Useable SPI interface on C6748 LCDK?

I only want to use the 3-pin configuration, i.e. MISO, MOSI and SCLK.

The platform code for SPI - SPIPinMuxSetup also sets PINMUX3_SPI0_ENA_ENABLE.

Can I leave it like this? The ENA pin does not seem to be connected anyway. Or should I replace the code?

You can leave it, don't want to change the code.

/* value to configure SMIO,SOMI,CLK and CS pin as functional pin */

#define SIMO_SOMI_CLK_CS        0x00000E04

What about the Chip Select signal. If I read the manual correctly I'd say one has to manage the CS signals for the slaves self, i.e. with GPIO signals as the provided CS signals for the C6748 being operated in slave mode. Is SPI1CSPinMuxSetup therefore only applicable in slave mode? I mean I don't really want to select a *Slave* Chip Select(CS) pin then, right?

Nope, master is also need CS pin for SPI transfers.

Master will assert the CS to select the slave device.

C:\ti\OMAPL138_StarterWare_1_10_04_01\examples\lcdkOMAPL138\spi\spi.c

static void ResetCommand(void)

{

// Issue Reset Command

tx_data[0] = 0x80;

tx_data[1] = 0x14;

tx_data[2] = 0xBA;

tx_data[3] = 0x07;

tx_data[4] = 0x00;

tx_data[5] = 0x00;

tx_data[6] = 0x00;

tx_len = 7;

rx_len = 7;

SPIDat1Config(SOC_SPI_1_REGS, (SPI_CSHOLD | SPI_DATA_FORMAT0), 0x4);

   SpiTransfer();

}

Thank you for the clarification, Titus.

That CS is required, is clear. I just was not sure if the control over CS was done by the SPI controller itself.

For futher clarification:

    /*
    ** Using the Chip Select(CS) 0 pin of SPI1 to communicate with the Fingerprint Sensor.
    */
    SPI1CSPinMuxSetup(2);

Is "Chip Select(CS) 0 pin" a typo and "pin 2" meant, i.e. is *slave* chip select pin SPI1_SCSn_2 used then?

Edit: initial confusion came from SPRS590F, section 6.17:

"The optional SPIx_SCS (Slave Chip Select) pin is most useful to enable in slave mode when there are other slave devices on the same SPI port. The device will only shift data and drive the SPIx_SOMI pin when SPIx_SCS is held low."

Cheers

/*
** Using the Chip Select(CS) 0 pin of SPI1 to communicate with the Fingerprint Sensor.
*/
SPI1CSPinMuxSetup(2);

Is "Chip Select(CS) 0 pin" a typo and "pin 2" meant, i.e. is *slave* chip select pin SPI1_SCSn_2 used then?

Hello Titus,
thank you for elaborating on that. I continued reading in SPRUFM4 ("TMS320C674x/OMAP-L1x Processor Serial Peripheral Interface (SPI) User's Guide") now as this provides a more detailed understanding of the SPI interface. Especailly section "2.8 SPI Operation: 4-Pin with Chip Select Mode" provides information why use of the SPIx_SCSN[n] can be useful!
Matthias