I recently bought an Arduino ethernet shield for my Arduino ATMEGA128 but the memory was too small to include the sdcard library and the ethernet library so I splashed out and bought a Leonardo.
With the Leonardo I can use the ethernet library and connect to the ethernet shield ok but I cannot read, write or even access, the SD card. If I upload the cardinfo script from the examples after a successful upload nothing happens, the serial monitor is empy. I have tried changing the CS pin to from 4 to 10 without success but the information I have read suggests that pin 4 is correct for the ethernet shield. I have also tried setting pin 10 high but that didn't work either.
I am getting very frustrated and so any help would be greatly appreciated.
Show us your sketch between code tags.
Did you try another SD card ? Perhaps the SD card is not compatible or is formatted in the wrong way.
The sketch is the cardinfo one in the Arduino IDE and on this website. Here it is:
/*
SD card test
This example shows how use the utility libraries on which the'
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#include <SD.h>
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
const int chipSelect = 4;
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("\nInitializing SD card...");
// On the Ethernet Shield, CS is pin 4. It's set as an output by default.
// Note that even if it's not used as the CS pin, the hardware SS pin
// (10 on most Arduino boards, 53 on the Mega) must be left as an output
// or the SD library functions will not work.
pinMode(10, OUTPUT); // change this to 53 on a mega
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card is inserted?");
Serial.println("* Is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
return;
} else {
Serial.println("Wiring is correct and a card is present.");
}
// print the type of card
Serial.print("\nCard type: ");
switch(card.type()) {
case SD_CARD_TYPE_SD1:
Serial.println("SD1");
break;
case SD_CARD_TYPE_SD2:
Serial.println("SD2");
break;
case SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
break;
default:
Serial.println("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize *= 512; // SD card blocks are always 512 bytes
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
}
void loop(void) {
}
I have tried two sd cards, both 8GB and both are readable on my Ubuntu laptop.I have also tried with the SD card removed and the "initialization failed. Things to check:" warning doesn't appear which is very strange. I think the problem has something to do with the serial communication.
There are a few things you could try.
Make the SPI bus idle like this : DHT22 Webserver - #34 by Peter_n - Sensors - Arduino Forum
Format the SD card (in Windows) : Don't Format SD cards with OS utilities! - Storage - Arduino Forum
Do you have an older 1GB or 2GB sd card to test ?
Do you have a Ethernet Shield version "R3" ? You could make a photo of both sided to show it to us. There should be a 6-pin (2x3) header at the bottom.
Do you use the newest Arduino 1.6.4 ?
Perhaps your board is faulty. Is it a cheap board from Ebay ?
I have added your code to make the SPI bus idle and the sketch works now ;D
I will run some more tests tomorrow but it's looking good.
Thank you very much.
I have also problem using Arduino Leonardo with SeeedStudio SD shield V4 (http://wiki.seeed.cc/SD_Card_shield_V4.0/) the card can not be initialized, although i used both SD and SDFat libraries..any ideas ?
