Description

The system processes ECG data to detect and analyze PQRST wave components through digital signal processing techniques, implemented on LCDKMAPL138.

Features

• signal preprocessing - baseline wander removal:

  • preserves ECG morphology while removing low-frequency drift
  • 2nd order Chebyshev Type II high-pass filter
  • stop-band frequency (Fstop): 0.9 Hz
  • stop-band attenuation (Astop): 4 dB
  • note: doesnt always remove all the baseline noise (depands on the application)

• signal feature extract - PQRST wave detection algorithm

  • peak detection sequence: R → Q,S → P,T
  • amplitude measurement relative to baseline
  • cardiac interval calculation
  • heart rate calculation

• fixed threshold detection:

  • R-wave: 60% of maximum signal amplitude
  • Q-wave: -10% of R wave amplitude
  • S-wave: -20% of R wave amplitude
  • P and T waves: detected in positive amplitude regions
  • fixed time-based validation between detected peaks

• real-time processing

  • 80 Hz sampling frequency
  • circular buffer implementation
  • interrupt-driven architecture

Requirements

• LCDKMAPL138 Development Kit
• Code Composer Studio IDE
• OMAPL138 Processor SDK
• TI-RTOS
• XDCtools
• UIA (Unified Instrumentation Architecture) tools

Building

1. Clone this repository
2. Open project in Code Composer Studio
3. Configure target settings:

• Disable PRU 1 and PRU 2
• Disable ETB11_0
• Configure C674X_0 as secondary processor since ARM9_0 is the main processor

4. Build and flash to LCDKMAPL138 board