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MSP430FR4133: LaunchPad SPP to PC going through ezFET, or directly?

Robert Clark59
Intellectual 930 points
Part Number: MSP430FR4133

Hi Forum,

Getting started with the MSP430 series but need to plan ahead for proper pins (interface) on the circuit board.

Are the SPP Tx and Rx going through the ezFET, or directly to the PC? I understand that the JTAG connections are used to program the MSP430, thus those connections must be available for a programmer, but are the SPP Tx and Rx also involved? Is it possible to communicate directly with the target with SPP Tx and SPP Rx?

I suppose if I want to look at any production target the pins should be there anyway, and should also power the production target. Therefore six pins, 0v,+5v,SBWTDIO,SBWTCK,SPP TX,SPP RX.

Please let me know if I have this correctly.

Thank you,

Robert.

  • 0
    Guru 33653 points

    FET is connected to PC by USB interface, and there is no direct connection between target device and PC. USB interface is composite, one is used for SBW and another as CDC / UART bridge, both handled by FET master device. Using CDC / UART bridge is optional, not used for SBW interface.

  • 0 in reply to zrno soli
    Intellectual 930 points

    Ok, therefore, SPW has two pins that are required, as well as the SPP Rx,Tx  to USB interface. And that makes the "composite" interface. Four pins total for the interface.

    Are the LaunchPad interface boards sold separately (haven't found any),  or do I just cut off the target end (when done with it) and use the interface end to communicate with?

    Thank you all for helping with this, it does save a lot of time.

    Robert.

  • 0 in reply to Robert Clark59
    Guru 33653 points

    Robert Clark59 said:
    Ok, therefore, SPW has two pins that are required, as well as the SPP Rx,Tx  to USB interface. And that makes the "composite" interface. Four pins total for the interface.

    Composite interface is used to have independent SBW / UART connection / data transfer from PC side. FET will be enumerated as two separate ports.

    Robert Clark59 said:
    Are the LaunchPad interface boards sold separately (haven't found any),  or do I just cut off the target end (when done with it) and use the interface end to communicate with?

    If you don't need SBW anymore, but your device is communicate by UART with PC, than any USB / UART dedicated bridge chip can be used (you can find this small bards for few $ on ebay, something like this).

    Of course you can also use LP for this.

    eZ-FET Lite is open software / hardware, so if you have some special reason for this, you can build it by yourself.

    http://forum.43oh.com/topic/5530-custom-ezfet-lite/

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