Zephyr Power & Performance
Maximize the efficiency of your embedded system by balancing power consumption and computational performance.
Core Workflows
1. Power Management (PM)
Implement system-level and peripheral-specific power saving strategies.
- •Reference: power_management.md
- •Key Tools:
pm_device_action_run,pm_state_set, Residency hooks.
2. Performance Tuning
Optimize critical code paths and monitor system resources.
- •Reference: performance_tuning.md
- •Key Tools:
CONFIG_THREAD_ANALYZER, Linker Map, Code relocation.
3. Memory Optimization
Relocate code and data to utilize the fastest memory available.
- •Reference: performance_tuning.md
- •Key Tools:
__ramfunc, Relocation scripts.
Quick Start (Device Suspend)
c
#include <zephyr/pm/device.h>
const struct device *spi0 = DEVICE_DT_GET(DT_NODELABEL(spi0));
void sleep_spi(void) {
pm_device_action_run(spi0, PM_DEVICE_ACTION_SUSPEND);
}
Professional Patterns (Optimization)
- •Aggressive Suspend: Transition peripherals to low-power states as soon as their transaction is complete.
- •ITCM/DTCM: Use Tightly Coupled Memory for time-critical control loops to avoid Flash latency.
- •Runtime Monitoring: Always enable the thread analyzer during development to find the "RAM floor" for your application.
- •Coordinated Sleep: To coordinate sleep across modules, see Zbus for event-driven power management.
Resources
- •References:
- •
power_management.md: System states, device PM, and hooks. - •
performance_tuning.md: Optimization strategies and relocation.
- •