ESP8266 Community Forum

- Sun Jul 10, 2016 10:52 am #50503 Hi,

I am getting WDT resets every time I try to use a remove() or exists() on arduino with the ESP8266. Reading and writing is working fine. Does anybody know why that might be?

It's an 8GB card, formatted for FAT32. I have verified that files are created correctly by viewing them on a PC. But a call to SD.remove() or SD.exists() results in output similar to the following:


ets Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v60000318
~ld

...and the device resetting.

Any help would be appreciated! Great forums. I have searched but can't find anything related... apologies if I have missed something obvious.

- Sun Jul 10, 2016 4:44 pm #50528 Make a 3GB partition on that card and format it with FAT again. The lib can not work with larger partitions.

Async HTTP and WebSocket Server for ESP8266
Async TCP Library for ESP8266
ESP8266 Exception Stack Trace Decoder

- Sun Jul 10, 2016 6:34 pm #50534 Thanks I tried creating only a single 3GB partition on an 8GB card, and formatting as FAT16, but a:

SD.remote('myfile.txt');

Still produces an exception:

ets Jan 8 2013,rst cause:4, boot mode:(3,7)

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v60000318
~ld

Does the physical size of the card make a difference? Like, can the ESP8266 not support SDHC perhaps?

cheers
David

- Mon Jul 11, 2016 1:51 am #50553 I run 8GB SDHC card also. I have one 3GB partition in FAT32 I think and have had no problems.
Can you check what the ESP sees from the card?

Code: Select allconst char *getSdTypeString(){
  if (SD.type() == SD_CARD_TYPE_SD1){
    return "SD1";
  } else if(SD.type() == SD_CARD_TYPE_SD2){
    return "SD2";
  } else if(SD.type() == SD_CARD_TYPE_SDHC){
    return "SDHC";
  } else {
    return "UNKNOWN";
  }
}

String getSizeString(size_t bytes){
  if (bytes < 1024){
    return String(String(bytes)+"B");
  } else if(bytes < (1024 * 1024)){
    return String(String(bytes/1024.0)+"KB");
  } else if(bytes < (1024 * 1024 * 1024)){
    return String(String(bytes/1024.0/1024.0)+"MB");
  } else {
    return String(String(bytes/1024.0/1024.0/1024.0)+"GB");
  }
}


bool initSD(){
  if (SD.begin(SS, 32000000)){
    Serial.print("\n==== SD Card Info ====\n");
    Serial.printf("SD Type: %s FAT%d, Size: %s\n", getSdTypeString(), SD.fatType(), getSizeString(SD.size()).c_str());
    Serial.printf("SD Blocks: total: %d, size: %s\n", SD.totalBlocks(), getSizeString(SD.blockSize()).c_str());
    Serial.printf("SD Clusters: total: %d, blocks: %d, size: %s\n", SD.totalClusters(), SD.blocksPerCluster(), getSizeString(SD.clusterSize()).c_str());
    sd::File entry;
    sd::File dir = SD.open("/");
    dir.rewindDirectory();
    while(true){
      entry = dir.openNextFile();
      if (!entry) break;
      Serial.printf("SD File: %s, type: %s, size: %s\n", entry.name(), (entry.isDirectory())?"dir":"file", getSizeString(entry.size()).c_str());
      entry.close();
    }
    dir.close();
    Serial.println();
    return true;
  } else
    Serial.println("SD Card Not Found!");
  return false;
}


Async HTTP and WebSocket Server for ESP8266
Async TCP Library for ESP8266
ESP8266 Exception Stack Trace Decoder