UART and Hyperterminal

Don French

I have been trying to get the UART example HyperTermCOM.java to work with the MS Hyperterm program with no success.· So, what could I be doing wrong?· Here is the code of HyperTermCOM:


import stamp.core.*;
public cl(expletive) HyperTermCOM {························ // COM Port (9-pin serial)
· final static int SERIAL_TX_PIN = CPU.pin0;······· //···· 2
· final static int SERIAL_RTS_PIN = CPU.pin1;······ //···· 7
· final static int SERIAL_CTS_PIN = CPU.pin2;······ //···· 8
· final static int SERIAL_RX_PIN = CPU.pin3;······· //···· 3

· static Uart txUart = new Uart( Uart.dirTransmit, SERIAL_TX_PIN, Uart.dontInvert,
························· SERIAL_RTS_PIN, Uart.dontInvert, Uart.speed9600,
························· Uart.stop1 );
· static Uart rxUart = new Uart( Uart.dirReceive, SERIAL_RX_PIN, Uart.dontInvert,
························· SERIAL_CTS_PIN, Uart.dontInvert, Uart.speed9600,
························· Uart.stop1 );

· static StringBuffer buffer = new StringBuffer(128);
· static char c;
· static void bufferMessage(){
··· c = 0xff;
··· while (c != '\r'){
····· if(rxUart.byteAvailable()){
······· c = (char)rxUart.receiveByte();
······· buffer.append(c);
····· }
··· }
· }················································· // end bufferMessage
· public static void main(){
··· do{
····· buffer.clear();
····· txUart.sendString("Type a message, the press enter: \n\r");
····· bufferMessage();
····· txUart.sendString("The message you sent was: \n\r");
····· txUart.sendString(buffer.toString());
····· txUart.sendString("\n\rDo you want to enter another message? (y/n) \n\r");
····· c = (char) rxUart.receiveByte();
··· } while(c == 'y' || c != 'n');
··· txUart.sendString("Goodbye!\n\r");
· }················································· // end main
}··················································· // end cl(expletive) declaration

I could not find where in the documentation·the IO pins that are attached to the onboard COM port on the Demo board are defined, but I am (expletive)uming that the ones in the example are right.· Correct?

In Hyperterminal, I have the following settings:· COM1 9600 baud 8-N-1 Hardware

But I don't get anything in the Hyperterm window and it does not show what I type.· What am I doing wrong?

·

QuattroRS4

Are you using a 'Full' serial cable - may be that you are using a Null Modem cable ?

I have used routines for null modem (3wire - rx,tx,gnd) - on·my own circuits with·no issues

static Uart txUart = new Uart(Uart.dirTransmit,
CPU.pin0, Uart.invert,Uart.speed9600,Uart.stop1 );


with this example - hyperterminal is set to 9600,n,8,1 - none

Post Edited (QuattroRS4) : 1/26/2007 6:30:49 AM GMT

Don French

Ok, I found where to echo what I type but I get nothing back. Plus, it takes a long time to (several seconds) echo characters. And I never get anything from the Javelin.

P.S. I can't believe that this forum converts every occurance of a-s-s to (expletive), even when it is included in the middle of a word. I (expletive)ume that is to protect our youth, who will be corrupted by reading the word a-s-s? Save me!

QuattroRS4

I suppose the expletive delete is to protect the young hobbyist·!

What serial cable are you using, Is it a homebrew board or kit ?

did you try a simple send from the javelin to hyperterminal ?

Peter Verkaik

The expletive thing is since yesterday, I think because of this thread
http://forums.parallax.com/showthread.php?p=626089
because it never happened before.

To make the javelin work with a pc com port you need to wire
javelin I/O pins to a rs232 level shifter, like the SP237 onboard
the javelin demoboard or a max232 (or alike).

regards peter

Don French

No, as I said, this is the Javelin Demo board I am talking about. And I am using a standard PC serial cable, the same one I use to program the Javelin on the Javelin Demo board. I thought that the COM port on the demo board was already wired and ready to go. Am I mistaken? Isn't the hyperterm example supposed to work with the COM port. And I am not trying to use the same port that I program the Javelin with, rather the other one that is at right angles to it. I ask again, are the Javelin pins that are (expletive)igned in the example the correct pins for this COM port? Where in the documentation would that be stated?

Don French

Quattro, what do you mean by "Did I try a simple send from the Javelin to hyperterminal?" Isn't the send from the HyperTermCom.java program a simple send?

P.S. Would the moderator please turn off that stupid expletive thing? No kids are harmed by reading the word a-s-s. And when it is embedded inside another word,even!!! My Lord!!!

Peter Verkaik

The serial port labeled COM is not standard wired to any javelin I/O pin.
(The program port is labeled JIDE)
see manual page 64 and further. (Communicating with other computers).

You need to supply connections between connectors X2 and X4 (figure 4.8b)

regards peter

Don French

I was blind, I guess.· Thanks!