CC3235MODSF: how to use spi slave with dma

hello

I can use spi with spislave demo of cc3235modsf.  then i want to use spi slave with dma.

i read SPICC32XXDMA.h and SPICC32XXDMA.c , but i do not know how to use it.

i use system_config to config spi interface.

in the spislave demo, the spi config step is follows

1: void SPI_init(void);

2: void SPI_Params_init(SPI_Params *params);

3: SPI_Handle SPI_open(uint_least8_t index, SPI_Params *params);   here index is my spi config name

4: SPI_transfer(SPI_Handle handle, SPI_Transaction *transaction);

then the the spi dam config is follows

1: SPICC32XXDMA_init(SPI_Handle handle);   the "handle"  where to get ,  here spi is not open

2: void SPI_Params_init(SPI_Params *params); 

3: SPI_Handle SPICC32XXDMA_open(SPI_Handle handle, SPI_Params *params);   here red "SPI_Handle"  ,where to get 

4: bool SPICC32XXDMA_transfer(SPI_Handle handle, SPI_Transaction *transaction);

my question is:

1:  where to use my spi config name  with dma step ?

2:  the dma config step is ok?  where to use my spi configure name

3：how step to use spi with dma?

4:  what is "SPI_handle handle" of dma step?  where to get it ?

thanks