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menuconfig RT_USING_RTC
bool "Using RTC device drivers"
default n
help
Enable the RTC core so hardware real-time clocks can be registered via
`rt_hw_rtc_register`, the kernel can keep wall clock time across suspend/
resume, and applications can query or set calendar values through the
`rtc` character device. Turn this on whenever you have a peripheral or
PMIC that supplies timestamp/backup registers referenced from the device
tree; disable it only on chips that genuinely lack RTC hardware.
if RT_USING_RTC
config RT_USING_ALARM
bool "Using RTC alarm"
default n
help
Spawn the alarm service defined in `dev_alarm.c`. The driver
creates an RT-Thread worker thread that reconciles user-space
alarms with the RTC wakeup registers, automatically reprograms
oneshot/periodic alarms, and raises callbacks when the hardware
interrupt fires. Enable this if your application needs wakeup at a
given date/time; leave it disabled to save RAM/CPU when alarms are
not used.
if RT_USING_ALARM
config RT_ALARM_STACK_SIZE
int "stack size for alarm thread"
default IDLE_THREAD_STACK_SIZE
help
Specify the stack size (bytes) used by the internal alarm
management thread. Increase this when alarm callbacks perform
complex logic or use libc time conversions; shrink it on very
constrained MCUs when you are sure the callbacks stay shallow.
config RT_ALARM_TIMESLICE
int "timeslice for alarm thread"
default 5
help
Define the timeslice (OS ticks) granted to the alarm thread
when it runs at the same priority as other time-sensitive
tasks. Lower values make the system more responsive at the
cost of additional context switches; higher values slightly
delay alarm handling under load.
config RT_ALARM_PRIORITY
int "priority for alarm thread"
default 10
help
RT-Thread priority (smaller numbers are higher priority) of
the alarm management thread. Choose a priority above most
application threads if you require deterministic wakeups, or
below CPU-intensive tasks when alarm latency is less critical.
config RT_ALARM_USING_LOCAL_TIME
bool "Using local time for the alarm calculation"
default n
depends on RT_USING_ALARM
help
Make the alarm service convert timestamps with `mktime()` so
alarms follow the configured local time zone instead of UTC.
Enable this when alarms must honor daylight saving or custom
offsets; otherwise keep it disabled to avoid the overhead of
repeatedly converting between UTC and local time.
endif
config RT_USING_SOFT_RTC
bool "Using software simulation RTC device"
default n
help
Build the tick-based software RTC implementation (`dev_soft_rtc`)
for boards without dedicated RTC hardware. The driver keeps time
by accumulating system ticks and stores values in RAM only, so it
resets to the compile-time default after power loss. Enable it for
simulations or low-cost MCUs that still need an `rtc` device node;
disable it when real RTC registers are available to avoid two
competing time sources.
endif
config RT_RTC_DS1302
bool "Dallas/Maxim DS1302"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_SPI
default n
config RT_RTC_DS1307
bool "Dallas/Maxim DS1307/37/38/39/40, ST M41T11"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_I2C
default n
config RT_RTC_GOLDFISH
bool "Goldfish Real Time Clock"
depends on RT_USING_DM
depends on RT_USING_RTC
default n
config RT_RTC_HYM8563
bool "Haoyu Microelectronics HYM8563"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_I2C
default n
config RT_RTC_PCF8523
bool "NXP PCF8523"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_I2C
default n
config RT_RTC_PCF8563
bool "Philips PCF8563/Epson RTC8564"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_I2C
default n
config RT_RTC_PL031
bool "ARM PL031"
depends on RT_USING_DM
depends on RT_USING_RTC
default n
config RT_RTC_RX8010
bool "Epson RX8010SJ"
depends on RT_USING_DM
depends on RT_USING_RTC
depends on RT_USING_I2C
default n
if RT_USING_DM && RT_USING_RTC
osource "$(SOC_DM_RTC_DIR)/Kconfig"
endif
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