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TRF7960: Integration with STM32F407 Processor via SPI

Piyush Ramuka
Prodigy 95 points
Part Number: TRF7960

Hello - 

We are trying to integration TRF7960 with our custom hardware which has STM32F407 processor (via SPI). As per errata 1.1 on TRF7960, we need to switch the polarity of clock during write &read operation. http://www.ti.com/lit/an/sloa140a/sloa140a.pdf

We are trying to determine the best way to change polarity without re-initialization of SPI between read & write cycles? I understand that this is not ST forum but am sure someone may have addressed it.

Thank you in advance. Looking forward for any help. 

Regards,

Piyush

 

  • 0
    TI__Guru*** 128125 points
    Hi Piyush,

    Unfortunately, we don't have really have active community members on the forums or anyone who uses ST parts, so it'd be a long shot to get any help on here for that.

    For MSP430's, the polarity switch is done without a full peripheral reconfiguration. All that is needed is to put the peripheral into reset, change the setting, and bring it back out of reset again. Perhaps a similar method is possible, but otherwise you would need to check with ST how to make a simple change like that.
  • 0 in reply to Ralph Jacobi
    Prodigy 95 points
    Hi -

    Thanks for your response. I was able to get some help from ST. The time to reinitialize was very small (1uSecond) so we could manage to change the polarity between read and writes.

    I am having another issue now while getting inventory. Will create a new post for same. Thanks!