Stm32 SPI bus

About SPI in Data Manual

2.3.18 serial peripheral interface (SPI)
Up to two spis are able to communicate up to 18 Mbits/s in slave and master modes in fullduplexand simplex communication modes. the 3-bit prescaler gives 8 master modefrequencies and the frame is retriable to 8 bits or 16 bits. the hardware crcgeneration/Verification
Supports basic SD card/MMC modes.
Both spis can be served by the DMA Controller

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A simple example of SPI Configuration

/* Spi1 configuration ------------------------------------------------------*/
Spi_initstructure.spi_direction = spi_direction_2lines_fullduplex;
Spi_initstructure.spi_mode = spi_mode_master;
Spi_initstructure.spi_datasize = spi_datasize_16b;
Spi_initstructure.spi_cpol = spi_cpol_low;
Spi_initstructure.spi_cpha = spi_cpha_2edge;
Spi_initstructure.spi_nss = spi_nss_soft;
Spi_initstructure.spi_baudrateprescaler = spi_baudrateprescaler_8;
Spi_initstructure.spi_firstbit = spi_firstbit_msb;
Spi_initstructure.spi_crcpolynomial = 7;
Spi_init (spi1, & spi_initstructure );

/* Enable spi1 CRC calculation */
Spi_calculatecrc (spi1, enable );

/* Enable spi1 */
Spi_cmd (spi1, enable );

Sending Function

/* Wait For spi1 TX buffer empty */
While (spi_i2s_getflagstatus (spi1, spi_i2s_flag_txe) = reset );
/* Send spi1 data */
Spi_i2s_senddata (spi1, spigot buffer_tx [txidx ++]);

Receiving Function

/* Wait For spi1 Data Partition tion */
While (spi_i2s_getflagstatus (spi1, spi_i2s_flag_rxne) = reset );
/* Read spi1 received data */
Spi1_buffer_rx [rxidx ++] = spi_i2s_receivedata (spi1 );