In addition to SEGGER's products for stand-alone programming, J-Flash is a software solution that allows a J-Link to be used as production tool. The software tool J-Flash is a port of every J-Link Plus package and all higher J-Link models. Stand-alone programming software for a variety of microcontrollers and external flashes. Segger J Flash Arm Keygen Generator Average ratng: 8,4/10 5823 votes When using a bootloader (see “Serial Bootloader for the Freedom Board with Processor Expert“), then I usually protect the bootloader FLASH areas, so it does not get accidentally erased by the application;-).
- SEGGER Microcontroller Systems LLC Boston area 101 Suffolk Lane Gardner, MA 01440 United States of America 060 -060 Tel: +1-978-874-0299.
- SEGGER Embedded Studio may be licensed to a J-Link / J-Trace unit. If you would like to use SEGGER Embedded Studio with more than one J-Link unit, a license must be purchased for each device to be used. If you currently have a J-Link or J-Trace unit, please select the radio option to enter the serial number below and then enter the serial.
- SEGGER TOOLS Flasher Flash programmer Flash Programming tool primarily for microcon-trollers. J-Link JTAG emulator for ARM cores USB driven JTAG interface for ARM cores. J-Trace JTAG emulator with trace USB driven JTAG interface for ARM cores with Trace memory. Supporting the ARM ETM (Embed-ded Trace Macrocell). J-Link / J-Trace Related Software.
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.
Can I Use Unlimited Flash Breakpoints in CFI NOR Flash?
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.
How Does this Work?
A: Basically very simple:
The J-Link software reprograms a sector of the flash to set or clear a breakpoint.
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.
How is This Performance Achieved?
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].
In order to receive your free 30 days trial license, please send an e-mail including the J-Link serial number to: [email protected].
Can I use Unlimited Flash Breakpoints with Different Software Components
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.
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entrancementcentral.netlify.com › ★ ★ ★ Segger J Flash Arm Keygen Generator
When using a bootloader (see “Serial Bootloader for the Freedom Board with Processor Expert“), then I usually protect the bootloader FLASH areas, so it does not get accidentally erased by the application ;-). When programming my boards with the P&E Multilink, then the P&E firmware will automatically unlock and erase the chip. That’s not the same if working with the Segger J-Link, as it but requires extra steps.
If I try to re-program the protected bootloader with Segger J-Link (both in CodeWarrior and Eclipse/KDS with GDB), then the download silently fails. The effect is that somehow the application on the board does not match what it should be. Looking at the Console view, it shows that erase has failed (but no real error reported) :-(:
Vampire diaries soundtrack free download zip. J-Link Failed to Erase in CodeWarrior
The GNU ARM Eclipse Segger integration with GDB (e.g. Kinetis Design Studio) is not better: no error sign, the only thing is a hidden ERROR in the Console log of the JLinkGDBServerCL:
ERROR Algo135 Flash Protection Violation about failed FLASH Programming
What I need is to unprotect the memory and then erase it.
The Segger J-Link features a very fast programming. Part of that speed is that the Segger firmware checks each FLASH page if it really needs to be programmed, and only then it erases and reprogrammed that page. So downloading twice the same application actually will not touch the FLASH memory at all. Additionally, it does not do a complete erase of the device: it only programs the pages I’m using in my application. The advantage of that is first speed. And it does not erase the application data I’m using in non-volatile memory (see “Configuration Data: Using the Internal FLASH instead of an external EEPROM“). However, sometimes I really need to clear all my data in FLASH too, and then I need to erase all my FLASH pages on the device.
Segger has product named ‘J-Flash’ which is used to Flash and Erase devices outside of an IDE. There is a free-of-charge ‘Lite’ version available for download from Segger. This utility is not intended to be used for production. With this utility I have a GUI to erase and program my device.
But J-Flash Lite cannot unlock my locked FLASH pages :-(.
If my device is not locked, I can use the CodeWarrior ‘Flash file to target’ (see “Flashing with a Button (and a Magic Wand)“) to erase the device:
Erasing Device with Flash File to Target
Segger J-flash Arm
Again, this does not work if the device is locked. CodeWarrior has another feature called ‘Target Task’ which can be used to erase/unsecure (if your device is supported), see “Device is secure?“.
So I need to use a different tool to unlock and unprotect my device: the J-Link Commander.
To unlock the device, Segger has a utility named ‘J-Link Commander’, available from http://www.segger.com/jlink-software.html. The binary is ‘jlink.exe’ on Windows and is a command line utility. To unlock the device use
Segger J Flash Software
But it seems that I need to do an unlock, followed by an erase to make it permanent. To erase the device, I can use the same command line utility. But I need to specify the device name first, and then I can erase it (example for the KL25Z):
❗ I need to do the erase operation right after the unlock. a) set device b) unlock and c) erase, otherwise it will fail?
Unlocking and Erasing with J-Link Commander
In order to re-program the protected FLASH sectors with Segger J-Link, I need first to unlock and mass erase the device. For this, there is the J-Link Commander utility which has a command line interface to unprotect and erase the device. For erasing only, the J-Flash (and Lite) is a very useful tool, especially to get a ‘clean’ device memory.
Segger Download
To me, the Segger way and tools are very powerful. In this case, things are very flexible, but not that obvious. So I hope this post can help others to get his device unlocked and erased.
Segger J Flash Download
Happy Erasing ?