Roy Sandberg / Mbed 2 deprecated BLE_ECG

I've got some basic filter code setup (but not yet tested).

Dependencies:   BLE_API Queue mbed nRF51822

Fork of BLE_HeartRate by Bluetooth Low Energy

sampler.cpp@62:8e2fbe131b53, 2015-06-28 (annotated)

Committer:
roysandberg
Date:
Sun Jun 28 03:06:00 2015 +0000
Revision:
62:8e2fbe131b53
Parent:
61:1de72bdab0ef 
Working Beat Detection and Analysis

Who changed what in which revision?

UserRevisionLine numberNew contents of line
roysandberg 61:1de72bdab0ef 1 #include "mbed.h"
roysandberg 62:8e2fbe131b53 2 #include <qrsdet.h>
roysandberg 61:1de72bdab0ef 3 // Use a ticker (interrupt routine) to sample the ADC at a fast rate (is 200Khz the max?), and generate an average value
roysandberg 61:1de72bdab0ef 4 // Use another ticker to grab the average value at 1Khz, which is the maximum useful sampling rate for HRV data collection
roysandberg 61:1de72bdab0ef 5
roysandberg 61:1de72bdab0ef 6
roysandberg 61:1de72bdab0ef 7 // These need to divide evenly into each other
roysandberg 61:1de72bdab0ef 8
roysandberg 62:8e2fbe131b53 9 // 3 means sample at 8x read-out rate - SAMPLE_RATE is defined in qrsdet.h
roysandberg 62:8e2fbe131b53 10 #define SHIFT_FOR_READ_OUT 1
roysandberg 62:8e2fbe131b53 11 #define ADC_RATE (SAMPLE_RATE<<SHIFT_FOR_READ_OUT)
roysandberg 62:8e2fbe131b53 12 #define READ_OUT_RATE_HZ SAMPLE_RATE
roysandberg 62:8e2fbe131b53 13
roysandberg 62:8e2fbe131b53 14 #define SAMPLES_PER_READOUT (1<<SHIFT_FOR_READ_OUT)
roysandberg 61:1de72bdab0ef 15
roysandberg 61:1de72bdab0ef 16 AnalogIn ECG(P0_1);
roysandberg 61:1de72bdab0ef 17 Ticker sampling_rate;
roysandberg 61:1de72bdab0ef 18 int NumReadings=0;
roysandberg 62:8e2fbe131b53 19 int32_t ReadingTotal=0;
roysandberg 61:1de72bdab0ef 20 void (*SamplingFunction)(uint32_t);
roysandberg 61:1de72bdab0ef 21
roysandberg 61:1de72bdab0ef 22
roysandberg 61:1de72bdab0ef 23 void ADC_read()
roysandberg 61:1de72bdab0ef 24 {
roysandberg 61:1de72bdab0ef 25 NumReadings++;
roysandberg 61:1de72bdab0ef 26 ReadingTotal += ECG.read_u16();
roysandberg 61:1de72bdab0ef 27 if (NumReadings == SAMPLES_PER_READOUT)
roysandberg 61:1de72bdab0ef 28 {
roysandberg 62:8e2fbe131b53 29 SamplingFunction(ReadingTotal>>SHIFT_FOR_READ_OUT);
roysandberg 61:1de72bdab0ef 30 ReadingTotal = 0;
roysandberg 61:1de72bdab0ef 31 NumReadings = 0;
roysandberg 61:1de72bdab0ef 32 }
roysandberg 61:1de72bdab0ef 33 }
roysandberg 61:1de72bdab0ef 34
roysandberg 61:1de72bdab0ef 35 void setup_sampler(void (*function)(uint32_t))
roysandberg 61:1de72bdab0ef 36 {
roysandberg 61:1de72bdab0ef 37 SamplingFunction = function;
roysandberg 62:8e2fbe131b53 38 sampling_rate.attach(&ADC_read, 1.0/ADC_RATE);
roysandberg 61:1de72bdab0ef 39 }