128 lines
3.7 KiB
Plaintext
128 lines
3.7 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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menuconfig TIMER
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bool "Timer Support"
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default n
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---help---
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This selection enables building of the "upper-half" timer
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driver. See include/nuttx/timer.h for further timer driver
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information.
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menuconfig RTC
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bool "RTC Driver Support"
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default n
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---help---
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This selection enables configuration of a real time clock (RTCdriver.
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See include/nuttx/rtc.h for further RTC driver information.
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Most RTC drivers are MCU specific and may require other specific
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settings.
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if RTC
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config RTC_DATETIME
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bool "Date/Time RTC Support"
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default n
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---help---
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There are two general types of RTC: (1) A simple battery backed
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counter that keeps the time when power is down, and (2) a full
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date / time RTC the provides the date and time information, often in
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BCD format. If RTC_DATETIME is selected, it specifies this second kind
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of RTC. In this case, the RTC is used to "seed" the normal NuttX timer
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and the NuttX system timer provides for higher resolution time.
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if !RTC_DATETIME
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config RTC_HIRES
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bool "Hi-Res RTC Support"
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default n
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---help---
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If RTC_DATETIME not selected, then the simple, battery backed counter
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is used. There are two different implementations of such simple
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counters based on the time resolution of the counter: The typical RTC
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keeps time to resolution of 1 second, usually supporting a 32-bit
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time_t value. In this case, the RTC is used to "seed" the normal NuttX
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timer and the NuttX timer provides for higherresoution time.
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If RTC_HIRES is enabled in the NuttX configuration, then the RTC
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provides higher resolution time and completely replaces the system
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timer for purpose of date and time.
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config RTC_FREQUENCY
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int "Hi-Res RTC frequency"
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default 1
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depends on RTC_HIRES
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---help---
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If RTC_HIRES is defined, then the frequency of the high resolution RTC
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must be provided. If RTC_HIRES is not defined, RTC_FREQUENCY is
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assumed to be one Hz.
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endif # !RTC_DATETIME
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config RTC_DRIVER
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bool "RTC Driver Support"
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default n
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---help---
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This selection enables building of the "upper-half" RTC
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driver. See include/nuttx/rtc.h for further RTC driver
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information.
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if RTC_DRIVER
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config RTC_ALARM
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bool "RTC Alarm Support"
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default n
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---help---
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Enable if the RTC hardware supports setting of an alarm. A callback
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function will be executed when the alarm goes off.
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config RTC_PERIODIC
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bool "RTC Periodic Interrupts"
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default n
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depends on EXPERIMENTAL
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---help---
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Add interrupt controls for RTCs that support periodic interrupts.
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config RTC_ONESEC
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bool "RTC Once-per-second interrupts"
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default n
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depends on EXPERIMENTAL
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---help---
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Add interrupt controls for RTCs that support once-per-second interrupts.
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config RTC_EPOCHYEAR
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bool "RTC epoch year"
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default n
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depends on EXPERIMENTAL
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---help---
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Add controls for RTCs that support epoch year settings.
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Many RTCs encode the year in an 8-bit register which is either interpreted
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as an 8-bit binary number or as a BCD number. In both cases, the number is
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interpreted relative to this RTC's Epoch. The RTC's Epoch is initialized to
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1900 on most systems but on Alpha and MIPS it might also be initialized to
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1952, 1980, or 2000, depending on the value of an RTC register for the year.
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With some RTCs, these operations can be used to read or to set the RTC's
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Epoch, respectively.
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endif # RTC_DRIVER
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endif # RTC
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menuconfig WATCHDOG
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bool "Watchdog Timer Support"
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default n
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---help---
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This selection enables building of the "upper-half" watchdog timer
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driver. See include/nuttx/watchdog.h for further watchdog timer driver
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information.
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if WATCHDOG
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config WATCHDOG_DEVPATH
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string "Watchdog Device Path"
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default "/dev/watchdog0"
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endif # WATCHDOG
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