вот я о чем: RM0091 стр 769-770
1. Enable DMA Rx buffer in the RXDMAEN bit in the SPI_CR2 register, if DMA Rx is
used.
2. Enable DMA streams for Tx and Rx in DMA registers, if the streams are used.
3. Enable DMA Tx buffer in the TXDMAEN bit in the SPI_CR2 register, if DMA Tx is used.
4. Enable the SPI by setting the SPE bit.
RM0360 стр 651
1. Write proper GPIO registers: Configure GPIO for MOSI, MISO and SCK pins.
2. Write to the SPI_CR1 register:
a) Configure the serial clock baud rate using the BR[2:0] bits (Note: 4).
b) Configure the CPOL and CPHA bits combination to define one of the four
relationships between the data transfer and the serial clock (CPHA must be
cleared in NSSP mode). (Note: 2 - except the case when CRC is enabled at TI
mode).
c) Select simplex or half-duplex mode by configuring RXONLY or BIDIMODE and
BIDIOE (RXONLY and BIDIMODE can't be set at the same time).
d) Configure the LSBFIRST bit to define the frame format (Note: 2).
e) Configure the CRCL and CRCEN bits if CRC is needed (while SCK clock signal is
at idle state).
f) Configure SSM and SSI (Notes: 2 & 3).
g) Configure the MSTR bit (in multimaster NSS configuration, avoid conflict state on
NSS if master is configured to prevent MODF error).
3. Write to SPI_CR2 register:
a) Configure the DS[3:0] bits to select the data length for the transfer.
b) Configure SSOE (Notes: 1 & 2 & 3).
c) Set the FRF bit if the TI protocol is required (keep NSSP bit cleared in TI mode).
d) Set the NSSP bit if the NSS pulse mode between two data units is required (keep
CHPA and TI bits cleared in NSSP mode).
e) Configure the FRXTH bit. The RXFIFO threshold must be aligned to the read
access size for the SPIx_DR register.
f) Initialize LDMA_TX and LDMA_RX bits if DMA is used in packed mode.
4. Write to SPI_CRCPR register: Configure the CRC polynomial if needed.
5. Write proper DMA registers: Configure DMA streams dedicated for SPI Tx and Rx in
DMA registers if the DMA streams are used.