Added namespace to FT8 v2
This commit is contained in:
Karlis Goba
parent
a29e1f0221
commit
41e7aef8b8
5 changed files with 137 additions and 9 deletions
5
encode.h
5
encode.h
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@ -25,4 +25,7 @@ void genft8(const uint8_t *payload, uint8_t i3, uint8_t *itone);
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// * codeword - array of 174 bits stored as 22 bytes (MSB first)
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void encode174(const uint8_t *message, uint8_t *codeword);
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uint16_t ft8_crc(uint8_t *message, int nBits);
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// Compute 12-bit CRC for a sequence of given number of bits
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// [IN] message - byte sequence (MSB first)
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// [IN] num_bits - number of bits in the sequence
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uint16_t ft8_crc(uint8_t *message, int num_bits);
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@ -1,5 +1,7 @@
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#include "encode.h"
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namespace ft8_v2 {
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constexpr int N = 174, K = 91, M = N-K; // Define the LDPC sizes
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constexpr uint16_t POLYNOMIAL = 0x2757; // CRC-14 polynomial without the leading (MSB) 1
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@ -214,10 +216,9 @@ uint16_t ft8_crc(uint8_t *message, int num_bits) {
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// Generate FT8 tone sequence from payload data
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// [IN] payload - 9 byte array consisting of 72 bit payload (MSB first)
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// [IN] i3 - 3 bits containing message type (zero?)
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// [IN] payload - 10 byte array consisting of 77 bit payload (MSB first)
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// [OUT] itone - array of NN (79) bytes to store the generated tones (encoded as 0..7)
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void genft8(const uint8_t *payload, uint8_t i3, uint8_t *itone) {
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void genft8(const uint8_t *payload, uint8_t *itone) {
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uint8_t a91[12]; // Store 77 bits of payload + 14 bits CRC
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// Copy 77 bits of payload data
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@ -261,3 +262,5 @@ void genft8(const uint8_t *payload, uint8_t i3, uint8_t *itone) {
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++k;
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}
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}
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}; // namespace
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34
encode_91.h
Normal file
34
encode_91.h
Normal file
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@ -0,0 +1,34 @@
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#pragma once
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#include <stdint.h>
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namespace ft8_v2 {
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constexpr int ND = 58; // Data symbols
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constexpr int NS = 21; // Sync symbols (3 @ Costas 7x7)
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constexpr int NN = NS+ND; // Total channel symbols (79)
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// Generate FT8 tone sequence from payload data
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// [IN] payload - 9 byte array consisting of 72 bit payload
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// [OUT] itone - array of NN (79) bytes to store the generated tones (encoded as 0..7)
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void genft8(const uint8_t *payload, uint8_t *itone);
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// Encode an 87-bit message and return a 174-bit codeword.
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// The generator matrix has dimensions (87,87).
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// The code is a (174,87) regular ldpc code with column weight 3.
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// The code was generated using the PEG algorithm.
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// After creating the codeword, the columns are re-ordered according to
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// "colorder" to make the codeword compatible with the parity-check matrix
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// Arguments:
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// * message - array of 87 bits stored as 11 bytes (MSB first)
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// * codeword - array of 174 bits stored as 22 bytes (MSB first)
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void encode174(const uint8_t *message, uint8_t *codeword);
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// Compute 14-bit CRC for a sequence of given number of bits
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// [IN] message - byte sequence (MSB first)
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// [IN] num_bits - number of bits in the sequence
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uint16_t ft8_crc(uint8_t *message, int num_bits);
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};
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86
pack_77.cpp
86
pack_77.cpp
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@ -3,6 +3,8 @@
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#include "text.h"
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namespace ft8_v2 {
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// TODO: This is wasteful, should figure out something more elegant
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const char *A0 = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?";
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const char *A1 = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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@ -33,11 +35,12 @@ int32_t pack28(const char *callsign) {
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if (starts_with(callsign, "CQ_")) {
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int nnum = 0, nlet = 0;
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// TODO:
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// if(nnum.eq.3 .and. nlet.eq.0) then n28=3+nqsy
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// if(nlet.ge.1 .and. nlet.le.4 .and. nnum.eq.0) then n28=3+1000+m
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}
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// Check for <...> callsign
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// TODO: Check for <...> callsign
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// if(c13(1:1).eq.'<')then
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// call save_hash_call(c13,n10,n12,n22) !Save callsign in hash table
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// n28=NTOKENS + n22
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@ -88,6 +91,7 @@ int32_t pack28(const char *callsign) {
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//if (length > 13) return -1;
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// TODO:
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// Treat this as a nonstandard callsign: compute its 22-bit hash
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// call save_hash_call(c13,n10,n12,n22) !Save callsign in hash table
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// n28=NTOKENS + n22
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@ -109,12 +113,15 @@ bool chkcall(const char *call, char *bc) {
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if (0 != strchr(call, '?')) return false;
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if (length > 6 && 0 != strchr(call, '/')) return false;
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// TODO: implement suffix parsing (or rework?)
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//bc=w(1:6)
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//i0=index(w,'/')
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//if(max(i0-1,n1-i0).gt.6) go to 100 !Base call must be < 7 characters
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//if(i0.ge.2 .and. i0.le.n1-1) then !Extract base call from compound call
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// if(i0-1.le.n1-i0) bc=w(i0+1:n1)//' '
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// if(i0-1.gt.n1-i0) bc=w(1:i0-1)//' '
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return true;
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}
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@ -171,6 +178,8 @@ int pack77_1(const char *msg, uint8_t *b77) {
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int32_t n28a = pack28(call1);
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int32_t n28b = pack28(call2);
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if (n28a < 0 || n28b < 0) return -1;
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uint16_t igrid4;
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@ -184,9 +193,10 @@ int pack77_1(const char *msg, uint8_t *b77) {
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igrid4 = packgrid(0);
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}
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uint8_t i3 = 1;
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uint8_t i3 = 1; // No suffix or /R
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// TODO: check for suffixes
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// if(index(w(1),'/P').ge.4 .or. index(w(2),'/P').ge.4) i3=2 !Type 2, with "/P"
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// if(index(w(1),'/P').ge.4 .or. index(w(1),'/R').ge.4) ipa=1
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// if(index(w(2),'/P').ge.4 .or. index(w(2),'/R').ge.4) ipb=1
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@ -194,9 +204,9 @@ int pack77_1(const char *msg, uint8_t *b77) {
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n28a <<= 1; // ipa = 0
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n28b <<= 1; // ipb = 0
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// Pack into (28 + 1) + (28 + 1) + (1 + 15) + 3 bits
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// write(c77,1000) n28a,ipa,n28b,ipb,ir,igrid4,i3
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// 1000 format(2(b28.28,b1),b1,b15.15,b3.3)
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// (28 + 1) + (28 + 1) + (1 + 15) + 3
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b77[0] = (n28a >> 21);
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b77[1] = (n28a >> 13);
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@ -242,11 +252,14 @@ void packtext77(const char *c13, uint8_t *b71) {
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}
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}
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int pack77(const char *msg, uint8_t *c77) {
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// Check Type 1 (Standard 77-bit message) or Type 2, with optional "/P"
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//if (starts_with(msg, "CQ ")) {
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return pack77_1(msg, c77);
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//}
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// TODO:
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// Check 0.5 (telemetry)
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// i3=0 n3=5 write(c77,1006) ntel,n3,i3 1006 format(b23.23,2b24.24,2b3.3)
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@ -257,4 +270,67 @@ int pack77(const char *msg, uint8_t *c77) {
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// i3=0 n3=0
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// packtext77(msg(1:13),c77(1:71))
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// write(c77(72:77),'(2b3.3)') n3,i3
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}
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}
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}; // namespace
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#ifdef UNIT_TEST
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#include <iostream>
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using namespace std;
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bool test1() {
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const char *inputs[] = {
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"",
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" ",
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"ABC",
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"A9",
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"L9A",
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"L7BC",
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"L0ABC",
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"LL3JG",
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"LL3AJG",
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"CQ ",
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0
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};
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for (int i = 0; inputs[i]; ++i) {
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int32_t result = ft8_v2::pack28(inputs[i]);
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printf("pack28(\"%s\") = %d\n", inputs[i], result);
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}
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return true;
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}
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bool test2() {
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const char *inputs[] = {
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"CQ LL3JG",
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"CQ LL3JG KO26",
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"L0UAA LL3JG KO26",
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"L0UAA LL3JG +02",
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"L0UAA LL3JG RRR",
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"L0UAA LL3JG 73",
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0
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};
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for (int i = 0; inputs[i]; ++i) {
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uint8_t result[10];
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int rc = ft8_v2::pack77_1(inputs[i], result);
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printf("pack77_1(\"%s\") = %d\t[", inputs[i], rc);
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for (int j = 0; j < 10; ++j) {
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printf("%02x ", result[j]);
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}
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printf("]\n");
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}
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return true;
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}
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int main() {
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test1();
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test2();
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return 0;
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}
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#endif
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12
pack_77.h
Normal file
12
pack_77.h
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@ -0,0 +1,12 @@
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#pragma once
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#include <stdint.h>
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namespace ft8_v2 {
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// Pack FT8 text message into 72 bits
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// [IN] msg - FT8 message (e.g. "CQ TE5T KN01")
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// [OUT] c77 - 10 byte array to store the 77 bit payload (MSB first)
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int pack77(const char *msg, uint8_t *c77)
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};
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