From 8b7f2a14b65f1c85d9b97682e76691332505db15 Mon Sep 17 00:00:00 2001
From: Thomas Basler <thomas@familie-basler.net>
Date: Sun, 10 Apr 2022 16:57:24 +0200
Subject: [PATCH] Added configuration handling

---
 include/Configuration.h | 22 +++++++++++++++++
 src/Configuration.cpp   | 53 +++++++++++++++++++++++++++++++++++++++++
 src/main.cpp            | 21 ++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 include/Configuration.h
 create mode 100644 src/Configuration.cpp

diff --git a/include/Configuration.h b/include/Configuration.h
new file mode 100644
index 0000000..e3dd74f
--- /dev/null
+++ b/include/Configuration.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <Arduino.h>
+
+#define CONFIG_FILENAME "/config.bin"
+#define CONFIG_VERSION 0x00010000 // 0.1.0
+
+struct CONFIG_T {
+    uint32_t Cfg_Version;
+    uint Cfg_SaveCount;
+};
+
+class ConfigurationClass {
+public:
+    void init();
+    bool read();
+    bool write();
+    void migrate();
+    CONFIG_T& get();
+};
+
+extern ConfigurationClass Configuration;
\ No newline at end of file
diff --git a/src/Configuration.cpp b/src/Configuration.cpp
new file mode 100644
index 0000000..1efbf8d
--- /dev/null
+++ b/src/Configuration.cpp
@@ -0,0 +1,53 @@
+#include "Configuration.h"
+#include <LittleFS.h>
+
+CONFIG_T config;
+
+void ConfigurationClass::init()
+{
+    memset(&config, 0x0, sizeof(config));
+    config.Cfg_SaveCount = 0;
+    config.Cfg_Version = CONFIG_VERSION;
+}
+
+bool ConfigurationClass::write()
+{
+    File f = LITTLEFS.open(CONFIG_FILENAME, "w");
+    if (!f) {
+        return false;
+    }
+    config.Cfg_SaveCount++;
+    uint8_t* bytes = (uint8_t*)&config;
+    for (unsigned int i = 0; i < sizeof(CONFIG_T); i++) {
+        f.write(bytes[i]);
+    }
+    f.close();
+    return true;
+}
+
+bool ConfigurationClass::read()
+{
+    File f = LITTLEFS.open(CONFIG_FILENAME, "r");
+    if (!f) {
+        return false;
+    }
+    uint8_t* bytes = (uint8_t*)&config;
+    for (unsigned int i = 0; i < sizeof(CONFIG_T); i++) {
+        bytes[i] = f.read();
+    }
+    f.close();
+    return true;
+}
+
+void ConfigurationClass::migrate()
+{
+    config.Cfg_Version = CONFIG_VERSION;
+    write();
+}
+
+CONFIG_T& ConfigurationClass::get()
+{
+    return config;
+}
+
+ConfigurationClass Configuration;
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 3ed2e11..754cd77 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,3 +1,4 @@
+#include "Configuration.h"
 #include "defaults.h"
 #include <Arduino.h>
 #include <LittleFS.h>
@@ -18,6 +19,26 @@ void setup()
     } else {
         Serial.println(F("done"));
     }
+
+    // Read configuration values
+    Serial.print(F("Reading configuration... "));
+    if (!Configuration.read()) {
+        Serial.print(F("initializing... "));
+        Configuration.init();
+        if (Configuration.write()) {
+            Serial.print(F("written... "));
+        } else {
+            Serial.print(F("failed... "));
+        }
+    }
+    if (Configuration.get().Cfg_Version != CONFIG_VERSION) {
+        Serial.print(F("migrated... "));
+        Configuration.migrate();
+    }
+    Serial.println(F("done"));
+
+    // Initialize WiFi
+    Serial.print(F("Initialize WiFi... "));
 }
 
 void loop()