• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 659 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TM4C123H6PMI SPI 3 WIRE

Iliescu Mihai60
Prodigy 10 points


Hello,

I got a LCD with just 3 wire for communication, SDA, SCLK and CSX, and i am not sure how should i connect it to TM4C123 uC. I don't see in the TM4C123 datasheet a way of using just 3-wire SPI, can you help me? Thank you!


Best regards, 
Iliescu Mihai

  • 0
    Guru 47900 points

    Usually - but not always - such "3-wire SPI" links avoid the use of "Return data" from the remote, SPI Slave.   (i.e. the display is a one-way (send & pray) type device)

    Not too hard to extend this to:

    SDA: MCU's SPI_TX ties here

    SCK: MCU's SPI_CLK here

    CSX: MCU's SPI_FSS here ***  (you must compare the display's data-sheet w/MCU's (various) SPI formats - and "mate the two."   Lcd is the "boss" in this instance (i.e. the MCU must bend to the will of the display (as the display cannot change))   *** should there be "no" successful mating between Lcd's signal chart & your MCU - you must (instead) employ a GPIO pin to serve as "CSX."   This is more work for you - but insures that you can make most any SPI device properly attach to your MCU.