251 lines
7.0 KiB
C++
251 lines
7.0 KiB
C++
/*
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Name: read_binary.cpp
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Created by: Stefan Ritt <stefan.ritt@psi.ch>
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Date: July 30th, 2014
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Purpose: Example file to read binary data saved by DRSOsc.
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Compile and run it with:
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gcc -o read_binary read_binary.cpp
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./read_binary <filename>
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This program assumes that a pulse from a signal generator is split
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and fed into channels #1 and #2. It then calculates the time difference
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between these two pulses to show the performance of the DRS board
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for time measurements.
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$Id: read_binary.cpp 22321 2016-08-25 12:26:12Z ritt $
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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typedef struct {
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char tag[3];
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char version;
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} FHEADER;
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typedef struct {
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char time_header[4];
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} THEADER;
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typedef struct {
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char bn[2];
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unsigned short board_serial_number;
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} BHEADER;
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typedef struct {
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char event_header[4];
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unsigned int event_serial_number;
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unsigned short year;
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unsigned short month;
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unsigned short day;
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unsigned short hour;
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unsigned short minute;
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unsigned short second;
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unsigned short millisecond;
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unsigned short range;
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} EHEADER;
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typedef struct {
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char tc[2];
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unsigned short trigger_cell;
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} TCHEADER;
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typedef struct {
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char c[1];
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char cn[3];
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} CHEADER;
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/*-----------------------------------------------------------------------------*/
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int main(int argc, const char * argv[])
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{
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FHEADER fh;
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THEADER th;
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BHEADER bh;
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EHEADER eh;
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TCHEADER tch;
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CHEADER ch;
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unsigned int scaler;
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unsigned short voltage[1024];
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double waveform[16][4][1024], time[16][4][1024];
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float bin_width[16][4][1024];
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int i, j, b, chn, n, chn_index, n_boards;
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double t1, t2, dt;
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char filename[256];
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int ndt;
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double threshold, sumdt, sumdt2;
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if (argc > 1)
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strcpy(filename, argv[1]);
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else {
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printf("Usage: read_binary <filename>\n");
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return 0;
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}
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// open the binary waveform file
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FILE *f = fopen(filename, "rb");
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if (f == NULL) {
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printf("Cannot find file \'%s\'\n", filename);
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return 0;
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}
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// read file header
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fread(&fh, sizeof(fh), 1, f);
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if (fh.tag[0] != 'D' || fh.tag[1] != 'R' || fh.tag[2] != 'S') {
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printf("Found invalid file header in file \'%s\', aborting.\n", filename);
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return 0;
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}
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if (fh.version != '2') {
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printf("Found invalid file version \'%c\' in file \'%s\', should be \'2\', aborting.\n", fh.version, filename);
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return 0;
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}
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// read time header
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fread(&th, sizeof(th), 1, f);
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if (memcmp(th.time_header, "TIME", 4) != 0) {
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printf("Invalid time header in file \'%s\', aborting.\n", filename);
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return 0;
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}
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for (b = 0 ; ; b++) {
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// read board header
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fread(&bh, sizeof(bh), 1, f);
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if (memcmp(bh.bn, "B#", 2) != 0) {
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// probably event header found
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fseek(f, -4, SEEK_CUR);
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break;
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}
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printf("Found data for board #%d\n", bh.board_serial_number);
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// read time bin widths
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memset(bin_width[b], 0, sizeof(bin_width[0]));
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for (chn=0 ; chn<5 ; chn++) {
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fread(&ch, sizeof(ch), 1, f);
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if (ch.c[0] != 'C') {
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// event header found
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fseek(f, -4, SEEK_CUR);
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break;
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}
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i = ch.cn[2] - '0' - 1;
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printf("Found timing calibration for channel #%d\n", i+1);
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fread(&bin_width[b][i][0], sizeof(float), 1024, f);
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// fix for 2048 bin mode: double channel
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if (bin_width[b][i][1023] > 10 || bin_width[b][i][1023] < 0.01) {
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for (j=0 ; j<512 ; j++)
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bin_width[b][i][j+512] = bin_width[b][i][j];
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}
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}
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}
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n_boards = b;
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// initialize statistics
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ndt = 0;
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sumdt = sumdt2 = 0;
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// loop over all events in the data file
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for (n=0 ; ; n++) {
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// read event header
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i = (int)fread(&eh, sizeof(eh), 1, f);
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if (i < 1)
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break;
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printf("Found event #%d %d %d\n", eh.event_serial_number, eh.second, eh.millisecond);
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// loop over all boards in data file
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for (b=0 ; b<n_boards ; b++) {
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// read board header
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fread(&bh, sizeof(bh), 1, f);
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if (memcmp(bh.bn, "B#", 2) != 0) {
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printf("Invalid board header in file \'%s\', aborting.\n", filename);
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return 0;
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}
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// read trigger cell
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fread(&tch, sizeof(tch), 1, f);
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if (memcmp(tch.tc, "T#", 2) != 0) {
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printf("Invalid trigger cell header in file \'%s\', aborting.\n", filename);
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return 0;
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}
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if (n_boards > 1)
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printf("Found data for board #%d\n", bh.board_serial_number);
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// reach channel data
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for (chn=0 ; chn<4 ; chn++) {
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// read channel header
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fread(&ch, sizeof(ch), 1, f);
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if (ch.c[0] != 'C') {
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// event header found
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fseek(f, -4, SEEK_CUR);
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break;
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}
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chn_index = ch.cn[2] - '0' - 1;
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fread(&scaler, sizeof(int), 1, f);
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fread(voltage, sizeof(short), 1024, f);
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for (i=0 ; i<1024 ; i++) {
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// convert data to volts
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waveform[b][chn_index][i] = (voltage[i] / 65536. + eh.range/1000.0 - 0.5);
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// calculate time for this cell
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for (j=0,time[b][chn_index][i]=0 ; j<i ; j++)
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time[b][chn_index][i] += bin_width[b][chn_index][(j+tch.trigger_cell) % 1024];
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}
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}
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// align cell #0 of all channels
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t1 = time[b][0][(1024-tch.trigger_cell) % 1024];
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for (chn=1 ; chn<4 ; chn++) {
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t2 = time[b][chn][(1024-tch.trigger_cell) % 1024];
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dt = t1 - t2;
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for (i=0 ; i<1024 ; i++)
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time[b][chn][i] += dt;
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}
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t1 = t2 = 0;
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threshold = 0.3;
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// find peak in channel 1 above threshold
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for (i=0 ; i<1022 ; i++)
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if (waveform[b][0][i] < threshold && waveform[b][0][i+1] >= threshold) {
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t1 = (threshold-waveform[b][0][i])/(waveform[b][0][i+1]-waveform[b][0][i])*(time[b][0][i+1]-time[b][0][i])+time[b][0][i];
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break;
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}
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// find peak in channel 2 above threshold
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for (i=0 ; i<1022 ; i++)
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if (waveform[b][1][i] < threshold && waveform[b][1][i+1] >= threshold) {
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t2 = (threshold-waveform[b][1][i])/(waveform[b][1][i+1]-waveform[b][1][i])*(time[b][1][i+1]-time[b][1][i])+time[b][1][i];
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break;
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}
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// calculate distance of peaks with statistics
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if (t1 > 0 && t2 > 0) {
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ndt++;
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dt = t2 - t1;
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sumdt += dt;
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sumdt2 += dt*dt;
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}
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}
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}
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// print statistics
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printf("dT = %1.3lfns +- %1.1lfps\n", sumdt/ndt, 1000*sqrt(1.0/(ndt-1)*(sumdt2-1.0/ndt*sumdt*sumdt)));
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return 1;
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}
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