mirror of
https://github.com/dj0abr/SSB_HighSpeed_Modem.git
synced 2024-11-25 13:48:47 -05:00
168 lines
3.4 KiB
C++
Executable File
168 lines
3.4 KiB
C++
Executable File
/*
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* High Speed modem to transfer data in a 2,7kHz SSB channel
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* =========================================================
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* Author: DJ0ABR
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*
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* (c) DJ0ABR
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* www.dj0abr.de
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include "hsmodem.h"
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int speed = 0;
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#define MAXSPDARR 10
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int spdarr[MAXSPDARR];
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int spdarrbps[MAXSPDARR];
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#ifdef _LINUX_
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int getus()
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000 + tv.tv_usec;
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}
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#endif
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#ifdef _WIN32_
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int getus()
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{
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int actms;
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SYSTEMTIME st;
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GetSystemTime(&st);
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actms = st.wSecond * 1000 + (int)st.wMilliseconds;
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return actms * 1000;
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}
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#endif
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int meanval(int v)
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{
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static int f=1;
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if(f)
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{
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for(int i=0; i<MAXSPDARR; i++) spdarr[i] = -1;
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f=0;
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}
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for(int i=(MAXSPDARR-1); i>0; i--)
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spdarr[i] = spdarr[i-1];
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spdarr[0] = v;
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int ssum=0;
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int cnt = 0;
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for(int i=0; i<MAXSPDARR; i++)
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{
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if(spdarr[i] != -1)
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{
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ssum += spdarr[i];
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cnt++;
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}
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}
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ssum /= cnt;
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return ssum;
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}
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int meanvalbps(int v)
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{
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static int f = 5;
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if (f)
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{
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f--;
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for (int i = 0; i < MAXSPDARR; i++) spdarrbps[i] = -1;
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}
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for (int i = (MAXSPDARR - 1); i > 0; i--)
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spdarrbps[i] = spdarrbps[i - 1];
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spdarrbps[0] = v;
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int ssum = 0;
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int cnt = 0;
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for (int i = 0; i < MAXSPDARR; i++)
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{
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if (spdarrbps[i] != -1)
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{
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ssum += spdarrbps[i];
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cnt++;
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}
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}
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ssum /= cnt;
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return ssum;
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}
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// len ... number of symbols
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// measures and calculates the speed in bit / s
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void measure_speed_syms(int len)
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{
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static int lasttim = 0;
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static int elems = 0;
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int tim = getus();
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int timespan = tim - lasttim;
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if(timespan < 0)
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{
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lasttim = tim;
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return;
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}
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elems += len;
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if(timespan < 1000000) return;
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double dspd = elems;
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dspd = dspd * 1e6 / timespan;
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speed = meanval((int)dspd) * bitsPerSymbol;
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// here we have number of elements after 1s
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//printf("%d sym/s\n",speed);
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// do NOT uncomment this function for RX, it is used to measure the speed for the GUI
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elems=0;
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lasttim = tim;
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}
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void measure_speed_bps(int len)
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{
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static int lasttim = 0;
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static int elems = 0;
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int tim = getus();
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int timespan = tim - lasttim;
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if (timespan < 0)
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{
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lasttim = tim;
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return;
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}
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elems += len;
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if (timespan < 1000000) return;
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double dspd = elems;
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dspd = dspd * 1e6 / timespan;
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speed = meanvalbps((int)dspd);
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// here we have number of elements after 1s
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//printf(" ======================= %d bit/s\n", speed);
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elems = 0;
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lasttim = tim;
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}
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