arm,armv6m-systick

Description

ARMv6-M System Tick

Properties

Properties not inherited from the base binding file.

Name

Type

Details

external-clock-source

boolean

 
For ARM Cortex-M SysTick timer, the CLKSOURCE bit in the
SysTick Control and Status Register (CSR) selects the clock source.
If this property is present, the external reference clock is selected.
If absent, the processor/core clock is selected.

zephyr,min-timeout-cycles

int

 
Minimum SysTick timeout, in SysTick cycles. This is the smallest value the
SysTick driver will program into the timer LOAD register. It determines the
kernel's minimum available timing granularity (resolution) in conjunction
with the clock frequency (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC).

When specified, the minimum timing granularity is
(<value> cycles / CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC) seconds, subject to
a hardware floor of two cycles (a LOAD of zero stops the counter).

Otherwise, the default is derived from a fixed wall-clock budget
(SYSTICK_MIN_DELAY_US, 10 us) converted to cycles at the actual clock
frequency and floored at two cycles.

Set this property only when the default budget is unsuitable, for example
to enlarge the floor when the SysTick interrupt can be masked for longer
than 10 us (see CONFIG_CORTEX_M_SYSTICK_INTERRUPT_PRIORITY).