basic json config save and load from and to LittleFS works

Arduino/CanGrow/CanGrow.ino

@@ -26,7 +26,7 @@
  * THE SOFTWARE.
  *
  */
- 
+
 
 /*
  *  Libraries include
@@ -125,6 +125,14 @@ void setup() {
   LFS_init();
   if(existFile(CANGROW_CFG)) {
     readFile(CANGROW_CFG);
+    Serial.printf(":: config.GrowName: %s \n", config.GrowName);
+    Serial.printf(":: load config.json \n");
+    loadConfig(config);
+    Serial.printf(":: config.GrowName: %s \n", config.GrowName);
+    Serial.print(":: config.DoG: ");
+    Serial.println(config.DoG);
+    
+    
   } else {
     writeFile(CANGROW_CFG, "{}");
   }
@@ -158,6 +166,16 @@ void setup() {
 */
 }
 
+bool alrdySaved = false;
+
 void loop() {
-  
+  if((digitalRead(PinWIPE) != PinWIPE_default) && (alrdySaved == false)) {
+    Serial.println(":: [LOOP] PinWIPE is triggered, saving config.json");
+    saveConfig(config);
+    alrdySaved = true;
+  } else if(  (digitalRead(PinWIPE) != PinWIPE_default) && (alrdySaved == true)    ) {
+    alrdySaved = true;
+  } else {
+    alrdySaved = false;
+  }
 }

Arduino/CanGrow/cangrow.sh

@@ -4,8 +4,8 @@
 test -z $TTY && TTY="/dev/ttyUSB0"
 test -z $IP && IP="192.168.4.20"
 test -z $VER && VER="0.2-dev"
-test -z $BOARD && BOARD="esp8266:esp8266:d1_mini_clone"
+#test -z $BOARD && BOARD="esp8266:esp8266:d1_mini_clone"
-#test -z $BOARD && BOARD="esp32:esp32:d1_mini32"
+test -z $BOARD && BOARD="esp32:esp32:d1_mini32"
 
 BUILD="$(git rev-parse --short HEAD)-$(echo $BOARD | cut -d : -f1)-$(date '+%Y%m%d%H%M%S')"
 

Arduino/CanGrow/include/CanGrow.h

@@ -29,4 +29,9 @@
 
 #include "CanGrow_Version.h"
 
-#define CANGROW_CFG "/config.json"
+struct Config {
+  char GrowName[64];
+  int DoG;
+};
+
+Config config;

Arduino/CanGrow/include/CanGrow_LittleFS.h

@@ -27,6 +27,8 @@
  *
  */
 
+#define CANGROW_CFG "/config.json"
+
 // LittleFS auto format
 #define FORMAT_LITTLEFS_IF_FAILED true
 
@@ -96,8 +98,11 @@ void readFile(const char *path) {
   }
 
   Serial.printf(":: [LittleFS] file content: %s\n", path);
+  Serial.println("----");
   while (file.available()) { Serial.write(file.read()); }
-  file.close();  
+  Serial.println("\n----");
+
+  file.close();
 }
 
 void writeFile(const char *path, const char *message) {
@@ -119,7 +124,7 @@ void writeFile(const char *path, const char *message) {
   } else {
     Serial.printf(":: [LittleFS] writing file FAILED: %s\n", path);
   }
-  delay(2000);  // Make sure the CREATE and LASTWRITE times are different
+  //delay(2000);  // Make sure the CREATE and LASTWRITE times are different
   file.close();
 }
 
@@ -142,6 +147,64 @@ void deleteFile(const char *path) {
   }
 }
 
+// https://arduinojson.org/v7/example/config/
+void loadConfig(Config& config) {
+  #ifdef ESP8266
+  File file = LittleFS.open(CANGROW_CFG, "r");
+  #endif
+  
+  #ifdef ESP32
+  fs::FS &fs = LittleFS;
+  File file = fs.open(CANGROW_CFG);
+  #endif
+  
+  JsonDocument doc;
+  // Deserialize the JSON document
+  DeserializationError error = deserializeJson(doc, file);
+  if (error)
+    Serial.printf(":: [LittleFS] FAILED to load config: %s\n", CANGROW_CFG);
+    
+  // Copy values from the JsonDocument to the Config
+  strlcpy(config.GrowName,
+          doc["GrowName"] | "CanGrow",
+          sizeof(config.GrowName));
+  config.DoG = doc["DoG"] | 3;
+
+  // Close the file (Curiously, File's destructor doesn't close the file)
+  file.close();
+}
+
+void saveConfig(Config& config) {
+  #ifdef ESP8266
+  File file = LittleFS.open(CANGROW_CFG, "w");
+  #endif
+  
+  #ifdef ESP32
+  fs::FS &fs = LittleFS;
+  File file = fs.open(CANGROW_CFG, FILE_WRITE);
+  #endif
+  
+  if (!file) {
+    Serial.printf(":: [LittleFS] FAILED to open configfile for writing: %s\n", CANGROW_CFG);
+    return;
+  } else {
+    Serial.printf(":: [LittleFS] opened for writing %s\n", CANGROW_CFG);
+  }
+  
+  JsonDocument doc;
+  
+  doc["GrowName"] = config.GrowName;
+  doc["DoG"] = config.DoG + 1 ;
+  
+  // Serialize JSON to file
+  if (serializeJson(doc, file) == 0) {
+    Serial.printf(":: [LittleFS] FAILED to write configfile: %s\n", CANGROW_CFG);
+  } else {
+    Serial.printf(":: [LittleFS] successfully written %s\n", CANGROW_CFG);
+  }
+  
+  file.close();
+}
 
 ///*
  //* ESP8266 functions