CC3200MODLAUNCHXL: SPI transfer on falling edge

Dear Daniel - 

if you have a look in spi.c file (inside the SDK driverlib ==>C:\ti\CC3200SDK_1.3.0\cc3200-sdk\driverlib), you can find the submodes called out (0 through 3)

those relate to the polarity and phase of the clock, as you desire to change. 

You probably want to use SPI mode 1 or 2

in the main.c file of the SPI demo for the CC3200 C:\ti\CC3200SDK_1.3.0\cc3200-sdk\example\spi_demo, there are two spots for the SPI Configuration where you can change this

one for the master ==>

// Configure SPI interface -

//
MAP_SPIConfigSetExpClk(GSPI_BASE,MAP_PRCMPeripheralClockGet(PRCM_GSPI),
SPI_IF_BIT_RATE,SPI_MODE_MASTER,SPI_SUB_MODE_0,
(SPI_SW_CTRL_CS |
SPI_4PIN_MODE |
SPI_TURBO_OFF |
SPI_CS_ACTIVEHIGH |
SPI_WL_8));

//

one for the slave ==> 

// Configure SPI interface
//
MAP_SPIConfigSetExpClk(GSPI_BASE,MAP_PRCMPeripheralClockGet(PRCM_GSPI),
SPI_IF_BIT_RATE,SPI_MODE_SLAVE,SPI_SUB_MODE_0,
(SPI_HW_CTRL_CS |
SPI_4PIN_MODE |
SPI_TURBO_OFF |
SPI_CS_ACTIVEHIGH |
SPI_WL_8));

//

You can check out the diagram in the CC3200 Technical Reference Manual on page 248  and decide which one will work for you.