You can buy a Segger JTAG J-Link clone for few USD on, aliexpress, dx. If you try to update its firmware with the official Segger tool, you'll brick the probe.
Don't worry, smart people have already put a checklist to restore a working firmware and even update it to the latest official version. I just put all the needed info into one single page. Unbrick it To restore the firmware, you need to follow the instruction from The best part? It works from Linux. For the step 9, you'll need the binary image to flash; use that one. It's from the same forum than above but without password and without additional useless.exe files. Download and install SAM-BA package from atmel.com.
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Open the j-link case by gently popping the plastic edge near the jtag or usb ports. Identify the ERASE (pin 50) / TST (pin 40) jumpers/pins. Short ERASE jumper to pull-high and connect the jlink to usb; wait for a minute and disconnect usb.
('pull-high', means set a jumper between the ERASE pin and the 3.3V pin next to it.). Remove the ERASE jumper and short the TST jumper to pull-high and connect the jlink to usb; wait for a minute and disconnect usb. Break/remove the TST jumper and reconnect USB.
Your jlink should now be identified as AT91 USB to serial adapter and a COM port should be assigned to it - if this doesn't happen repeat from step 3. Something like cdcacm 1-1.2:1.0: ttyACM0: USB ACM device should appear in syslog or dmesg. Open SAM-BA program; select COM/ttyACM port that was assigned to your jlink and in board select 'at91sam7s64-ek'; click CONNECT. Select 'FLASH' and select the BIN file you downloaded before and select to load the firmware into flash; the application will ask you if you want to unlock - select YES; at the end of programming there will be a similar question if you want to lock - select NO! (very important).
Congratulations, you are done. Reconnect the device and you should have a working jlink Update the firmware The previous step will reflash with a firmware from 2009. Info: J-Link ARM V8 compiled May 27 2009 17:31:22 Quite old and I prefer to have the latest one. Fortunately, the firmware you just flashed has a fake SerialNumber set to -1 and it happens to be enough to let the J-Link Configurator tool to flash it to the latest firmware without bricking it. This time you'll need a windows machine.
I used a Windows10 image under vmware and it worked fine. go to and fetch the Windows software pack. The one I used was version 5.00g. install it and run the J-Link Configurator. It should detect the probe and allow you to update it to the latest firmware. Congratulations, you are done. Reconnect the device and you should have a working J-Link this the latest firmware Info: J-Link ARM V8 compiled Nov 28 2014 13:44:46 Edit1 While origin of the binary firmware used in this tuto remains unknown, several posts suggest to modify the 'GDBFull' string to either 'GDBFULL' or 'GDB' From: After found the BIN file, you have to open it with an hex editor and change the string 'GDBFull' with 'GDB' and also change the serial number.
As far as I remember the serial number is not a string but just raw hex data nearby the address where the 'GDBFull' string is located. Remember the raw data are little-endian. For the new serial number use something like '4054xxxx' where xxxx are random numbers. You need to change the serial number or you will get this error message about the device being 'defective'. I highly suggest that you DO NOT upgrade the firmware to a newer version until you first establish your own unique serial number (one that hasn't been 'blacklisted'). Only then will you be guaranteed success. To do that you use the 'J-Link Commander' program.
The serial number is NOT stored in the binary firmware file. It gets stored in the EEPROM of the SAM7S64 chip. The newer J-Link DLLs will cause the 'error message' if they see a serial number hasn't been set or if the serial number is one that is known to be used for 'fake' devices. You use the 'J-Link Commander' to set the serial: 1) Start J-Link Commander. 2) At the prompt, enter (without the quotation marks): 'Exec SetSN = xxxxxxxx'. Choose an eight digit number, in place of the 'x's in that command, perhaps something in the range of 37000000 to 45000000 range. 3) Hit enter so it stores that in your j-link device.
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4) Exit J-Link Commander (type: 'exit' and hit ). 5) Run J-Link Configurator and upgrade the firmware. You should see the serial number that you set from now on (not -1 and )! Now your device should work without problems. I wasted a lot of time trying to inject serial numbers into the binary firmware file. It doesn't live there and I hope that you don't end up losing a lot of time doing the same. There is a lot of different methods found online to erase the Atmel chip in the j-link.
Atmel has their procedure for erasing the chip and restoring the bootloader. This is how it should be: Power the device. Put the ERASE jumper on. Wait at least one second. Remove power. Now, with the power OFF remove the ERASE jumper and instead apply the TST jumper instead.
Power the device and WAIT AT LEAST 10 SECONDS (the bootloader is being transferred internally in the chip at this time). Remove power. Now remove the TST jumper. Now when connected to your computer, the device should show up as a device that the ATMEL Sam-ba program can talk to. This will be the best way to start fresh, so you can load the old (2009) firmware that allows for an upgrade. Again, remember to only attempt the upgrade to a newer version of j-link firmware AFTER you have established your own, new Serial Number.!! One other thing that I forgot to mention.
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It is probably necessary to use a binary file editor and change the 'old' firmware (2009 version) so that the string 'GDBFull' is altered. I substituted four space characters in place of the 'Full' part and it worked. Seems like others used all-caps for the rest of 'Full' instead (result: GDBFULL).
It could be that the upgrade process will key on the lower case version and know that it 'isn't proper'.!? Pierre, I would like to suggest that you post a binary file with the string edited to be GDBFULL or just GDB instead of the file that is there now.
It would make it easier for everyone downloading that by removing the steps needed to edit the file.! Regardless, ENORMOUS THANKS for providing the file that is there currently!!!!!
I found a workaround to debug Keil software with H-JTAG(free). How to configure KEIL(uVision3.51) with JTAG? In Keil, open ProjectOptions for targetDebugUse RDI interface DriverSettingsBrowser and search for Yr. H-JTAG.dll in approprite folder. With a cheap Olimex Wiggler it could work like a true debugger(tracing, stepping and so on).
But watch out, unless You're a pro, practice a lot. I actually used the H-JTAG v. 9 and - beside that Segger couldn't either download or debug my code- I was able to download my code via the RS232 interface and later correct the code until it was errorfree and, again download the correct code. Don't fret, there's always a workaround cheap JTAG stuff Godd luck « Last Edit: July 02, 2009, 08:44:04 08:44 by robban » Logged. This is the question. In the ARM toolset there are: 1.
Display functions. SPI and I2C functions. CAN functions.
Elemental IO functions. Send profile data (??). If you are interested in more details what is available, on the NI site there is 374931b.pdf file 'Getting Started with the LabVIEW Embedded module for ARM.
I'm quoting from this doc: 'New Memory Access VIs The Embedded Module for ARM Microcontrollers now includes a Memory Access palette, which includes the following VIs:. CCG Mem Peek 8. CCG Mem Peek 16. CCG Mem Peek 32. CCG Mem Poke 8. CCG Mem Poke 16.
CCG Mem Poke 32 Use these VIs to read and write values to specific memory addresses.' Is it sufficient?
The J-Link software comes with an additional feature, called Unlimited Flash Breakpoints. Unlimited Flash Breakpoints allow the user to set an unlimited number of breakpoints when debugging in flash memory.
The J-Link software comes with an additional feature, called Unlimited Flash Breakpoints. Unlimited Flash Breakpoints allow the user to set an unlimited number of breakpoints when debugging in flash memory. Without this feature, the number of breakpoints which can be set in flash is limited to the number of hardware breakpoints supported by the debug unit of the CPU (2 on ARM 7/9, 4-6 on Cortex-M).
J-Link's 'Unlimited flash breakpoints' works in both internal and external flash, even memory mapped QSPI flashes! J-Link has a smart strategy of using hardware breakpoints as much as possible, but once the CPU runs out of hardware breakpoints, J-Link automatically uses Flash breakpoints.1
J-Link's 'Unlimited flash breakpoints' actually work even in situations where hardware breakpoints can not be used, such as external memory or memory mapped QSPI flashes that are outside of the area on which hardware breakpoints can be set. On most Cortex-M3 and M4 devices, hardware breakpoints can not be used on external memory, 'J-Link's Unlimited flash breakpoints' can.
1 J-Link PLUS, J-Link ULTRA+ or J-Link PRO required
SEGGER J-Link Flash Breakpoint Introduction
There are basically 2 types of breakpoints in a computer system: Hardware breakpoints and software breakpoints. Hardware breakpoints require a dedicated hardware unit for every breakpoint. In other words, the hardware dictates how many hardware breakpoints can be set simultaneously. ARM7, ARM9, and some devices implemented with the Cortex-M0+ cores have 2 breakpoint units (called 'watchpoint units' in ARM's documentation), allowing 2 hardware breakpoints to be set. Hardware breakpoints do not require modification of the program code. Software breakpoints are different: The debugger modifies the program and replaces the breakpointed instruction with a special value. Additional software breakpoints do not require additional hardware units in the processor, since instructions are replaced inside the code to indicate the breakpoint. This is a standard procedure that most debuggers are capable of, however, it requires the program to be located in RAM.
A: Yes! On some CPUs it is the only way to set breakpoints in external flash memory. For example, in Cortex-M systems, the typical 6 hardware breakpoints of the Flash-Patch Unit can NOT be used to set breakpoints in external memory on most Cortex-M system, since the address range of the unit is limited. This means: If you are using a Cortex-M3 or M4 with external flash, a program in this external flash can not be debugged with the popular emulators except a J-Link with the 'Unlimited Flash Breakpoint' license. In other words: When debugging a program in external flash on a Cortex-M device, a J-Link with the 'Unlimited Flash Breakpoint' license such as J-Link ULTRA+ is almost a must.
A: Unlimited Flash Breakpoints allow you to set an unlimited number of breakpoints even if your application program is not located in RAM, but in flash memory. This is a scenario which was very rare before ARM-microcontrollers hit the market. This new technology makes very powerful, yet inexpensive ARM microcontrollers available for systems, which required external RAM before. The downside of this new technology is that it is not possible to debug larger programs on these micros in RAM, since the RAM is not big enough to hold program and data (typically, these chips contain about 4 times as much flash as RAM), and therefore with standard debuggers, only 2 breakpoints can be set. The 2 breakpoint limit makes debugging very tough; a lot of times the debugger requires 2 breakpoints to simply step over a line of code. With software breakpoints in flash, this limitation is gone.
A: Basically very simple:
The J-Link software reprograms a sector of the flash to set or clear a breakpoint.
A: A RAM Code, specially designed for this purpose, sets and clears Flash Breakpoints extremely fast; on micros with fast flash the difference between breakpoints in RAM and flash is hardly noticeable.
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A: We have put a lot of effort in making Unlimited Flash Breakpoints really usable and convenient. Flash sectors are programmed only when necessary; this is usually the moment that the execution of the target program is started. A lot of times more than one breakpoint is located in the same flash sector, which allows programming multiple breakpoints by programming just a single sector. The contents of program memory are cached, avoiding time consuming reading of the flash sectors. A smart combination of software and hardware breakpoints allows us to use hardware breakpoints a lot of times, especially when the debugger is source level-stepping, avoiding reprogramming flash in these situations. A built-in instruction set simulator further reduces the number of flash operations which need to be performed. This minimizes delays for the user, maximizing the life time of the flash. All resources of the ARM micro are available to the application program, no memory is lost for debugging. All of the optimizations described above can be disabled.
A: The software is licensed on a per J-Link basis. It requires a J-Link with Flash Breakpoints. J-Link Flash Breakpoints can also be used with J-Link ARM RDI / RDDI and J-Link GDB Server. If you want to use Flash Breakpoints with J-Link ARM RDI / RDDI, you will need an additional license for this software component too.
In order to receive your free 30 days trial license, please send an e-mail including the J-Link serial number to: [email protected]
A: Unlimited Flash Breakpoints can be used with the following J-Link software components:
- J-Link DLL (For example if you use the J-Link DLL natively in IAR Embedded Workbench for ARM or RealView® MDK)
- J-Link ARM RDI / RDDI
For more information about how to use Flash Breakpoints with the different software components, please refer to the corresponding manuals.