WSJT-X/WsprTxScheduler.cpp

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#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <cstring>
#include <iostream>
namespace
{
char tx[6][10];
int tx_table_2hr_slot=-1, tx_table_pctx=0;
};
int tx_band_sum(char bsum[10])
{
int i,j;
for (j=0; j<10; j++) {
bsum[j]=0;
for (i=0; i<6; i++) {
bsum[j]=bsum[j]+tx[i][j];
}
}
return 1;
}
int tx_add_to_band(int band)
{
// add tx cycle to a band without regard to ntxlim
int i,islot;
for ( i=0; i<10; i++) {
islot=rand()%6;
if( tx[islot][band] != 1 ) {
tx[islot][band]=1;
return 1;
}
}
return 0;
}
int tx_sum()
{
int i,j,sum=0;
for (i=0; i<6; i++) {
for (j=0; j<10; j++) {
sum=sum+tx[i][j];
}
}
return sum;
}
int tx_add_one(char* tx)
{
int i, j, txflag, ngap;
// adds one tx slot to an existing array without
// creating successive tx slots.
// try to fill largest gaps first
// try gap sizes of 13, 11, 9, 7, 5, and finally 3
for (ngap=13; ngap>=3; ngap=ngap-2) {
for (i=0; i< 60-ngap; i++) {
txflag=0;
for (j=0; j<ngap; j++) {
if( tx[i+j]==1 )
txflag=1;
}
if( txflag == 0 ) { // found a gap of size ngap
tx[i+ngap/2]=1;
return 1;
}
}
}
// last resort - see if we can set the last slot to 1
if( tx[58]==0 && tx[59]==0 ) {
tx[59]=1;
return 1;
}
return 0;
}
int tx_trim(char* tx, int ntxlim)
{
/* ntxlim is max number of successive transmissions
* trim array so that ntxlim is not exceeded
* also make sure that first slot is never a tx slot
* this enures that we won't get a double tx because of the
* last slot of one table and the first slot of the next table
* both being tx slots.
*/
int i,nrun,sum;
if( tx[0] == 1 ) tx[0] = 0;
nrun=0;
for (i=0; i<60; i++) {
if( tx[i]==1 ) {
nrun++;
if( nrun > ntxlim ) {
tx[i]=0;
nrun=0;
}
} else {
nrun=0;
}
}
sum=0;
for (i=0; i<60; i++) {
sum=sum+tx[i];
}
return sum;
}
void tx_print()
{
int i,j;
for (i=0; i<6; i++) {
for (j=0; j<10; j++) {
if( (i*10+j)%10 == 0 && i>=0 ) printf("\n");
printf("%d ",tx[i][j]);
}
}
printf("\n");
fflush(stdout);
}
int create_tx_schedule(int pctx)
{
char bsum[10];
int i, j, k, sum, ntxlim, ntxbandmin, needed;
int iflag, nrx;
float rxavg,x;
needed=60*(pctx/100.0)+0.5;
memset(tx,0,sizeof(char)*60);
if( pctx == 0 ) return 0;
if( pctx <= 25 ) { // Use K1JT's algorithm in this regime
rxavg=100.0/pctx-1.0;
i=0;
while(1) {
x=(rand()%100)/100.0;
nrx=(rxavg+3.0*x-1.0); //2-5 for 25%
i=i+nrx+1;
if( i < 60 ) {
tx[i/10][i%10]=1;
} else {
break;
}
}
return 0;
} else if( pctx > 25 && pctx < 33 ) {
ntxlim=1;
ntxbandmin=1;
} else if( pctx >= 33 && pctx < 50 ) {
ntxlim=1;
ntxbandmin=2;
} else if( pctx >= 50 && pctx < 60 ) {
ntxlim=2;
ntxbandmin=3;
} else {
ntxlim=3;
ntxbandmin=4;
}
// when txpct>25% create a table that guarantees that all
// bands will be visited 1, 2, or 3 times, as appropriate.
//
// start by filling each band slot with ntxbandmin tx's
for (i=0; i<ntxbandmin; i++) {
for (j=0; j<10; j++) {
tx_add_to_band(j);
}
}
// trim so that no more than ntxlim successive transmissions
sum=tx_trim(*tx,ntxlim);
j=0;
iflag=0;
while (j<100 && iflag==0) {
// now backfill columns that got trimmed
tx_band_sum(bsum);
iflag=1;
for (i=0; i<10; i++) {
if( bsum[i] < ntxbandmin ) {
iflag=0;
for (k=0; k<ntxbandmin-bsum[i]; k++) {
tx_add_to_band(i);
}
}
}
sum=tx_trim(*tx,ntxlim);
j++;
}
for(j=0; j < (needed-sum); j++ ) {
tx_add_one(*tx);
}
return 0;
}
int next_tx_state(int pctx)
{
time_t now=time(0)+30;
tm *ltm = gmtime(&now);
int hour = ltm->tm_hour;
int minute = ltm->tm_min;
int tx_2hr_slot = hour/2;
int tx_20min_slot = (hour-tx_2hr_slot*2)*3 + minute/20;
int tx_2min_slot = (minute%20)/2;
if( (tx_2hr_slot != tx_table_2hr_slot) || (tx_table_pctx != pctx) ) {
create_tx_schedule(pctx);
tx_table_2hr_slot = tx_2hr_slot;
tx_table_pctx = pctx;
}
// tx_print();
return tx[tx_20min_slot][tx_2min_slot];
}
int next_hopping_band()
{
time_t now=time(0)+30;
tm *ltm = gmtime(&now);
int minute = ltm->tm_min;
int tx_2min_slot = (minute%20)/2;
return tx_2min_slot;
}