Program Stuck at SD.begin(4)

Using Arduino Storage
1

Hello guys,

Just starting to use SD.h library to access my SD card. I tried many examples and all work just fine.
Finally i tried to use sd library to my program, but program stuck to void setup and nn particular to "SD.begin(4)" command.

As you can see to my program i use serial.println for debugging, and at my screen while program starts i see only "Initializing SD card..."

I use an arduino uno and an ethernet shield.

Any ideas? Thanks in advance!

#include <Time.h>
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <SD.h>

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 20); // IP address, may need to change depending on network
IPAddress dns1(192,168,1,1);
IPAddress gateway(192,168,1,1);
IPAddress subnet(255,255,255,0);
EthernetServer server(80);  // create a server at port 80

//NTP Info
IPAddress timeServer(132, 163, 4, 101); // time-a.timefreq.bldrdoc.gov
const int timeZone = 3;     // Central European Time
unsigned int localPort = 8888;  // local port to listen for UDP packets
EthernetUDP Udp;

String HTTP_req;          // stores the HTTP request
boolean LED_status = 0;   // state of LED, off by default
boolean RELAY_status = 0; // state of Relay, off by default
boolean RELAY2_status = 0; // state of Relay, off by default
float temp;
int tempPin = 0;


void setup()
{
    Ethernet.begin(mac, ip, dns1, gateway, subnet);  // initialize Ethernet device
    server.begin();           // start to listen for clients
    Serial.begin(9600);       // for diagnostics
    digitalWrite(10, HIGH);
    
    // initialize SD card
    Serial.println("Initializing SD card...");
    if (!SD.begin(4)) {
        Serial.println("ERROR - SD card initialization failed!");
        return;    // init failed
    }
    Serial.println("SUCCESS - SD card initialized.");
    if (!SD.exists("index.htm")) {
        Serial.println("ERROR - Can't find index.htm file!");
        return;  // can't find index file
    }
    Serial.println("SUCCESS - Found index.htm file.");

    pinMode(2, OUTPUT);       // LED on pin 2
    pinMode(3, OUTPUT);       // LED on pin 2
    pinMode(5, OUTPUT);       // LED on pin 2
    
    Udp.begin(localPort);
    setSyncProvider(getNtpTime);
}
........
......

myprogram.ino (11 KB)

2

Try disabling the SD card before starting the w5100. Add these two lines at the start of your setup function.

void setup() {
  pinMode(4, OUTPUT);
  digitalWrite(4, HIGH);
3

I have no problem using Ethernet and SD card at the same. They seem to take care of disabling the respective hardware after they function calls just fine.

Just to get a few simple questions answered:

  1. Is there anything connected to pin 4 other than the SD card?
  2. Is the CS pin of the SD card connected to pin 4?
  3. What SD shield or module are you using? Give a link.

FYI the arduino Ethernet shield/library assumes pin 10 is used to select the Ethernet chip, regardless what arduino board. This better not conflict with SD card's chip select.

4

So,

SurferTim, i tried it but nothing change

Liudr: I have the official ethernet shield (http://arduino.cc/en/Main/ArduinoEthernetShield). Also nothing connected to pin 4 and pin 10.

As i said before, simpler examples work just fine with no problem. ?nother observation is that at serial screen i dont get the full message "Initializing SD card...", but i only see "Initializing SD ca". Some characters are missing! (check attach file)

fail.jpg
fail.jpg1085×507 76.8 KB

5

It appears your Arduino is restarting for some reason. Hard to tell from here. Does the w5100 and SD card work ok separately?

6

Do you have anything in loop() ? loop() will execute even if the SD fails.

Try replacing these return statements in startup() with a forever loop. And add a Serial.flush. This won't solve the problem but may allow the entire message to print.

 if (!SD.begin(4)) {
        Serial.println("ERROR - SD card initialization failed!");
       for (;;);    // init failed  <-----------------------------------forever loop
    }
    Serial.println("SUCCESS - SD card initialized.");
    if (!SD.exists("index.htm")) {
        Serial.println("ERROR - Can't find index.htm file!");
        for (;;);  // can't find index file <---------------------------forever loop
    }
    Serial.println("SUCCESS - Found index.htm file.");
    Serial.flush();  // <-------------------------------------------flush serial print data
7

I actually sat down and read your attached program. You are using a huge amount of print with bits of webpages. That drains down your SRAM and causes crash when more memory is requested to start SD card. Try this: print(F("here is a bit of webpage")). The FLASH helper F() saves your SRAM. The ultimate solution is to print out a static webpage off your sd card and leaving dynamic contents to javascript.

(Curse forum, I had to type this response twice as my first response was lost in their silly problems.)