gcc-arm-none-eabi-9-2020-q2-update -DNRF5_SDK_PATH=/opt/nRF5_SDK_15.3.0_59ac345 ${SOURCES_DIR}

.gitignore

@@ -4,7 +4,7 @@
 
 # CMake
 cmake-build-*
-cmake-*
+cmake-*/
 CMakeFiles
 **/CMakeCache.txt
 cmake_install.cmake

.vscode/c_cpp_properties.json

@@ -0,0 +1,20 @@
+{
+    "configurations": [
+        {
+            "name": "nrfCC",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${workspaceFolder}/src/**",
+                "${workspaceFolder}/src"
+            ],
+            "defines": [],
+            "compilerPath": "${env:ARM_NONE_EABI_TOOLCHAIN_PATH}/bin/arm-none-eabi-gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-gcc-arm",
+            "configurationProvider": "ms-vscode.cpp-tools",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
+        }
+    ],
+    "version": 4
+}

.vscode/cmake-variants.json

@@ -0,0 +1,62 @@
+{
+    "buildType": {
+      "default": "release",
+        "choices": { 
+          "debug": {
+            "short": "Debug",
+            "long": "Emit debug information without performing optimizations",
+            "buildType": "Debug"
+          },
+          "release": {
+            "short": "Release",
+            "long": "Perform optimizations",
+            "buildType": "Release"
+          }    
+        }
+    },
+    "programmer":{
+        "default": "OpenOCD",
+        "choices":{
+            "OpenOCD":{
+                "short":"OpenOCD",
+                "long": "Use OpenOCD",
+                "settings":{
+                    "USE_OPENOCD":1
+                }
+            },
+            "JLink":{
+                "short":"JLink",
+                "long": "Use JLink",
+                "settings":{
+                    "USE_JLINK":1
+                }
+            },
+            "GDB":{
+                "short":"GDB",
+                "long": "Use GDB",
+                "settings":{
+                    "USE_GDB_CLIENT":1
+                }
+            }
+        }
+    },
+    "DFU": {
+        "default": "no",
+          "choices": { 
+            "no": {
+              "short": "No DFU",
+              "long": "Do not build DFU",
+              "settings": {
+                  "BUILD_DFU":"0"
+                }
+            },
+            "yes": {
+                "short": "Build DFU",
+                "long": "Build DFU",
+                "settings": {
+                    "BUILD_DFU":"1"
+                }
+            }
+        }
+    }
+}

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+    "recommendations": ["ms-vscode.cpptools","ms-vscode.cmake-tools","marus25.cortex-debug"]
+}

.vscode/launch.json

@@ -0,0 +1,46 @@
+  {
+    "version": "0.1.0",
+    "configurations": [
+        {
+            "name": "Debug - Openocd docker Remote",
+            "type":"cortex-debug",
+            "cortex-debug.armToolchainPath":"${env:ARM_NONE_EABI_TOOLCHAIN_PATH}/bin",
+            "cwd": "${workspaceRoot}",
+            "executable": "${command:cmake.launchTargetPath}",
+            "request": "launch",
+            "servertype": "external",
+            // This may need to be arm-none-eabi-gdb depending on your system
+            "gdbPath" : "${env:ARM_NONE_EABI_TOOLCHAIN_PATH}/bin/arm-none-eabi-gdb",
+            // Connect to an already running OpenOCD instance
+            "gdbTarget": "host.docker.internal:3333",
+            "svdFile": "${workspaceRoot}/nrf52.svd",
+            "runToMain": true,
+            // Work around for stopping at main on restart
+            "postRestartCommands": [
+                "break main",
+                "continue"
+            ]
+        },
+        {
+            "name": "Debug - Openocd Local",
+            "type":"cortex-debug",
+            "cortex-debug.armToolchainPath":"${env:ARM_NONE_EABI_TOOLCHAIN_PATH}/bin",
+            "cwd": "${workspaceRoot}",
+            "executable": "${command:cmake.launchTargetPath}",
+            "request": "launch",
+            "servertype": "openocd",
+            // This may need to be arm-none-eabi-gdb depending on your system
+            "gdbPath" : "${env:ARM_NONE_EABI_TOOLCHAIN_PATH}/bin/arm-none-eabi-gdb",
+            // Connect to an already running OpenOCD instance
+            "gdbTarget": "localhost:3333",
+            "svdFile": "${workspaceRoot}/nrf52.svd",
+            "runToMain": true,
+            // Work around for stopping at main on restart
+            "postRestartCommands": [
+                "break main",
+                "continue"
+            ]
+        }
+
+    ]
+}

.vscode/settings.json

@@ -1,59 +1,9 @@
 {
-    "files.associations": {
+    "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
-        "chrono": "cpp",
+    "cmake.configureArgs": [
-        "list": "cpp",
+        "-DARM_NONE_EABI_TOOLCHAIN_PATH=${env:ARM_NONE_EABI_TOOLCHAIN_PATH}",
-        "array": "cpp",
+        "-DNRF5_SDK_PATH=${env:NRF5_SDK_PATH}",
-        "atomic": "cpp",
+    ],
-        "bit": "cpp",
+    "cmake.generator": "Unix Makefiles",
-        "*.tcc": "cpp",
+    "clang-tidy.buildPath": "build/compile_commands.json"
-        "cctype": "cpp",
-        "charconv": "cpp",
-        "clocale": "cpp",
-        "cmath": "cpp",
-        "condition_variable": "cpp",
-        "cstdarg": "cpp",
-        "cstddef": "cpp",
-        "cstdint": "cpp",
-        "cstdio": "cpp",
-        "cstdlib": "cpp",
-        "cstring": "cpp",
-        "ctime": "cpp",
-        "cwchar": "cpp",
-        "cwctype": "cpp",
-        "deque": "cpp",
-        "unordered_map": "cpp",
-        "vector": "cpp",
-        "exception": "cpp",
-        "algorithm": "cpp",
-        "functional": "cpp",
-        "iterator": "cpp",
-        "memory": "cpp",
-        "memory_resource": "cpp",
-        "netfwd": "cpp",
-        "numeric": "cpp",
-        "optional": "cpp",
-        "random": "cpp",
-        "ratio": "cpp",
-        "string": "cpp",
-        "string_view": "cpp",
-        "system_error": "cpp",
-        "tuple": "cpp",
-        "type_traits": "cpp",
-        "utility": "cpp",
-        "fstream": "cpp",
-        "initializer_list": "cpp",
-        "iosfwd": "cpp",
-        "iostream": "cpp",
-        "istream": "cpp",
-        "limits": "cpp",
-        "mutex": "cpp",
-        "new": "cpp",
-        "ostream": "cpp",
-        "sstream": "cpp",
-        "stdexcept": "cpp",
-        "streambuf": "cpp",
-        "thread": "cpp",
-        "cinttypes": "cpp",
-        "typeinfo": "cpp"
-    }
 }

.vscode/tasks.json

@@ -0,0 +1,44 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"label": "create openocd build",
+			"type": "shell",
+			"command": "/opt/create_build_openocd.sh",
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+			"presentation": {
+				"reveal": "always",
+				"panel": "shared"
+			},
+			"problemMatcher": []
+		},
+		{
+			"label": "update submodules",
+			"type": "shell",
+			"command": "git submodule update --init",
+			"options": {
+				"cwd": "${workspaceFolder}"
+			},
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+			"presentation": {
+				"reveal": "always",
+				"panel": "shared"
+			},
+			"problemMatcher": []
+		},
+		{
+			"label": "BuildInit",
+			"dependsOn": [
+				"update submodules",
+				"create openocd build"
+			],
+			"problemMatcher": []
+		}
+	]
+}

README.md

@@ -93,6 +93,7 @@ As of now, here is the list of achievements of this project:
  - [Build the project](doc/buildAndProgram.md)
  - [Flash the firmware using OpenOCD and STLinkV2](doc/openOCD.md)
  - [Build the project with Docker](doc/buildWithDocker.md)
+ - [Build the project with VSCode](doc/buildWithVScode.md)
  - [Bootloader, OTA and DFU](./bootloader/README.md)
  - [Stub using NRF52-DK](./doc/PinetimeStubWithNrf52DK.md)
  - Logging with JLink RTT.

doc/buildWithVScode.md

@@ -0,0 +1,42 @@
+# Build and Develop the project using VS Code
+
+The .VS Code folder contains configuration files for developing InfiniTime with VS Code. Effort was made to have these rely on Environment variables instead of hardcoded paths.
+
+## Environment Setup
+
+To support as many setups as possible the VS Code configuration files expect there to be certain environment variables to be set.
+
+ Variable | Description | Example
+----------|-------------|--------
+**ARM_NONE_EABI_TOOLCHAIN_PATH**|path to the toolchain directory|`export ARM_NONE_EABI_TOOLCHAIN_PATH=/opt/gcc-arm-none-eabi-9-2020-q2-update`
+**NRF5_SDK_PATH**|path to the NRF52 SDK|`export NRF5_SDK_PATH=/opt/nRF5_SDK_15.3.0_59ac345`
+
+## VS Code Extensions
+
+We leverage a few VS Code extensions for ease of development.
+
+#### Required Extensions
+
+- [C/C++](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools) - C/C++ IntelliSense, debugging, and code browsing.
+- [CMake Tools](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cmake-tools) - Extended CMake support in Visual Studio Code
+
+#### Optional Extensions
+
+[Cortex-Debug](https://marketplace.visualstudio.com/items?itemName=marus25.cortex-debug) - ARM Cortex-M GDB Debugger support for VS Code
+
+Cortex-Debug is only required for interactive debugging using VS Codes built in GDB support.
+
+
+
+## VS Code/Docker DevContainer
+
+The .devcontainer folder contains the configuration and scripts for using a Docker dev container for building InfiniTime
+
+Using the [Remote-Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) extension is recommended. It will handle configuring the Docker virtual machine and setting everything up. 
+
+More documentation is available in the [readme in .devcontainer](.devcontainer/readme.md)	
+
+
+
+
+

src/components/battery/BatteryController.cpp

@@ -23,7 +23,6 @@ void Battery::Update() {
     return;
   }
   // Non blocking read
-  samples = 0;
   isReading = true;
   SaadcInit();
 
@@ -40,9 +39,9 @@ void Battery::SaadcInit() {
 
   nrf_saadc_channel_config_t adcChannelConfig = {.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
                                                  .resistor_n = NRF_SAADC_RESISTOR_DISABLED,
-                                                 .gain = NRF_SAADC_GAIN1_5,
+                                                 .gain = NRF_SAADC_GAIN1_4,
                                                  .reference = NRF_SAADC_REFERENCE_INTERNAL,
-                                                 .acq_time = NRF_SAADC_ACQTIME_3US,
+                                                 .acq_time = NRF_SAADC_ACQTIME_40US,
                                                  .mode = NRF_SAADC_MODE_SINGLE_ENDED,
                                                  .burst = NRF_SAADC_BURST_ENABLED,
                                                  .pin_p = batteryVoltageAdcInput,
@@ -60,22 +59,21 @@ void Battery::SaadcEventHandler(nrfx_saadc_evt_t const* p_event) {
     APP_ERROR_CHECK(nrfx_saadc_buffer_convert(&saadc_value, 1));
 
     // A hardware voltage divider divides the battery voltage by 2
-    // ADC gain is 1/5
+    // ADC gain is 1/4
-    // thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 10
+    // thus adc_voltage = battery_voltage / 2 * gain = battery_voltage / 8
-    // reference_voltage is 0.6V
+    // reference_voltage is 600mV
     // p_event->data.done.p_buffer[0] = (adc_voltage / reference_voltage) * 1024
-    voltage = p_event->data.done.p_buffer[0] * 6000 / 1024;
+    voltage = p_event->data.done.p_buffer[0] * (8 * 600) / 1024;
-    percentRemaining = (voltage - battery_min) * 100 / (battery_max - battery_min);
+
-    percentRemaining = std::max(percentRemaining, 0);
+    if (voltage > battery_max) {
-    percentRemaining = std::min(percentRemaining, 100);
+      percentRemaining = 100;
-    percentRemainingBuffer.Insert(percentRemaining);
+    } else if (voltage < battery_min) {
+      percentRemaining = 0;
+    } else {
+      percentRemaining = (voltage - battery_min) * 100 / (battery_max - battery_min);
+    }
 
-    samples++;
-    if (samples > percentRemainingSamples) {
     nrfx_saadc_uninit();
     isReading = false;
-    } else {
-      nrfx_saadc_sample();
-    }
   }
 }

src/components/battery/BatteryController.h

@@ -7,38 +7,6 @@
 namespace Pinetime {
   namespace Controllers {
 
-    /** A simple circular buffer that can be used to average
-     out the sensor values. The total capacity of the CircBuffer
-    is given as the template parameter N.
-    */
-    template <int N> class CircBuffer {
-    public:
-      CircBuffer() : arr {}, sz {}, cap {N}, head {} {
-      }
-      /**
-     insert member function overwrites the next data to the current
-    HEAD and moves the HEAD to the newly inserted value.
-    */
-      void Insert(const uint8_t num) {
-        head %= cap;
-        arr[head++] = num;
-        if (sz != cap) {
-          sz++;
-        }
-      }
-
-      uint8_t GetAverage() const {
-        int sum = std::accumulate(arr.begin(), arr.end(), 0);
-        return static_cast<uint8_t>(sum / sz);
-      }
-
-    private:
-      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*/
-    };
-
     class Battery {
     public:
       Battery();
@@ -47,10 +15,7 @@ namespace Pinetime {
       void Update();
 
       uint8_t PercentRemaining() const {
-        auto avg = percentRemainingBuffer.GetAverage();
+        return percentRemaining;
-        avg = std::min(avg, static_cast<uint8_t>(100));
-        avg = std::max(avg, static_cast<uint8_t>(0));
-        return avg;
       }
 
       uint16_t Voltage() const {
@@ -69,14 +34,11 @@ namespace Pinetime {
       static Battery* instance;
       nrf_saadc_value_t saadc_value;
 
-      static constexpr uint8_t percentRemainingSamples = 5;
-      CircBuffer<percentRemainingSamples> percentRemainingBuffer {};
-
       static constexpr uint32_t chargingPin = 12;
       static constexpr uint32_t powerPresentPin = 19;
       static constexpr nrf_saadc_input_t batteryVoltageAdcInput = NRF_SAADC_INPUT_AIN7;
       uint16_t voltage = 0;
-      int percentRemaining = -1;
+      uint8_t percentRemaining = 0;
 
       bool isCharging = false;
       bool isPowerPresent = false;
@@ -87,7 +49,6 @@ namespace Pinetime {
       static void AdcCallbackStatic(nrfx_saadc_evt_t const* event);
 
       bool isReading = false;
-      uint8_t samples = 0;
     };
   }
 }

src/components/datetime/DateTimeController.cpp

@@ -55,9 +55,9 @@ void DateTime::UpdateTime(uint32_t systickCounter) {
   auto time = date::make_time(currentDateTime - dp);
   auto yearMonthDay = date::year_month_day(dp);
 
-  year = (int) yearMonthDay.year();
+  year = static_cast<int>(yearMonthDay.year());
-  month = static_cast<Months>((unsigned) yearMonthDay.month());
+  month = static_cast<Months>(static_cast<unsigned>(yearMonthDay.month()));
-  day = (unsigned) yearMonthDay.day();
+  day = static_cast<unsigned>(yearMonthDay.day());
   dayOfWeek = static_cast<Days>(date::weekday(yearMonthDay).iso_encoding());
 
   hour = time.hours().count();
@@ -75,31 +75,31 @@ void DateTime::UpdateTime(uint32_t systickCounter) {
 }
 
 const char* DateTime::MonthShortToString() {
-  return DateTime::MonthsString[(uint8_t) month];
+  return DateTime::MonthsString[static_cast<uint8_t>(month)];
 }
 
 const char* DateTime::MonthShortToStringLow() {
-  return DateTime::MonthsStringLow[(uint8_t) month];
+  return DateTime::MonthsStringLow[static_cast<uint8_t>(month)];
 }
 
 const char* DateTime::MonthsToStringLow() {
-  return DateTime::MonthsLow[(uint8_t) month];
+  return DateTime::MonthsLow[static_cast<uint8_t>(month)];
 }
 
 const char* DateTime::DayOfWeekToString() {
-  return DateTime::DaysString[(uint8_t) dayOfWeek];
+  return DateTime::DaysString[static_cast<uint8_t>(dayOfWeek)];
 }
 
 const char* DateTime::DayOfWeekShortToString() {
-  return DateTime::DaysStringShort[(uint8_t) dayOfWeek];
+  return DateTime::DaysStringShort[static_cast<uint8_t>(dayOfWeek)];
 }
 
 const char* DateTime::DayOfWeekToStringLow() {
-  return DateTime::DaysStringLow[(uint8_t) dayOfWeek];
+  return DateTime::DaysStringLow[static_cast<uint8_t>(dayOfWeek)];
 }
 
 const char* DateTime::DayOfWeekShortToStringLow() {
-  return DateTime::DaysStringShortLow[(uint8_t) dayOfWeek];
+  return DateTime::DaysStringShortLow[static_cast<uint8_t>(dayOfWeek)];
 }
 
 void DateTime::Register(Pinetime::System::SystemTask* systemTask) {

src/displayapp/screens/BatteryIcon.cpp

@@ -5,13 +5,13 @@
 using namespace Pinetime::Applications::Screens;
 
 const char* BatteryIcon::GetBatteryIcon(uint8_t batteryPercent) {
-  if (batteryPercent > 90)
+  if (batteryPercent > 87)
     return Symbols::batteryFull;
-  if (batteryPercent > 75)
+  if (batteryPercent > 62)
     return Symbols::batteryThreeQuarter;
-  if (batteryPercent > 50)
+  if (batteryPercent > 37)
     return Symbols::batteryHalf;
-  if (batteryPercent > 25)
+  if (batteryPercent > 12)
     return Symbols::batteryOneQuarter;
   return Symbols::batteryEmpty;
 }

src/displayapp/screens/Clock.cpp

@@ -2,11 +2,6 @@
 
 #include <date/date.h>
 #include <lvgl/lvgl.h>
-#include <cstdio>
-#include "BatteryIcon.h"
-#include "BleIcon.h"
-#include "NotificationIcon.h"
-#include "Symbols.h"
 #include "components/battery/BatteryController.h"
 #include "components/motion/MotionController.h"
 #include "components/ble/BleController.h"
@@ -89,16 +84,3 @@ std::unique_ptr<Screen> Clock::PineTimeStyleScreen() {
                                                      settingsController,
                                                      motionController);
 }
-
-/*
-// Examples for more watch faces
-std::unique_ptr<Screen> Clock::WatchFaceMinimalScreen() {
-  return std::make_unique<Screens::WatchFaceMinimal>(app, dateTimeController, batteryController, bleController, notificatioManager,
-settingsController);
-}
-
-std::unique_ptr<Screen> Clock::WatchFaceCustomScreen() {
-  return std::make_unique<Screens::WatchFaceCustom>(app, dateTimeController, batteryController, bleController, notificatioManager,
-settingsController);
-}
-*/

src/displayapp/screens/Clock.h

@@ -9,9 +9,6 @@
 #include "components/datetime/DateTimeController.h"
 
 namespace Pinetime {
-  namespace Drivers {
-    class BMA421;
-  }
   namespace Controllers {
     class Settings;
     class Battery;
@@ -51,10 +48,6 @@ namespace Pinetime {
         std::unique_ptr<Screen> WatchFaceDigitalScreen();
         std::unique_ptr<Screen> WatchFaceAnalogScreen();
         std::unique_ptr<Screen> PineTimeStyleScreen();
-
-        // Examples for more watch faces
-        // std::unique_ptr<Screen> WatchFaceMinimalScreen();
-        // std::unique_ptr<Screen> WatchFaceCustomScreen();
       };
     }
   }

src/displayapp/screens/PineTimeStyle.cpp

@@ -218,26 +218,17 @@ bool PineTimeStyle::Refresh() {
 
   bleState = bleController.IsConnected();
   if (bleState.IsUpdated()) {
-    if (bleState.Get() == true) {
+    lv_label_set_text(bleIcon, BleIcon::GetIcon(bleState.Get()));
-      lv_label_set_text(bleIcon, BleIcon::GetIcon(true));
     lv_obj_realign(bleIcon);
-    } else {
-      lv_label_set_text(bleIcon, BleIcon::GetIcon(false));
-    }
   }
 
   notificationState = notificatioManager.AreNewNotificationsAvailable();
   if (notificationState.IsUpdated()) {
-    if (notificationState.Get() == true) {
+    lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(notificationState.Get()));
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(true));
     lv_obj_realign(notificationIcon);
-    } else {
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(false));
-    }
   }
 
   currentDateTime = dateTimeController.CurrentDateTime();
-
   if (currentDateTime.IsUpdated()) {
     auto newDateTime = currentDateTime.Get();
 
@@ -245,9 +236,9 @@ bool PineTimeStyle::Refresh() {
     auto time = date::make_time(newDateTime - dp);
     auto yearMonthDay = date::year_month_day(dp);
 
-    auto year = (int) yearMonthDay.year();
+    auto year = static_cast<int>(yearMonthDay.year());
-    auto month = static_cast<Pinetime::Controllers::DateTime::Months>((unsigned) yearMonthDay.month());
+    auto month = static_cast<Pinetime::Controllers::DateTime::Months>(static_cast<unsigned>(yearMonthDay.month()));
-    auto day = (unsigned) yearMonthDay.day();
+    auto day = static_cast<unsigned>(yearMonthDay.day());
     auto dayOfWeek = static_cast<Pinetime::Controllers::DateTime::Days>(date::weekday(yearMonthDay).iso_encoding());
 
     int hour = time.hours().count();
@@ -258,7 +249,6 @@ bool PineTimeStyle::Refresh() {
 
     char hoursChar[3];
     char ampmChar[5];
-
     if (settingsController.GetClockType() == Controllers::Settings::ClockType::H24) {
         sprintf(hoursChar, "%02d", hour);
     } else {
@@ -277,41 +267,26 @@ bool PineTimeStyle::Refresh() {
       sprintf(hoursChar, "%02d", hour);
     }
 
-    if (hoursChar[0] != displayedChar[0] || hoursChar[1] != displayedChar[1] || minutesChar[0] != displayedChar[2] ||
+    if (hoursChar[0] != displayedChar[0] or hoursChar[1] != displayedChar[1] or minutesChar[0] != displayedChar[2] or
         minutesChar[1] != displayedChar[3]) {
       displayedChar[0] = hoursChar[0];
       displayedChar[1] = hoursChar[1];
       displayedChar[2] = minutesChar[0];
       displayedChar[3] = minutesChar[1];
 
-      char hourStr[3];
-      char minStr[3];
-
       if (settingsController.GetClockType() == Controllers::Settings::ClockType::H12) {
         lv_label_set_text(timeAMPM, ampmChar);
       }
 
-      // Display the time as 2 pairs of digits
+      lv_label_set_text_fmt(timeDD1, "%s", hoursChar);
-      sprintf(hourStr, "%c%c", hoursChar[0], hoursChar[1]);
+      lv_label_set_text_fmt(timeDD2, "%s", minutesChar);
-      lv_label_set_text(timeDD1, hourStr);
-
-      sprintf(minStr, "%c%c", minutesChar[0], minutesChar[1]);
-      lv_label_set_text(timeDD2, minStr);
     }
 
     if ((year != currentYear) || (month != currentMonth) || (dayOfWeek != currentDayOfWeek) || (day != currentDay)) {
-      char dayOfWeekStr[4];
+      lv_label_set_text_fmt(dateDayOfWeek, "%s", dateTimeController.DayOfWeekShortToString());
-      char dayStr[3];
+      lv_label_set_text_fmt(dateDay, "%d", day);
-      char monthStr[4];
-
-      sprintf(dayOfWeekStr, "%s", dateTimeController.DayOfWeekShortToString());
-      sprintf(dayStr, "%d", day);
-      sprintf(monthStr, "%s", dateTimeController.MonthShortToString());
-
-      lv_label_set_text(dateDayOfWeek, dayOfWeekStr);
-      lv_label_set_text(dateDay, dayStr);
       lv_obj_realign(dateDay);
-      lv_label_set_text(dateMonth, monthStr);
+      lv_label_set_text_fmt(dateMonth, "%s", dateTimeController.MonthShortToString());
 
       currentYear = year;
       currentMonth = month;

src/displayapp/screens/PineTimeStyle.h

@@ -32,8 +32,6 @@ namespace Pinetime {
 
         bool Refresh() override;
 
-        void OnObjectEvent(lv_obj_t* pObj, lv_event_t i);
-
       private:
         char displayedChar[5];
 
@@ -67,9 +65,6 @@ namespace Pinetime {
         lv_obj_t* calendarBar2;
         lv_obj_t* calendarCrossBar1;
         lv_obj_t* calendarCrossBar2;
-        lv_obj_t* heartbeatIcon;
-        lv_obj_t* heartbeatValue;
-        lv_obj_t* heartbeatBpm;
         lv_obj_t* notificationIcon;
         lv_obj_t* stepGauge;
         lv_color_t needle_colors[1];

src/displayapp/screens/WatchFaceAnalog.cpp

@@ -10,38 +10,37 @@ LV_IMG_DECLARE(bg_clock);
 using namespace Pinetime::Applications::Screens;
 
 namespace {
-
+constexpr int16_t HourLength = 70;
-constexpr auto HOUR_LENGTH = 70;
+constexpr int16_t MinuteLength = 90;
-constexpr auto MINUTE_LENGTH = 90;
+constexpr int16_t SecondLength = 110;
-constexpr auto SECOND_LENGTH = 110;
 
 // sin(90) = 1 so the value of _lv_trigo_sin(90) is the scaling factor
 const auto LV_TRIG_SCALE = _lv_trigo_sin(90);
 
-int16_t cosine(int16_t angle) {
+int16_t Cosine(int16_t angle) {
   return _lv_trigo_sin(angle + 90);
 }
 
-int16_t sine(int16_t angle) {
+int16_t Sine(int16_t angle) {
   return _lv_trigo_sin(angle);
 }
 
-int16_t coordinate_x_relocate(int16_t x) {
+int16_t CoordinateXRelocate(int16_t x) {
   return (x + LV_HOR_RES / 2);
 }
 
-int16_t coordinate_y_relocate(int16_t y) {
+int16_t CoordinateYRelocate(int16_t y) {
   return std::abs(y - LV_HOR_RES / 2);
 }
 
-lv_point_t coordinate_relocate(int16_t radius, int16_t angle) {
+lv_point_t CoordinateRelocate(int16_t radius, int16_t angle) {
   return lv_point_t{
-    .x = coordinate_x_relocate(radius * static_cast<int32_t>(sine(angle)) / LV_TRIG_SCALE),
+    .x = CoordinateXRelocate(radius * static_cast<int32_t>(Sine(angle)) / LV_TRIG_SCALE),
-    .y = coordinate_y_relocate(radius * static_cast<int32_t>(cosine(angle)) / LV_TRIG_SCALE)
+    .y = CoordinateYRelocate(radius * static_cast<int32_t>(Cosine(angle)) / LV_TRIG_SCALE)
   };
 }
 
-} // namespace
+}
 
 WatchFaceAnalog::WatchFaceAnalog(Pinetime::Applications::DisplayApp* app,
                                  Controllers::DateTime& dateTimeController,
@@ -123,7 +122,6 @@ WatchFaceAnalog::WatchFaceAnalog(Pinetime::Applications::DisplayApp* app,
 }
 
 WatchFaceAnalog::~WatchFaceAnalog() {
-
   lv_style_reset(&hour_line_style);
   lv_style_reset(&hour_line_style_trace);
   lv_style_reset(&minute_line_style);
@@ -134,18 +132,17 @@ WatchFaceAnalog::~WatchFaceAnalog() {
 }
 
 void WatchFaceAnalog::UpdateClock() {
-
   hour = dateTimeController.Hours();
   minute = dateTimeController.Minutes();
   second = dateTimeController.Seconds();
 
   if (sMinute != minute) {
     auto const angle = minute * 6;
-    minute_point[0] = coordinate_relocate(30, angle);
+    minute_point[0] = CoordinateRelocate(30, angle);
-    minute_point[1] = coordinate_relocate(MINUTE_LENGTH, angle);
+    minute_point[1] = CoordinateRelocate(MinuteLength, angle);
 
-    minute_point_trace[0] = coordinate_relocate(5, angle);
+    minute_point_trace[0] = CoordinateRelocate(5, angle);
-    minute_point_trace[1] = coordinate_relocate(31, angle);
+    minute_point_trace[1] = CoordinateRelocate(31, angle);
 
     lv_line_set_points(minute_body, minute_point, 2);
     lv_line_set_points(minute_body_trace, minute_point_trace, 2);
@@ -156,11 +153,11 @@ void WatchFaceAnalog::UpdateClock() {
     sMinute = minute;
     auto const angle = (hour * 30 + minute / 2);
 
-    hour_point[0] = coordinate_relocate(30, angle);
+    hour_point[0] = CoordinateRelocate(30, angle);
-    hour_point[1] = coordinate_relocate(HOUR_LENGTH, angle);
+    hour_point[1] = CoordinateRelocate(HourLength, angle);
 
-    hour_point_trace[0] = coordinate_relocate(5, angle);
+    hour_point_trace[0] = CoordinateRelocate(5, angle);
-    hour_point_trace[1] = coordinate_relocate(31, angle);
+    hour_point_trace[1] = CoordinateRelocate(31, angle);
 
     lv_line_set_points(hour_body, hour_point, 2);
     lv_line_set_points(hour_body_trace, hour_point_trace, 2);
@@ -170,8 +167,8 @@ void WatchFaceAnalog::UpdateClock() {
     sSecond = second;
     auto const angle = second * 6;
 
-    second_point[0] = coordinate_relocate(-20, angle);
+    second_point[0] = CoordinateRelocate(-20, angle);
-    second_point[1] = coordinate_relocate(SECOND_LENGTH, angle);
+    second_point[1] = CoordinateRelocate(SecondLength, angle);
     lv_line_set_points(second_body, second_point, 2);
   }
 }
@@ -186,16 +183,12 @@ bool WatchFaceAnalog::Refresh() {
   notificationState = notificationManager.AreNewNotificationsAvailable();
 
   if (notificationState.IsUpdated()) {
-    if (notificationState.Get() == true)
+    lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(notificationState.Get()));
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(true));
-    else
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(false));
   }
 
   currentDateTime = dateTimeController.CurrentDateTime();
 
   if (currentDateTime.IsUpdated()) {
-
     month = dateTimeController.Month();
     day = dateTimeController.Day();
     dayOfWeek = dateTimeController.DayOfWeek();
@@ -203,7 +196,6 @@ bool WatchFaceAnalog::Refresh() {
     UpdateClock();
 
     if ((month != currentMonth) || (dayOfWeek != currentDayOfWeek) || (day != currentDay)) {
-
       lv_label_set_text_fmt(label_date_day, "%s\n%02i", dateTimeController.DayOfWeekShortToString(), day);
 
       currentMonth = month;

src/displayapp/screens/WatchFaceAnalog.h

@@ -58,14 +58,12 @@ namespace Pinetime {
         lv_obj_t* minute_body_trace;
         lv_obj_t* second_body;
 
-        // ##
         lv_point_t hour_point[2];
         lv_point_t hour_point_trace[2];
         lv_point_t minute_point[2];
         lv_point_t minute_point_trace[2];
         lv_point_t second_point[2];
 
-        // ##
         lv_style_t hour_line_style;
         lv_style_t hour_line_style_trace;
         lv_style_t minute_line_style;

src/displayapp/screens/WatchFaceDigital.cpp

@@ -12,9 +12,6 @@
 #include "components/ble/NotificationManager.h"
 #include "components/heartrate/HeartRateController.h"
 #include "components/motion/MotionController.h"
-#include "components/settings/Settings.h"
-#include "../DisplayApp.h"
-
 using namespace Pinetime::Applications::Screens;
 
 WatchFaceDigital::WatchFaceDigital(DisplayApp* app,
@@ -36,12 +33,6 @@ WatchFaceDigital::WatchFaceDigital(DisplayApp* app,
     motionController {motionController} {
   settingsController.SetClockFace(0);
 
-  displayedChar[0] = 0;
-  displayedChar[1] = 0;
-  displayedChar[2] = 0;
-  displayedChar[3] = 0;
-  displayedChar[4] = 0;
-
   batteryIcon = lv_label_create(lv_scr_act(), nullptr);
   lv_label_set_text(batteryIcon, Symbols::batteryFull);
   lv_obj_align(batteryIcon, lv_scr_act(), LV_ALIGN_IN_TOP_RIGHT, -5, 2);
@@ -56,7 +47,7 @@ WatchFaceDigital::WatchFaceDigital(DisplayApp* app,
   lv_label_set_text(bleIcon, Symbols::bluetooth);
   lv_obj_align(bleIcon, batteryPlug, LV_ALIGN_OUT_LEFT_MID, -5, 0);
 
-  notificationIcon = lv_label_create(lv_scr_act(), NULL);
+  notificationIcon = lv_label_create(lv_scr_act(), nullptr);
   lv_obj_set_style_local_text_color(notificationIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0x00FF00));
   lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(false));
   lv_obj_align(notificationIcon, nullptr, LV_ALIGN_IN_TOP_LEFT, 10, 0);
@@ -111,17 +102,13 @@ bool WatchFaceDigital::Refresh() {
   if (batteryPercentRemaining.IsUpdated()) {
     auto batteryPercent = batteryPercentRemaining.Get();
     lv_label_set_text(batteryIcon, BatteryIcon::GetBatteryIcon(batteryPercent));
-    auto isCharging = batteryController.IsCharging() || batteryController.IsPowerPresent();
+    auto isCharging = batteryController.IsCharging() or batteryController.IsPowerPresent();
     lv_label_set_text(batteryPlug, BatteryIcon::GetPlugIcon(isCharging));
   }
 
   bleState = bleController.IsConnected();
   if (bleState.IsUpdated()) {
-    if (bleState.Get() == true) {
+    lv_label_set_text(bleIcon, BleIcon::GetIcon(bleState.Get()));
-      lv_label_set_text(bleIcon, BleIcon::GetIcon(true));
-    } else {
-      lv_label_set_text(bleIcon, BleIcon::GetIcon(false));
-    }
   }
   lv_obj_align(batteryIcon, lv_scr_act(), LV_ALIGN_IN_TOP_RIGHT, -5, 5);
   lv_obj_align(batteryPlug, batteryIcon, LV_ALIGN_OUT_LEFT_MID, -5, 0);
@@ -129,10 +116,7 @@ bool WatchFaceDigital::Refresh() {
 
   notificationState = notificatioManager.AreNewNotificationsAvailable();
   if (notificationState.IsUpdated()) {
-    if (notificationState.Get() == true)
+    lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(notificationState.Get()));
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(true));
-    else
-      lv_label_set_text(notificationIcon, NotificationIcon::GetIcon(false));
   }
 
   currentDateTime = dateTimeController.CurrentDateTime();
@@ -144,9 +128,9 @@ bool WatchFaceDigital::Refresh() {
     auto time = date::make_time(newDateTime - dp);
     auto yearMonthDay = date::year_month_day(dp);
 
-    auto year = (int) yearMonthDay.year();
+    auto year = static_cast<int>(yearMonthDay.year());
-    auto month = static_cast<Pinetime::Controllers::DateTime::Months>((unsigned) yearMonthDay.month());
+    auto month = static_cast<Pinetime::Controllers::DateTime::Months>(static_cast<unsigned>(yearMonthDay.month()));
-    auto day = (unsigned) yearMonthDay.day();
+    auto day = static_cast<unsigned>(yearMonthDay.day());
     auto dayOfWeek = static_cast<Pinetime::Controllers::DateTime::Days>(date::weekday(yearMonthDay).iso_encoding());
 
     int hour = time.hours().count();
@@ -175,15 +159,13 @@ bool WatchFaceDigital::Refresh() {
       sprintf(hoursChar, "%02d", hour);
     }
 
-    if (hoursChar[0] != displayedChar[0] || hoursChar[1] != displayedChar[1] || minutesChar[0] != displayedChar[2] ||
+    if ((hoursChar[0] != displayedChar[0]) or (hoursChar[1] != displayedChar[1]) or (minutesChar[0] != displayedChar[2]) or
-        minutesChar[1] != displayedChar[3]) {
+        (minutesChar[1] != displayedChar[3])) {
       displayedChar[0] = hoursChar[0];
       displayedChar[1] = hoursChar[1];
       displayedChar[2] = minutesChar[0];
       displayedChar[3] = minutesChar[1];
 
-      char timeStr[6];
-
       if (settingsController.GetClockType() == Controllers::Settings::ClockType::H12) {
         lv_label_set_text(label_time_ampm, ampmChar);
         if (hoursChar[0] == '0') {
@@ -191,8 +173,7 @@ bool WatchFaceDigital::Refresh() {
         }
       }
 
-      sprintf(timeStr, "%c%c:%c%c", hoursChar[0], hoursChar[1], minutesChar[0], minutesChar[1]);
+      lv_label_set_text_fmt(label_time, "%s:%s", hoursChar, minutesChar);
-      lv_label_set_text(label_time, timeStr);
 
       if (settingsController.GetClockType() == Controllers::Settings::ClockType::H12) {
         lv_obj_align(label_time, lv_scr_act(), LV_ALIGN_IN_RIGHT_MID, 0, 0);
@@ -202,13 +183,11 @@ bool WatchFaceDigital::Refresh() {
     }
 
     if ((year != currentYear) || (month != currentMonth) || (dayOfWeek != currentDayOfWeek) || (day != currentDay)) {
-      char dateStr[22];
       if (settingsController.GetClockType() == Controllers::Settings::ClockType::H24) {
-        sprintf(dateStr, "%s %d %s %d", dateTimeController.DayOfWeekShortToString(), day, dateTimeController.MonthShortToString(), year);
+        lv_label_set_text_fmt(label_date, "%s %d %s %d", dateTimeController.DayOfWeekShortToString(), day, dateTimeController.MonthShortToString(), year);
       } else {
-        sprintf(dateStr, "%s %s %d %d", dateTimeController.DayOfWeekShortToString(), dateTimeController.MonthShortToString(), day, year);
+        lv_label_set_text_fmt(label_date, "%s %s %d %d", dateTimeController.DayOfWeekShortToString(), dateTimeController.MonthShortToString(), day, year);
       }
-      lv_label_set_text(label_date, dateStr);
       lv_obj_align(label_date, lv_scr_act(), LV_ALIGN_CENTER, 0, 60);
 
       currentYear = year;

src/displayapp/screens/WatchFaceDigital.h

@@ -35,10 +35,8 @@ namespace Pinetime {
 
         bool Refresh() override;
 
-        void OnObjectEvent(lv_obj_t* pObj, lv_event_t i);
-
       private:
-        char displayedChar[5];
+        char displayedChar[5] {};
 
         uint16_t currentYear = 1970;
         Pinetime::Controllers::DateTime::Months currentMonth = Pinetime::Controllers::DateTime::Months::Unknown;
@@ -63,7 +61,6 @@ namespace Pinetime {
         lv_obj_t* batteryPlug;
         lv_obj_t* heartbeatIcon;
         lv_obj_t* heartbeatValue;
-        lv_obj_t* heartbeatBpm;
         lv_obj_t* stepIcon;
         lv_obj_t* stepValue;
         lv_obj_t* notificationIcon;