interface USB memory datalogger parallax 27937

Forum 2005-2010 (read only) Hardware Interfacing
1

I tried to interface USB memory datalogger using parallax 27937
(http://www.parallax.com/Store/Microcontrollers/BASICStampModules/tabid/134/List/1/ProductID/434/Default.aspx?txtSearch=27937+&SortField=ProductName%2CProductName) with arduino diecimila. :cry:

I have spent more than a week to get it works BUT IT IS NOT. The chip supports 2 modes: SPI & UART, and I tried both.

My problems is how to connect CTS, RTS & RI in UART mode.

The other thing is the UART mode is easier to interface than the SPI mode?

:'(I need your your help, pleeeeeease :cry:

2

I tried with this code :'((JUST TO CREATE A FILE) :cry:

int ledPin = 13; // LED connected to digital pin 13
int i=0;
void setup() // run once, when the sketch starts
{
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH);
delay(10000);
digitalWrite(ledPin, LOW);
Serial.begin(9600);
}

void loop() // run over and over again
{
if(i==0)
{
Serial.println("ipa");
delay(100);
Serial.println("OPW test.txt");
delay(100);
Serial.println("CLF test.txt");
delay(100);
}
i=1;
}

3

This is a knock-off of the VDIP1 and VDIP2, using the same chip. Check the playground, tutorials, and the forum for information on this device.

There is no dedicated CTS/RTS/RI pins on the arduino - just pick the digital IOs you want and use them. You'll have to handle the handshaking yourself as well.

I think the UART is the easier interface, mostly because the SPI interface on the VNC1L chip doesn't use even 8 bit boundaries for the transfers, but the ATmega's USART expects to transfer bytes. As best I can tell, this means you'll have you bit-bang if you want to use SPI.

-j

4

I tried all tutorials but still no progress.
could any one please help me to find an applicable arduino example for this chip. :cry:

thank you