ST STM32L4+ Series Reference Manual page 1875

RM0432
NSS
SCK
BSY
MOSI
SPE
TXE
FTLVL 00
MISO
RXNE
DMA or software control at Rx events
FRLVL
DMA Tx TICF
Assumptions for master full-duplex communication example:
•
Data size > 8 bit
If DMA is used:
•
Number of Tx frames transacted by DMA is set to 3
•
Number of Rx frames transacted by DMA is set to 3
See also
and notes.
Figure 540. Master full-duplex communication
MSB DTx1
3
Enable Tx/Rx DMA or interrupts
DTx2 DTx3
DTx1
10 11 10
4
DRx1
1
00
5
: Communication diagrams on page 1874
2
MSB DTx2
3
DMA or software control at Tx events
11 10
LSB DRx2 LSB
DRx1
10 00 10
DMA Rx TICF
for details about common assumptions
RM0432 Rev 6
Serial peripheral interface (SPI)
2
MSB DTx3
00
DRx3 LSB
DRx2 DRx3
00 10
1
00
MSv19266V2
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