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doc : more infos.

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Jean-François DEL NERO
2026-08-31 08:23:42 +02:00
parent 5268f9292b
commit efec4e9d21
1 changed files with 40 additions and 16 deletions
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src/pocsag/starmeteo.c
+40 -16
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@@ -26,23 +26,42 @@
///////////////////////////////////////////////////////////////////////////////////
//
// star météo protocol :
// Star Météo protocol :
//
// The Star Météo protocol was rebuilt based on multiple observations, tests
// and team discussions with multiple people (ChrisJ, Jaymore, JeffHxC, obones...)
// on the TetraHub Forum, the largest French language online community and discussion
// board dedicated to radiocommunications, radio scanning, and digital radio systems
//
// Discussion starting point : https://forum.tetrahub.net/post91796.html#p91796
//
// Note : The following description use some VHDL syntaxes for the bitfields ("X downto x")
// ----
//
// Transport :
//
// POCSAG : 466.20625MHz, FSK (+/-4.5KHz, 0:+4.5KHz, 1:-4.5KHz), 1200 Bauds, 7 bits
// RIC:25176, Alpha, Function:3
//
// Quartets Encoding :
// Valid POCSAG Alpha characters : 0x20<>0x22,0x24<>0x3F,0x41(A)<>0x5A(Z),0x6B(k)<>0x70(p),0x73(s)
//
// Valid POCSAG Alpha characters :
//
// 0x20<>0x22,
// 0x24<>0x3F
// 0x41(A)<>0x5A(Z)
// 0x6B(k)<>0x70(p)
// 0x73(s)
//
// POCSAG Alpha character (c) to 6 bits raw conversion :
// if c >= 'k' and c <= 'o' 6bitsraw = 59 + ( c - 'k' );
// if c == 'p' 6bitsraw = 0x20;
// if c == 's' 6bitsraw = 0x03;
// else 6bitsraw = c - 0x20;
// if c >= 'k' and c <= 'o' 6bitsraw = 59 + ( c - 'k' );
// if c == 'p' 6bitsraw = 0x20;
// if c == 's' 6bitsraw = 0x03;
// else 6bitsraw = c - 0x20;
//
// Quartets output :
// 2 * 6 bits raw to conversion to 3 quartets
// |543210||543210|... -> |5432|1054|3210|...
// 2 * 6 bits raw to conversion to 3 quartets
// |543210||543210|... -> |5432|1054|3210|...
//
// -------------------------------------------------------------------------------
// Time Frame :
@@ -69,20 +88,20 @@
//
// MONTH_DAY_YEAR_0,MONTH_DAY_YEAR_1,MONTH_DAY_YEAR_2 quartets encoding
//
// MONTH_DAY_YEAR_0(3 downto 2) <= (month day high BCD digit)(1 downto 0)
// MONTH_DAY_YEAR_0(1 downto 0) <= (month day low BCD digit) (3 downto 2)
// MONTH_DAY_YEAR_1(3 downto 2) <= (month day low BCD digit) (1 downto 0)
// MONTH_DAY_YEAR_1(1 downto 0) <= (year - 2000)(5 downto 4)
// MONTH_DAY_YEAR_2 <= (year - 2000)(3 downto 0)
// MONTH_DAY_YEAR_0(3 downto 2) <= (month day high BCD digit)(1 downto 0)
// MONTH_DAY_YEAR_0(1 downto 0) <= (month day low BCD digit) (3 downto 2)
// MONTH_DAY_YEAR_1(3 downto 2) <= (month day low BCD digit) (1 downto 0)
// MONTH_DAY_YEAR_1(1 downto 0) <= (year - 2000)(5 downto 4)
// MONTH_DAY_YEAR_2 <= (year - 2000)(3 downto 0)
//
// LOW_CHECKSUM quartet encoding :
//
// LOW_CHECKSUM <= 0x7 + sum of all previous quartets (from quartet [0xF] to [MONTH_DAY_YEAR_2])
// LOW_CHECKSUM <= 0x7 + sum of all previous quartets (from quartet [0xF] to [MONTH_DAY_YEAR_2])
//
// -------------------------------------------------------------------------------
// Forecasts frame
//
// | Header (6 quartets) | n+0 day_forcast (15 quartets) | n+1 day_forcast (15 quartets) | ... | n+5 day_forcast (15 quartets) | Probability of rain frame (if TYPE==0x0) |
// | Header (6 quartets) | n+0 day_forcast (15 quartets) | n+1 day_forcast (15 quartets) | ... | n+5 day_forcast (15 quartets) | Probability of rain frame (if TYPE==0x0) |
//
// ----
//
@@ -115,7 +134,6 @@
// [LOW_TEMP_HIGH_BCD][LOW_TEMP_LOW_BCD][HIGH_TEMP_HIGH_BCD][HIGH_TEMP_LOW_BCD] ...
// [PICTO_CODE_HIGH_0][PICTO_CODE_LOW_0][PICTO_CODE_HIGH_1][PICTO_CODE_LOW_1][PICTO_CODE_HIGH_2][PICTO_CODE_LOW_2][PICTO_CODE_HIGH_3][PICTO_CODE_LOW_3][PICTO_CODE_HIGH_4][PICTO_CODE_LOW_5][LOW_CHECKSUM]
//
//
// LOW_TEMP_HIGH_BCD encoding :
//
// LOW_TEMP_HIGH_BCD <= (temperature + 40) high BCD digit
@@ -132,6 +150,12 @@
// PICTO_CODE_LOW_X encoding :
//
// PICTO_CODE_LOW_X <= picto_id(3 downto 0)
//
// LOW_CHECKSUM quartet encoding :
//
// LOW_CHECKSUM <= 0x7 + sum of all previous quartets (from quartet [LOW_TEMP_HIGH_BCD] to [PICTO_CODE_LOW_5])
//
// ----
#include <errno.h>
#include <stdio.h>