ARDUINO Writing data to Usb Memory Stick

URL ORIGEN
http://www.arduino.cc/playground/Main/UsbMemory

int incomingByte=0;\\

int fileNumber=1;\\

int noOfChars;\\

long int valToWrite;\\

char activityToLog;\\

long int x;\\

long int startLogTime = 0;\\

void setup() {

Serial.begin(9600); // opens serial port, sets data rate to 9600 bps

Serial.print("IPA"); // sets the vdip to use ascii numbers

//(so I can read them in the code easily!)

Serial.print(13, BYTE); // return character to tell vdip its end of message

}

void loop() {

if (Serial.available() > 0) { // read the incoming byte

incomingByte = Serial.read();

if (incomingByte=='1'){ // if it receives a 1

Serial.print("OPW LOG%"); // open to write creates a file - named

Serial.print(fileNumber); // LOG%1.TXT first time round - .TXT is for the computer

Serial.print(".TXT"); // I have used the % sign in the name so I can

//search the disk for log files that it has created

//so as not to overwrite any that may be on already

Serial.print(13, BYTE); // return character

}

if (incomingByte=='2'){ // if it receives a 2

Serial.print("CLF LOG%"); // it closes the file

Serial.print(fileNumber); // LOG%1.TXT

Serial.print(".TXT");

Serial.print(13, BYTE); // return character

}

if (incomingByte=='3'){ // if it receives 3

Serial.print("DIR"); // lists the directory on the memory stick

Serial.print(13, BYTE); // which will now include the file LOG%1.TXT

}

if (incomingByte=='5'){

activityToLog='P'; // I will be using different letters to label my time stamps

valToWrite=millis() - startLogTime; // time since we started logging

noOfChars=1;

x=valToWrite; // need to copy valToWrite as getting no of characters will consume it

while (x>= 10){ // counts the characters in the number

noOfChars++; // thanks to D Mellis for this bit

x/=10;

}

noOfChars +=2; //add 2 to the num as will also write the letter P and a return character

Serial.print("WRF "); //write to file (file needs to have been opened to write first)

Serial.print(noOfChars); //needs to then be told how many characters will be written

Serial.print(13, BYTE); //return to say command is finished

Serial.print(activityToLog); //followed by the info to write

Serial.print(valToWrite);

Serial.print(13, BYTE); //write a return to the contents of the file (so each entry appears on a new line)

}

if (incomingByte=='6'){

fileNumber++; //so we can create other files

}

if (incomingByte=='7'){

if (fileNumber>0){ //and look at previous ones

fileNumber--;

}

}

if (incomingByte=='8'){

Serial.print("RD LOG%"); //reads the contents of named file

Serial.print(fileNumber);

Serial.print(".TXT");

Serial.print(13, BYTE);

}}

if (incomingByte=='9'){

startLogTime=millis(); // reset timing

}

}