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Date/Time frame : Regions/Area ID frame support added.

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This commit is contained in:
Jean-François DEL NERO
2026-09-06 15:37:07 +02:00
parent dba04626d7
commit 804515c14f
1 changed files with 88 additions and 2 deletions
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src/pocsag/starmeteo.c
+88 -2
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@@ -108,7 +108,7 @@
//
// Warning : Most of the data in this frame/block are not aligned to the quartets.
//
// [0x0][0x0][0x0]<TRANSMISSIONS_INTERVAL (5 bits)><NUMBER_OF_AREAS (5bits)><AREAS_ID_LIST (NUMBER_OF_AREAS*7 Bits)>[RFU][HIGH_CHECKSUM][LOW_CHECKSUM][0][0]
// [0x0][0x0][0x0]<TRANSMISSIONS_INTERVAL (5 bits)><NUMBER_OF_AREAS (5 bits)><AREAS_ID_LIST (NUMBER_OF_AREAS*7 Bits)>[RFU][HIGH_CHECKSUM][LOW_CHECKSUM][0][0]
//
// TRANSMISSIONS_INTERVAL encoding :
//
@@ -154,7 +154,7 @@
//
// HEADER_BLOCK :
//
// [TYPE][AREA_ID_HIGH][AREA_ID_LOW][0x0][0x4][LOW_CHECKSUM]
// [TYPE][AREA_ID_HIGH][AREA_ID_LOW][ALERT][0x4][LOW_CHECKSUM]
//
// TYPE encoding :
// 0x4 : Forecast without the rain probability forecast
@@ -360,6 +360,33 @@ uint32_t get_field(unsigned char * quartets_array, int bitidx, int fieldsize, in
return val;
}
int set_field(unsigned char * quartets_array, int bitidx, int fieldsize, int quartets_array_size, uint32_t data)
{
int j;
uint32_t val;
val = 0;
j = 0;
while(j<fieldsize && (bitidx >> 2) < quartets_array_size )
{
val <<= 1;
if(data >> ( (fieldsize - j) -1 ) & 1 )
{
quartets_array[bitidx >> 2] |= (0x8 >> (bitidx&3));
}
else
{
quartets_array[bitidx >> 2] &= ~(0x8 >> (bitidx&3));
}
bitidx++;
j++;
}
return bitidx;
}
// Encode temperature to BCD+40
unsigned char dectemp_to_bcd(int temp)
{
@@ -419,6 +446,58 @@ int gen_current_time(unsigned char * quartets)
return 9;
}
// Generate and encode the areas ids array.
int gen_area_ids(unsigned char * quartets)
{
int i,j,bitidx;
i = 0;
quartets[i++] = 0x0;
quartets[i++] = 0x0;
quartets[i++] = 0x0;
bitidx = i << 2;
// 12 Minutes interval
bitidx = set_field(quartets, bitidx, 5, MAX_MSG_SIZE*3, 12);
// Set 8 default regions ...
bitidx = set_field(quartets, bitidx, 5, MAX_MSG_SIZE*3, 8);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 75);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 77);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 78);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 91);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 92);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 93);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 94);
bitidx = set_field(quartets, bitidx, 7, MAX_MSG_SIZE*3, 95);
// Aligment to the next quartet
if(bitidx&3)
bitidx = set_field(quartets, bitidx, (4 - (bitidx&3)), MAX_MSG_SIZE*3, 0);
i = bitidx >> 2;
quartets[i++] = 0x1; // Not sure yet about the meaning of this quartet
int sum = 0x7;
j = 0;
while(j<i)
{
sum += quartets[j];
j++;
}
quartets[i++] = (sum >> 4) & 0xF;
quartets[i++] = (sum ) & 0xF;
quartets[i++] = 0x0;
quartets[i++] = 0x0;
return i;
}
int gen_forecast(unsigned char * quartets, char * params)
{
char *tmp_ptr,*tmp2_ptr;
@@ -591,6 +670,11 @@ int main(int argc, char* argv[])
printf("Example: %s -decode ../previsions_ok/*.txt\n",argv[0]);
printf("Example: %s -curtime -quiet\n",argv[0]);
printf("Example: %s -forecast:-10,40,1,2,3,4,5 -forecast:-11,41,6,7,8,9,10 -forecast:-12,42,11,12,13,14,15 -forecast:-13,43,16,17,18,19,20 -areaid:75 -quiet\n",argv[0]);
printf("Example: starmeteo + rf-tools pocsag + hackrf :\n");
printf(" ./starmeteo -curtime -quiet | ./pocsag -generate -stdin_message -stdout -ric:25176 -func:3 -alpha | hackrf_transfer -f 466206250 -t - -x 10 -a 0 -s 2000000\n");
printf("Example: starmeteo + rpitx :\n");
printf(" ./starmeteo -quiet -curtime -rpitx | sudo pocsag -f \"466205000\" -r 1200 -t 1\n");
exit(0);
}
@@ -906,6 +990,8 @@ int main(int argc, char* argv[])
exit(-1);
genfrm->quartets_cnt = gen_current_time(genfrm->quartetfrm);
genfrm->quartets_cnt += gen_area_ids(&genfrm->quartetfrm[genfrm->quartets_cnt]);
i = 0;
while( i < genfrm->quartets_cnt )