STM32 Learning 004_Debugging Tool J_LINK

Jlink is a product of Segger. Jlink officially provides debugging software and drivers. The debugging software includes jlink command (j-tag debugging), j-mem (memory viewing), j-flash (flash burning), etc. I mainly use jlink commander. The following is its command set:

  SEGGER J-Link Commander V4.20h ('?' for help)

Compiled on October 5, 2010 at 19:11:57

DLL version V4.20h, compiled on 2010-10-05 19:11:41

Firmware: J-Link ARM V8 compiled on May 5, 2010 08:59:59

Hardware: V8.00

S/N:20100214

Features: RDI, FlashDL, FlashBP, JFlash, GDBFull

VTarget = 3.280V

Message: TotalIRLen=? , IRPrint = 0x..FFFFFFFFFFFFFFFFFFFF1

WARNING: No CPU cores found.

No device was found on the JTAG chain. Trying to find a device on SWD.

WARNING: No CPU cores found.

****** Error: Parity error (Data = 0xFFFFFFFF, ReceivedParity = 1)

There are no devices in SWD.

No cores found

Info: TotalIRLen = 9, IRPrint = 0x0011

Found 2 JTAG devices, total IRLen = 5:

 #0 Id: 0x2B900F0F, IRLen: 04, IRPrint: 0x0, ARM ETB

 #1 Id: 0x07B76F0F, IRLen: 05, IRPrint: 0x1, ARM1176 Core

ARM11 is confirmed.

J-Link>

  The available commands are:

----------------------

fFirmware Information

hStop

g go

Sleep waits for a given time in milliseconds. Syntax: sleep

s Single-step target chip

st shows the hardware status

hwinfo displays hardware information

mem reads memory Syntax: mem, (hexadecimal)

mem8 reads 8-bit items. Syntax: mem8, (hexadecimal)

mem16 reads 16-bit items. Syntax: mem16, (hexadecimal)

mem32 reads 32-bit items. Syntax: mem32, (hexadecimal)

w1 writes an 8-bit item. Syntax: w1, (hexadecimal)

w2 writes 16-bit items. Syntax: w2, (hexadecimal)

w4 writes a 32-bit item. Syntax: w4, (hexadecimal)

wm write test word. Syntax: wm

It is the length of the scan chain selection register.

ms measures the length of the scan chain. Syntax: ms

mr measures the RTCK reaction time. Syntax: mr

qExit

qc closes the JLink connection and exits

rReset target (RESET)

rx reset target (RESET). Syntax: rx

RSetType sets the current reset type. Syntax: RSetType

Register Displays the contents of the register

wreg writes to a register. Syntax: wreg,

SetBP sets a breakpoint. Syntax: SetBP [A/T] [S/H]

SetWP Set Watchpoint. Syntax: [R / W] [ [] [A-Mask]]

ClrBP clears the breakpoint. Syntax: ClrBP  

ClrWP clears the watchpoint. Syntax: ClrWP  

VCatch write vector capture. Syntax: VCatch

loadbin loads a binary file into target memory.

             Syntax: loadbin ,

savebin saves the target memory as a binary file.

             Syntax: savebin , ,

SetPC sets PC to the specified value. Syntax: SetPC

le changed to little endian mode

Change to big endian mode

Log enables logging to a file. Syntax: log

unlock unlocks the device. Syntax: unlock

           Type unlock no to get a list

           The supported device names.

           nRESET must be connected

---- CP15 ------------

rce reads CP15. Syntax: rce, , ,

wce writes CP15. Syntax: wce, , , ,

- - ice- - - - - - -

Embedded ICE macrocell (ICE breaker) showing ICE status

ri Read Ice reg. Syntax: ri (hexadecimal)

wi writes ice reg. Syntax: wi, (hexadecimal)

---- ETM -------------

etm shows ETM status

re read ETM reg. Syntax: re

We write ETM reg. Syntax: We, (hexadecimal)

es start tracking

----ETB-------------

etb shows ETB status

rb reads the ETB register. Syntax: rb

wb writes to the ETB register. Syntax: wb, (hexadecimal)

---- TRACE -----------

TAddBranch TRACE - Adds a branch instruction to the trace buffer. Paras:,

TAddInst TRACE - Adds a (non-branch) instruction to the trace buffer. Syntax:

TClear TRACE - Clear the buffer

TSetSize TRACE - Sets the size of the trace buffer

TSetFormat TRACE - SetFormat

TSR TRACE - Display regions (and analyze trace buffer)

TStart TRACE - Start

TStop TRACE - Stop

---- SWO -------------

SWOSpeed ​​SWO - Displays supported speeds

SWOStart SWO - Start

SWOStop SWO - Discontinued

SWOStat SWO - Displays SWO status

SWORead SWO - Read and display SWO data

SWOShow SWO - Read and analyze SWO data

SWOFlush SWO - refresh data

----File I/O--------

fwrite writes the file to the emulator

fread reads a file from the simulator

fshow reads and displays a file from the simulator

fdelete deletes files on the simulator

fsize displays the size of the file on the simulator

----test------------

thg run/stop 1000 times

ts runs the step 1000 times

testwspeed tests the download speed. Syntax: testwspeed [ []]

testrspeed tests the upload speed. Syntax: testrspeed [ [ ] [

S>]]

testcspeed tests the CPU speed. Syntax: testcspeed []

---- JTAG ------------

Configuration sets the number of IR/DR bits before ARM devices.

             Syntax: configure ,

Speed ​​sets the JTAG speed. Syntax: speed| auto| adaptive, for example, speed 2000,

Speed

I read the JTAG ID (Host CPU)

wjc Write JTAG command (IR). Syntax: wjc (hexadecimal)

wjd writes JTAG data (DR). Syntax: wjd (hexadecimal), (decomposition)

RTAP resets the TAP controller using the state machine (111110)

wjraw writes raw JTAG data. Syntax: wjraw, ,

rt resets the TAP controller (nTRST)

---- JTAG Hardware ---

c00 creates clock with TDI = TMS = 0

c clock

0 Clear TDI

1 Setting up TDI

t0 Clear TMS

t1Set TMS

trst0 clear TRST

trst1 sets TRST

r0 clear reset

r1 sets RESET

----connect------

usb connects to the J-Link via USB. Syntax: usb where port is 0..3

ip connects to the J-Link ARM Pro or J-Link TCP/IP Server via TCP/IP.

           Syntax: ip

----Configuration---

si selects the target interface. Syntax: si,

           Where 0 = JTAG, 1 = SWD.

Power switches the power to the target. Syntax: power [perm]

           State is either on or off. Example: Power on

wconf write configuration bytes. Syntax: wconf,

rconf reads the configuration bytes. Syntax: rconf

usbaddr assigns the usb address to the connected J-Link: Syntax: usbaddr =

ipaddr displays/assigns the IP address and subnet mask of the connected J-Link.

gwaddr displays/assigns the connected J-Link network gateway address.

dnsaddr displays/assigns the network DNS server address of the connected J-Link.

conf shows the configuration of the connected J-Link.

ecp enables the J-Link control panel.

Calibrate calibrates the target current measurement.

----------------------

Note: Specify the file name on the command line

Will start J-Link Commander in script mode.

  To summarize the commands we use most:

  USB -------- Connect to target board

  [R----------Restart the target board

  Stop-------Stop the program running on the CPU

  loadbin ---- load an executable binary file

  g ----------jump to the code segment address to execute
  s ----------single-step execution (for debugging)
  setpc -----set the value of the pc register (for debugging)
  setbp -----set a breakpoint

  -------Scratchpad read register organization

  WREG -------Write register

  MEM --------Read memory

  W4 ---------Write Memory

  Turn off mmu --- Turn off mmu, which is very important for bare board debugging
  w4 cpsr, 0x0000001f ------ Switch to system mode

  Speed------Set the transmission rate of jtag
  rce 0, c0, c0, 0 -----Set the first register of cp15 register to 0