High-Performance ADC Sampling and BLE Transmission on EFR32xG24 SoC

Overview

This firmware is designed for the MGM240S wireless module, which features the EFR32xG24 SoC, showcasing high-speed ADC data sampling and transmission over BLE. The implementation uses a circular buffer to handle ADC data efficiently, ensuring no data loss, even under high-speed sampling conditions. This setup is generalizable to projects requiring precise ADC sampling, minimal latency, and reliable BLE connectivity.

The ADC pin is connected to a bus designed for interfacing with external sensors (e.g., a microphone). Using the iadc library, the system achieves a sampling frequency of 4 kHz, with BLE advertising and notifications configured for optimal performance. BLE parameters and MTU sizes are also optimized for high-throughput applications.

Features

• Module Compatibility: Designed for the MGM240S wireless module with the EFR32xG24 SoC.
• ADC Sampling:
  • Configured for 12-bit resolution.
  • Sampling at 4 kHz (adjustable via clock configurations).
  • ADC input pin: gpioPortB, pin 0.
• Circular Buffer:
  • Two halves, each holding 100 samples.
  • Flags (0x1111 and 0x0000) mark buffer boundaries for seamless BLE transmission.
  • Size customizable via BUFFER_SIZE macro.
• BLE Transmission:
  • Device advertises with a configurable timeout (default: 60 seconds).
  • Notifications sent when buffer halves are full.
  • Optimized for high-throughput BLE communication.
• Interrupt-Driven Design:
  • ADC interrupts trigger data handling and buffer updates.
  • BLE notifications are sent only when a connected device is available.

Contribution

Contributions are welcome! To contribute:

1. Fork the repository.
2. Create a new branch (git checkout -b feature-branch).
3. Make and test your changes.
4. Commit (git commit -m 'Add feature').
5. Push to the branch (git push origin feature-branch).
6. Open a pull request.