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TM4C1294NCPDT: Host interface/SPI/UART, FLASH Interface/FLASH_SPI, SPI/SSI, SSIXDATX

AFZAL IMAM SAJID
Prodigy 140 points
Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: MSP432E401Y

Hi Everyone,

A very Happy New Year in Advance.

I have a confusion with 4 wire SPI protocol in TM4C1294NCPDT/MSP432E401Y . Please help me to understand difference between  SPI and SSI and how to implement these 2 protocol?

To implement 4 wire SPI (SSI1) bus protocol, can following pin connection be used?

SSI1FSS (Pin No 121) as Chip select Signal.

SSI1CLK (Pin No 120) as Clock singal.

SSIDAT2 (Pin No 125) as MOSI or MISO.

SSI1DAT3 (Pin No 126) as MISO or MOSI.

Or I have to use SSIDAT0 (Pin NO 123) as MOSI or MISO.

and SSI1DAT1 (Pin No 124) as MISO or MOSI.

With Regards 

Afzal Imam Sajid

  • 0
    TI__Guru 72500 points

    For a simple 4 wire SPI protocol, if the TM4C device is the master, SSInFSS is the chip select, SSInCLK is the clock, SSInDAT0 is MOSI and SSInDAT1 is MISO. When used as a slave SSInDAT0 is MISO and SSInDAT1 is MOSI. In the SSI, unlike some SPI implementations, the SSInDAT0 pin is always the TX and the SSInDAT1 pin is always the RX. SSInDAT2 and SSInDAT3 are only used in quad (by 4) mode.

  • 0 in reply to Bob Crosby
    Prodigy 140 points

    Hi Bob, 

    Thank you very much for your quick reply.