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demod_flex.c
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demod_flex.c
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/*
* demod_flex.c
*
* Copyright 2004,2006,2010 Free Software Foundation, Inc.
* Copyright (C) 2015 Craig Shelley ([email protected])
*
* Copyright (C) 2024
* Jason Lingohr ([email protected])
*
* FLEX Radio Paging Decoder - Adapted from GNURadio for use with Multimon
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
/*
* Modifications made by Ramon Smits ([email protected])
* - PR #223 Method `decode_phase` field `flex_groupmessage` moved into for, as it seems that it needs to be determined per page
* - PR #222 Suppress timestamp with argument `--flex-no-ts` which is useful when comparing output of this and future versions based on the same input file
* - PR #221 Estimate the total offset based on the estimated passed full cycles
* Modification made by bierviltje and implemented by Bruce Quinton ([email protected])
* - Issue #123 created by bierviltje (https://github.com/bierviltje) - Feature request: FLEX: put group messages in an array/list
* - This also changed the delimiter to a | rather than a space
* Version 0.9.2v (03 Apr 2019)
* Modification made by Bruce Quinton ([email protected])
* - Issue #120 created by PimHaarsma - Flex Tone-Only messages with short numeric body Bug fixed using code documented in the ticket system
* Version 0.9.1v (10 Jan 2019)
* Modification (to this file) made by Rob0101
* Fixed marking messages with K,F,C - One case had a 'C' marked as a 'K'
* Version 0.9.0v (22 May 2018)
* Modification (to this file) made by Bruce Quinton ([email protected])
* - Addded Define at top of file to modify the way missed group messages are reported in the debug output (default is 1; report missed capcodes on the same line)
* REPORT_GROUP_CODES 1 // Report each cleared faulty group capcode : 0 = Each on a new line; 1 = All on the same line;
* Version 0.8.9 (20 Mar 2018)
* Modification (to this file) made by Bruce Quinton ([email protected])
* - Issue #101 created by bertinhollan (https://github.com/bertinholland): Bug flex: Wrong split up group message after a data corruption frame.
* - Added logic to the FIW decoding that checks for any 'Group Messages' and if the frame has past them remove the group message and log output
* - The following settings (at the top of this file, just under these comments) have changed from:
* PHASE_LOCKED_RATE 0.150
* PHASE_UNLOCKED_RATE 0.150
* these new settings appear to work better when attempting to locate the Sync lock in the message preamble.
* Version 0.8.8v (20 APR 2018)
* Modification (to this file) made by Bruce Quinton ([email protected])
* - Issue #101 created by bertinhollan (https://github.com/bertinholland): Bug flex: Wrong split up group message after a data corruption frame.
* Version 0.8.7v (11 APR 2018)
* Modification (to this file) made by Bruce Quinton ([email protected]) and Rob0101 (as seen on github: https://github.com/rob0101)
* - Issue *#95 created by rob0101: '-a FLEX dropping first character of some message on regular basis'
* - Implemented Rob0101's suggestion of K, F and C flags to indicate the message fragmentation:
* 'K' message is complete and O'K' to display to the world.
* 'F' message is a 'F'ragment and needs a 'C'ontinuation message to complete it. Message = Fragment + Continuation
* 'C' message is a 'C'ontinuation of another fragmented message
* Version 0.8.6v (18 Dec 2017)
* Modification (to this file) made by Bruce Quinton ([email protected]) on behalf of bertinhollan (https://github.com/bertinholland)
* - Issue #87 created by bertinhollan: Reported issue is that the flex period timeout was too short and therefore some group messages were not being processed correctly
* After some testing bertinhollan found that increasing the timeout period fixed the issue in his area. I have done further testing in my local
* area and found the change has not reduced my success rate. I think the timeout is a localisation setting and I have added "DEMOD_TIMEOUT"
* to the definitions in the top of this file (the default value is 100 bertinhollan's prefered value, changed up from 50)
* Version 0.8.5v (08 Sep 2017)
* Modification made by Bruce Quinton ([email protected])
* - Issue #78 - Found a problem in the length detection sequence, modified the if statement to ensure the message length is
* only checked for Aplha messages, the other types calculate thier length while decoding
* Version 0.8.4v (05 Sep 2017)
* Modification made by Bruce Quinton ([email protected])
* - Found a bug in the code that was not handling multiple group messages within the same frame,
* and the long address bit was being miss treated in the same cases. Both issue have been fixed but further testing will help.
* Version 0.8.3v (22 Jun 2017)
* Modification made by Bruce Quinton ([email protected])
* - I had previously tagged Group Messages as GPN message types,
* this was my own identification rather than a Flex standard type.
* Now that I have cleaned up all identified (so far) issues I have changed back to the correct Flex message type of ALN (Alpha).
* Version 0.8.2v (21 Jun 2017)
* Modification made by Bruce Quinton ([email protected])
* - Fixed group messaging capcode issue - modified the Capcode Array to be int64_t rather than int (I was incorrectly casting the long to an int)
* Version 0.8.1v (16 Jun 2017)
* Modification made by Bruce Quinton ([email protected])
* - Added Debugging to help track the group messaging issues
* - Improved Alpha output and removed several loops to improve CPU cycles
* Version 0.8v (08 Jun 2017)
* Modification made by Bruce Quinton ([email protected])
* - Added Group Messaging
* - Fixed Phase adjustments (phasing as part of Symbol identification)
* - Fixed Alpha numeric length adjustments to stop "Invalid Vector" errors
* - Fixed numeric message treatment
* - Fixed invalid identification of "unknown" messages
* - Added 3200 2 fsk identification to all more message types to be processed (this was a big deal for NZ)
* - Changed uint to int variables
*
*/
/* ---------------------------------------------------------------------- */
#include "multimon.h"
#include "filter.h"
#include "BCHCode.h"
#include <math.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include "cJSON.h"
/* ---------------------------------------------------------------------- */
#define FREQ_SAMP 22050
#define FILTLEN 1
#define REPORT_GROUP_CODES 1 // Report each cleared faulty group capcode : 0 = Each on a new line; 1 = All on the same line;
#define FLEX_SYNC_MARKER 0xA6C6AAAAul // Synchronisation code marker for FLEX
#define SLICE_THRESHOLD 0.667 // For 4 level code, levels 0 and 3 have 3 times the amplitude of levels 1 and 2, so quantise at 2/3
#define DC_OFFSET_FILTER 0.010 // DC Offset removal IIR filter response (seconds)
#define PHASE_LOCKED_RATE 0.045 // Correction factor for locked state
#define PHASE_UNLOCKED_RATE 0.050 // Correction factor for unlocked state
#define LOCK_LEN 24 // Number of symbols to check for phase locking (max 32)
#define IDLE_THRESHOLD 0 // Number of idle codewords allowed in data section
#define CAPCODES_INDEX 0
#define DEMOD_TIMEOUT 100 // Maximum number of periods with no zero crossings before we decide that the system is not longer within a Timing lock.
int flex_disable_timestamp = 0;
enum Flex_PageTypeEnum {
FLEX_PAGETYPE_SECURE,
FLEX_PAGETYPE_SHORT_INSTRUCTION,
FLEX_PAGETYPE_TONE,
FLEX_PAGETYPE_STANDARD_NUMERIC,
FLEX_PAGETYPE_SPECIAL_NUMERIC,
FLEX_PAGETYPE_ALPHANUMERIC,
FLEX_PAGETYPE_BINARY,
FLEX_PAGETYPE_NUMBERED_NUMERIC
};
enum Flex_StateEnum {
FLEX_STATE_SYNC1,
FLEX_STATE_FIW,
FLEX_STATE_SYNC2,
FLEX_STATE_DATA
};
struct Flex_Demodulator {
unsigned int sample_freq;
double sample_last;
int locked;
int phase;
unsigned int sample_count;
unsigned int symbol_count;
double envelope_sum;
int envelope_count;
uint64_t lock_buf;
int symcount[4];
int timeout;
int nonconsec;
unsigned int baud; // Current baud rate
};
struct Flex_GroupHandler {
int64_t GroupCodes[17][1000];
int GroupCycle[17];
int GroupFrame[17];
};
struct Flex_Modulation {
double symbol_rate;
double envelope;
double zero;
};
struct Flex_State {
unsigned int sync2_count;
unsigned int data_count;
unsigned int fiwcount;
enum Flex_StateEnum Current;
enum Flex_StateEnum Previous;
};
struct Flex_Sync {
unsigned int sync; // Outer synchronization code
unsigned int baud; // Baudrate of SYNC2 and DATA
unsigned int levels; // FSK encoding of SYNC2 and DATA
unsigned int polarity; // 0=Positive (Normal) 1=Negative (Inverted)
uint64_t syncbuf;
};
struct Flex_FIW {
unsigned int rawdata;
unsigned int checksum;
unsigned int cycleno;
unsigned int frameno;
unsigned int fix3;
};
struct Flex_Phase {
unsigned int buf[88];
int idle_count;
};
struct Flex_Data {
int phase_toggle;
unsigned int data_bit_counter;
struct Flex_Phase PhaseA;
struct Flex_Phase PhaseB;
struct Flex_Phase PhaseC;
struct Flex_Phase PhaseD;
};
struct Flex_Decode {
enum Flex_PageTypeEnum type;
int long_address;
int64_t capcode;
struct BCHCode * BCHCode;
};
struct Flex {
struct Flex_Demodulator Demodulator;
struct Flex_Modulation Modulation;
struct Flex_State State;
struct Flex_Sync Sync;
struct Flex_FIW FIW;
struct Flex_Data Data;
struct Flex_Decode Decode;
struct Flex_GroupHandler GroupHandler;
};
extern int json_mode;
static int is_alphanumeric_page(struct Flex * flex) {
if (flex==NULL) return 0;
return (flex->Decode.type == FLEX_PAGETYPE_ALPHANUMERIC ||
flex->Decode.type == FLEX_PAGETYPE_SECURE);
}
static int is_numeric_page(struct Flex * flex) {
if (flex==NULL) return 0;
return (flex->Decode.type == FLEX_PAGETYPE_STANDARD_NUMERIC ||
flex->Decode.type == FLEX_PAGETYPE_SPECIAL_NUMERIC ||
flex->Decode.type == FLEX_PAGETYPE_NUMBERED_NUMERIC);
}
static int is_tone_page(struct Flex * flex) {
if (flex==NULL) return 0;
return (flex->Decode.type == FLEX_PAGETYPE_TONE);
}
static unsigned int count_bits(struct Flex * flex, unsigned int data) {
if (flex==NULL) return 0;
#ifdef USE_BUILTIN_POPCOUNT
return __builtin_popcount(data);
#else
unsigned int n = (data >> 1) & 0x77777777;
data = data - n;
n = (n >> 1) & 0x77777777;
data = data - n;
n = (n >> 1) & 0x77777777;
data = data - n;
data = (data + (data >> 4)) & 0x0f0f0f0f;
data = data * 0x01010101;
return data >> 24;
#endif
}
static int bch3121_fix_errors(struct Flex * flex, uint32_t * data_to_fix, char PhaseNo) {
if (flex==NULL) return -1;
int i=0;
int recd[31];
/*Convert the data pattern into an array of coefficients*/
unsigned int data=*data_to_fix;
for (i=0; i<31; i++) {
recd[i] = (data>>30)&1;
data<<=1;
}
/*Decode and correct the coefficients*/
int decode_error=BCHCode_Decode(flex->Decode.BCHCode, recd);
/*Decode successful?*/
if (!decode_error) {
/*Convert the coefficient array back to a bit pattern*/
data=0;
for (i=0; i<31; i++) {
data<<=1;
data|=recd[i];
}
/*Count the number of fixed errors*/
int fixed=count_bits(flex, (*data_to_fix & 0x7FFFFFFF) ^ data);
if (fixed>0) {
verbprintf(3, "FLEX: Phase %c Fixed %i errors @ 0x%08x (0x%08x -> 0x%08x)\n", PhaseNo, fixed, (*data_to_fix&0x7FFFFFFF) ^ data, (*data_to_fix&0x7FFFFFFF), data );
}
/*Write the fixed data back to the caller*/
*data_to_fix=data;
} else {
verbprintf(3, "FLEX: Phase %c Data corruption - Unable to fix errors.\n", PhaseNo);
}
return decode_error;
}
static unsigned int flex_sync_check(struct Flex * flex, uint64_t buf) {
if (flex==NULL) return 0;
// 64-bit FLEX sync code:
// AAAA:BBBBBBBB:CCCC
//
// Where BBBBBBBB is always 0xA6C6AAAA
// and AAAA^CCCC is 0xFFFF
//
// Specific values of AAAA determine what bps and encoding the
// packet is beyond the frame information word
//
// First we match on the marker field with a hamming distance < 4
// Then we match on the outer code with a hamming distance < 4
unsigned int marker = (buf & 0x0000FFFFFFFF0000ULL) >> 16;
unsigned short codehigh = (buf & 0xFFFF000000000000ULL) >> 48;
unsigned short codelow = ~(buf & 0x000000000000FFFFULL);
int retval=0;
if (count_bits(flex, marker ^ FLEX_SYNC_MARKER) < 4 && count_bits(flex, codelow ^ codehigh) < 4 ) {
retval=codehigh;
} else {
retval=0;
}
return retval;
}
static unsigned int flex_sync(struct Flex * flex, unsigned char sym) {
if (flex==NULL) return 0;
int retval=0;
flex->Sync.syncbuf = (flex->Sync.syncbuf << 1) | ((sym < 2)?1:0);
retval=flex_sync_check(flex, flex->Sync.syncbuf);
if (retval!=0) {
flex->Sync.polarity=0;
} else {
/*If a positive sync pattern was not found, look for a negative (inverted) one*/
retval=flex_sync_check(flex, ~flex->Sync.syncbuf);
if (retval!=0) {
flex->Sync.polarity=1;
}
}
return retval;
}
static void decode_mode(struct Flex * flex, unsigned int sync_code) {
if (flex==NULL) return;
struct {
int sync;
unsigned int baud;
unsigned int levels;
} flex_modes[] = {
{ 0x870C, 1600, 2 },
{ 0xB068, 1600, 4 },
{ 0x7B18, 3200, 2 },
{ 0xDEA0, 3200, 4 },
{ 0x4C7C, 3200, 4 },
{0,0,0}
};
int x=0;
int i=0;
for (i=0; flex_modes[i].sync!=0; i++) {
if (count_bits(flex, flex_modes[i].sync ^ sync_code) < 4) {
flex->Sync.sync = sync_code;
flex->Sync.baud = flex_modes[i].baud;
flex->Sync.levels = flex_modes[i].levels;
x = 1;
break;
}
}
if(x==0){
verbprintf(3, "FLEX: Sync Code not found, defaulting to 1600bps 2FSK\n");
}
}
static void read_2fsk(struct Flex * flex, unsigned int sym, unsigned int * dat) {
if (flex==NULL) return;
*dat = (*dat >> 1) | ((sym > 1)?0x80000000:0);
}
int estimatedPassedHourlySeconds = 0;
int lastTimeseconds = -1;
static int decode_fiw(struct Flex * flex) {
if (flex==NULL) return -1;
unsigned int fiw = flex->FIW.rawdata;
int decode_error = bch3121_fix_errors(flex, &fiw, 'F');
if (decode_error) {
verbprintf(3, "FLEX: Unable to decode FIW, too much data corruption\n");
return 1;
}
// The only relevant bits in the FIW word for the purpose of this function
// are those masked by 0x001FFFFF.
flex->FIW.checksum = fiw & 0xF;
flex->FIW.cycleno = (fiw >> 4) & 0xF;
flex->FIW.frameno = (fiw >> 8) & 0x7F;
flex->FIW.fix3 = (fiw >> 15) & 0x3F;
unsigned int checksum = (fiw & 0xF);
checksum += ((fiw >> 4) & 0xF);
checksum += ((fiw >> 8) & 0xF);
checksum += ((fiw >> 12) & 0xF);
checksum += ((fiw >> 16) & 0xF);
checksum += ((fiw >> 20) & 0x01);
checksum &= 0xF;
if (checksum == 0xF) {
int timeseconds = flex->FIW.cycleno*4*60 + flex->FIW.frameno*4*60/128;
if(lastTimeseconds == -1) // Initialize
{
// Estimate the offset based on first detected frame, calculate hour offset of first frame
estimatedPassedHourlySeconds -= timeseconds;
}
bool isHourlyRollover = lastTimeseconds > timeseconds;
lastTimeseconds = timeseconds;
if(isHourlyRollover) estimatedPassedHourlySeconds += 3600;
int estimatedOffset = estimatedPassedHourlySeconds + timeseconds;
int seconds = estimatedOffset;
int days = seconds/86400; seconds -= 86400*days;
int hours = seconds/3600; seconds -= 3600*hours;
int minutes = seconds/60; seconds -= 60*minutes;
verbprintf(2, "FLEX: FrameInfoWord: cycleno=%02i frameno=%03i fix3=0x%02x time=%02i:%02i offset=%i.%02i:%02i:%02i\n",
flex->FIW.cycleno,
flex->FIW.frameno,
flex->FIW.fix3,
timeseconds/60,
timeseconds%60,
days,
hours,
minutes,
seconds
);
// Lets check the FrameNo against the expected group message frames, if we have 'Missed a group message' tell the user and clear the Cap Codes
for(int g = 0; g < 17 ;g++)
{
// Do we have a group message pending for this groupbit?
if(flex->GroupHandler.GroupFrame[g] >= 0)
{
int Reset = 0;
verbprintf(4, "Flex: GroupBit %i, FrameNo: %i, Cycle No: %i target Cycle No: %i\n", g, flex->GroupHandler.GroupFrame[g], flex->GroupHandler.GroupCycle[g], (int)flex->FIW.cycleno);
// Now lets check if its expected in this frame..
if((int)flex->FIW.cycleno == flex->GroupHandler.GroupCycle[g])
{
if(flex->GroupHandler.GroupFrame[g] < (int)flex->FIW.frameno)
{
Reset = 1;
}
}
// Check if we should have sent a group message in the previous cycle
else if(flex->FIW.cycleno == 0)
{
if(flex->GroupHandler.GroupCycle[g] == 15)
{
Reset = 1;
}
}
// If we are waiting for the cycle to roll over then move onto the next for loop item
else if(flex->FIW.cycleno == 15 && flex->GroupHandler.GroupCycle[g] == 0)
{
continue;
}
// Otherwise if the target cycle is less than the current cycle, reset the data
else if(flex->GroupHandler.GroupCycle[g] < (int)flex->FIW.cycleno)
{
Reset = 1;
}
if(Reset == 1)
{
int endpoint = flex->GroupHandler.GroupCodes[g][CAPCODES_INDEX];
if(REPORT_GROUP_CODES > 0)
{
verbprintf(3,"FLEX: Group messages seem to have been missed; Groupbit: %i; Total Capcodes: %i; Clearing Data; Capcodes: ", g, endpoint);
}
for(int capIndex = 1; capIndex <= endpoint; capIndex++)
{
if(REPORT_GROUP_CODES == 0)
{
verbprintf(3,"FLEX: Group messages seem to have been missed; Groupbit: %i; Clearing data; Capcode: [%09lld]\n", g, flex->GroupHandler.GroupCodes[g][capIndex]);
}
else
{
if(capIndex > 1)
{
verbprintf(3,",");
}
verbprintf(3,"[%09lld]", flex->GroupHandler.GroupCodes[g][capIndex]);
}
}
if(REPORT_GROUP_CODES > 0)
{
verbprintf(3,"\n");
}
// reset the value
flex->GroupHandler.GroupCodes[g][CAPCODES_INDEX] = 0;
flex->GroupHandler.GroupFrame[g] = -1;
flex->GroupHandler.GroupCycle[g] = -1;
}
}
}
return 0;
} else {
verbprintf(3, "FLEX: Bad Checksum 0x%x\n", checksum);
return 1;
}
}
static void parse_alphanumeric(struct Flex * flex, unsigned int * phaseptr, char PhaseNo, int mw1, int mw2, int flex_groupmessage) {
if (flex==NULL) return;
verbprintf(3, "FLEX: Parse Alpha Numeric\n");
int i;
time_t now=time(NULL);
struct tm * gmt=gmtime(&now);
// char buf[1024], *message;
char message[1024];
int currentChar = 0;
char frag_flag = '?';
cJSON *json_output = cJSON_CreateObject();
static char json_temp[100];
int frag = (phaseptr[mw1] >> 11) & 0x03;
int cont = (phaseptr[mw1] >> 0x0A) & 0x01;
if (cont == 0 && frag == 3) frag_flag = 'K'; // complete, ready to send
if (cont == 0 && frag != 3) frag_flag = 'C'; // incomplete until appended to 1 or more 'F's
if (cont == 1 ) frag_flag = 'F'; // incomplete until a 'C' fragment is appended
mw1++;
for (i = mw1; i <= mw2; i++) {
unsigned int dw = phaseptr[i];
unsigned char ch;
if (i > mw1 || frag != 0x03) {
ch = dw & 0x7F;
if (ch != 0x03) {
message[currentChar] = ch;
currentChar++;
}
}
ch = (dw >> 7) & 0x7F;
if (ch != 0x03) {
message[currentChar] = ch;
currentChar++;
}
ch = (dw >> 14) & 0x7F;
if (ch != 0x03) {
message[currentChar] = ch;
currentChar++;
}
}
message[currentChar] = '\0';
/*
verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c/%c %02i.%03i [%09lld] ALN ",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, frag_flag, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
verbprintf(0, "%s\n", message);
if(flex_groupmessage == 1) {
int groupbit = flex->Decode.capcode-2029568;
if(groupbit < 0) return;
int endpoint = flex->GroupHandler.GroupCodes[groupbit][CAPCODES_INDEX];
for(int g = 1; g <= endpoint;g++)
{
verbprintf(1, "FLEX Group message output: Groupbit: %i Total Capcodes; %i; index %i; Capcode: [%09lld]\n", groupbit, endpoint, g, flex->GroupHandler.GroupCodes[groupbit][g]);
verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c/%c %02i.%03i [%09lld] ALN ", gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, frag_flag, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->GroupHandler.GroupCodes[groupbit][g]);
verbprintf(0, "%s\n", message);
}
// reset the value
flex->GroupHandler.GroupCodes[groupbit][CAPCODES_INDEX] = 0;
flex->GroupHandler.GroupFrame[groupbit] = -1;
flex->GroupHandler.GroupCycle[groupbit] = -1;
}
*/
static char pt_out[4096] = { 0 };
int pt_offset;
if (!json_mode) {
if(flex_disable_timestamp)
{
pt_offset = sprintf(pt_out, "FLEX|%i/%i/%c/%c|%02i.%03i|%09lld",
flex->Sync.baud, flex->Sync.levels, frag_flag, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
else
{
pt_offset = sprintf(pt_out, "FLEX|%04i-%02i-%02i %02i:%02i:%02i|%i/%i/%c/%c|%02i.%03i|%09lld",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, frag_flag, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
}
else {
// Lets just always send timestamp, the user can discard
sprintf(json_temp, "%04i-%02i-%02i %02i:%02i:%02i",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
cJSON_AddStringToObject(json_output, "timestamp", json_temp);
cJSON_AddNumberToObject(json_output, "sync_baud", flex->Sync.baud);
cJSON_AddNumberToObject(json_output, "sync_level", flex->Sync.levels);
char buffer[2] = ""; // Buffer to hold the string representation of PhaseNo.
snprintf(buffer, sizeof(buffer), "%c", PhaseNo); // Convert PhaseNo into a C-string in buffer.
cJSON_AddStringToObject(json_output, "phase_number", buffer);
cJSON_AddNumberToObject(json_output, "cycle_number", flex->FIW.cycleno);
cJSON_AddNumberToObject(json_output, "frame_number", flex->FIW.frameno);
cJSON_AddNumberToObject(json_output, "capcode", flex->Decode.capcode);
}
// Implemented bierviltje code from ticket: https://github.com/EliasOenal/multimon-ng/issues/123#
if(flex_groupmessage == 1) {
int groupbit = flex->Decode.capcode-2029568;
if(groupbit < 0) return;
int endpoint = flex->GroupHandler.GroupCodes[groupbit][CAPCODES_INDEX];
for(int g = 1; g <= endpoint;g++)
{
verbprintf(1, "FLEX Group message output: Groupbit: %i Total Capcodes; %i; index %i; Capcode: [%09lld]\n", groupbit, endpoint, g, flex->GroupHandler.GroupCodes[groupbit][g]);
pt_offset += sprintf(pt_out + pt_offset, " %09lld", flex->GroupHandler.GroupCodes[groupbit][g]);
}
// reset the value
flex->GroupHandler.GroupCodes[groupbit][CAPCODES_INDEX] = 0;
flex->GroupHandler.GroupFrame[groupbit] = -1;
flex->GroupHandler.GroupCycle[groupbit] = -1;
}
if (!json_mode) {
pt_offset += sprintf(pt_out + pt_offset, "|ALN|%s", message);
verbprintf(0, "%s\n", pt_out);
}
else {
cJSON_AddStringToObject(json_output, "demod_name", "flex_alphanumeric");
cJSON_AddStringToObject(json_output, "message", message);
fprintf(stdout, "%s\n", cJSON_PrintUnformatted(json_output));
}
verbprintf(1, "Delete json_output\n");
cJSON_Delete(json_output);
}
static void parse_numeric(struct Flex * flex, unsigned int * phaseptr, char PhaseNo, int j) {
if (flex==NULL) return;
unsigned const char flex_bcd[17] = "0123456789 U -][";
int w1 = phaseptr[j] >> 7;
int w2 = w1 >> 7;
w1 = w1 & 0x7f;
w2 = (w2 & 0x07) + w1; // numeric message is 7 words max
time_t now=time(NULL);
struct tm * gmt=gmtime(&now);
cJSON *json_output = cJSON_CreateObject();
static char json_temp[100];
if (!json_mode) {
if(flex_disable_timestamp)
{
verbprintf(0, "FLEX|%i/%i/%c|%02i.%03i|[%09lld]|NUM ",
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
else {
verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c %02i.%03i [%09lld] NUM ",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
}
else {
// Lets just always send timestamp, the user can discard
sprintf(json_temp, "%04i-%02i-%02i %02i:%02i:%02i",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
cJSON_AddStringToObject(json_output, "timestamp", json_temp);
cJSON_AddNumberToObject(json_output, "sync_baud", flex->Sync.baud);
cJSON_AddNumberToObject(json_output, "sync_level", flex->Sync.levels);
char buffer[2] = ""; // Buffer to hold the string representation of PhaseNo.
snprintf(buffer, sizeof(buffer), "%c", PhaseNo); // Convert PhaseNo into a C-string in buffer.
cJSON_AddStringToObject(json_output, "phase_number", buffer);
cJSON_AddNumberToObject(json_output, "cycle_number", flex->FIW.cycleno);
cJSON_AddNumberToObject(json_output, "frame_number", flex->FIW.frameno);
cJSON_AddNumberToObject(json_output, "capcode", flex->Decode.capcode);
}
// Get first dataword from message field or from second
// vector word if long address
int dw;
if(!flex->Decode.long_address) {
dw = phaseptr[w1];
w1++;
w2++;
} else {
dw = phaseptr[j+1];
}
unsigned char digit = 0;
int count = 4;
if(flex->Decode.type == FLEX_PAGETYPE_NUMBERED_NUMERIC) {
count += 10; // Skip 10 header bits for numbered numeric pages
} else {
count += 2; // Otherwise skip 2
}
int i;
json_temp[0] = '\0';
for(i = w1; i <= w2; i++) {
int k;
for(k = 0; k < 21; k++) {
// Shift LSB from data word into digit
digit = (digit >> 1) & 0x0F;
if(dw & 0x01) {
digit ^= 0x08;
}
dw >>= 1;
if(--count == 0) {
// The following if statement removes spaces between the numbers
if(digit != 0x0C) {// Fill
if (!json_mode) {
verbprintf(0, "%c", flex_bcd[digit]);
}
else {
strncat(json_temp, (char*)&flex_bcd[digit], 1);
}
}
count = 4;
}
}
dw = phaseptr[i];
}
if (!json_mode) {
verbprintf(0, "\n");
}
else {
cJSON_AddStringToObject(json_output, "demod_name", "flex_numeric");
cJSON_AddStringToObject(json_output, "message", json_temp);
fprintf(stdout, "%s\n", cJSON_PrintUnformatted(json_output));
cJSON_Delete(json_output);
}
}
//static void parse_tone_only(struct Flex * flex, char PhaseNo) {
// if (flex==NULL) return;
// time_t now=time(NULL);
// struct tm * gmt=gmtime(&now);
// verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c %02i.%03i [%09lld] TON\n", gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
// flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
//}
static void parse_tone_only(struct Flex * flex, unsigned int * phaseptr, char PhaseNo, int j) {
if (flex==NULL) return;
unsigned const char flex_bcd[17] = "0123456789 U -][";
time_t now=time(NULL);
struct tm * gmt=gmtime(&now);
cJSON *json_output = cJSON_CreateObject();
static char json_temp[100];
if (!json_mode) {
if(flex_disable_timestamp)
{
verbprintf(0, "FLEX|%i/%i/%c|%02i.%03i|[%09lld]|TON ",
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
else
{
verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c %02i.%03i [%09lld] TON ",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
}
else {
// Lets just always send timestamp, the user can discard
sprintf(json_temp, "%04i-%02i-%02i %02i:%02i:%02i",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
cJSON_AddStringToObject(json_output, "timestamp", json_temp);
cJSON_AddNumberToObject(json_output, "sync_baud", flex->Sync.baud);
cJSON_AddNumberToObject(json_output, "sync_level", flex->Sync.levels);
char buffer[2] = ""; // Buffer to hold the string representation of PhaseNo.
snprintf(buffer, sizeof(buffer), "%c", PhaseNo); // Convert PhaseNo into a C-string in buffer.
cJSON_AddStringToObject(json_output, "phase_number", buffer);
cJSON_AddNumberToObject(json_output, "cycle_number", flex->FIW.cycleno);
cJSON_AddNumberToObject(json_output, "frame_number", flex->FIW.frameno);
cJSON_AddNumberToObject(json_output, "capcode", flex->Decode.capcode);
}
// message type
// 1=tone-only, 0=short numeric
int w1 = phaseptr[j] >> 7 & 0x03;
if(!w1)
{
unsigned char digit = 0;
int i;
json_temp[0] = '\0';
for (i=9; i<=17; i+=4)
{
digit = (phaseptr[j] >> i) & 0x0f;
if (!json_mode) {
verbprintf(0, "%c", flex_bcd[digit]);
}
else {
strncat(json_temp, (char*)&flex_bcd[digit], 1);
}
}
if(json_mode) {
cJSON_AddStringToObject(json_output, "tone", json_temp);
json_temp[0] = '\0';
}
if (flex->Decode.long_address)
{
for (i=0; i<=16; i+=4)
{
digit = (phaseptr[j+1] >> i) & 0x0f;
if (!json_mode) {
verbprintf(0, "%c", flex_bcd[digit]);
}
else {
strncat(json_temp, (char*)&flex_bcd[digit], 1);
}
}
if(json_mode) {
cJSON_AddStringToObject(json_output, "tone_long", json_temp);
}
}
}
if (!json_mode) {
verbprintf(0, "\n");
}
else {
cJSON_AddStringToObject(json_output, "demod_name", "flex_tone_only");
fprintf(stdout, "%s\n", cJSON_PrintUnformatted(json_output));
cJSON_Delete(json_output);
}
}
static void parse_unknown(struct Flex * flex, unsigned int * phaseptr, char PhaseNo, int mw1, int mw2) {
if (flex==NULL) return;
time_t now=time(NULL);
struct tm * gmt=gmtime(&now);
cJSON *json_output = cJSON_CreateObject();
static char json_temp[100];
if (!json_mode) {
if(flex_disable_timestamp)
{
verbprintf(0, "FLEX|%i/%i/%c|%02i.%03i|[%09lld]|UNK",
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
else
{
verbprintf(0, "FLEX: %04i-%02i-%02i %02i:%02i:%02i %i/%i/%c %02i.%03i [%09lld] UNK",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec,
flex->Sync.baud, flex->Sync.levels, PhaseNo, flex->FIW.cycleno, flex->FIW.frameno, flex->Decode.capcode);
}
}
else {
// Lets just always send timestamp, the user can discard
sprintf(json_temp, "%04i-%02i-%02i %02i:%02i:%02i",
gmt->tm_year+1900, gmt->tm_mon+1, gmt->tm_mday, gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
cJSON_AddStringToObject(json_output, "timestamp", json_temp);
cJSON_AddNumberToObject(json_output, "sync_baud", flex->Sync.baud);
cJSON_AddNumberToObject(json_output, "sync_level", flex->Sync.levels);
char buffer[2] = ""; // Buffer to hold the string representation of PhaseNo.
snprintf(buffer, sizeof(buffer), "%c", PhaseNo); // Convert PhaseNo into a C-string in buffer.
cJSON_AddStringToObject(json_output, "phase_number", buffer);
cJSON_AddNumberToObject(json_output, "cycle_number", flex->FIW.cycleno);
cJSON_AddNumberToObject(json_output, "frame_number", flex->FIW.frameno);
cJSON_AddNumberToObject(json_output, "capcode", flex->Decode.capcode);
}
int i;
json_temp[0] = '\0';
for (i = mw1; i <= mw2; i++) {
if (!json_mode) {
verbprintf(0, " %08x", phaseptr[i]);
}
else {
strncat(json_temp, (char*)&phaseptr[i], 1);
}
}
if (!json_mode) {
verbprintf(0, "\n");
}
else {
cJSON_AddStringToObject(json_output, "demod_name", "flex_unknown");
cJSON_AddStringToObject(json_output, "message", json_temp);
fprintf(stdout, "%s\n", cJSON_PrintUnformatted(json_output));
cJSON_Delete(json_output);
}
}
//static void parse_capcode(struct Flex * flex, uint32_t aw1, uint32_t aw2) {
static void parse_capcode(struct Flex * flex, uint32_t aw1) {
if (flex==NULL) return;
flex->Decode.long_address = (aw1 < 0x008001L) ||
(aw1 > 0x1E0000L) ||
(aw1 > 0x1E7FFEL);
///if (flex->Decode.long_address)
// flex->Decode.capcode = (int64_t)aw1+((int64_t)(aw2^0x001FFFFFul)<<15)+0x1F9000ull; // Don't ask
//else
flex->Decode.capcode = aw1-0x8000;
}
static void decode_phase(struct Flex * flex, char PhaseNo) {
if (flex==NULL) return;
uint32_t *phaseptr=NULL;
int i, j;
switch (PhaseNo) {
case 'A': phaseptr=flex->Data.PhaseA.buf; break;
case 'B': phaseptr=flex->Data.PhaseB.buf; break;
case 'C': phaseptr=flex->Data.PhaseC.buf; break;
case 'D': phaseptr=flex->Data.PhaseD.buf; break;
}
for (i=0; i<88; i++) {
int decode_error=bch3121_fix_errors(flex, &phaseptr[i], PhaseNo);
if (decode_error) {
verbprintf(3, "FLEX: Garbled message at block %i\n", i);
// If the previous frame was a short message then we need to Null out the Group Message pointer
// this issue and sugested resolution was presented by 'bertinholland'
return;
}
/*Extract just the message bits*/
phaseptr[i]&=0x001FFFFF;
}
// Block information word is the first data word in frame
uint32_t biw = phaseptr[0];
// Nothing to see here, please move along
if (biw == 0 || biw == 0x001FFFFF) {
verbprintf(3, "FLEX: Nothing to see here, please move along\n");
return;
}
// Vector start index is bits 15-10
// Address start address is bits 9-8, plus one for offset
int voffset = (biw >> 10) & 0x3f;
int aoffset = ((biw >> 8) & 0x03) + 1;
verbprintf(3, "FLEX: BlockInfoWord: (Phase %c) BIW:%08X AW:%02i-%02i (%i pages)\n", PhaseNo, biw, aoffset, voffset, voffset-aoffset);