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TMS320F280049C: FSI use as SPI restriction

Emma Wang
Expert 4760 points
Part Number: TMS320F280049C

hi expert,

I want to use FSI at SPI mode, but from TRM. there is some restriction on SPI mode.

for example, it can only support 16 bit length. and only support one mode:

Data will transmit on rising edge and receive on falling edge of the clock.

So does this means, when FSI uses as SPI, the other side should do some special process，it must be another MCU or processor? is this possible to connect to an ADC such as ADS129X.

BR

Emma

  • 0
    TI__Mastermind 40685 points

    Hi Emma,

    While the FSI SPI compatibility mode is able to match the physical interface of a regular SPI, it is not equivalent to a regular SPI module and has some specific limitations.

    • FSI-SPI can only transmit and receive the frame format below, therefore it can only interface with SPI devices that can receive/transmit this frame structure. The Data words section consists of 1 to 16 configurable 16-bit words.

    • This being the case, I don't see how you could interface with a ADS129X device, since you cannot change the format of SPI data it expects to receive or sends.

    Best,

    Kevin