one can write a struct directly into a SPIFS/ FFAT file like this:
* EXAMPLE READING AND WRITING A C++ STRUCT TO A FILE
*/
#include <FS.h>
#include <SPIFFS.h>
typedef struct {
char someString[10];
float someFloat;
} MyStruct;
MyStruct myStruct = { "test test",1.7 };
void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
if(!SPIFFS.begin()){
Serial.println("Card Mount Failed");
return;
}
strncpy( myStruct.someString, "testtesttest", sizeof(myStruct.someString) );
File myFile = SPIFFS.open("/somefile.txt", FILE_WRITE);
myFile.write((byte *)&myStruct, sizeof(myStruct));
myFile.close();
}
void loop() {
// put your main code here, to run repeatedly:
File myFile = SPIFFS.open("/somefile.txt", FILE_WRITE);
myFile.read((byte *)&myStruct, sizeof(myStruct));
myFile.close();
Serial.printf( "read: %s, %.2f\n", myStruct.someString, myStruct.someFloat );
delay(1000);
}
the code above is available on this Github Gist.
For more info have a look at these repositories on Github:
https://github.com/aeonSolutions/PCB-Prototyping-Catalogue
https://github.com/aeonSolutions/aeonlabs-open-software-catalogue
