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CONFIG_ZERO_LATENCY_IRQS¶
Enable zero-latency interrupts
Type: bool
Help¶
The kernel may reserve some of the highest interrupts priorities in the system for its own use. These interrupts will not be masked by interrupt locking. When connecting interrupts the kernel will offset all interrupts to lower priority than those reserved by the kernel. Zero-latency interrupt can be used to set up an interrupt at the highest interrupt priority which will not be blocked by interrupt locking. Since Zero-latency ISRs will run in the same priority or possibly at higher priority than the rest of the kernel they cannot use any kernel functionality.
Direct dependencies¶
CPU_CORTEX_M_HAS_BASEPRI && (ARMV6_M_ARMV8_M_BASELINE || ARMV7_M_ARMV8_M_MAINLINE) && CPU_CORTEX_M && ARM
(Includes any dependencies from if’s and menus.)
Defaults¶
No defaults. Implicitly defaults to n.
Kconfig definition¶
At arch/arm/core/cortex_m/Kconfig:324
Included via Kconfig:10 → Kconfig.zephyr:29 → arch/Kconfig:15 → arch/arm/Kconfig:13 → arch/arm/core/Kconfig:166
Menu path: (top menu) → ARM Options → ARM Cortex-M0/M0+/M3/M4/M7/M23/M33 options
config ZERO_LATENCY_IRQS
bool
prompt "Enable zero-latency interrupts" if CPU_CORTEX_M_HAS_BASEPRI && (ARMV6_M_ARMV8_M_BASELINE || ARMV7_M_ARMV8_M_MAINLINE) && CPU_CORTEX_M && ARM
depends on CPU_CORTEX_M_HAS_BASEPRI && (ARMV6_M_ARMV8_M_BASELINE || ARMV7_M_ARMV8_M_MAINLINE) && CPU_CORTEX_M && ARM
help
The kernel may reserve some of the highest interrupts priorities in
the system for its own use. These interrupts will not be masked
by interrupt locking.
When connecting interrupts the kernel will offset all interrupts
to lower priority than those reserved by the kernel.
Zero-latency interrupt can be used to set up an interrupt at the
highest interrupt priority which will not be blocked by interrupt
locking.
Since Zero-latency ISRs will run in the same priority or possibly at
higher priority than the rest of the kernel they cannot use any
kernel functionality.
(Definitions include propagated dependencies, including from if’s and menus.)