nuttx/drivers/spi/Kconfig

#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#

config ARCH_HAVE_SPI_CRCGENERATION
	bool
	default n

config ARCH_HAVE_SPI_CS_CONTROL
	bool
	default n

config ARCH_HAVE_SPI_BITORDER
	bool
	default n

menuconfig SPI
	bool "SPI Driver Support"
	default n
	---help---
		This selection enables selection of common SPI options.  This option
		should be enabled by all platforms that support SPI interfaces.
		See include/nuttx/spi/spi.h for further SPI driver information.

if SPI

config SPI_SLAVE
	bool "SPI Slave"
	default n
	---help---
		Enable support for SPI Slave features

if SPI_SLAVE

config SPI_SLAVE_DRIVER
	bool "SPI Slave character driver"
	default n
	---help---
		Built-in support for a character driver at /dev/spislv[N] that may be
		used to perform SPI bus transfers from applications.
		The intent of this driver is to support SPI Slave testing.

if SPI_SLAVE_DRIVER

config SPI_SLAVE_DRIVER_MODE
	int "SPI Slave character driver default mode"
	default 0
	---help---
		Default SPI Slave character driver mode, where:
		0 = CPOL=0, CPHA=0
		1 = CPOL=0, CPHA=1
		2 = CPOL=1, CPHA=0
		3 = CPOL=1, CPHA=1

config SPI_SLAVE_DRIVER_WIDTH
	int "SPI Slave character driver default bit width"
	default 8
	---help---
		Number of bits per SPI Slave transfer (default 8).

config SPI_SLAVE_DRIVER_BUFFER_SIZE
	int "SPI Slave character driver TX and RX buffer sizes"
	default 128
	---help---
		Size of the internal TX and RX buffers of the SPI Slave
		character driver.

config SPI_SLAVE_DRIVER_COLORIZE_TX_BUFFER
	bool "SPI Slave character driver colorize TX buffer"
	default n
	---help---
		Initialize entries of the TX buffer with a given pattern.
		If the SPI Slave controller performs a call to "getdata" API during
		the "bind" operation, the colorized buffer may be sent as part of the
		first TX transfer of the SPI Slave controller.
		This feature might be useful for a quick communication test between
		Master and Slave.

config SPI_SLAVE_DRIVER_COLORIZE_PATTERN
	hex "SPI Slave character driver colorize pattern"
	default 0xa5
	depends on SPI_SLAVE_DRIVER_COLORIZE_TX_BUFFER
	---help---
		Pattern to be used as the coloration of the TX buffer.

config SPI_SLAVE_DRIVER_COLORIZE_NUM_BYTES
	int "SPI Slave character driver colorize number of bytes"
	default 4
	depends on SPI_SLAVE_DRIVER_COLORIZE_TX_BUFFER
	---help---
		Number of bytes of the TX buffer to be colorized.

endif # SPI_SLAVE_DRIVER

config SPI_SLAVE_DMA
	bool "SPI Slave DMA"
	default n
	depends on ARCH_DMA && EXPERIMENTAL
	---help---
		Enable support for DMA data transfers (not yet implemented).

endif # SPI_SLAVE

config SPI_EXCHANGE
	bool "SPI exchange"
	default y
	---help---
		Driver supports a single exchange method (vs a recvblock() and
		sndblock() methods).

config SPI_CMDDATA
	bool "SPI CMD/DATA"
	default n
	---help---
		Devices on the SPI bus require out-of-band support to distinguish
		command transfers from data transfers.  Such devices will often support
		either 9-bit SPI (yech) or 8-bit SPI and a GPIO output that selects
		between command and data.

config SPI_CALLBACK
	bool "Media change callbacks"
	default y if MMCSD_SPI
	default n if !MMCSD_SPI
	---help---
		Support the callback method in the SPI interface.  This will allow
		the SPI-based MMC/SD driver to get a notification of changes in the
		card status when an SD card is inserted or removed.

config SPI_HWFEATURES
	bool
	default n
	---help---
		Selected only if a specific H/W feature is selected.  This is
		basically the OR of any specific hardware feature and enables
		the SPI hwfeatures() interface method.

config SPI_CRCGENERATION
	bool
	default n
	select SPI_HWFEATURES
	depends on ARCH_HAVE_SPI_CRCGENERATION
	---help---
		Selected by MCU Kconfig logic if implementation supports automatic
		generation of SPI CRCs.  Enables the HWFEAT_CRCGENERATION option
		as well as the hwfeartures() interface method.

config SPI_CS_CONTROL
	bool "SPI CS Behavior Control"
	default n
	select SPI_HWFEATURES
	depends on ARCH_HAVE_SPI_CS_CONTROL
	---help---
		Enables possibilities to define the behavior of CS.
		Also enables the hwfeatures() interface method.

config SPI_BITORDER
	bool "SPI Bit Order Control"
	default n
	select SPI_HWFEATURES
	depends on ARCH_HAVE_SPI_BITORDER
	---help---
		Enables capability to select MSB- or LSB-first hardware feature for
		data transfers.

config SPI_CS_DELAY_CONTROL
	bool "SPI CS Delay Control"
	default n
	---help---
		Enables possibilities to define the SPI-ChipSelect-Delays like
		time between ChipSelect assertion and first Data-Bit, the time
		between the last Data-Bit and the de-assertion and the minimum
		delay between two ChipSelects.

		This option enables the setdelay() interface method.

config SPI_TRIGGER
	bool "SPI DMA trigger"
	default n
	select SPI_HWFEATURES
	depends on SPI_EXCHANGE
	---help---
		Some architectures benefit from delaying the start of DMA from the
		DMA setup.  If this option is selected, then an SPI_TRIGGER() method
		is supported:  The DMA is setup with in in SPI_EXCHANGE() but does
		not actually begin until SPI_TRIGGER() is called.

config SPI_DRIVER
	bool "SPI character driver"
	default n
	depends on SPI_EXCHANGE
	---help---
		Build in support for a character driver at /dev/spi[N] that may be
		used to perform SPI bus transfers from applications.  The intent of
		this driver is to support SPI testing.  It is not suitable for use
		in any real driver application.

config SPI_BITBANG
	bool "SPI bit-bang device"
	default n
	---help---
		Enable support for a generic SPI bit-bang device.
		See include/nuttx/spi/spi_bitbang.h for further information.

if SPI_BITBANG

config SPI_BITBANG_VARWIDTH
	bool "SPI bit-bang variable width transfers"
	default n
	---help---
		Enable support for a variable data width transfers.  Default: 8-bit
		only.

endif # SPI_BITBANG
endif # SPI