more build info

Now on par with Python implementation

.clang-format

@@ -0,0 +1,179 @@
+---
+Language:        Cpp
+# BasedOnStyle:  LLVM
+AccessModifierOffset: -2
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: None
+AlignConsecutiveMacros: None
+AlignConsecutiveAssignments: None
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+AlignConsecutiveDeclarations: None
+AlignEscapedNewlines: Right
+AlignOperands:   Align
+AlignTrailingComments: true
+AllowAllArgumentsOnNextLine: true
+AllowAllConstructorInitializersOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortEnumsOnASingleLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: All
+AllowShortLambdasOnASingleLine: All
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: MultiLine
+AttributeMacros:
+  - __capability
+BinPackArguments: true
+BinPackParameters: true
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: Never
+  AfterEnum:       false
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+  AfterNamespace:  false
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+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+BreakBeforeBinaryOperators: None
+BreakBeforeConceptDeclarations: true
+BreakBeforeBraces: Attach
+BreakBeforeInheritanceComma: false
+BreakInheritanceList: BeforeColon
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializersBeforeComma: false
+BreakConstructorInitializers: BeforeColon
+BreakAfterJavaFieldAnnotations: false
+BreakStringLiterals: true
+ColumnLimit:     80
+CommentPragmas:  '^ IWYU pragma:'
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+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+ConstructorInitializerIndentWidth: 4
+ContinuationIndentWidth: 4
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+DeriveLineEnding: true
+DerivePointerAlignment: false
+DisableFormat:   false
+EmptyLineAfterAccessModifier: Never
+EmptyLineBeforeAccessModifier: LogicalBlock
+ExperimentalAutoDetectBinPacking: false
+FixNamespaceComments: true
+ForEachMacros:
+  - foreach
+  - Q_FOREACH
+  - BOOST_FOREACH
+IfMacros:
+  - KJ_IF_MAYBE
+IncludeBlocks:   Preserve
+IncludeCategories:
+  - Regex:           '^"(llvm|llvm-c|clang|clang-c)/'
+    Priority:        2
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '^(<|"(gtest|gmock|isl|json)/)'
+    Priority:        3
+    SortPriority:    0
+    CaseSensitive:   false
+  - Regex:           '.*'
+    Priority:        1
+    SortPriority:    0
+    CaseSensitive:   false
+IncludeIsMainRegex: '(Test)?$'
+IncludeIsMainSourceRegex: ''
+IndentAccessModifiers: false
+IndentCaseLabels: false
+IndentCaseBlocks: false
+IndentGotoLabels: true
+IndentPPDirectives: None
+IndentExternBlock: AfterExternBlock
+IndentRequires:  false
+#IndentWidth:     2
+IndentWidth:     4
+IndentWrappedFunctionNames: false
+InsertTrailingCommas: None
+JavaScriptQuotes: Leave
+JavaScriptWrapImports: true
+KeepEmptyLinesAtTheStartOfBlocks: true
+LambdaBodyIndentation: Signature
+MacroBlockBegin: ''
+MacroBlockEnd:   ''
+MaxEmptyLinesToKeep: 1
+NamespaceIndentation: None
+ObjCBinPackProtocolList: Auto
+ObjCBlockIndentWidth: 2
+ObjCBreakBeforeNestedBlockParam: true
+ObjCSpaceAfterProperty: false
+ObjCSpaceBeforeProtocolList: true
+PenaltyBreakAssignment: 2
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+PPIndentWidth:   -1
+ReferenceAlignment: Pointer
+ReflowComments:  true
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+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCaseColon: false
+SpaceBeforeCpp11BracedList: false
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+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceAroundPointerQualifiers: Default
+SpaceBeforeRangeBasedForLoopColon: true
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+SpacesInAngles:  Never
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+SpacesInLineCommentPrefix:
+  Minimum:         1
+  Maximum:         -1
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+SpaceBeforeSquareBrackets: false
+BitFieldColonSpacing: Both
+Standard:        Latest
+StatementAttributeLikeMacros:
+  - Q_EMIT
+StatementMacros:
+  - Q_UNUSED
+  - QT_REQUIRE_VERSION
+TabWidth:        8
+UseCRLF:         false
+UseTab:          Never
+WhitespaceSensitiveMacros:
+  - STRINGIZE
+  - PP_STRINGIZE
+  - BOOST_PP_STRINGIZE
+  - NS_SWIFT_NAME
+  - CF_SWIFT_NAME
+...
+

.gitignore

@@ -0,0 +1 @@
+build/

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "modules/pico-onewire"]
+	path = modules/pico-onewire
+	url = https://github.com/adamboardman/pico-onewire.git

.vscode/.cortex-debug.peripherals.state.json

@@ -0,0 +1 @@
+[]

.vscode/.cortex-debug.registers.state.json

@@ -0,0 +1 @@
+[]

.vscode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+  "configurations": [
+    {
+      "name": "Linux",
+      "includePath": [
+        "${workspaceFolder}/**",
+        "${env:PICO_SDK_PATH}/**"
+      ],
+      "defines": [],
+      "compilerPath": "/usr/bin/arm-none-eabi-gcc",
+      "cStandard": "gnu17",
+      "cppStandard": "gnu++14",
+      "intelliSenseMode": "linux-gcc-arm",
+      "configurationProvider" : "ms-vscode.cmake-tools"
+    }
+  ],
+  "version": 4
+}

.vscode/extensions.json

@@ -0,0 +1,7 @@
+{
+  "recommendations": [
+    "marus25.cortex-debug",
+    "ms-vscode.cmake-tools",
+    "ms-vscode.cpptools"
+  ]
+}

.vscode/launch.json

@@ -0,0 +1,31 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Cortex Debug",
+      "cwd": "${workspaceRoot}",
+      "executable": "${command:cmake.launchTargetPath}",
+      "request": "launch",
+      "type": "cortex-debug",
+      "servertype": "openocd",
+      "gdbPath" : "arm-none-eabi-gdb",
+      "device": "RP2040",
+      //"showDevDebugOutput": "parsed",
+      "configFiles": [
+        "interface/picoprobe.cfg",
+        "target/rp2040.cfg"
+        ],
+      "svdFile": "${env:PICO_SDK_PATH}/src/rp2040/hardware_regs/rp2040.svd",
+      "runToEntryPoint": "main",
+      // Give restart the same functionality as runToMain
+      //"postRestartCommands": [
+      //    "break main",
+      //    "continue"
+      //],
+      "searchDir": ["${env:HOME}/src/openocd/tcl"],
+    }
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,20 @@
+{
+  "cmake.configureOnOpen": false,
+  "cmake.buildBeforeRun": true,
+  "cmake.statusbar.advanced": {
+    "debug" : {
+      "visibility": "hidden"
+              },    "launch" : {
+      "visibility": "hidden"
+               },
+    "build" : {
+      "visibility": "hidden"
+               },
+    "buildTarget" : {
+      "visibility": "hidden"
+               },
+     },
+    "cortex-debug.openocdPath": "${env:HOME}/src/openocd/src/openocd",
+    "cmake.generator": "Unix Makefiles",
+    "C_Cpp.clang_format_fallbackStyle": "LLVM",
+}

CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 20)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-volatile")
+
+# Initialise pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+set(PICO_SDK_PATH "/usr/share/pico-sdk")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include("cmake/pico_sdk_import.cmake")
+
+project(gbmanager VERSION "1.0.0" LANGUAGES C CXX ASM)
+
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+add_subdirectory(modules/pico-onewire)
+add_subdirectory(src)

README.md

@@ -20,10 +20,27 @@ Die Kosten für die Bauteile belaufen sich auf ca. 23 €.
 Die Software ist derzeit noch rudimentär gehalten. Die Temperatur wird perodisch ausgelesen und die Heizmatte entsprechend der Zieltemperatur an- oder ausgeschaltet. Über Interrupts wird auf drei Drucktaster reagiert. Dadurch können (derzeit) die Zieltemperatur eingestellt sowie die Heizungsregelung (de)aktiviert werden.
 
 ### Verwendete Bibliotheken
-Für die Ansteuerung des LCD wird `rpi-pico-i2c-lcd` von _T-622_ ([Github](https://github.com/t-622/rpi-pico-i2c-lcd)) verwendet, das wiederum auf `python_lcd` von _dhylands_ ([Github](https://github.com/dhylands/python_lcd)) basiert. Letzteres steht unter der MIT-Lizenz. `rpi-pico-i2c-lcd` ist ohne Lizenzangabe. Die entspechenden Dateien liegen der Einfachheit halber im `lib` Unterverzeichnis.
+Die C++-Implementierung, die bei Bedarf weiterentwickelt wird, verwendet zur Ansteuerung des Temperatursensors die `pico-onewire` Bibliothek von Adam Boardman ([Github](https://github.com/adamboardman/pico-onewire)).
+
+_Hinweis_: Die ältere Python-Implementierung ist zu Dokumentationszwecken noch im Unterverzeichnis "micropython" zu finden. Wahrscheinlich wird diese nicht mehr weiterentwickelt.
+Für die Ansteuerung des LCD wird `rpi-pico-i2c-lcd` von _T-622_ ([Github](https://github.com/t-622/rpi-pico-i2c-lcd)) verwendet, das wiederum auf `python_lcd` von _dhylands_ ([Github](https://github.com/dhylands/python_lcd)) basiert. Die entspechenden Dateien liegen der Einfachheit halber im `lib` Unterverzeichnis.
 
 ### Installation
-Am einfachsten ist es, mittels [Thonny](https://thonny.org/) die Datei `main.py` sowie den `lib`-Ordner ins Hauptverzichnis des Picos zu kopieren. Auf dem Pico muss natürlich MicroPython installiert sein. Fertig.
+Zunächst wird das Repository geklont sowie die Submodules initialisiert:
+```
+$ git clone https://git.rustysoft.de/martin/gbmanager.git
+$ cd gbmanager
+$ git submodule init
+$ git submodule update 
+```
+
+Mit den folgenden Kommandos wird die Firmware compiliert:
+```
+$ mkdir build && cd build
+$ cmake -DCMAKE_BUILD_TYPE=Release ..
+$ make
+```
+Im src-Unterverzeichnis (des build-Verzeichnisses!) ist nun UF2-Datei `gbmanager.uf2` vorhanden. Diese muss nun nur noch auf den Pico kopiert werden.
 
 # Aufbau
 Die zum Aufbau notwendigen Informationen bzw. Dateien befinden sich in diesem Repository. 

cmake/pico_sdk_import.cmake

@@ -0,0 +1,73 @@
+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})

modules/pico-onewire

@@ -0,0 +1 @@
+Subproject commit d5af2a1e1d81c3cb21805e332c8185607ee74b1d

src/CMakeLists.txt

@@ -0,0 +1,34 @@
+configure_file(${CMAKE_CURRENT_LIST_DIR}/config.h.in ${PROJECT_BINARY_DIR}/src/config.h)
+
+set(SOURCES
+    gbmanager.cpp
+    lcd.cpp
+    relais.cpp
+)
+
+# Add executable. Default name is the project name, version 0.1
+add_executable(${CMAKE_PROJECT_NAME} ${SOURCES})
+
+pico_set_program_name(${CMAKE_PROJECT_NAME} "gbmanager")
+pico_set_program_version(${CMAKE_PROJECT_NAME} ${PROJECT_VERSION})
+
+if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    pico_enable_stdio_uart(${CMAKE_PROJECT_NAME} 1)
+    pico_enable_stdio_usb(${CMAKE_PROJECT_NAME} 0)
+else()
+    pico_enable_stdio_uart(${CMAKE_PROJECT_NAME} 0)
+    pico_enable_stdio_usb(${CMAKE_PROJECT_NAME} 0)
+endif()
+
+pico_generate_pio_header(${CMAKE_PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR}/ds18b20.pio)
+
+# Add the standard library to the build
+target_link_libraries(${CMAKE_PROJECT_NAME} pico_stdlib pico_one_wire)
+
+# Add any user requested libraries
+target_link_libraries(${CMAKE_PROJECT_NAME}
+    hardware_i2c
+    hardware_gpio
+)
+
+pico_add_extra_outputs(${CMAKE_PROJECT_NAME})

src/config.h.in

@@ -0,0 +1,6 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#cmakedefine PROJECT_VERSION "@PROJECT_VERSION@"
+
+#endif

src/ds18b20.cpp

@@ -0,0 +1,73 @@
+#include "ds18b20.h"
+
+DS18B20::DS18B20(PIO pio, uint8_t gpio) : pio{pio}, gpio{gpio} {
+    uint offset = pio_add_program(pio, &ds18b20_program);
+    stateMachineIndex = pio_claim_unused_sm(pio, true);
+    pio_gpio_init(pio, gpio);
+    pio_sm_config c = ds18b20_program_get_default_config(offset);
+    sm_config_set_clkdiv_int_frac(&c, 255, 0);
+    sm_config_set_set_pins(&c, gpio, 1);
+    sm_config_set_out_pins(&c, gpio, 1);
+    sm_config_set_in_pins(&c, gpio);
+    sm_config_set_in_shift(&c, true, true, 8);
+    pio_sm_init(pio0, stateMachineIndex, offset, &c);
+    pio_sm_set_enabled(pio0, stateMachineIndex, true);
+}
+
+void DS18B20::writeBytes(uint8_t bytes[], int len) {
+    pio_sm_put_blocking(pio, stateMachineIndex, 250);
+    pio_sm_put_blocking(pio, stateMachineIndex, len - 1);
+    for (int i = 0; i < len; i++) {
+        pio_sm_put_blocking(pio, stateMachineIndex, bytes[i]);
+    }
+}
+
+void DS18B20::readBytes(uint8_t bytes[], int len) {
+    pio_sm_put_blocking(pio, stateMachineIndex, 0);
+    pio_sm_put_blocking(pio, stateMachineIndex, len - 1);
+    for (int i = 0; i < len; i++) {
+        bytes[i] = pio_sm_get_blocking(pio, stateMachineIndex) >> 24;
+    }
+}
+
+void DS18B20::convert() {
+    uint8_t d[2] = {0xCC, 0x44};
+    writeBytes(d, 2);
+    sleep_ms(750);
+}
+
+uint8_t DS18B20::crc8(uint8_t *data, uint8_t len) {
+    uint8_t i;
+    uint8_t j;
+    uint8_t temp;
+    uint8_t databyte;
+    uint8_t crc = 0;
+
+    for (i = 0; i < len; i++) {
+        databyte = data[i];
+        for (j = 0; j < 8; j++) {
+            temp = (crc ^ databyte) & 0x01;
+            crc >>= 1;
+            if (temp)
+                crc ^= 0x8C;
+            databyte >>= 1;
+        }
+    }
+
+    return crc;
+}
+
+float DS18B20::getTemperature() {
+    uint8_t d[2] = {0xCC, 0xBE};
+    writeBytes(d, 2);
+    uint8_t data[9];
+    readBytes(data, 9);
+    uint8_t crc = crc8(data, 9);
+    if (crc != 0)
+        return -2000;
+    int t1 = data[0];
+    int t2 = data[1];
+    int16_t temp1 = (t2 << 8 | t1);
+    volatile float temp = (float)temp1 / 16;
+    return temp;
+}

src/ds18b20.h

@@ -0,0 +1,23 @@
+#ifndef DS18B20_H
+#define DS18B20_H
+
+#include "ds18b20.pio.h"
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+
+class DS18B20 {
+  public:
+    DS18B20(PIO pio, uint8_t gpio);
+    float getTemperature();
+    void convert();
+
+  private:
+    uint8_t crc8(uint8_t *data, uint8_t len);
+    void writeBytes(uint8_t bytes[], int len);
+    void readBytes(uint8_t bytes[], int len);
+    PIO pio;
+    uint8_t gpio;
+    uint stateMachineIndex;
+};
+
+#endif

src/ds18b20.pio

@@ -0,0 +1,44 @@
+
+.program ds18b20 
+.wrap_target
+again:
+  pull block
+  mov x, osr
+  jmp !x, read
+
+write:  set pindirs, 1 
+  set pins, 0  
+loop1: 
+    jmp x--,loop1
+set pindirs, 0 [31]
+wait 1 pin 0 [31]
+
+  pull block
+  mov x, osr
+bytes1:
+   pull block
+  set y, 7    
+  set pindirs, 1 
+bit1:
+  set pins, 0 [1]
+  out pins,1 [31]
+    set pins, 1 [20]
+   jmp y--,bit1
+jmp x--,bytes1
+
+set pindirs, 0 [31]
+jmp again
+
+read:
+  pull block
+  mov x, osr
+bytes2:
+  set y, 7
+bit2:
+  set pindirs, 1 
+  set pins, 0 [1]  
+  set pindirs, 0 [5]
+  in pins,1 [10]   
+jmp y--,bit2
+jmp x--,bytes2
+.wrap

src/gbmanager.cpp

@@ -0,0 +1,125 @@
+#include <iomanip>
+#include <iostream>
+#include <sstream>
+
+#include "../modules/pico-onewire/api/one_wire.h"
+#include "hardware/i2c.h"
+#include "pico/stdlib.h"
+
+#include "config.h"
+#include "lcd.h"
+#include "relais.h"
+
+// GPIOs used
+constexpr uint I2C_SDA_PIN = 26;
+constexpr uint I2C_SCL_PIN = 27;
+constexpr uint DS18B20_PIN = 28;
+constexpr uint RELAIS_PIN = 18;
+constexpr uint BUTTON_1_PIN = 17;
+constexpr uint BUTTON_2_PIN = 16;
+constexpr uint BUTTON_3_PIN = 15;
+
+// Custom chars for the LCD
+constexpr char CUSTOM_CHAR_DEG = 0xDF;
+constexpr char CUSTOM_CHAR_AE = 0xE1;
+
+// Global variables which have to be accessed by callback function
+bool isSystemOn = false;
+float temp_tgt{28.0};
+absolute_time_t lastPressed = get_absolute_time();
+
+using std::string;
+
+void buttonPressedCallback(uint gpio, uint32_t events) {
+    if (absolute_time_diff_us(lastPressed, get_absolute_time()) < 750000) {
+        return;
+    } else {
+        lastPressed = get_absolute_time();
+    }
+
+    switch (gpio) {
+    case BUTTON_1_PIN:
+        temp_tgt -= 0.5;
+        break;
+    case BUTTON_2_PIN:
+        temp_tgt += 0.5;
+        break;
+    case BUTTON_3_PIN:
+        isSystemOn = !isSystemOn;
+        break;
+    }
+}
+
+int main() {
+    // Enable UART so we can print status output
+    stdio_init_all();
+
+    // Initialize the LCD
+    auto myLCD = LCD(i2c1, I2C_SDA_PIN, I2C_SCL_PIN);
+    myLCD.clear();
+
+    // Initialize the temp sensor
+    One_wire oneWire(DS18B20_PIN);
+    oneWire.init();
+    rom_address_t address{};
+    oneWire.single_device_read_rom(address);
+
+    // Initialize the relais
+    Relais relais(RELAIS_PIN);
+
+    // Initialize the Buttons
+    gpio_set_irq_enabled_with_callback(BUTTON_1_PIN, GPIO_IRQ_EDGE_FALL, true,
+                                       &buttonPressedCallback);
+    gpio_set_irq_enabled_with_callback(BUTTON_2_PIN, GPIO_IRQ_EDGE_FALL, true,
+                                       &buttonPressedCallback);
+    gpio_set_irq_enabled_with_callback(BUTTON_3_PIN, GPIO_IRQ_EDGE_FALL, true,
+                                       &buttonPressedCallback);
+
+    float temp_act{0};
+    float temp_diff{0.5};
+    std::stringstream lcdText{};
+    bool isHeating = false;
+    string heatInfo{""};
+    string systemInfo{""};
+
+    lcdText << " G" << CUSTOM_CHAR_AE << "rbox Manager\n (Ver. "
+            << PROJECT_VERSION << ")";
+    myLCD.sendString(lcdText.str());
+    sleep_ms(3000);
+
+    while (true) {
+        absolute_time_t start = get_absolute_time();
+        oneWire.convert_temperature(address, true, false);
+        temp_act = oneWire.temperature(address);
+
+        if (isSystemOn && temp_act < temp_tgt - temp_diff) {
+            isHeating = true;
+        } else if (isSystemOn && temp_act > temp_tgt + temp_diff) {
+            isHeating = false;
+        } else if (!isSystemOn) {
+            isHeating = false;
+        }
+        isHeating ? heatInfo = ">H<" : heatInfo = "   ";
+        isSystemOn ? systemInfo = "ON " : systemInfo = "OFF";
+
+        relais.activate(isHeating);
+
+        lcdText.str("");
+        lcdText.clear();
+        lcdText.precision(4);
+        lcdText << "ACT: " << temp_act << CUSTOM_CHAR_DEG << "C " << heatInfo
+                << "\n"
+                << "TGT: " << temp_tgt << CUSTOM_CHAR_DEG << "C " << systemInfo;
+
+        myLCD.setCursor(0, 0);
+        myLCD.sendString(lcdText.str());
+
+        absolute_time_t stop = get_absolute_time();
+
+        int64_t duration_ms = absolute_time_diff_us(start, stop) / 1000;
+        int64_t timeToSleep = 1000 - duration_ms;
+
+        if (timeToSleep > 0)
+            sleep_ms(timeToSleep);
+    }
+}

src/lcd.cpp

@@ -0,0 +1,98 @@
+#include "lcd.h"
+
+// commands
+constexpr int LCD_CLEARDISPLAY = 0x01;
+constexpr int LCD_RETURNHOME = 0x02;
+constexpr int LCD_ENTRYMODESET = 0x04;
+constexpr int LCD_DISPLAYCONTROL = 0x08;
+constexpr int LCD_CURSORSHIFT = 0x10;
+constexpr int LCD_FUNCTIONSET = 0x20;
+constexpr int LCD_SETCGRAMADDR = 0x40;
+constexpr int LCD_SETDDRAMADDR = 0x80;
+
+// flags for display entry mode
+constexpr int LCD_ENTRYSHIFTINCREMENT = 0x01;
+constexpr int LCD_ENTRYLEFT = 0x02;
+
+// flags for display and cursor control
+constexpr int LCD_BLINKON = 0x01;
+constexpr int LCD_CURSORON = 0x02;
+constexpr int LCD_DISPLAYON = 0x04;
+
+// flags for function set
+constexpr int LCD_5x10DOTS = 0x04;
+constexpr int LCD_2LINE = 0x08;
+constexpr int LCD_8BITMODE = 0x10;
+
+constexpr int LCD_BACKLIGHT = 0x08;
+constexpr int LCD_ENABLE_BIT = 0x04;
+
+LCD::LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
+         const uint8_t i2c_addr, uint8_t num_cols, uint8_t num_lines)
+    : i2c{i2c}, i2c_addr{i2c_addr}, num_cols{num_cols}, num_lines{num_lines} {
+    i2c_init(i2c1, 100 * 1000);
+    gpio_set_function(gpio_sda, GPIO_FUNC_I2C);
+    gpio_set_function(gpio_scl, GPIO_FUNC_I2C);
+    gpio_pull_up(gpio_sda);
+    gpio_pull_up(gpio_scl);
+
+    sendByte(0x03, Mode::COMMAND);
+    sendByte(0x03, Mode::COMMAND);
+    sendByte(0x03, Mode::COMMAND);
+    sendByte(0x02, Mode::COMMAND);
+
+    sendByte(LCD_ENTRYMODESET | LCD_ENTRYLEFT, Mode::COMMAND);
+    sendByte(LCD_FUNCTIONSET | LCD_2LINE, Mode::COMMAND);
+    sendByte(LCD_DISPLAYCONTROL | LCD_DISPLAYON, Mode::COMMAND);
+    clear();
+}
+
+// Go to location on LCD
+void LCD::setCursor(int line, int position) {
+    int val = (line == 0) ? 0x80 + position : 0xC0 + position;
+    sendByte(val, Mode::COMMAND);
+    cursor_x = line;
+    cursor_y = position;
+}
+
+void LCD::sendChar(char val) { sendByte(val, Mode::CHARACTER); }
+
+void LCD::sendString(const std::string &str) {
+    for (const char &c : str) {
+        if (c == '\n') {
+            cursor_y++;
+            setCursor(cursor_y, 0);
+        } else {
+            sendChar(c);
+            cursor_x++;
+        }
+    }
+}
+
+void LCD::clear() { sendByte(LCD_CLEARDISPLAY, Mode::COMMAND); }
+
+void LCD::i2cWriteByte(uint8_t val) {
+    i2c_write_blocking(i2c, i2c_addr, &val, 1, false);
+}
+
+void LCD::toggleEnable(uint8_t val) {
+    // Toggle enable pin on LCD display
+    // We cannot do this too quickly or things don't work
+    constexpr uint64_t DELAY_US = 600;
+    sleep_us(DELAY_US);
+    i2cWriteByte(val | LCD_ENABLE_BIT);
+    sleep_us(DELAY_US);
+    i2cWriteByte(val & ~LCD_ENABLE_BIT);
+    sleep_us(DELAY_US);
+}
+
+// The display is sent a byte as two separate nibble transfers
+void LCD::sendByte(uint8_t val, Mode mode) {
+    uint8_t high = static_cast<int>(mode) | (val & 0xF0) | LCD_BACKLIGHT;
+    uint8_t low = static_cast<int>(mode) | ((val << 4) & 0xF0) | LCD_BACKLIGHT;
+
+    i2cWriteByte(high);
+    toggleEnable(high);
+    i2cWriteByte(low);
+    toggleEnable(low);
+}

src/lcd.h

@@ -0,0 +1,33 @@
+#ifndef LCD_H
+#define LCD_H
+
+#include <string>
+
+#include "hardware/i2c.h"
+#include "pico/stdlib.h"
+
+class LCD {
+  public:
+    LCD(i2c_inst_t *i2c, const uint gpio_sda, const uint gpio_scl,
+        const uint8_t i2c_addr = 0x27, uint8_t num_cols = 16,
+        uint8_t num_lines = 2);
+
+    void sendString(const std::string &str);
+    void setCursor(int line, int position);
+    void clear();
+
+  private:
+    enum class Mode { COMMAND, CHARACTER };
+    void sendByte(uint8_t val, Mode mode);
+    void toggleEnable(uint8_t val);
+    void i2cWriteByte(uint8_t val);
+    void sendChar(char val);
+    i2c_inst_t *i2c;
+    uint8_t i2c_addr;
+    uint8_t num_cols;
+    uint8_t num_lines;
+    uint8_t cursor_x{0};
+    uint8_t cursor_y{0};
+};
+
+#endif

src/relais.cpp

@@ -0,0 +1,13 @@
+#include "relais.h"
+
+Relais::Relais(uint gpio) : gpio{gpio} {
+    gpio_init(gpio);
+    gpio_set_dir(gpio, GPIO_OUT);
+    off();
+}
+
+void Relais::activate(bool active) { gpio_put(gpio, !active); }
+
+void Relais::on() { activate(true); }
+
+void Relais::off() { activate(false); }

src/relais.h

@@ -0,0 +1,18 @@
+#ifndef RELAIS_H
+#define RELAIS_H
+
+#include "hardware/gpio.h"
+#include "pico/stdlib.h"
+
+class Relais {
+  public:
+    Relais(uint gpio);
+    void activate(bool active);
+    void on();
+    void off();
+
+  private:
+    uint gpio;
+};
+
+#endif