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NXDN DFA Support;

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lwvmobile
2023-03-22 20:00:41 -04:00
parent b639f6af28
commit dc49e0d08b
5 changed files with 301 additions and 114 deletions
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73
src/p25_frequency.c
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@@ -2,7 +2,7 @@
* p25_frequency.c
* P25 Channel to Frequency Calculator
*
* NXDN Channel to Frequency, Courtesy of IcomIcR20 and EricCottrell (base values)
* NXDN Channel to Frequency Calculator
*
* LWVMOBILE
* 2022-11 DSD-FME Florida Man Edition
@@ -59,16 +59,16 @@ long int process_channel_to_freq (dsd_opts * opts, dsd_state * state, int channe
}
//NXDN Channel to Frequency, Courtesy of IcomIcR20 on RR Forums
long int nxdn_channel_to_frequency(dsd_opts * opts, dsd_state * state, uint16_t channel)
{
long int freq;
long int base = 0;
long int step = 0;
//the base freq value is per EricCottrell in the Understanding NXDN Trunking Forum Thread
//will need to do some research or tests to confirm these values are accurate
//reworked to include Direct Frequency Assignment if available
//first, check channel map
//first, check channel map for imported value, DFA systems most likely won't need an import,
//unless it has 'system definable' attributes
if (state->trunk_chan_map[channel] != 0)
{
freq = state->trunk_chan_map[channel];
@@ -76,42 +76,41 @@ long int nxdn_channel_to_frequency(dsd_opts * opts, dsd_state * state, uint16_t
return (freq);
}
//then, let's see if its DFA instead -- 6.5.36
else if (state->nxdn_rcn == 1)
{
//determine the base frequency in Hz
if (state->nxdn_base_freq == 1) base = 100000000; //100 MHz
else if (state->nxdn_base_freq == 2) base = 330000000; //330 Mhz
else if (state->nxdn_base_freq == 3) base = 400000000; //400 Mhz
else if (state->nxdn_base_freq == 4) base = 750000000; //750 Mhz
else base = 0; //just set to zero, will be system definable most likely and won't be able to calc
//determine the step value in Hz
if (state->nxdn_step = 2) step = 1250; //1.25 kHz
else if (state->nxdn_step = 3) step = 3125; //3.125 kHz
else step = 0; //just set to zero, will be system definable most likely and won't be able to calc
//if we have a valid base and step, then calc frequency
//6.5.45. Outbound/Inbound Frequency Number (OFN/IFN)
if (base && step)
{
freq = base + (channel * step);
fprintf (stderr, "\n DFA Frequency [%.6lf] MHz", (double)freq/1000000);
return (freq);
}
else
{
fprintf(stderr, "\n Custom DFA Settings -- Unknown Freq;");
return (0);
}
}
else
{
fprintf(stderr, "\n Channel not found in import file");
return (0);
}
//if not found, attempt to find it via calculation
//disabled, frequency 'band plan' isn't standard
//like originally believed
// else
// {
// if ((channel > 0) && (channel <= 400))
// {
// if (opts->frame_nxdn48 == 1) base = 450000000;
// else base = 451000000;
// freq = base + (channel - 1) * 12500;
// fprintf (stderr, "\n Frequency [%.6lf] MHz", (double)freq/1000000);
// return (freq);
// }
// else if ((channel >= 401) && (channel <= 800))
// {
// if (opts->frame_nxdn48 == 1) base = 460000000;
// else base = 461000000;
// freq = base + (channel - 401) * 12500;
// fprintf (stderr, "\n Frequency [%.6lf] MHz", (double)freq/1000000);
// return (freq);
// }
// else
// {
// fprintf(stderr, "\n Non-standard frequency or channel not found in import file");
// return (0);
// }
// }
}