The J-Link line of JTAG programmers from Segger is well known for their top of the line debuggers. The J-Link EDU Mini is a great option for those getting started with JTAG/SWD programming and debugging. Each J-Link EDU Mini is a version of the J-Link EDU Base in a reduced form factor with identical functionality for Cortex-M based targets. I have bought a JLink EDU mini and have tried to make it work with the ESP32 Wroom module for the last few days to no avail. When trying to connect to the chip via openocd, I get the following error: Open On-Chip Debugger v0.10.0-esp3 (2019-04-14-16:36).
This topic contains 1 reply, has 2 voices, and was last updated by 1 year, 9 months ago.
Hi,
It does look like some sort of a low-level communication issue between OpenOCD and the JTAG probe. If others have reproduced the same problem outside VisualGDB, it may indicate that the Espressif’s OpenOCD port is simply not compatible with this version of J-Link.
Our best advice would be to try one of the debug probes that is fully supported (e.g. Olimex ARM-USB-OCD-H or any other one based on the FT2232 chip). Also if Espressif fixes the issue in the future in their github repository, please feel to let us know and we will be happy to release an updated binary package with the fix.
Low-cost J-Link for educational purpose J-LINK EDU is identical to J-Link BASE and offers the same functionality. It has been designed to allow students and educational facilities as well as hobbyists access to top of the line debug probe technology.
- Supports a broad range of microcontrollers
- Multiple CPUs supported—8051, PIC32, RX, ARM7/9/11, Cortex-M/R/A, RISC-V
- Download speed up to 1 MByte/s
- Supports unlimited breakpoints in flash memory, additional license required.
- Built-in VCOM functionality
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- 1.Full J-Link Support
- 2.Limitations
- 3.Specifications
- 4.Terms of use
- 5.How to purchase J-Link EDU
- 6.Package Content
Full J-Link Support
Unlimited Breakpoints
The J-Link EDU license includes the unlimited breakpoints in flash memory feature. With the Flash Breakpoints, developers may set an unlimited number of breakpoints in flash memory helping to debug applications that run from flash memory.
Free Software Updates
As a legitimate owner of a SEGGER J-Link, you can always download the latest software free of charge. Though not planned and not likely, we reserve the right to change this policy. Note that older models may not be supported by newer versions of the software. Typically, we support older models with new software at least 3 years after end of life.
Supports concurrent access to CPU by multiple applications
J-Link allows multiple applications to access a CPU at the same time. This has numerous applications. J-Link commander can be used in parallel to a debugger, a tool to communicate via DCC can be used in parallel to a debugger or a visualization tool such as Micrium's u/C-Probe or SEGGER's kernel viewer embOSView. This feature is currently not available for Cortex A and R cores.
Crossplatform support
runs on Windows, Linux, macOS. The MAC and Linux versions are fully usable, but limited to the following components:
J-Link Commander, command line GDBServer, shared library (DLL-equivalent)
Licensing and Support
- J-Link EDU may only be used for non-commercial purposes.
- J-Link EDU does not come with support. In case of questions / problems, you can visit our community forum. However, there is no claim for guaranteed support in the forum. View forum rules for more information.
Specifications
| Specification | Value |
|---|---|
| Supported OS | Microsoft Windows 2000, XP, 2003, Vista, 7 and newer Linux macOS 10.5 and higher |
| Electromagnetic compatibility (EMC) | EN 55022, EN 55024 |
| Operating temperature | +5°C ... +60°C |
| Storage temperature | -20°C ... +65 °C |
| Relative humidity (non-condensing) | Max. 90% rH |
| Mechanical | |
| Size (without cables) | 100mm x 53mm x 27mm |
| Weight (without cables) | 70g |
| Available Interfaces | |
| USB interface | USB 2.0 (Hi-Speed) |
| Target interface | JTAG/SWD 20-pin |
| JTAG/SWD Interface, Electrical | |
| Power supply | USB powered Max. 50mA + Target Supply current. |
| Target interface voltage (VIF) | 1.2V ... 5V |
| Current drawn from target voltage sense pin (VTRef) | < 25µA |
| Target supply voltage | 4.5V ... 5V (if powered with 5V on USB) |
| Target supply current | Max. 300mA |
| Reset type | Open drain. Can be pulled low or tristated |
| Reset low level output voltage | VOL <= 10% of VIF |
| For the whole target voltage range (1.2V <= VIF <= 5V) | |
| LOW level input voltage (VIL) | VIL <= 40% of VIF |
| HIGH level input voltage (VIH) | VIH >= 60% of VIF |
| For 1.2V >= VIF <= 3.6V | |
| LOW level output voltage (VOL) with a load of 10 kOhm | VOL <= 10% of VIF |
| HIGH level output voltage (VOH) with a load of 10 kOhm | VOH >= 90% of VIF |
| For 3.6 <= VIF <= 5V | |
| LOW level output voltage (VOL) with a load of 10 kOhm | VOL <= 20% of VIF |
| HIGH level output voltage (VOH) with a load of 10 kOhm | VOH >= 80% of VIF |
| JTAG/SWD Interface, Timing | |
| JTAG speed | Max. 15 MHz |
| SWO sampling frequency | Max. 30 MHz |
| Data input rise time (Trdi) | Trdi <= 20ns |
| Data input fall time (Tfdi) | Tfdi <= 20ns |
| Data output rise time (Trdo) | Trdo <= 10ns |
| Data output fall time (Tfdo) | Tfdo <= 10ns |
| Clock rise time (Trc) | Trc <= 3ns |
| Clock fall time (Tfc) | Trc <= 3ns |
You may use the J-Link EDU for non profit educational purposes only! Non-profit educational purposes means that you may not use the J-Link EDU and its J-Link software:
- directly or indirectly in or for a profit organization or business purposes or other undertaking intended for profit.
- direct or indirect within any other commercial environment (e.g. office).
- to develop, debug, program or manufacture a commercial product (or parts thereof).
- to use it to either earn money or reasonably anticipate the receipt of monetary gain from it.
Any other use of the J-Link EDU is prohibited and illegal! If there is any doubt if a certain use may be considered within the foregoing scope or whether your use of the J-Link EDU applies to an educational situation, it is strongly recommended to get in touch and consult SEGGER prior use.
For clarification purposes: A student using the J-Link EDU direct or indirect in a business or profit organization (e.g. company) is considered a violation of the scope of this agreement.
Note: Before connecting with the J-Link EDU you need to accept the Terms of use as shown on the screen below:
How to purchase J-Link EDU
J-Link EDU is available for 49.98 € including VAT (list price)
In case you would like to purchase the J-Link EDU from Europe, please contact the appropriate distributor in your country or the online shop at AK-Modul-Bus. For purchase from countries outside Europe, J-Link EDU is sold via distribution or at the Digi-Key website. U.S. customers, please check out our website shop-us.segger.com.
If you are not sure how to purchase a SEGGER J-Link EDU, please contact sales@segger.com.
J-Link EDU
.1' 20-pin ribbon cable
USB cable
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