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LAUNCHXL-CC26X2R1: CC26X2 - SPI transmission in backdoor bootloader

Kousalya Saminathan
Prodigy 50 points
Part Number: LAUNCHXL-CC26X2R1

Tool/software:

In Backdoor bootloader mode we are using SPI protocol

While sending 1byte per transfer in synchronous mode we are getting acknowledgement(0xCC) as well as data(ex: CRC, Status)

But while sending entire bytes in asynchronous mode we are getting only acknowledgement but not getting CRC or Status

For reference attached images

  • +1
    TI__Guru**** 209557 points

    Hi Kousalya,

    Please enable the Logic software's Analyzer feature so that they MISO/MOSI lines can be translated for easier interpretation.  It is also important that your controller device is using SPH of 1 (data captured on the second clock edge transition) as this is the established communication mode for the SPI ROM Bootloader as described in Section 10.2.2.2 of the TRM and further covered in SWRA466. For multi-byte packets, please also describe the packet format including the size, checksum, and data bytes.

    Regards,
    Ryan