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SPI Bus (spi)

SPI bus controller.

Device Type​

DEVICE_TYPE_SPI

Structure​

struct spi_msg_t {
    uint8_t * txbuf, * rxbuf;
    int len, mode, bits, speed;
};

struct spi_t {
    char * name;
    int type;
    int (*transfer)(struct spi_t * spi, struct spi_msg_t * msg);
    int (*select)(struct spi_t * spi, int cs);
    int (*deselect)(struct spi_t * spi, int cs);
    void * priv;
};

Key API​

FunctionDescription
search_spi(name)Find SPI bus by name
register_spi(spi, drv)Register an SPI bus
unregister_spi(spi)Unregister an SPI bus
spi_transfer(spi, msg)Execute SPI transfer
spi_device_write_then_read(dev, ...)SPI device write then read

Description​

SPI bus controller interface. Supports single/dual/quad/octuple bus widths, configurable mode, bit width and speed. The spi_device_t handle binds a bus and chip select signal.