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TMS320F280045: FSI - one direction communication

Jan Juranek
Intellectual 310 points
Part Number: TMS320F280045

Hello,

is it possible to create one direction communication using FSI?

My idea is to have sensor (FSI master) which has FSITX and FSICLK signals and sends data to  another FSI Device (slave) which has FSIRX and FSICLK input pins.

In TMS320F28004x reference manual I found only the SPI compability mode which doesn't suit my application (I cannot waste mcu time by encoding FSI frame to SPI frame) and note 28.5.1.2 Establishing the Communication link from which I understand that when I want to establish communication between two FSI modules I need both RX and TX signals on both master and slave devices.

Thank you,

Jan

  • 0
    TI__Mastermind 38275 points

    Jan,

    Yes, you can have unidirectional FSI like you're wanting. The FSI TX and RX modules are independent of each other and can be used individually. If you want some form of feedback from your slave device you can use an ordinary GPIO instead of FSI TX if you'd like.

    Jan Juranek said:
    In TMS320F28004x reference manual I found only the SPI compability mode which doesn't suit my application (I cannot waste mcu time by encoding FSI frame to SPI frame) and note 28.5.1.2 Establishing the Communication link from which I understand that when I want to establish communication between two FSI modules I need both RX and TX signals on both master and slave devices.

    The details in that section describe how you can validate the FSI link is good, but isn't necessarily a requirement for FSI to work. As I mentioned you can use an ordinary GPIO for feedback if desired, i.e. GPIO toggles to notify master that the frame was received and that the link is good.

    Best,

    Kevin