Defines standard SPI-specific interfaces for driver development.
A driver needs to use the SPI-specific interfaces for data writing and reading before performing any operations on an SPI-compliant device.
Data Structure Name
Defines the general SPI device descriptor, which can be used as the unique identifier of an SPI device. When operating an SPI device, you need to specify a descriptor of the SpiDevInfo type, and obtain the handle of the SPI device by calling SpiOpen.
Defines the custom SPI transfer message.
Defines the configuration of an SPI device.
Macro Name and Value
SPI_CLK_PHASE (1 << 0)
Indicates the SPI clock phase. The value 0 indicates that data will be sampled on the first clock edge, and 1 indicates that data will be sampled on the second clock edge.
SPI_CLK_POLARITY (1 << 1)
Indicates the SPI clock polarity. The value 0 indicates a low-level clock signal in the idle state, and 1 indicates a high-level clock signal in the idle state.
SPI_MODE_3WIRE (1 << 2)
Indicates that a single data line is used for both input and output.
SPI_MODE_LOOP (1 << 3)
Indicates the SPI loopback mode.
SPI_MODE_LSBFE (1 << 4)
Indicates the SPI data transfer order. The value 0 indicates that data is transferred from the most significant bit (MSB) to the least significant bit (LSB), and 1 indicates the opposite.
SPI_MODE_NOCS (1 << 5)
Indicates that there is only one SPI device, and no chip select (CS) is required.
SPI_MODE_CS_HIGH (1 << 6)
Indicates that the CS level is high when an SPI device is selected.
SPI_MODE_READY (1 << 7)
Indicates that the SPI device is set to low for pausing data transfer.
SpiOpen (const struct SpiDevInfoinfo)
Obtains the handle of an SPI device.
SpiClose (struct DevHandlehandle)
Releases the handle of an SPI device.
SpiTransfer (struct DevHandle handle, struct SpiMsgmsgs, uint32_t count)
Launches a custom transfer to an SPI device.
SpiRead (struct DevHandle handle, uint8_t buf, uint32_t len)
Reads data of a specified length from an SPI device.
SpiWrite (struct DevHandle handle, uint8_t buf, uint32_t len)
Writes data of a specified length to an SPI device.
SpiSetCfg (struct DevHandle handle, struct SpiCfgcfg)
Sets configuration parameters for an SPI device.
SpiGetCfg (struct DevHandle handle, struct SpiCfg *cfg)
Obtains the configuration parameters of an SPI device.