Day 26 - Sensor Core Refactor

📅 Date

2026-04-XX

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🎯 Goal

Refactor I2C sensor driver into:

• Core + Bus architecture
• Transport-independent design

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🔧 What I Did

• Introduced mysensor_bus_ops
• Abstracted hardware access
• Created mysensor_core.c
• Created mysensor_i2c.c
• Updated Makefile to multi-object module

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🧪 Test Result

Driver probe

mysensor i2c probe start
mysensor_core probe start
IRQ registered
mysensor_core probed

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Stress Test Summary

IRQ mode

• irq_event_count = stable
• no skips

Polling mode

• poll_event_count matches expected
• periodic update working

Hybrid mode

• both IRQ and poll active
• skip logic observed

Cooldown test

• poll_skip_count increases significantly
• confirms cooldown works

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🧠 What I Learned

• Separation of core vs transport is critical
• bus_ops enables clean abstraction
• IRQ + Polling interaction needs careful policy design
• Cooldown is essential to avoid excessive updates

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⚠️ Issues Encountered

• container_of type mismatch
• header / struct inconsistency
• register naming inconsistency

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✅ Fixes

• unified struct mysensor_core
• corrected container_of usage
• standardized register naming

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🚀 Next Step

• Add SPI support (mysensor_spi.c)
• Verify core reusability

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