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Problem: Debug MSP430FR5969 with MSP-FET (Unknown device)

Simon Heller
Prodigy 120 points
Other Parts Discussed in Thread: MSP-FET, MSP430FR5969, MSP-EXP430FR5969

Hi everyone,

for my actual project I have to debug a MSP430FR5969 at a supply voltage of 2V. Therefore I bought an MSP-FET. Now the problem is that I can’t upload/debug the code. Most of the time I get the error “Unknown device”, even if I connect the MSP-FET to my MSP430FR5969 Launchpad. I’ve already read many post here which seems to deal with the same problem but I didn’t really find an answer. Do I have to change any settings in the CCS6 for example for 2 wire JTAG? Is there a problem with the security fuse?

Thanks in advance!

Simon

  • 0
    TI__Guru* 79301 points

    Hi Simon,

    The MSP-FET should allow you to follow the external voltage that you are using to supply your board. Can you elaborate a little more on exactly how you have everything hooked up?

    If you use an MSP-EXP430FR5969 Launchpad in this way with MSP-FET:

    1. make sure that you do not have the Launchpad USB connected to the PC - you should have no USB connected, connect only the MSP-FET on J3
    2. Set J10 "Power Select" Jumper to the position marked "External". If it is set to "Debugger" (which is the default position the jumper is in when the board ships I believe) then your debugging will not work with an external voltage
      1. The reason you are doing this, is that the MSP-FET has 2 different Vcc pins - one of them (JTAG pin 2) is an output for supplying power to the MSP430 from the debugger. The other one (JTAG pin 4) is an input for when you are externally powering the part to allow the MSP-FET to follow this external voltage on all of its programming signals. Moving the jumper to "External" makes it so that Vcc is connected to this JTAG pin 4 for externally powered debugging. See the Launchpad  user's guide for details: www.ti.com/lit/pdf/slau535 and the hardware tools user's guide chapter 2 www.ti.com/lit/pdf/slau278

    3. Apply your 2V to the Vcc pin on J1 and connect J1 GND to GND of the supply
    4. Ideally you might want to remove the J13 jumpers as well, as you are not using the eZ-FET debugging section at all - might as well not even connect it or power it.

    Regards,

    Katie

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