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

menu "IO Expander/GPIO Support"

config IOEXPANDER
	bool "Enable IO Expander Support"
	default n
	---help---
		This directory holds implementations of IO expander drivers.
		See include/nuttx/ioexpander/ioexpander.h for registration information.

if IOEXPANDER

config IOEXPANDER_PCA9555
	bool "PCA9555 I2C IO expander"
	default n
	depends on I2C
	---help---
		Enable support for the NXP PCA9555 IO Expander

if IOEXPANDER_PCA9555

config PCA9555_MULTIPLE
	bool "Multiple PCA9555 Devices"
	default n
	depends on EXPERIMENTAL
	---help---
		Can be defined to support multiple PCA9555 devices on board.

config PCA9555_INT_ENABLE
	bool "Enable PCA9555 Interrupt Support"
	default n
	select IOEXPANDER_INT_ENABLE
	---help---
		Enable driver interrupt functionality

config PCA9555_INT_NCALLBACKS
	int "Max number of interrupt callbacks"
	default 4
	depends on PCA9555_INT_ENABLE
	---help---
		This is the maximum number of interrupt callbacks supported

config PCA9555_SHADOW_MODE
	bool "Use Shadow Mode instead of Read-Modify-Write Operations"
	default n
	---help---
		This setting enables a mode where the output and pin
		configuration registers are held in RAM.
		With this for example we do not need to read back the
		output-register every time we want to change one pin.
		We do instead change the bit in the internal register
		and then just write this register to the IO-Expander.
		This reduces bus traffic and eliminates the problem of
		EMC-caused toggling of output pins.

config PCA9555_RETRY
	bool "Retry to send commands and data at I2C communication errors"
	default n
	---help---
		Retry to send commands and data if a I2C-communication
		error occurs (eg. caused by EMC).

endif # IOEXPANDER_PCA9555

config IOEXPANDER_TCA64XX
	bool "TCA64XX I2C IO expander"
	default n
	depends on I2C && EXPERIMENTAL
	---help---
		Enable support for the TCA64XX IO Expander

if IOEXPANDER_TCA64XX

config TCA64XX_MULTIPLE
	bool "Multiple TCA64XX Devices"
	default n
	---help---
		Can be defined to support multiple TCA64XX devices on board.

config TCA64XX_INT_ENABLE
	bool "Enable TCA64XX Interrupt Support"
	default n
	select IOEXPANDER_INT_ENABLE
	---help---
		Enable driver interrupt functionality

config TCA64XX_INT_NCALLBACKS
	int "Max number of interrupt callbacks"
	default 4
	depends on TCA64XX_INT_ENABLE
	---help---
		This is the maximum number of interrupt callbacks supported

config TCA64XX_INT_POLL
	bool "Enable interrupt poll"
	default n
	---help---
		Enable polling for missed interrupts.

config TCA64XX_INT_POLLDELAY
	int "Interrupt poll delay (used)"
	default 500000
	depends on TCA64XX_INT_POLL
	---help---
		This microsecond delay defines the polling rate for missed interrupts.

endif # IOEXPANDER_TCA64XX

config IOEXPANDER_PCF8574
	bool "PCF8574 I2C IO expander"
	default n
	depends on I2C && EXPERIMENTAL
	---help---
		Enable support for the PCF8574 IO Expander

if IOEXPANDER_PCF8574

config PCF8574_MULTIPLE
	bool "Multiple PCF8574 Devices"
	default n
	---help---
		Can be defined to support multiple PCF8574 devices on board.

config PCF8574_INT_ENABLE
	bool "Enable PCF8574 Interrupt Support"
	default n
	select IOEXPANDER_INT_ENABLE
	---help---
		Enable driver interrupt functionality

config PCF8574_INT_NCALLBACKS
	int "Max number of interrupt callbacks"
	default 4
	depends on PCF8574_INT_ENABLE
	---help---
		This is the maximum number of interrupt callbacks supported

config PCF8574_INT_POLL
	bool "Enable interrupt poll"
	default n
	---help---
		Enable polling for missed interrupts.

config PCF8574_INT_POLLDELAY
	int "Interrupt poll delay (used)"
	default 500000
	depends on PCF8574_INT_POLL
	---help---
		This microsecond delay defines the polling rate for missed interrupts.

endif # IOEXPANDER_PCF8574

config IOEXPANDER_INT_ENABLE
	bool
	default n
	---help---
		This is the global INT supported flag for io expanders

config IOEXPANDER_NPINS
	int "Number of pins"
	default 16
	---help---
		Maximum number of pins supported per driver.

config IOEXPANDER_MULTIPIN
	bool "Support multi-pin access routines"
	default n
	---help---
		This settings enable the definition of routines for
		optimized simultaneous access to multiple pins.

endif # IOEXPANDER

config DEV_GPIO
	bool "GPIO driver"
	default n
	---help---
		Enables a simple GPIO input/output driver to support application-
		space testing of hardware.

config GPIO_LOWER_HALF
	bool "GPIO Lower Half"
	default n
	depends on DEV_GPIO && IOEXPANDER
	---help---
		Enable support for a lower half driver that provides GPIO driver
		support for I/O expander pins.

endmenu # IO Expander/GPIO Support