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AWR1642: Flashing Standalone AWR1642

Denis Nakazawa
Prodigy 100 points
Part Number: AWR1642
Other Parts Discussed in Thread: UNIFLASH,

Hello, 

I'm currently working on a project that includes the AWR1642. My problem is that when I use Uniflash to try and flash the chip, it reports an error that the tool 1) doesn't receive a response from the AWR and 2) cannot open the COM port to flash the chip. I'm using an Adafruit USB-to-UART bridge to connect to the N4 and N5 pins (UART) of the AWR with the SOP headers jumped in a 101 configuration (flashing mode). I've proven that I can flash the AWR with these tools using the AWR1642BOOST-ODS evaluation board and now I am trying to transfer this to a standalone application. I should also note that I also use the same regulator on the EVM on my standalone PCB. 

Things I've tried so far:

  • Checked that the leads from the USB-to-UART bridge are connected to the proper pins on the AWR
  • Checked that the SOP headers are in the flashing configuration (101 configuration)
  • Checked that the regulator outputs the necessary voltages for powering the AWR
  • Checked for discrepancies between EVM and PCB schematics

Would anybody be able to shed some light on what may be going on or other things I can try to troubleshoot?

Thank you in advance!

  • 0
    TI__Guru*** 148574 points

    Hi,

    Unfortunately the team member that supports these questions is not available this week.

    We will get back to you next week

    thank you

    Cesar

  • 0
    TI__Mastermind 30125 points

    Hello,

    Are you able to confirm that all power supplies and SOP signals are stable before NRST is released? If NRST is coming up before SOP and power signals are stable, maybe the SOP mode is not getting correctly latched. You can also try manually triggering NRST after device is powered up and stable to make sure SOP mode is getting correctly latched. 

    Also, if you probe the XTAL and VBGAP pins, do you see the 40MHz signal and the VBGAP voltage around 0.9V? This will confirm that the radar is waking up properly.

    Regards,

    Adrian 

  • 0 in reply to aozer
    Prodigy 100 points

    Hi Adrian, 

    Thank you for your response!

    While awaiting your response I was able to create a board that we successfully flashed. However, I am still unsure what was different with the other boards and it may simply come down to my soldering and reflowing process (I'm populating these boards myself).

    Thank you for your suggestions regarding the SOP and NRST signals. Currently, I just have the NRST pulled up through a resistor, so there may be some minute timing issues there that I can improve on.

    I do typically see the 40 MHz signal on the XTAL pin, but I have yet to check the VBGAP pin for that voltage. 

    Thank you again for your suggestions!

    Sincerely,

    Denis