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Support squelch in pocsag (#1415)

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* Support squelch in pocsag

* Revert smooth threshold
This commit is contained in:
Kyle Reed 2023-08-27 15:56:40 -07:00 • committed by GitHub
parent d8930db8af
commit e7e1bedcad
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 100 additions and 78 deletions
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46
firmware/common/pocsag.cpp
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@ -225,30 +225,14 @@ void pocsag_encode(const MessageType type, BCHCode& BCH_code, const uint32_t fun
} while (char_idx < message_size);
}
// -------------------------------------------------------------------------------
// Get the number of bits that differ between the two values.
// -------------------------------------------------------------------------------
inline uint8_t bitsDiff(unsigned long left, unsigned long right) {
unsigned long xord = left ^ right;
uint8_t count = 0;
for (int i = 0; i < 32; i++) {
if ((xord & 0x01) == 1) ++count;
xord = xord >> 1;
}
return (count);
// ----------------------------------------------------------------------------
// EccContainer
// ----------------------------------------------------------------------------
EccContainer::EccContainer() {
setup_ecc();
}
// -------------------------------------------------------------------------------
// -------------------------------------------------------------------------------
static uint32_t ecs[32]; /* error correction sequence */
static uint32_t bch[1025];
static int eccSetup = 0;
// -------------------------------------------------------------------------------
// -------------------------------------------------------------------------------
void setupecc() {
void EccContainer::setup_ecc() {
unsigned int srr = 0x3b4;
unsigned int i, n, j, k;
@ -311,23 +295,12 @@ void setupecc() {
}
}
// -------------------------------------------------------------------------------
// -------------------------------------------------------------------------------
inline int errorCorrection(uint32_t& val) {
// Set up the tables the first time
if (eccSetup == 0) {
setupecc();
eccSetup = 1;
}
int EccContainer::error_correct(uint32_t& val) {
int i, synd, errl, acc, pari, ecc, b1, b2;
errl = 0;
pari = 0;
/* run through error detection and correction routine */
// for (i=0; i<=20; i++)
ecc = 0;
for (i = 31; i >= 11; --i) {
if (val & (1 << i)) {
@ -336,7 +309,6 @@ inline int errorCorrection(uint32_t& val) {
}
}
// for (i=21; i<=30; i++)
acc = 0;
for (i = 10; i >= 1; --i) {
acc = acc << 1;
@ -390,8 +362,8 @@ bool pocsag_decode_batch(const POCSAGPacket& batch, POCSAGState& state) {
// Error correct twice. First time to fix any errors it can,
// second time to count number of errors that couldn't be fixed.
errorCorrection(codeword);
auto error_count = errorCorrection(codeword);
state.ecc->error_correct(codeword);
auto error_count = state.ecc->error_correct(codeword);
switch (state.mode) {
case STATE_CLEAR: