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。
目录
驱动安装
打开Jlinkcmd
建立连接
常用指令
实测举例
指令大全
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文章来源：https://www.toymoban.com/news/detail-414457.html |
Set RESET pin文章来源地址https://www.toymoban.com/news/detail-414457.html |
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