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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include "redpitaya/rp.h"

int main(int argc, char **argv){
    /* Print error, if rp_Init() function failed */
    if(rp_Init() != RP_OK){
        fprintf(stderr, "Rp api init failed!\n");
    }
//################################SET UP BUFFER#########################################
    uint32_t buff_size = 16384; //16384
    float *buff = (float *)malloc(buff_size * sizeof(float));
//################################GENERATE MODULATING WAVE#########################################
    rp_AcqReset();
    rp_GenReset();
    rp_GenWaveform(RP_CH_1, RP_WAVEFORM_SINE);
    rp_GenOutEnable(RP_CH_1);
    rp_AcqSetDecimation(RP_DEC_1);
    rp_AcqSetTriggerDelayNs(133340);
//################################SET UP ACQUIRING THE SIGNAL#########################################
    rp_GenAmp(RP_CH_1, 1.0);
    rp_GenFreq(RP_CH_1, 10000000.0);
    rp_AcqStart();
    sleep(0.0001333); //16385/125000000
//################################READ THE BUFFER#########################################
    rp_GenTrigger(RP_CH_1);
    rp_AcqGetOldestDataV(RP_CH_1, &buff_size, buff);
//###############################PHASE SHIFTING##########################################
    int i;
    double totalReal = 0;
    double totalImaginary = 0;
    double mixReal[buff_size];
    double mixImaginary[buff_size];
    double phi = 0;
    //16385
    for(i = 0; i < buff_size; i++){
        mixReal[i] = buff[i]*sin(((double)i/122880000)*2*3.14*10000000);//need to change argument based on sampling rate
        mixImaginary[i] = buff[i]*cos(((double)i/122880000)*2*3.14*10000000);
        totalReal += mixReal[i];
        totalImaginary += mixImaginary[i];
    }
    phi = atan((totalImaginary/buff_size) / (totalReal/buff_size));
    //rp_GenOutDisable(RP_CH_1);
    int j;
    FILE * fp;
    fp = fopen ("testoutput.txt", "w+");
    for(j = 0; j < buff_size; j++){
        printf("%f\n", buff[j]);
        fprintf(fp, "%f\n",buff[j]);
    }
    printf("%f\n", phi);
    fclose(fp);
    /* Releasing resources */
    free(buff);
    rp_Release();
    return 0;
}