This project is a from-scratch implementation of a TLS2591 light sensor driver. My main goal for this project was to learn about the I2C communication protocol by implementing it from scratch between an STM32 Cortex-M4 mcu and a TSL2591 light sensor.

Things learned:

• I2C communication protocol: implementation, use, and electrical characteristics
• Configuring clocks and gpio for I2C communication
• Enabling and using the FPU in ARM Cortex-M4 microcontrollers
• Debugging I2C via Logic Analyzer

Status:

• In-Progress
• Operational
• Accuracy is high (90% - 95% accuracy compared to Photone iPhone app measurements)

Next steps:

• Switch from ~5s busy loop polling to interrupt polling

Possible future implementations:

• Function to reset I2C bus from a deadlocked state

Youtube video link (final test; 90% - 95% accuracy): https://www.youtube.com/watch?v=m42UTxCefyY&t=5s

Youtube video link (first test; 30%-50% accuracy): https://www.youtube.com/shorts/LOIbflBZAfY