How to Use JTAG with ARM7 MCU

ARM MICROCONTROLLER TRAINING

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How

to Use

JTAG with ARM7

NxP LPC2xxx MCU

(Wiggler Clone with H-JTAG and IAR Workbench)

Step by Step Tutorial


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Introduction:

Joint Test Action Group (JTAG) is the common name for what was later standardized as the

IEEE 1149.1 Standard Test Access Port and Boundary-Scan Architecture. It was initially

devised for testing printed circuit boards using boundary scan and is still widely used for this

application.

Today JTAG is also widely used for IC debug ports. In the embedded processor market,

essentially all modern processors support JTAG when they have enough pins. Embedded

systems development relies on debuggers talking to chips with JTAG to perform operations like

single stepping and breakpointing. Digital electronics products such as cell phones or a wireless

access point generally have no other debug or test interfaces

For More: Wikipedia

Download H-JTAG Software from http://www.hjtag.com/


For Latest Embedded


STEP 1: After Installation Open H


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Embedded Information


After Installation Open H-JTAG Server from Icon after Installtaion.

Icon after Installtaion.


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STEP 2: Open Setting Go to USB/LPT Selection


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STEP 3: Select LPT/Parallel Port for Wigger Clone.


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STEP 4: Go to Setting and Select LPT JTAG Setting.


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Step 5: Go To Wiggler(Predefined) Select following options

1) Wiggler (Predefined) from Jtag Selection

2) MAX/1 from TCK Control

3) Select pin6 D4 from Wiggle Pin Assignment

4) Select NO SYS RST from Wiggle Pin Assignment


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STEP 6: Switch “ON” LPC2148 Board having JTAG Connector and You may

recevice following Message “Detecting Target”.


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STEP 7 : Goto H-Flasher Select > Configuration > Frequency of crystal


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STEP 8 : Goto H-Flasher Select > Flash Selection > Target device Select Microcotroller LPC2148


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STEP 9: Then you may see ARM7TDMI-S Core is Detected in which LPC2148 is based

upon.


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Note: Here you must have written some simple code of LED Toggle with IAR Workbench.

STEP 10: Goto > Option for Settings for debugging


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STEP 11: Go to options > Debugger > Select RDI


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STEP 12: Goto > RDI > Browse the path > C:\Program Files\H-JTAG\DLLS\H-JTAG.dll


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STEP 13 : Go to > Linker > Config > Select Override default > Brows path

$PROJ_DIR$\LPC2148_RAM.icf


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STEP 14: Go to > Project > Download and Debug By selecting this process of Debugging will be start


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STEP 15: After all settings you will see the Tool Bar of Debugging and veiw the status of pins and registers


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STEP 16: Now you can view Green color


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STEP 17: Process of debugging step by step


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How to Use JTAG with ARM7 MCU

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