Notes

This module defines locks to constitue critical sections by disabling interrupts based on their priority. This is accomplished by manipulating the Status.IPL bits.

Example

Lock all interrupts of priority level 4 or less.

uint32_t p = 4;
uint32_t x;

x = ao_sys_lock_ir(p);
{
    // ...

    // Critical section.
    // Interrupts are disabled up to and including priority level p.

    // ...
}
ao_sys_unlock_ir(x);

Include

Functions

ao_sys_lock_ir

uint32_t ao_sys_lock_ir(uint32_t p2);

Enters a critical section. This function disables all interrupts whose priority is not greater than p by manipulating the Status.IPL bits.

ao_sys_unlock_ir

void ao_sys_unlock_ir(uint32_t x);

Exits a critical section. This function restores the previous value of the Status.IPL bits.