Скачать или смотреть C Programming Interview Questions Part 42: How do you reduce power consumption in embedded firmware?

C Programming Interview Questions Part 42: How do you reduce power consumption in embedded firmware?

Reducing power in embedded firmware requires smart software practices and hardware awareness. Key techniques include:
1. Low Power Modes – Use sleep modes (Idle, Stop, Standby) when CPU is idle.
2. Clock Gating – Disable clocks for unused peripherals to cut switching activity.
3. Lower Clock Frequency – Reduce system clock or use dynamic frequency scaling.
4. Peripheral Management – Power down peripherals (UART, ADC, etc.) when not in use.
5. Efficient Code – Optimize loops and logic to reduce CPU wake-ups.
6. Interrupts Over Polling – Let interrupts handle events to keep CPU asleep longer.
7. Avoid Floating Point – Use fixed-point math if no FPU is present.
8. DMA Use – Offload data transfers to DMA instead of the CPU.
9. GPIO Control – Set unused pins to known states to prevent leakage.
10. External Module Management – Power off unused sensors/modules when idle.

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