The J-Link EDU is not able to read the correct Target Voltage from two separate ATSAMD21G18A's I've tested with it. Both return a reading of 0.0V.
One ATSAMD21 is in an Arduino MKRZero and the other is in an Arduino MKR1000.
This is the setup:
- The J-Link is plugged into the computer with it's driver package installed and Atmel Studio open, like in this tutorial: https://learn.adafruit.com/proper-step- ... 0?view=all
- The MKR1000 has wires connecting from it's 10-pin connector to the proper pins on the J-Link's 20-pin connector. Most importantly, the wire carrying the target voltage is properly seated in pin 1 of the 20-pin connector. I've tested the connection as best as I can with the continuity setting of my multimeter.
- The MKR1000 is powered on and the voltage across it's GND and VCC, both connected to the J-Link, is 3.3V. I tested this with the same multimeter.
- SWDIO and SWCLK are also connected to the proper pins. RESET is as well, but as the tutorial linked above states, it is not necessary.
- In Atmel Studio I go to Tools>Device Programmer. From here I select "J-Link" as the Tool, "ATSAMD21G18A" as the Device, "SWD" as the Interface, and click apply. This step goes well.
- When I click "Read" near the "Target Voltage" box, the J-Link and Atmel Studio report back "0.0V", which is wrong.
What am I missing? Do I have a faulty J-Link EDU?
Thank you for the help ahead of time.
J-Link EDU Target Voltage Detection
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- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: J-Link EDU Target Voltage Detection
please post a photo of your setup - jlinks are pretty well made and very rugged - its unlikely its the jlink!
- animationb
- Posts: 6
- Joined: Fri Apr 22, 2016 10:17 pm
Re: J-Link EDU Target Voltage Detection
It's fixed.
It's going to sound crazy, but it works now, and the only thing that's changed is the date on the calendar.
In all likelihood, it's possible I plugged something in the wrong pin on the J-Link, but i checked those 4 times.
Either way, thank you very much for the support!
The setup I list above works.
It's going to sound crazy, but it works now, and the only thing that's changed is the date on the calendar.
In all likelihood, it's possible I plugged something in the wrong pin on the J-Link, but i checked those 4 times.
Either way, thank you very much for the support!
The setup I list above works.
- ifenta
- Posts: 62
- Joined: Fri Apr 15, 2016 1:48 pm
Re: J-Link EDU Target Voltage Detection
I am also having trouble on connecting my ATSAMD21G18A to the J-Link Base; I've used it well in the past, however today it's not working.
I created a custom PCB and wanted to program it but the J-Link was detecting 0.0V. So I tested with my featherboard M0 to see if my circuit was the problem, however the featherboard didnt work either. Below are images of how I soldered the connections and ran Atmel Studio. Again, it has worked fine in the past year I've used it, however today its not working.
Thanks!
I created a custom PCB and wanted to program it but the J-Link was detecting 0.0V. So I tested with my featherboard M0 to see if my circuit was the problem, however the featherboard didnt work either. Below are images of how I soldered the connections and ran Atmel Studio. Again, it has worked fine in the past year I've used it, however today its not working.
Thanks!
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- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: J-Link EDU Target Voltage Detection
you may have the wrong pins, thats really common? check the voltages with a multimeter of course
for any other tech support on the jlinks, please contact segger: https://www.segger.com/
for any other tech support on the jlinks, please contact segger: https://www.segger.com/
- etoilexxx
- Posts: 4
- Joined: Sun Jan 14, 2018 2:22 pm
Re: J-Link EDU Target Voltage Detection
I just bought edu mini and I am very happy with the results so far. I have one question, pin1 supposed to be the Vcc, when I measure the voltage on it, I don't get a constant 3.3V, it gives a random reading under 1.3V. Is my unit defective?
Thanks,
Fahd
Thanks,
Fahd
- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: J-Link EDU Target Voltage Detection
you must PROVIDE vcc to it
- etoilexxx
- Posts: 4
- Joined: Sun Jan 14, 2018 2:22 pm
Re: J-Link EDU Target Voltage Detection
I thought it was and output. So I have to provide voltage to the module being programmed separately, right?
Thanks for the quick reply in such a cold and sunny day
Thanks for the quick reply in such a cold and sunny day
- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: J-Link EDU Target Voltage Detection
no - it is not an output, you must provide the logic voltage to that pin
- etoilexxx
- Posts: 4
- Joined: Sun Jan 14, 2018 2:22 pm
Re: J-Link EDU Target Voltage Detection
Got it thanks
Please be positive and constructive with your questions and comments.