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SPI Configuration

Question asked by rodriguey.pablo on Nov 1, 2011

I was learning reading the SPI documentation and there is something I do not understand.
In the file stm32f10x_spi.h it is defined:

#define SPI_Direction_2Lines_FullDuplex ((uint16_t)0x0000)
#define SPI_Direction_2Lines_RxOnly     ((uint16_t)0x0400)
#define SPI_Direction_1Line_Rx          ((uint16_t)0x8000)
#define SPI_Direction_1Line_Tx          ((uint16_t)0xC000)

... the four modalities for the SPI. The one I do not understand how the SPI_Direction_2Lines_RxOnly works. Can anybody explain me how to connect  the wires (i.e. MISO, MOSI) between the slave and the master and how the flow of data work?

Thanks in advance,