85 lines
2.2 KiB
Plaintext
85 lines
2.2 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menu "IO Expander/GPIO Support"
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config IOEXPANDER
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bool "Enable IO Expander Support"
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default n
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---help---
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This directory holds implementations of IO expander drivers.
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See include/nuttx/ioexpander/ioexpander.h for registration information.
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if IOEXPANDER
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config IOEXPANDER_PCA9555
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bool "PCA9555 I2C IO expander"
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default n
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select I2C
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---help---
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Enable support for the NXP PCA9555 IO Expander
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if IOEXPANDER_PCA9555
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config PCA9555_MULTIPLE
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bool "Multiple PCA9555 Devices"
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default n
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depends on EXPERIMENTAL
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---help---
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Can be defined to support multiple PCA9555 devices on board.
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config PCA9555_INT_ENABLE
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bool "Enable PCA9555 Interrupt Support"
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default n
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select IOEXPANDER_INT_ENABLE
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---help---
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Enable driver interrupt functionality
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endif # IOEXPANDER_PCA9555
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config IOEXPANDER_INT_ENABLE
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bool
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default y if PCA9555_INT_ENABLE
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---help---
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This is the global INT supported flag for io expanders
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config IOEXPANDER_MULTIPIN
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bool "Support multi-pin access routines"
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default n
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---help---
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This settings enable the definition of routines for
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optimized simultaneous access to multiple pins.
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config IOEXPANDER_SHADOW_MODE
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bool "Use Shadow Mode instead of Read-Modify-Write Operations"
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default n
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---help---
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This setting enables a mode where the output and pin
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configuration registers are held in RAM.
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With this for example we do not need to read back the
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output-register every time we want to change one pin.
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We do instead change the bit in the internal register
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and then just write this register to the IO-Expander.
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This reduces bus traffic and eliminates the problem of
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EMC-caused toggling of output pins.
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config IOEXPANDER_RETRY
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bool "Retry to send commands and data at I2C communication errors"
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default n
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---help---
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Retry to send commands and data if a I2C-communication
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error occurs (eg. caused by EMC).
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endif # IOEXPANDER
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config DEV_GPIO
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bool "GPIO driver"
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default n
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---help---
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Enables a simple GPIO input/output driver to support application-
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space testing of hardware.
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endmenu # IO Expander/GPIO Support
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