ESP32 Forum

Posted: **Sat Feb 13, 2021 12:16 pm**

I've got a microSD module adapter from the far east, and so far so good, and although it can create files using writeFile, it does not append messages. It returns true, i.e: message appended successfully but when you read the file on the computer or when ESP32 reads on reboot, it's blank.

This is how I call the function:

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char* sdFileName = "/v.ea";
if (appendFile(SD, sdFileName, "Heyy")) {
//success
} else { 
//failed
}

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I've even tried the writeFile function with

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file.seek(EOF)

but no luck. When calling appendFile for the first time, this appears:

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[W][sd_diskio.cpp:149] sdCommand(): token error [17] 0x17
Appending succesfully.

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When the appendFile is called for the second time, this appears in serial monitor:

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[W][sd_diskio.cpp:149] sdCommand(): token error [17] 0x17
[W][sd_diskio.cpp:149] sdCommand(): token error [17] 0x5
[W][sd_diskio.cpp:149] sdCommand(): token error [17] 0x5
[E][vfs_api.cpp:265] VFSFileImpl(): fopen(/sd/v.ea) failed
Appending failed.

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I am using two SPI devices: MFRC522, and before calling SD's functions, I do a

Code: Select all

digitalWrite(SD_SS, LOW)

to "enable" the SD functions till it completes its operations and returns back to

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HIGH

to disable it.

I've also tried both FAT32 and FAT, no success.
The example in SD(esp32) works fine - writing, appending, deleting, renaming, etc. all work well.

Thanks in advance.

UPDATE: seems like

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rfid.init();

is causing the problem. When I remove it, the appending works fine. As I said, I'm using two SPI with a 330Ohm resistor between MISO and microSD adapter module. Though, before SD functions, I use this function:

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void activate_SD() {
  rfid.PCD_SoftPowerDown();
  digitalWrite(MFRC522_SSPin, HIGH);
  digitalWrite(SDMOD_SS, LOW);
  if (DEBUG == 1) {
    Serial.println("SD is active.");
  }
}

Then after SD operations are completed, I use this:

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void activate_RFID() {
  rfid.PCD_SoftPowerUp();
  rfid.PCD_Init();
  digitalWrite(SDMOD_SS, HIGH);
  digitalWrite(MFRC522_SSPin, LOW);
  if (DEBUG == 1) {
    Serial.println("RFID is active.");
  }
}

But it doesn't help.

ESP32 Forum

ESP32 SD writes but doesn't append

ESP32 SD writes but doesn't append