jtag Olimex Tiny LED

Development Boards MicroMod
1

Hello together,

what is the meaning of the red LED on the Olimex JTAG-Adapter?

Permanent light?

Thanks in advance,

nik

2

yeah i wonder it too ? what is it ? :slight_smile: is it a sign of working ?

3

is there anyone know this ?

4

Also for Olimex ARM-USB-OCD (not Tiny): What is yellow LED for?

I also ask myself if there exists some user-doku for this devices - that explains the usage-workflow,

e.g. the meaning of the LED’s, how one can reset the devices after error etc… (OLIMEX shipped a document for my device - but it mainly explains how to jumper power supply output voltage for the board and describes the pin-layout)

Maybe we can here gather some more info for this devices:

  • OLIMEX ARM-USB-OCD JTAG (for USB)

  • OLIMEX ARM-OCD-Tiny JTAG (for parallel port)

5

looking at the source, openocd just toggles this led when executing a jtag command queue.

So it only really means something when the core is running and openocd is executing jtag instructions.

Cheers

Spen

6

Openocd toggles the red led when it reads data in the debugmode, too.

Permanent red light?

Sometimes, when i flashed a prg the LED lights and sometimes not.

Cheers

nik

7

Not being pedantic, but that is the same thing.

It needs to execute a jtag command to do anything.

Cheers

Spen