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TRF7970A: Using an SPI to USB converter to program the board.

August Arnal
Prodigy 30 points
Part Number: TRF7970A
Other Parts Discussed in Thread: DLP-7970ABP, , MSP430F5529, DLP-RFID1, MSP430F2370

Hi I acquired one DLP-7970ABP and an SPI to USB converter, UMFT221XA. I am trying to contact with the computer with the serial devices with no luck. I had used Docklight and python serial communication in order to try to obtain some response. I am following the instruction set provided in SLOU321A with no response from the reader. Can you provide any instructions to go ahead.

PD. I thougt it was a problem of the UMFT221XA device so I tried with UMFT220XA, with the same bad results.

Thanks in advance,

August

  • 0
    TI__Guru*** 128195 points
    Hello August,

    If you have the DLP-7970ABP, then the instruction set from SLOU321A won't work.

    The DLP-7970ABP is a BoosterPack for our TRF7970A NFC Transceiver. It only has the transceiver with no MCU to control it.

    The instruction set from SLOU321A is supposed to be sent to an MCU that is running firmware from the TRF7970AEVM, and the MCU then sends SPI commands to the TRF7970A after decoding the commands.

    This isn't the normal use for our BoosterPack... I would like to understand what you are trying to achieve with this setup.

    I wouldn't recommend using a PC to directly control the TRF7970A over USB with a USB to SPI translator. You really should have an MCU between to handle receiving USB commands and issuing SPI commands. That is the intended use for the TRF7970A, and I've never heard of anyone ever trying to do something like what you are with sending Docklight commands into SPI converter straight to the TRF7970A.

    An MSP430F5529 LaunchPad might be your best fit as that already as USB communication and our demo GUI uses that. See this User's Guide: www.ti.com/lit/ug/slou452/slou452.pdf
  • 0 in reply to Ralph Jacobi
    Prodigy 30 points
    Hello Ralph,

    Thanks for your reply, I was trying to make the reader with the less systems possibles, but as you explain it is not recommendable so I will try with the MSP430F5529 LaunchPad.

    By the way do you know if the DLP-RFID1 includes the MSP430F5529? I am asking to know the instruction set to be used.

    Thanks in advance,

    August
  • 0 in reply to August Arnal
    TI__Guru*** 128195 points
    Hello August,

    I don't know about that product, TI doesn't make it. I do know that the DLP-RFID2 standalone module (not what is used on the DLP-7970ABP BoosterPack) I know uses an MSP430F2370 and has an instruction set similar to the one described in slou321a, but I have no idea if thats the case for the DLP-RFID1 at all.
  • 0 in reply to Ralph Jacobi
    Prodigy 30 points
    Dear Ralph,

    I am back with the project. I have acquired the MSP-EXP43F5529LP, I had been able to use it with the DLP-7970ABP. So now I want to make my own application in python and I would like to know where to find the SPI commands that the MCU is sending to the DLP.

    Best Regards,

    August
  • 0 in reply to August Arnal
    TI__Guru*** 128195 points
    Hello August,

    I'm not sure I understand your intent of knowing what the SPI commands between the MSP430 and TRF7970A are.

    If you want to run an application in Python, you are going to need to talk to the MSP430 and issue commands to it based on the NFC application layer. You shouldn't need to touch the SPI communication at all.