SPI master setup
SPI instance:
SPI1
SPI2
F4 has only SPI1
SPI prescaler:
/2
/4
/8
/16
/32
/64
/128
/256
SPI Mode:
0
1
2
3
8bit TX_DMA
8bit RX_DMA + TX dummy
8bit RX_DMA + TX_DMA
8bit transfer polling
16bit transfer polling
8bit 24bit tx (8bit command + 16bit data)