Figure 357. Master Full-Duplex Communication - STMicroelectronics STM32WL5 Series Reference Manual

RM0453
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.
Serial peripheral interface / integrated interchip sound (SPI/I2S)

Figure 357. 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 1270
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
RM0453 Rev 5
2
MSB DTx3
00
DRx3 LSB
DRx2 DRx3
00 10
1
00
MSv19266V2
1271/1450
1311