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TMS320F280039C-Q1: C2000 microcontrollers forum

James Long
Prodigy 140 points
Part Number: TMS320F280039C-Q1
Other Parts Discussed in Thread: TMDSHSECDOCK

on the launchxl-f28003x dev board, I am wondering if i can disconnect the four JTAG jumpers from the on-board XDS110 and instead wire up an XDS200 to the jtag header and use that to debug my board? is that possible if i use just the TMI, TCK, TDO, and TMS pins or is something else in my way? I tried to do this, but it failed. I'm wondering it it is even possible or i am just wasting time trying to get something to work that is impossible  

  • 0
    TI__Mastermind 29111 points

    It should be doable. What connections have you made between the XDS200 debug probe and the LaunchPad? What errors are you seeing?

  • 0 in reply to Gus Martinez
    Prodigy 140 points

    good morning Gus,

    I'm rx-ing a -183 error (cable break far). i removed the 4 JTAG flywire jumpers (TCK, TMS, TDO, and TDI) between the XDS110 and the MCU, and then wired those JTAG headers on the MCU side to the XDS200. Using the XDS target connection guide and JTAG connectors and pinout page, it looks like the XDS200 JTAG header is of type 'Compact TI 20-Pin' (since TI 20-pin is obsolete) which correlates to wiring TCK to pin 11, TMS to pin 1, TDO to pin 7, and TDI to pin 3. 

    Do those pinouts sound right to you? 

    while my t/s-ing efforts are nascent at this time, I am wondering:

    1. does the connection between the XDS200 probe and the MCU have to be less than 6" ?

    2. Do we use 'cJTAG 2 pin advanced modes' for the connection mode? 

    3. Do I need to remove the UART jumpers (TXD/RXD) as well? I did just in case.'

    thank you,

    james

  • 0 in reply to James Long
    TI__Mastermind 29111 points

    I think you may need RTCK (pin 9 to pin 11), VTREF (pin5 pulled to 3.3V), and TDIS (pin 4 to GND) as well. See sample of how we connect a 20-pin header (J3) on our docking station (TMDSHSECDOCK). I am sure you are also connected GNDs between the LauchPad and XDS200?

    James Long said:
    1. does the connection between the XDS200 probe and the MCU have to be less than 6" ?

    Maybe, if the signal integrity is bad. But you can always slow down the speed through CCS to see if it helps.

    James Long said:
    2. Do we use 'cJTAG 2 pin advanced modes' for the connection mode? 

    Yes, this is needed. The TDI and TDO pins are not connected to the MCU by default on the LaunchPad.

    James Long said:
    3. Do I need to remove the UART jumpers (TXD/RXD) as well? I did just in case.'

    It shouldn't matter, but safer to do so.