To configure the J-Link/J-Trace adapter for Flash download: Choose Flash — Configure Flash Tools. From the menu, to open the Project — Options for Target — Utilities dialog. Warning: Your IP address 207.46.13.235 is public! Your Internet Provider, Government or hackers can very easily track all your activity! Enable protection. J-Flash is a stand-alone flash programming software for PCs running Microsoft Windows. J-Flash has an intuitive user interface and makes programming flash devices convenient. J- Flash requires a J-Link / Flasher, JTAG emulator for ARM cores, to interface to the hardware. ARM’s MDK Version 5.20 software dev kit is split into the MDK Core and Software Packs. Order the Professional, Standard, or Cortex-M edition at Digi-Key! Segger J Flash J link arm keygen.

• J-flash Keygen
• J-flash Keygen

J-Link Commander (JLink.exe / JLinkExe) is a free, command line based utility that can be used for verifying proper functionality of J-Link as well as for simple analysis of the target system with J-Link. It supports some simple commands, such as memory dump, halt, step, go etc. to verify the target connection. The J-Link Commander is part of the J-Link Software and Documentation Pack, which is available for download on the SEGGER webpage.

The sources of the J-Link Commander are available as part of the J-Link SDK.

• 1Commands
  • 1.1Detailed description
• 2Command line options
  • 2.1Detailed description
• 10Command specifics

Commands

The table below lists the available commands of J-Link Commander. All commands are listed in alphabetical order within their respective categories.Detailed descriptions of the commands can be found in the sections that follow.

Detailed description

Following is a detailed description with syntax explaination and examples of the commands listed above.

clrBP

This command removes a breakpoint set by J-Link.

Syntax

Example

clrWP

This command removes a watchpoint set by J-Link.

Syntax

Example

connect

This command establishes a connection between J-Link and target.

Note
If not set already, this command will prompt the user for settings which are needed in order to connect to the target.

Syntax

device

Selects a specific device J-Link shall connect to and performs a reconnect.In most cases explicit selection of the device is not necessary.Selecting a device enables the user to make use of the J-Link flash programming functionality as well as using unlimited breakpoints in flash memory.For some devices explicit device selection is mandatory in order to allow the DLL to perform special handling needed by the device.Some commands require that a device is set prior to use them.

Syntax

Example

erase

Erases all flash sectors or a certain flash range of the current device. A device has to be specified previously.When specified, all flash between the <StartAddr> and <EndAddr> will be erased.

Syntax

exec

Execute J-Link Command String. For more information about the usage of J-Link Command Strings please refer to J-Link Command Strings.

Syntax

Example

exit

This command closes the target connection, the connection to the J-Link and exits J-Link Commander.

Syntax

exitonerror

This command toggles whether J-Link Commander exits on error or not.

Syntax

Example

f

Prints firmware and hardware version info. Please notice that minor hardware revisions may not be displayed, as they do not have any effect on the feature set.

Syntax

fdelete

On emulators which support file I/O this command deletes a specific file.

Syntax

J-flash Keygen

Example

flist

On emulators which support file I/O this command shows the directory tree of the Flasher.

Syntax

fread

On emulators which support file I/O this command reads a specific file.Offset applies to both destination and source file.

Syntax

Example

fshow

On emulators which support file I/O this command reads and prints a specific file.Currently, only Flasher models support file I/O.

Syntax

Example

fsize

On emulators which support file I/O this command gets the size of a specific file.Currently, only Flasher models support file I/O.

Syntax

Example

fwrite

On emulators which support file I/O this command writes a specific file.Currently, only Flasher models support file I/O. NumBytes is limited to 512 bytes at once.This means, if you want to write e.g. 1024 bytes, you have to send the command twice,using an appropriate offset when sending it the second time. Offset applies to both destination and source file.

Syntax

Example

go

Starts the CPU. In order to avoid setting breakpoints it allows to define a maximum number of instructions which can be simulated/emulated.This is particularly useful when the program is located in flash and flash breakpoints are used. Simulating instructions avoids to reprogram the flash and speeds up (single) stepping.

Syntax

Example

halt

Halts the CPU Core. If successful, shows the current CPU registers.

Syntax

hwinfo

This command can be used to get information about the power consumption of the target (if the target is powered via J-Link). It also gives the information if an overcurrent happened.

Syntax

ip

Closes any existing connection to J-Link and opens a new one via TCP/IP. If no IP Address is specified, the Emulator selection dialog shows up.

Syntax

Example

is

This command returns information about the length of the scan chain select register.

Syntax

jtagconf

Configures a JTAG scan chain with multiple devices on it.
For more detailed information on how to configure a scan chain with multiple devices please refer to Determining values for scan chain configuration.

Syntax

Example

loadfile

This command programs a given data file to a specified destination address. Currently supported data files are:

• *.mot
• *.srec
• *.s19
• *.s
• *.hex
• *.bin

Syntax

Example

log

Syntax

Example

mem

The command reads memory from the target system. If necessary, the target CPU is halted in order to read memory. Zone names will be displayed on first connect to target with J-Link commander if available.

Syntax

Example

or

mem8

The command reads memory from the target system in units of bytes. If necessary, the target CPU is halted in order to read memory.

Syntax

Example

mem16

The command reads memory from the target system in units of 16-bits. If necessary, the target CPU is halted in order to read memory.

Syntax

Example

mem32

The command reads memory from the target system in units of 32-bits. If necessary, the target CPU is halted in order to read memory.

Syntax

Example

mem64

The command reads memory from the target system in units of 64-bits. If necessary, the target CPU is halted in order to read memory.

Syntax

Example

mr

Measure reaction time of RTCK pin.

Syntax

Example

ms

Measures the number of bits in the specified scan chain.

Syntax

Example

power

This command sets the status of the power supply over pin 19 of the JTAG connector. The KS(Kickstart) versions of J-Link have the 5V supply over pin 19 activated by default. This feature is useful for some targets that can be powered over the JTAG connector.

Syntax:

Example

r

Resets and halts the target.

Syntax

readAP

Reads from a CoreSight AP register. This command performs a full-qualified read which means that it tries to read until the read has been accepted or too many WAIT responses have been received. In case actual read data is returned on the next read request (this is the case for example with interface JTAG) this command performs the additional dummy read request automatically.

Syntax

Example

readcsr

Reads a specific CSR (Control Status Register) on a RISC-V based target.

Syntax

Example

readDP

Reads from a CoreSight DP register. This command performs a full-qualified read which means that it tries to read until the read has been accepted or too many WAIT responses have been received. In case actual read data is returned on the next read request (this is the case for example with interface JTAG) this command performs the additional dummy read request automatically.

J-flash Keygen

Syntax

Example

regs

Shows all current register values.

Syntax

rnh

This command performs a reset but without halting the device.

Syntax

rreg

The function prints the value of the specified CPU register.

Syntax

Example

rx

Resets and halts the target. It is possible to define a delay in milliseconds after reset. This function is useful for some target devices which already contain an application or a boot loader and therefore need some time before the core is stopped, for example to initialize hardware, the memory management unit (MMU) or the external bus interface.

Syntax

Example

savebin

Saves target memory into binary file.

Syntax

Example

setBP

This command sets a breakpoint of a specific type at a specified address. Which breakpoint modes are available depends on the CPU that is used.

Syntax

Example

setPC

Sets the PC to the specified value.

Syntax

Example

SetTimeoutCmd

Set timeout in milliseconds for a specific command.

Note
Right now only stepover is supported

Syntax

Example

setWP

This command inserts a new watchpoint that matches the specified parameters.The enable bit for the watchpoint as well as the data access bit of the watchpoint unit are set automatically by this command.Moreover the bits DBGEXT, CHAIN and the RANGE bit (used to connect one watchpoint with the other one) are automatically masked out.In order to use these bits you have to set the watchpoint by writing the ICE registers directly.

Syntax

Example

si

This command selects a target interface.

Syntax

Example

sleep

Waits the given time (in milliseconds).

Syntax

Example

st

This command prints the current hardware status. Prints the current status of TCK, TDI, TDO, TMS, TRES, TRST and the interface speeds supported by the target. Also shows the Target Voltage.

Syntax

step

Target needs to be halted before calling this command.Executes a single step on the target.The instruction is overstepped even if it is breakpointed. Prints out the disassembly of the instruction to be stepped.

Syntax

stepover

Target needs to be halted before calling this command.Executes a stepover on the target, similar how a debugger does it. The instruction is overstepped even if it is breakpointed.Prints out the disassembly of the instruction to be stepped over. By default this command has a timeout of five seconds.

Note
For more information see SetTimeoutCmd

Syntax

unlock

This command unlocks a device which has been accidentally locked by malfunction of user software.

Syntax

Example

usb

Closes any existing connection to J-Link and opens a new one via USB. It is possible to select a specific J-Link by port number.

Syntax

Example

verifybin

Verifies if the specified binary is already in the target memory at the specified address.

Syntax

Example

VCOM

Enables or disables the VCOM of the J-Link (if the probe supports VCOM).
After changing the configuration a power cycle of the debug probe is necessary in order for the new configuration to take effect.

Syntax

Example

VTREF

Sets a fixed value for VTref on J-Link.The Value of VTref can be set between 1200 mV and 3300 mV all values that exceed 3300 mV will be limited to 3300 mV, values smaller than 1200 mV deactivate fixed VTref.Settings of fixed VTref apply nonvolatile after power cycling the probe.

Syntax

Example

Note
The command overrides the VTref pin and once set the pin will be ignored. To activate the pin again call the VTREF command with a voltage of 0V.

w1

The command writes one single byte to the target system.

Syntax

Example

w2

The command writes a unit of 16-bits to the target system.

Syntax

Example

w4

The command writes a unit of 32-bits to the target system.

Syntax

Example

WebUSBDisable

Disables WebUSB on J-Link. The WebUSB configuration applies nonvolatile after power cycling the probe.

Syntax

WebUSBEnable

Enables WebUSB on J-Link. The WebUSB configuration applies nonvolatile after power cycling the probe.

Syntax

writeAP

Writes to a CoreSight AP register. This command performs a full-qualified write which means that it tries to write until the write has been accepted or too many WAIT responses have been received.

Syntax

Example

writecsr

Writes a specific CSR (Control Status Register) on a RISC-V based target.

Note
Writes to known CSRs (like X1) may not be written to HW directly but with the next g or s command.

Syntax

Example

writeDP

Writes to a CoreSight DP register.This command performs a full-qualified write which means that it tries to write until the write has been accepted or too many WAIT responses have been received.

Syntax

Example

wreg

Writes into a register. The value is written into the register on CPU start.

Syntax

Example

Command line options

J-Link Commander can be started with different command line options for test and automation purposes.In the following, the command line options which are available for J-Link Commander are explained.All command line options are case insensitive.

Detailed description

Following is a detailed description with syntax and examples of the command lines listed above.

-AutoConnect

This command can be used to let J-Link Commander automatically start the connect sequence for connecting to the target when entering interactive mode.

Syntax

Example

-CommanderScript

Similar to -CommandFile.

-CommandFile

Selects a command file and starts J-Link Commander in batch mode. The batch mode of J-Link Commander is similar to the execution of a batch file.The command file is parsed line by line and one command is executed at a time.

Syntax

Example

See Using J-Link Command FIles.

-Device

Pre-selects the device J-Link Commander shall connect to.For some devices, J-Link already needs to know the device at the time of connecting, since special handling is required for some of them.For a list of all supported device names, please refer to List of supported target devices.

Syntax

Example

Additional information

Selecting 'default' as <DeviceName> will select the last known connected device.

-ExitOnError

Similar to the exitonerror command.

-If

Selects the target interface J-Link shall use to connect to the target.By default, J-Link Commander first tries to connect to the target using the target interface which is currently selected in the J-Link firmware.If connecting fails, J-Link Commander goes through all target interfaces supported by the connected J-Link and tries to connect to the device.

Syntax

Example

-IP

Selects IP as host interface to connect to J-Link. Default host interface is USB.

Syntax

Example

Additional information

-JLinkScriptFile

Passes the path of a J-Link script file to the J-Link Commander.J-Link scriptfiles are mainly used to connect to targets which need a special connection sequence before communication with the core is possible.For more information about J-Link script files, please refer to J-Link Script Files.

Syntax

Example

-JTAGConf

Passes IRPre and DRPre in order to select a specific device in a JTAG-chain. “-1,-1” can be used to let J-Link select a device automatically.

Syntax

Example

-Log

Set path to LogFilePath allowing the DLL to output logging information.If the logfile already exists, the contents of the current logfile will be overwritten.

Syntax

Example

-NoGui

Starts the J-Link Commander in 'no GUI'-mode.Please note that license dialogs are not suppressed in this mode.

Syntax

Example

NOTE:This command is not yet available. It will be available for Version 6.71d (beta) and V6.74 (release) or later, of the Software and Documentation Pack.

-RTTTelnetPort

This command alters the RTT telnet port. Default is 19021.

Syntax

Example

-USB

Connect to a J-Link with a specific serial number via USB.Useful if multiple J-Links are connected to the same PC and multiple instances of J-Link Commander shall run and each connects to another J-Link.

Syntax

Example

-SettingsFile

Select a J-Link settings file to be used for the target device.The settings file can contain all configurable options of the Settings tab in J-Link Control panel.

Syntax

Example

-Speed

Starts J-Link Commander with a given initial speed. Available parameters are “adaptive”, “auto” or a freely selectable integer value in kHz.It is recommended to use either a fixed speed or, if it is available on the target, adaptive speeds.Default interface speed is 100kHz.

Syntax

Example

Using J-Link Command Files

J-Link commander can also be used in batch mode which allows the user to use J-Link commander for batch processing and without user interaction.Please do not confuse J-Link Command Files file with J-Link Script Files.When using J-Link commander in batch mode, the path to a command file is passed to it.The syntax in the command file is the same as when using regular commands in J-Link commander (one line per command).SEGGER recommends to always pass the device name via command line option due some devices need special handling on connect/reset in order to guarantee proper function.

Example

Contents of CommandFile.jlink:

Perform flash download

J-Link Commander allows to download data files of different types into the flash memory of the target systems.

• Connect J-Link to the PC
• Connect target system to J-Link
• Start J-Link Commander
• Enter the requested settings (e.g. target device, interface settings, etc...)
• Type the following commands:
  • r
  • loadfile <PathToFile> [<DestAddr>]
• J-Link Commander executes the flash download and prints out the time statistics on success.

Batch processing

Basically, some target configuration settings needs to be specified in J-Link Commander before a target connection can be established. However, the J-Link Commander comes with multiple command line options as well as a so called J-Link Commander Command Script mode, which allows using J-Link Commander in batch processing mode, so that it can be used fully automatic.

The table below describes the different command line arguments, which can be used to run the commander, without the need to input any configuration / commands:

Example:

JLink.exe return value

The return value of the J-Link Commander application (JLink.exe) can be read out int the environment variable ERRORLEVEL.

Examples:

1. Returns an Error (ERRORLEVEL 1)

2. Returns no Error (ERRORLEVEL 0)

For information how to access the environment variable ERRORLEVEL within a java application please refer to:http://stackoverflow.com/questions/8922485/how-to-execute-echo-errorlevel-in-java

For further information regarding this, please refer to:http://blogs.msdn.com/b/oldnewthing/archive/2008/09/26/8965755.aspx

Using J-Link Command Strings

In order to use J-Link Command Strings in J-Link Commander, the native J-Link Commander command exec supplemented by one of the available J-Link Command Strings can be used.

Example:

Connecting to a specific J-Link

It is possible to have multiple J-Links connected to the PC at the same time (for more information, see here. To connect to a specific J-Link in an automated way (no user interaction required), J-Link Commander needs to be told the S/N of the J-Link to connect to. This can be done via two different methods:

• Specify the S/N directly via command line. See -SelectEmuBySN above for more information.
• Specify 'SelectEmuBySN <SN>' (without quotes) as first command in the J-Link command file that is passed to J-Link Commander via command line

Setup External CFI NOR Flash

J-Link Commander supports downloading bin files into external CFI flash memory. In the following, it is explained which steps are necessary to prepare J-Link Commander for download into external CFI flash memory based on a sample sequence for a ST STM32F103ZE device:

Command specifics

Verifybin command

The verifybin command in J-Link Commander executes a simple read of memory and compares the data against the data in the specified bin file. Note that *no* initialization of any flash interface etc. is done on this command. For external QSPI flash for example this means that the pins and the QSPI controller of the target MCU have to be already initialized etc. for this command to succeed. This is different for 'loadbin' which may trigger a flash download implicitly where a flash loader is started that takes care of the initialization.Also note that executing a 'loadbin' command in advance, does not guarantee that a 'verifybin' succeeds because the loadbin commands restores the controller state after it is done. So if the QSPI controller and/or pins were not initialized before the 'loadbin' command, they are not after it either. They are only available while 'loadbin' is active.