forked from Archive/PX4-Autopilot
304 lines
8.9 KiB
Plaintext
304 lines
8.9 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see misc/tools/kconfig-language.txt.
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#
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comment "Standard C Library Options"
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config STDIO_BUFFER_SIZE
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int "C STDIO buffer size"
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default 64
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---help---
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Size of buffers using within the C buffered I/O interfaces.
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(printf, putchar, fwrite, etc.).
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config STDIO_LINEBUFFER
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bool "STDIO line buffering"
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default y
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---help---
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Flush buffer I/O whenever a newline character is found in
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the output data stream.
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config NUNGET_CHARS
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int "Number unget() characters"
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default 2
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---help---
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Number of characters that can be buffered by ungetc() (Only if NFILE_STREAMS > 0)
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config LIB_HOMEDIR
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string "Home directory"
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default "/"
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depends on !DISABLE_ENVIRON
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---help---
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The home directory to use with operations like such as 'cd ~'
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source libc/math/Kconfig
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config NOPRINTF_FIELDWIDTH
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bool "Disable sprintf support fieldwidth"
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default n
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---help---
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sprintf-related logic is a
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little smaller if we do not support fieldwidthes
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config LIBC_FLOATINGPOINT
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bool "Enable floating point in printf"
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default n
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---help---
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By default, floating point
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support in printf, sscanf, etc. is disabled.
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choice
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prompt "Newline Options"
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default EOL_IS_EITHER_CRLF
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---help---
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This selection determines the line terminating character that is used.
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Some environments may return CR as end-of-line, others LF, and others
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both. If not specified, the default is either CR or LF (but not both)
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as the line terminating charactor.
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config EOL_IS_CR
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bool "EOL is CR"
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config EOL_IS_LF
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bool "EOL is LF"
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config EOL_IS_BOTH_CRLF
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bool "EOL is CR and LF"
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config EOL_IS_EITHER_CRLF
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bool "EOL is CR or LF"
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endchoice
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config LIBC_STRERROR
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bool "Enable strerror"
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default n
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---help---
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strerror() is useful because it decodes 'errno' values into a human readable
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strings. But it can also require a lot of memory. If this option is selected,
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strerror() will still exist in the build but it will not decode error values.
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This option should be used by other logic to decide if it should use strerror()
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or not. For example, the NSH application will not use strerror() if this
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option is not selected; perror() will not use strerror() is this option is not
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selected (see also NSH_STRERROR).
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config LIBC_STRERROR_SHORT
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bool "Use short error descriptions in strerror()"
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default n
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depends on LIBC_STRERROR
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---help---
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If this option is selected, then strerror() will use a shortened string when
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it decodes the error. Specifically, strerror() is simply use the string that
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is the common name for the error. For example, the 'errno' value of 2 will
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produce the string "No such file or directory" is LIBC_STRERROR_SHORT
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is not defined but the string "ENOENT" is LIBC_STRERROR_SHORT is defined.
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config LIBC_PERROR_STDOUT
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bool "perror() to stdout"
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default n
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---help---
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POSIX requires that perror() provide its output on stderr. This option may
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be defined, however, to provide perror() output that is serialized with
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other stdout messages.
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config ARCH_LOWPUTC
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bool "Low-level console output"
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default "y"
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---help---
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architecture supports low-level, boot time console output
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config LIB_SENDFILE_BUFSIZE
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int "sendfile() buffer size"
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default 512
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---help---
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Size of the I/O buffer to allocate in sendfile(). Default: 512b
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config ARCH_ROMGETC
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bool "Support for ROM string access"
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default n
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---help---
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In Harvard architectures, data accesses and instruction accesses
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occur on different busses, perhaps concurrently. All data accesses
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are performed on the data bus unless special machine instructions
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are used to read data from the instruction address space. Also, in
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the typical MCU, the available SRAM data memory is much smaller that
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the non-volatile FLASH instruction memory. So if the application
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requires many constant strings, the only practical solution may be
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to store those constant strings in FLASH memory where they can only
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be accessed using architecture-specific machine instructions.
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If ARCH_ROMGETC is defined, then the architecture logic must export
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the function up_romgetc(). up_romgetc() will simply read one byte
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of data from the instruction space.
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If ARCH_ROMGETC, certain C stdio functions are effected: (1) All
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format strings in printf, fprintf, sprintf, etc. are assumed to lie
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in FLASH (string arguments for %s are still assumed to reside in SRAM).
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And (2), the string argument to puts and fputs is assumed to reside
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in FLASH. Clearly, these assumptions may have to modified for the
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particular needs of your environment. There is no "one-size-fits-all"
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solution for this problem.
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config ARCH_OPTIMIZED_FUNCTIONS
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bool "Enable arch optimized functions"
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default n
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---help---
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Allow for architecture optimized implementations of certain library
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functions. Architecture-specific implementations can improve overall
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system performance.
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if ARCH_OPTIMIZED_FUNCTIONS
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config ARCH_MEMCPY
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bool "memcpy()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of memcpy().
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config MEMCPY_VIK
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bool "Vik memcpy()"
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default n
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depends on !ARCH_MEMCPY
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---help---
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Select this option to use the optimized memcpy() function by Daniel Vik.
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Select this option for improved performance at the expense of increased
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size. See licensing information in the top-level COPYING file.
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if MEMCPY_VIK
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config MEMCPY_PRE_INC_PTRS
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bool "Pre-increment pointers"
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default n
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---help---
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Use pre-increment of pointers. Default is post increment of pointers.
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config MEMCPY_INDEXED_COPY
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bool "Array indexing"
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default y
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---help---
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Copying data using array indexing. Using this option, disables the
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MEMCPY_PRE_INC_PTRS option.
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config MEMCPY_64BIT
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bool "64-bit memcpy()"
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default n
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---help---
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Compiles memcpy() for architectures that suppport 64-bit operations
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efficiently.
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endif
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config ARCH_MEMCMP
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bool "memcmp()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of memcmp().
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config ARCH_MEMMOVE
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bool "memmove()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of memmove().
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config ARCH_MEMSET
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bool "memset()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of memset().
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config MEMSET_OPTSPEED
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bool "Optimize memset() for speed"
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default n
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depends on !ARCH_MEMSET
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---help---
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Select this option to use a version of memcpy() optimized for speed.
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Default: memcpy() is optimized for size.
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config MEMSET_64BIT
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bool "64-bit memset()"
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default n
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depends on MEMSET_OPTSPEED
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---help---
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Compiles memset() for architectures that suppport 64-bit operations
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efficiently.
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config ARCH_STRCHR
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bool "strchr()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strchr().
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config ARCH_STRCMP
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bool "strcmp()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strcmp().
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config ARCH_STRCPY
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bool "strcpy()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strcpy().
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config ARCH_STRNCPY
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bool "strncpy()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strncpy().
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config ARCH_STRLEN
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bool "strlen"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strlen().
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config ARCH_STRNLEN
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bool "strlen()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of strnlen().
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config ARCH_BZERO
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bool "bzero()"
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default n
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---help---
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Select this option if the architecture provides an optimized version
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of bzero().
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endif
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comment "Non-standard Helper Functions"
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config LIB_KBDCODEC
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bool "Keyboard CODEC"
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default y
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---help---
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In NuttX, a keyboard/keypad driver is simply a character driver that
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may have an (optional) encoding/decoding layer on the data returned
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by the character driver. A keyboard may return simple text data
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(alphabetic, numeric, and punctuaction) or control characters
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(enter, control-C, etc.). We can think about this the normal
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"in-band" keyboard data stream. However, in addition, most
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keyboards support actions that cannot be represented as text data.
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Such actions include things like cursor controls (home, up arrow,
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page down, etc.), editing functions (insert, delete, etc.), volume
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controls, (mute, volume up, etc.) and other special functions. We
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can think about this as special, "out-of-band" keyboard commands.
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In this case, some special encoding may be required to multiplex
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the in-band text data and out-of-band command streams.
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This option enables the functions that implement the encoding and
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decoding of keyboard data. These are the interfaces prototyped in
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include/nuttx/input/kbd_codec.h. While not correctly a part of
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the C library, it is included here because the decoding side of this
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interface must be accessible by end user programs.
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