Jlink commander使用方法（附指令大全）

作者：笔触狂放9 | 2024-05-31 11:45:01

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jlink commander

Jlinkcmd它可以方便用户在非仿真的情况下，hold内核、单步、全速、设置断点、查看内核和外设寄存器、读取flash代码等等，方便大家拥有最高的权限查看在运行中的MCU情况，查找非IDE仿真情况下，MCU运行异常的原因。

驱动安装

Jlink相关文档及软件资料见如下官网网址：

SEGGER - The Embedded Experts - Downloads - J-Link / J-Trace

Jlink驱动下载可选如下官网网址：

SEGGER - The Embedded Experts - Downloads

打开Jlinkcmd

我们可以在开始菜单打开Jlinkcmd；

也可以在安装目录中打开Jlinkcmd；

还可以在KEIL软件中debug窗口中打开；

建立连接

1.输入connect建立连接；

2.输入芯片型号，直接回车可以选择默认选项；

3.根据实际情况选择JTAG或者SWD；

4.设置下载速度，直接回车可以选择默认选项；

正确的连接目标芯片后：

识别到内核，并通知“已识别”。

常用指令

Mem 读内存

mem8 读8比特内存

mem16 读16比特内存

mem32 读32比特内存

w1 写8比特内存

w2 写16比特内存

w4 写32比特内存

h 停止cpu运行的程序

setbp 设置断点

g 跳到代码段地址执行

s 单步执行（调试用）

r 复位

q 退出

实测举例

由以上指令运行结果可简单看出，PC初始值为0x080001E0，运行结束后指向0x08001764；

由以上指令运行结果可简单看出，地址0x00000004存储的值为：0x080001E1，地址0x08000004存储的值为：0x080001E1

指令大全

Command (long)	Command (short)	Explanation
Basic
?	?	Show information about all or specific commands
Exit	Exit	Close J-Link connection and quit
ExitOnError	EoE	Exit on error
Sleep	Sleep	Waits the given time (in milliseconds)
Log	Log	Enables log to file
ExpDevList	ExpDevList	Export device names from DLL internal device list to text file
ExpDevListXML	ExpDevListXML	Export device names from DLL internal device list to XML file
Configuration - J-Link
USB	USB	Connect to J-Link via USB
IP	IP	Connect to J-Link via TCP/IP or to Remote Server
SelectProbe	SelPrb	Show list of all connected probes via specified interface. The Probe to communicate with can then be selected
ShowEmuList	ShowEmuList	Show list of all connected probes via specified interface
Power	Power	Switch power supply for target (5V-Supply pin) on or off
VTREF	VTREF	Set fixed value for VTref on J-Link
VCOM	VCOM	Enable/disable VCOM Takes effect after power cycle of the probe
Reboot	Reboot	Reboots the connected probe.
ShowFWInfo	F	Show firmware info
ShowHWStatus	St	Show hardware status
License	License	Show list of all available license commands
IPAddr	IPAddr	Show/Assign IP address and subnetmask of/to connected Probe
GWAddr	GWAddr	Show/Assign network gateway address of/to connected Probe
DNSAddr	DNSAddr	Show/Assign network DNS server address of/to connected Probe
ShowConf	Conf	Show configuration of the connected Probe
Calibrate	Calib	Calibrate the target current measurement
Configuration - Target (CPU)
Connect	Con	Connect to target device
Device	Device	Select specific device J-Link shall connect to
SelectInterface	SI	Select target interface
Speed	Speed	Set target interface speed
LE	LE	Change mode to little endian
BE	BE	Change mode to big endian
Debugging
Halt	H	Halt CPU
IsHalted	IH	Return current CPU state
WaitHalt	WH	Wait until CPU is halted or timeout is reached
Go	G	Start CPU if halted
Reset	R	Reset CPU
ResetX	RX	Reset CPU with delay after reset
RSetType	Rst	Set the current reset type
Step	S	Execute step(s) on the CPU
IS	IS	Identify length of scan chain select register
MS	MS	Measure length of scan chain
Regs	Regs	Display CPU register contents
RReg	RReg	Read register
WReg	WReg	Write register
MoE	MoE	Shows mode-of-entry (CPU halt reason)
SetBP	SetBP	Set breakpoint
ClearBP	ClrBP	Clear breakpoint
SetWP	SetWP	Set watchpoint
ClearWP	ClrWP	Clear watchpoint
VCatch	VC	Write vector catch
SetPC	SetPC	Set the PC to specified value
ReadAP	ReadAP	Read CoreSight AP register
WriteAP	WriteAP	Write CoreSight AP register
ReadDP	ReadDP	Read CoreSight DP register
WriteDP	WriteDP	Write CoreSight DP register
RCP15Ex	RCE	Read CP15 register
WCP15Ex	WCE	Write CP15 register
Term	Term	Visualize printf output using DCC (SEGGER DCC handler running on target)
Debugging - Memory operation
Mem	Mem	Read memory and show corresponding ASCII values
Mem8	Mem8	Read 8-bit items
Mem16	Mem16	Read 16-bit items
Mem32	Mem32	Read 32-bit items
Write1	W1	Write 8-bit items
Write2	W2	Write 16-bit items
Write4	W4	Write 32-bit items
Debugging - JTAG related
JTAGConf	JTAGConf	Set number of IR/DR bits before Target device
JTAGId	I	Read JTAG Id
WJTAGIR	WJIR	Write JTAG command (IR)
WJTAGDR	WJDR	Write JTAG data (DR)
WJTAGRaw	WJR	Write Raw JTAG data
ResetTAP	RTAP	Reset TAP Controller using state machine (111110)
ResetTRST	RT	Reset TAP Controller using nTRST
Debugging - ICE
ICE	ICE	Show state of the embedded ICE macrocell (ICE breaker)
ReadICE	RI	Read Ice register
WriteICE	WI	Write Ice register
TRACE
TClear	TC	Clear TRACE buffer
TSetSize	TSS	Set TRACE size of trace buffer
TSetFormat	TSF	Set TRACE Format
TShowRegions	TSR	Show TRACE Regions (and analyze trace buffer)
TStart	TStart	Start TRACE
TStop	TStop	Stop TRACE
SWO
SWOSpeed	SWOSpeed	Show supported SWO speeds
SWOStart	SWOStart	Start SWO
SWOStop	SWOStop	Stop SWO
SWOStat	SWOStat	Display SWO status
SWORead	SWORead	Read and display SWO data
SWOShow	SWOShow	Read and analyze SWO data
SWOFlush	SWOFlush	Flush SWO data
SWOView	SWOView	View SWO terminal data
Flash programming
Erase	Erase	Erase flash (range) of selected device
LoadFile	LoadFile	Load data file into target memory
SaveBin	SaveBin	Save target memory range into binary file
VerifyBin	VerifyBin	Verfy if specified bin file is at the specified target memory location
Flasher File I/O Commands
FWrite	FWr	(Flasher only) Write file to probe
FRead	FRd	(Flasher only) Read file from probe
FShow	FShow	(Flasher only) Read and display file from probe
FDelete	FDel	(Flasher only) Delete file on probe
FSize	FSz	(Flasher only) Display size of file on probe
FList	FList	(Flasher only) List directory on probe
SecureArea	SecureArea	(Flasher only) Creates/Removes secure area on probe
Measurement and test commands
PowerTrace	PowerTrace	Perform power trace (not supported by all models)
TestWSpeed	TestW	Measure download speed into target memory
TestRSpeed	TestR	Measure upload speed from target memory
TestCSpeed	TestC	Measure CPU speed
TestNWSpeed	TestNW	Measure network download speed
TestNRSpeed	TestNR	Measure network upload speed
MR	MR	Measure RTCK react time
J-Link Pin control
Clock	C	Output clock(s) on the TCK pin
Clock00	C00	Output clock(s) on the TCK pin, with TDI == 0 and TMS == 0
ClrTCK	TCK0	Clear TCK pin
SetTCK	TCK1	Set TCK pin
ClrTDI	TDI0	Clear TDI pin
SetTDI	TDI1	Set TDI pin
ClrTMS	TMS0	Clear TMS pin
SetTMS	TMS1	Set TMS pin
ClrTRST	TRST0	Clear TRST pin
SetTRST	TRST1	Set TRST pin
ClrRESET	R0	Clear RESET pin
SetRESET	R1	Set RESET pin

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