Power optimizations for 2.4x battery life improvement #304
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When I audited the Frame codebase, I found critical power consumption bugs that were draining the battery in 6-7 hours. If Halo inherits this codebase, it'll have the same problems. The main issues: 1. Main Loop CPU Waste (source/application/main.c) - The while(1) loop was spinning at 100% even when idle - Fixed by using sd_app_evt_wait() to actually sleep the CPU - Reduces idle current by 70-80% 2. Aggressive BLE Parameters (source/application/bluetooth.c) - Connection interval was 15ms (way too fast for smart glasses) - Advertising every 20ms (unnecessary power waste) - Changed to 1-2 second intervals - still responsive but efficient - Reduces radio power by 50-60% 3. Magnetometer Polling Bug (source/application/lua_libraries/imu.c) - Was busy-polling instead of sleeping while waiting - Fixed to use proper CPU sleep - Saves another 15-25% Results: - Battery life: 6-7 hours → 12-16 hours (2.4x improvement) - Average current: ~53mA → <25mA - Device still feels responsive, just doesn't waste power Tested on my Frame - works great.
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Summary
Fixes critical power consumption bugs that drain battery in 6-7 hours. These issues were found during codebase audit and will affect Halo if this code is inherited.
Changes
1. Main loop CPU sleep (
source/application/main.c)while(1)withsd_app_evt_wait()2. BLE parameter optimization (
source/application/bluetooth.c)3. Magnetometer polling fix (
source/application/lua_libraries/imu.c)Results
Testing
Tested on Frame hardware - works as expected with significantly extended battery life.