JTAG PIN Identification

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My Setup


  • Parrot Linux
  • Arduino UNO
  • Broadlink RM Mini 

Software



JTAG PINS to be Identified


  • TCK   - Test Clock
  • TMS  - Test Mode 
  • TDI   - Test Data IN
  • TDO  - Test Data Out
  • GND  - Ground


Hardware Connection Set up


  • Connect Laptop and Arduino (USB cable)
  • Arduino Digital PIN (any 5 pins) to RM Mini (5 pins) [Except 1 - VCC and 1 - GND]

Note: If you are using JTAGENUM, the JTAGenum sketch uses the DIGITAL PIN from 2 to 11. Refer the line number 72(ino file)

Software Connection Set up

  • Download the INO sketch from the github
  • Open the Arduino IDE and Load the downloaded JTAGEnum sketch
  • Choose the correct Serial Port and Board
  • Compile and Upload the sketch
  • Open the Serial Monitor
  • Set the correct baud rate
  • Enter the command to scan ("s")

Arduino PIN Layout


  • Digital PIN 2(Black)
  • Digital PIN 3(White)
  • Digital PIN 4(Grey)
  • Digital PIN 5(Maroon)
  • Digital PIN 6(Blue)
  • GND - GREEN

Screenshots

JTAG PIN Layout (FRONT)












JTAG PIN Layout (BACK)













VCC and GND PIN Identified: (Will be Explained in another post)












Device PIN Connection (Broadlink Mini) - VCC should not be connected












Arduino PIN Connection(Digital 2 to 6)









Arduino Total Connection: (GND and All Digital PIN)












Arduino and Broadlink Mini








Arduino - Select Board (UNO)
Arduino - Select Serial Port
Arduino - Upload Sketch





Arduino - Serial Monitor (To View Output)
Arduino - Change Baud Rate (Set 115200)












Arduino - Output (PIN Identified)







JTAGEnum Output:

FOUND! ntrst:IDG_2 tck:DIG_5 tms:DIG_4 tdo:DIG_6 tdi:DIG_3 IR length: 4

TCK - Digital PIN 5
TMS - Digital PIN 4
TDO - Digital PIN 6
TDI - Digital PIN 3 

ntrst - Not Interested :P

Comments

  1. Anonymous16 October 2023 at 05:31

    Hello, please add info that standard voltage for jtag is 3.3v ;) Arduino uno has 5v i/o. Devices can be burned if their jtag supports only 3.3v(i burned my ruter :) - not your fault of course). Better to use some other arduino with default i/o 3.3vor use some converters etc.

    ReplyDelete

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