Talking to DC-16 output expansion board

Nicholas Bott

I can't seem to get Javelin to talk to the DC-16 Output Expansion Board (#31216). I wrote a Uart Library; but, it doesn't seem to be responding to my messages.

I attached my java code. Any help would be appreciated as I've stumbled over this issue with RC-4 and other serial controlled things. I can only find P-BASIC examples, so I'm sorta stuck.

Thanks much!

Peter Verkaik

You don't need to write your own Uart!
The javelin has a class for Uart (see manual).
For bidirectional you need 2 uart objects.

import stamp.core.*;public class Testing{ static Uart serialTx = new Uart(CPU.dirTransmit,CPU.pin15,Uart.dontInvert,Uart.speed2400,Uart.stop1);
static Uart serialRx = new Uart(CPU.dirReceive,CPU.pin14,Uart.dontInvert,Uart.speed2400,Uart.stop1);
static Timer t = new Timer(); public static void main() {
int n=0,c;
serialTx.sendString("!DC16"); char block = 3; serialTx.sendByte(block); serialTx.sendByte('V'); System.out.println("Sending..."); //System.out.println(serial.SerOut(1000)); System.out.println("Receiving..."); while (true) { //Expect 3 bytes and wait up to 1000ms for them (sweet!)
System.out.print("BINGO! ");
t.mark(); //reset timer while (!t.timeout(1000) && (n<3)) {

if (serialRx.byteAvailable()) {
c = serialRx.receiveByte(); System.out.print((char)c);
n++; }
}
System.out.print('\n'); } }}
That should give you an idea how to use the Uart object.
regards peter

Post Edited (Peter Verkaik) : 10/13/2006 6:49:04 AM GMT

Nicholas Bott

I haven't had any luck with your example. I tried dontInvert and invert, I also tried swapping pins. Is Red generally Input or Output?

I have only been able to get 0 (byte) reply from the DC16 unit. (which is just based upon the invert / dontInvert / Pin)

There are a few things I need to verify. The BASIC example they give is:
SEROUT Pin, Baud, ("!DC16", %11, "V")
SERIN Pin, Baud, v1, v2, v3

Do you see anything wrong with my attempt in the attached file?

Peter Verkaik

I checked the DC16 manual. It appears the DC16 board uses a single pin
to transmit and receive.
I adapted my psc class for the DC16 board.
This class must be stored in folder
%IDE path%\lib\stamp\peripheral\relay\dc16\

Read this class how to connect the javelin to the DC16 board, using either 1 or 2 javelin
I/O pins.

regards peter

Nicholas Bott

Thanks for writing a wrapper, Peter. Unfortunately it seems to return a random number for the Firmware Version every time - and although I don't really care about the version, I just want to get it to do *something*, it doesn't seem to be responding to my invokes. (I checked the output with a meter)

Not sure if you have any more advice about this, since I know you don't have the component to test with.

Peter Verkaik

I don't have the component.
Check the wiring. You need to have a 0V connection (GND dc16 to GND javelin)
and a TX/RX connection (Javelin I/O pin to dc16 pin).·I·think the dc16 pin to use
is the one marked W (there is a 3pin connector labeled RWB on the dc16 board)
I know the communication worked on the psc board.

regards peter

Peter Verkaik

Do you use the one pin or the two pin connection
as described in the DC16 class?

regards peter

Nicholas Bott

I got it working! Thanks for your help!

Peter Verkaik

Great.
How do you connect the dc16 board to the javelin to make it work?

regards peter
·

Nicholas Bott

I am using the one pin setup. The white wire turned out to be the one I needed to talk to. The ground is plugged into VSS and the White wire is plugged into Pin14.

Peter Verkaik

Thanks.
I updated the DC16 class with that info.

regards peter

Peter Verkaik

I optimized the DC16 class so it takes less code space.

regards peter

Nicholas Bott

Thanks!