Pages: 1 ... 6 7 [8] 9   Go Down
Author Topic: Loop Back Test - Sticky?  (Read 27109 times)
0 Members and 1 Guest are viewing this topic.
Seattle, WA USA
Offline Offline
Brattain Member
*****
Karma: 548
Posts: 46042
Seattle, WA USA
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
Pretty much the causes are fried or misprogrammed USB interface chip.
Could be something you did to the PC, too. I mean, after all, you've got the shift key sticking pretty badly.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 62
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

When I do a loopback test, the TX and RX lights both flash at the same time when I type, but I get nothing on the screen in the Serial Monitor. Also tried with PuTTY, with same results. This behavior is the same on 2 different machines. The board works on one and not the other, so that is why I am trying the loopback test. Seems odd it does not work on EITHER machine! The drivers seem to work, and the board is recognized just fine on both machines.

And if I upload a sketch to do a Serial.println("Hello!");, that works just fine, and I see the test come up in the Serial Monitor.
« Last Edit: March 11, 2013, 10:49:26 am by jrburke99 » Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset


Is your post above about the same problem you reported here...
http://arduino.cc/forum/index.php/topic,153580.msg1151727.html#msg1151727
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 62
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes and no. Same board, but this happens even on my machine that works perfectly fine. So wondering why the loopback does not work even when everything else seems to work fine. I can see both the TX and RX lights flash when I type, I can upload sketches and they work fine, and if my sketch prints back to the serial monitor, I see that all just fine as well.
Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
And if I upload a sketch to do a Serial.println("Hello!");, that works just fine, and I see the test come up in the Serial Monitor.

And in PuTTY?

Assuming everything is working the way you described, the only thing left is the Windows kernel driver.

Is the Prolific PL-2303HX USB driver provided by Microsoft or Prolific?  (You will have to check the version stamp on the .SYS file.)
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 62
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

The driver was downloaded directly from the Prolific website. In PuTTY, I get the same thing where I see nothing when I type, although I see the TX and RX lights on the board blink when I type.

Also, I have gotten this to work on the Win7 box, but only by using VirtualBox with a WinXP OS, and creating a COM port in the virtual machine that maps back to the one in Win7 that is created by Prolific. If I simply pass the USB device through, it shows up fine in the WinXP control Panel, but I get the same other problems.
Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

The driver was downloaded directly from the Prolific website.

That doesn't mean anything.  The Arduino Uno driver is a good example.  It can be downloaded directly from this site but the kernel driver is Microsoft's.

Quote
In PuTTY, I get the same thing where I see nothing when I type, although I see the TX and RX lights on the board blink when I type.

As far as I can tell, that proves the kernel driver is the culprit.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 62
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Great. So if the kernel driver is the most likely culprit, how can I remedy that?
Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset


1. Use Google to determine if others have similar problems (my diagnosis could be wrong; you may find a solution).

2. Search the vendor's site for a newer version.

3. Pester the vendor for a bugfix.

4. Test older versions.

5. Determine if the converter is similar or identical to other converters and use the driver from the other converter (this one entails modifying or creating an INF file).

6. Stop wasting your time and buy a board from a reputable vendor.
Logged

Offline Offline
Newbie
*
Karma: 0
Posts: 10
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Are the instructions basically the same for a mac?
Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset


Yes.
Logged

0
Offline Offline
Full Member
***
Karma: 1
Posts: 225
#include˂baby.h˃™
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Will this test verify the operation of an FTDI board/cable without an arduino, just by jumpering the RX to TX lines?
Logged

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset


Yes.
Logged

Topsham, Vermont USA
Online Online
Edison Member
*
Karma: 23
Posts: 1759
... in The Woods In Vermont
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,
Would it be good to include a photo of an Arduino with the two jumpers clearly in position?

I'd need to find some Red or Yellow wire....
Logged

Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

Global Moderator
Dallas
Offline Offline
Shannon Member
*****
Karma: 176
Posts: 12283
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset


Sounds good to me.  If you make an image, please try to keep it less than or equal to 320 by 240.
Logged

Pages: 1 ... 6 7 [8] 9   Go Up
Jump to: