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MSP430: Error connecting to the target: Unknown device

dmh43
Intellectual 420 points

im using the new launchpad (exp430f5529LP) to program a g2553 in circuit. ive connected the rst and tst lines as well as Vcc and gnd and a 47k resistor from rst to vcc
I keep getting "MSP430: Error connecting to the target: Unknown device" error when programming
i used to use this setup with the old launchpad with no problems but i cant seem to get this new launchpad to work right

and i get the error regardless of which device i use so it must be something with the launchpad or my setup

any idea what could be the problem?

  • 0
    Guru 74080 points

    I start from the premise that this launchpad has the capability to program those value-line-MCUs (which I actually don't know).

    Is the 2n2-filter-cap assembled from RST to GND, too? Your wiring should be as short as possible. And maybe a silly question, but where did you connect the SBW-wires? On the EXP430G2 you can remove the micro, but on the EXP430F5529LP you cannot. So did you make the connection from one of the two header-connectors on the side of the board or did you make it from the header that holds the jumpers?

    Of course you have to establish the connection from the green-circled ones without the jumpers connected.

    Dennis

  • 0 in reply to Dennis Eichmann
    Intellectual 420 points

    The datasheet for the launchpad specifies that it can program devices other than the one on the board. Also, yes I have disconnected all the jumpers and am connecting my g2553 to the pins on the emulator side of the board. I have not connected the 2.2nF cap but have never had to in the past. I will give it a shot later today.

  • 0 in reply to dmh43
    Guru 227245 points
    For the programming process, the 2.2nF are not necessary. The FET is pulling RST lien up and down. The cap is required for proper startup when RST is NOT connected to a FET (it provides a delay between rising VCC and rising of RST), and of course suppresses spikes by crosstalk to the RST line.
    The F5529 LP AFAIK no longer uses the F1612 for the FET part. Instead, a 5529 or so is used. Due to this, the JTAG baudrates are higher than with the older F1612-based FETs (like the G2 LaunchPad) and the SBW protocol is even more timing sensitive than before (and therefore wire length and capacitance is more limited than before).

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