Christopher Stillwell asked 5 years ago
I’m using the “LoRa Long Range Sensor Monitoring and Data Logging” Project as a reference. When I tried to create the microSD initialization and have the arduino IDE verify the code, I’m getting an error that ‘writeFile’ was not declared in the scope. I’m just a bit confused because I thought FS.h or SD.h would have the function included. I’m using the ESP32 Huzzah if that is any help.
#include <SPI.h>
#include "FS.h"
#include "SD.h"
#define SD_CS 16
void setup(){
Serial.begin(115200);
SD.begin(SD_CS);
if(!SD.begin(SD_CS)){
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE){
Serial.println("No SD card attached");
return;
}
Serial.println("Initializing SD card...");
if(!SD.begin(SD_CS)){
Serial.println("ERROR - SD card initialization failed!");
return;
}
File file = SD.open("/data.txt");
if(!file){
Serial.println("File does not exisit");
Serial.println("Creating file...");
writeFile(SD,"/data.txt","Sensor_ID,User_ID,Session,Time,gx,gy,gz,ax,ay,az,mx,my,mz\n");
}
else{
Serial.println("File already exists");
}
file.close();
}
Steve Mercer answered 5 years ago
I don’t know the libraries (You did add those libraries with the library manager, right?) you are using but I would have based my project on ESP32-CAM Take Photo and Save to MicroSD Card. Perhaps try that and see how you get on.
Sara Santos Staff answered 5 years ago
Hi.
You need to include the actual writeFile() function in your code. Add the following lines before the setup.
void writeFile(fs::FS &fs, const char * path, const char * message) {
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if(!file) {
Serial.println("Failed to open file for writing");
return;
}
if(file.print(message)) {
Serial.println("File written");
} else {
Serial.println("Write failed");
}
file.close();
}
Let me know if this solves your issue.
Regards,
Sara