main.cpp

00001 // Author: kasturir@ucla.edu (Kasturi Rangan Raghavan)
00002 // \file
00003 // QRSDet library for QRS delays
00004 // Very naive and basic implementation to demonstrate
00005 // QRS code ported from QRSDet.
00006 //
00007 // Note:
00008 //   Change both the wait_us and qrsdet::SAMPLE_RATE (in qrsdet-params.h)
00009 //   to adjust to different sampling rates. Currently set up for 125Hz
00010 // Also, the offset/scale for reading ADC input may have to be adjusted
00011 //
00012 // Note2:
00013 // Since function are not pure, local variables stored as static, 
00014 // That means the filter functions like deriv1, etc should be left alone.
00015 
00016 #include "mbed.h"
00017 #include "qrsdet2-inl.h"
00018 #include "qrsfilt-inl.h"
00019 
00020 DigitalOut peak(LED1);
00021 DigitalOut time_out(LED4);
00022 DigitalOut time_out1(p18);
00023 PwmOut bridge_out(LED2);
00024 
00025 AnalogIn ecg_in(p20);
00026 float float_val;
00027 int int_val;
00028 int delay; // return of QRSDet
00029 int main() {
00030   time_out = 1;
00031     //qrsdet::QRSDet(0, 1);
00032     qrsdet::deriv1(0, 1);
00033     peak = 1;
00034     while(1) {
00035         float_val = ecg_in.read();
00036         int_val = float_val*128;
00037         delay = qrsdet::QRSDet(int_val, 0);
00038         if ( delay > 0) {
00039             peak = !peak;
00040         }
00041         wait_us(8000); // 125Hz
00042         bridge_out = float_val;
00043         time_out = !time_out;
00044         time_out1 = !time_out1;
00045     }
00046 }