File content as of revision 15:b15b4b6c6da8:

//#include "HeartRateService.h"
#include "ECGService.h"
#include "PPGService.h"
#include "filters.h"

//Register definitions
#define MAX86150_Addr 0xBC //updated per I2Cscanner, 8 bit version of 7 bit code 0x5E
#define maxi2cFreq 1000000
#define recommendedi2cFreq 400000
 
#define BaudRate 115200

#define WINDOW_SIZE 25 // number of samples for moving winfow integration for HR algo preprocessing. Effective window_size is half of this value
#define BUFF_SIZE 136  // TODO: decouple BUFF_SIZE and FIR_SIZE. now program crashes if != 136
#define FIR_SIZE 136

extern MAX86150 max86150Sensor;
extern Serial pc;
extern I2C i2c;
extern BLE &ble;
const static char     DEVICE_NAME[] = "MAX32630";
static const uint16_t uuid16_list[] = {GattService::UUID_HEART_RATE_SERVICE};

//
extern int k; // loop iteration
extern float signal[BUFF_SIZE]; //store signal segment to be filtered
extern float bp_signal[BUFF_SIZE];
extern float derivative[BUFF_SIZE];
extern float squared[BUFF_SIZE];
extern float integral[BUFF_SIZE];

//
extern int rr1[8], rr2[8], rravg1, rravg2, rrlow , rrhigh , rrmiss ;
extern long unsigned int i, j, sample_idx , curr , lastQRS , lastSlope , currentSlope ;
extern float peak_i , peak_f , threshold_i1 , threshold_i2 , threshold_f1 , threshold_f2 , spk_i , spk_f , npk_i , npk_f ;
extern bool qrs, regular, prevRegular;

// Variables for preprocessing
extern float y ; //filtered sample to be displayed
extern float prev_y ; // keep track of previous output to calculate derivative
extern float sq_y;
extern float movmean; // result of moving window integration


static int16_t hrmCounter = 100; // init HRM to 100bps
//static HeartRateService *hrServicePtr;
extern ECGService *hrServicePtr;

static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);


void connectionCallback(const Gap::ConnectionCallbackParams_t *params)
{
    pc.printf("Connected to BLE Client...\n");
   max86150Sensor.begin(i2c, recommendedi2cFreq, MAX86150_Addr); 
    wait_ms(300);
   
    //unsigned char partID = max86150Sensor.readPartID();
    unsigned char partID = max86150Sensor.readRegister8(MAX86150_Addr,0xFF);
    pc.printf("Part ID is: %X\n",partID);
    while (partID != 0x1E) {/* Connection to sensor is not established */ }
    
    
    //***** SETUP SENSOR */
    max86150Sensor.setup(); //Configure sensor
    wait_ms(300);
    pc.printf("SYSCONTOL REG: %x\n", max86150Sensor.readRegister8(MAX86150_Addr,0x0D));
    pc.printf("FIFO CONFIG: %X\n",max86150Sensor.readRegister8(MAX86150_Addr,0x08));
    pc.printf("INT_EN1: %X\n", max86150Sensor.readRegister8(MAX86150_Addr,0x02));
    pc.printf("INT_EN2: %X\n", max86150Sensor.readRegister8(MAX86150_Addr,0x03));
    pc.printf("INT STATUS1: %X\n",max86150Sensor.readRegister8(MAX86150_Addr,0x00));
    pc.printf("INT STATUS2: %X\n",max86150Sensor.readRegister8(MAX86150_Addr,0x01));
    //*************************************************************//
    
    max86150Sensor.clearFIFO();
    max86150Sensor.writeRegister8(MAX86150_Addr,0x0D,0x04); //start FIFO
  
}

void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
{
    BLE::Instance().gap().startAdvertising(); // restart advertising
}

void updateSensorValue() {
    // Do blocking calls or whatever is necessary for sensor polling.
    // In our case, we simply update the HRM measurement.
    int16_t ecgsigned16;
    uint32_t ppgRed16;
    if(max86150Sensor.check()>0){         
       // if buffer is full
        if (sample_idx >= BUFF_SIZE){
            for (k=0; k<BUFF_SIZE-1; k++){  //discard oldest sample, shift samples in buffer
                signal[k] = signal[k+1];
                bp_signal[k] = bp_signal[k+1];
                derivative[k] = derivative[k+1];
                integral[k] = integral[k+1];
                squared[k] = squared[k+1];
                
            }
            curr = BUFF_SIZE-1;   // indicates that buffer is full
            prev_y = y;
            y = 0.0;  // reset filter output for current sample
        }else{ //Buffer is not full yet
            curr = sample_idx; //position at buffer is same as sample number
        }
        ecgsigned16 = (int16_t) (max86150Sensor.getFIFOECG()>>2); //read an ECG sample
        ppgRed16 = max86150Sensor.getFIFORed();
        max86150Sensor.nextSample();    // advance tail to get sample in next iteration
        signal[curr] = (float)ecgsigned16; //add sample to buffer
        sample_idx++;
        
        if (curr< FIR_SIZE-1){
            // buffer is not full yet
        }else{ //buffer is full, filter current sample
            for(k = 0; k < FIR_SIZE; k++){ //FIR bandpass filter
                y = y + FIR_BP[k] * signal[curr-k];
            }
            bp_signal[curr] = y;
        }
        sq_y = pow(y-prev_y,2);
        squared[curr] = sq_y;
        //moving window integration
        movmean = 0.0; // reset for current sample
        for(k=0; k<(int)WINDOW_SIZE/2; k++){
            //pc.printf("%d\n",(int)curr - (int)(WINDOW_SIZE));
            if ((int)curr - (int)(WINDOW_SIZE) > k){ //there are enough samples in squared[]
               // movmean = movmean + squared[(curr-k-(int)WINDOW_SIZE/2)] + squared[curr+k-(int)WINDOW_SIZE/2];
                movmean = movmean + squared[curr-k];
                
            }else{
                break;
            }          
        }
        movmean = movmean/(float)(k+1);
        integral[curr] = movmean;
        
         pc.printf("%f %f\n",movmean/1000, y/50);
         //pc.printf("%d\n",ppgRed16);
            
        hrServicePtr->updateHeartRate(ecgsigned16); //send ECG sample
        // TODO: call pan_tompkins()
        
    }
    
    
    
}

void periodicCallback(void)
{

    if (BLE::Instance().getGapState().connected) {
        eventQueue.call(updateSensorValue);
    }
}

void onBleInitError(BLE &ble, ble_error_t error)
{
    (void)ble;
    (void)error;
   /* Initialization error handling should go here */
}

void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
{
    BLE&        ble   = params->ble;
    ble_error_t error = params->error;

    if (error != BLE_ERROR_NONE) {
        onBleInitError(ble, error);
        return;
    }

    if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
        return;
    }

    ble.gap().onDisconnection(disconnectionCallback);
    ble.gap().onConnection(connectionCallback);

    /* Setup primary service. */
    //hrServicePtr = new HeartRateService(ble, hrmCounter, HeartRateService::LOCATION_FINGER);
    hrServicePtr = new ECGService(ble, hrmCounter);

    pc.printf("Setup primary service ...\n");

    /* Setup advertising. */
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::GENERIC_HEART_RATE_SENSOR);
    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));

    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
    ble.gap().setAdvertisingInterval(1000); /* 1000ms */
 
    ble.gap().startAdvertising();

    pc.printf("Exiting bleInitComplete() ... \n");
    return;
}   


void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
    BLE &ble = BLE::Instance();
    eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
}