Vinculum USB read file question **FIXED-ISH**

Forum 2005-2010 (read only) Hardware Interfacing
1

Hi all

I am writing an app to read the contents of a file stored on a USB key following the tutorial at:

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

However I am having a problem reading the data back using the RD command and can't seem to find any further references in the forum. Theoretically using the code below I should be capturing the first 4 bytes of the file contents and printing them out to the serial monitor but I am getting no feedback. Any help would be gratefully appreciated!

Cal

#include <SoftwareSerial.h>

/***********************************************

  • The LightSpace is wired up thus:
  • The USB outputs to Arduino PD3 (Pin Digital 3)
  • The USB takes input from Arduino PD7
    ************************************************/

#define recievePin 3
#define transmitPin 7

// set up a new serial port
SoftwareSerial mySoftwareSerial = SoftwareSerial(recievePin, transmitPin);

int incomingChar;

void setup()
{
Serial.begin(57600);
Serial.println("working!");
pinMode(recievePin, INPUT);
pinMode(transmitPin, OUTPUT);
digitalWrite(transmitPin, HIGH);
delay(3000);
// set the data rate for the SoftwareSerial port
mySoftwareSerial.begin(9600);
mySoftwareSerial.print("IPA");
mySoftwareSerial.print(13, BYTE);
delay(5);
}
/***********************************************
************************************************/
void loop()
{
int n = 0;

if(n == 0)
{
n = 1;

mySoftwareSerial.print("OPR TIMTEST.TXT");
mySoftwareSerial.print(13, BYTE);

delay(1000);

mySoftwareSerial.print("RD TIMTEST.TXT");
mySoftwareSerial.print(13, BYTE);

incomingChar = mySoftwareSerial.read();
Serial.print(incomingChar, BYTE);
incomingChar = mySoftwareSerial.read();
Serial.print(incomingChar, BYTE);
incomingChar = mySoftwareSerial.read();
Serial.print(incomingChar, BYTE);
incomingChar = mySoftwareSerial.read();
Serial.print(incomingChar, BYTE);

delay(1000);

mySoftwareSerial.print("CLF TIMTEST.TXT");
mySoftwareSerial.print(13, BYTE);

delay(1000);

Serial.print("DIR");
mySoftwareSerial.print(13, BYTE);

}
}

2

Fixed it! or at least discovered a workaround. Using the dos command 'RD' doesn't seem to return the values, but I discovered that by using the 'RDF' command followed by the byte requirements, then cycling through the required number of software serial read and serial print combos it will cleanly report the bytes.

So that part is fixed, now all I have to do is read in the byte size of the file and then cycle through.