SPI Device Drivers¶
include/nuttx/spi/spi.h. All structures and APIs needed to work with SPI drivers are provided in this header file.
struct spi_ops_s. Each SPI device driver must implement an instance of
struct spi_ops_s. That structure defines a call table with the following methods:
Binding SPI Drivers. SPI drivers are not normally directly accessed by user code, but are usually bound to another, higher level device driver. See for example,
int mmcsd_spislotinitialize(int minor, int slotno, FAR struct spi_dev_s *spi)in
drivers/mmcsd/mmcsd_spi.c. In general, the binding sequence is:
Get an instance of
struct spi_dev_sfrom the hardware-specific SPI device driver, and
Provide that instance to the initialization method of the higher level device driver.