ST STM32WL55JC Reference Manual page 1276

Serial peripheral interface / integrated interchip sound (SPI/I2S)
NSS
SCK
BSY
MISO
SPE
TXE
4
DTx1
FTLVL 00
MOSI
RXNE
DMA or software control at Rx events
FRLVL
DMA Tx TICF
Assumptions for slave 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.
1276/1454
Figure 357. Slave full-duplex communication
MSB DTx1
1
3
Enable Tx/Rx DMA or interrupts
DTx2 DTx3
10 11 10
DRx1
00
5
: Communication diagrams on page 1274
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 2
MSB DTx3
00
DRx3 LSB
DRx2 DRx3
00 10
RM0453
1
00
MSv32123V2