Mirror/Momentum-Firmware
1
0
Fork 0
mirror of https://github.com/Next-Flip/Momentum-Firmware.git synced 2026-04-24 03:29:57 -07:00
Code Issues Packages Projects Releases Wiki Activity

Message structure

Browse Source
This commit is contained in:
Max Lapan
2022-11-20 10:51:13 +01:00
parent 4c092c8e6f
commit 0bc197baae
1 changed files with 40 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

73
lib/subghz/protocols/pocsag.c
View File

@@ -16,6 +16,11 @@ static const SubGhzBlockConst pocsag_const = {
// Minimal amount of sync bits (interleaving zeros and ones)
#define POCSAG_MIN_SYNC_BITS 32
#define MASK_32_BITS 0xFFFFFFFF
#define POCSAG_FRAME_SYNC_CODE 0x7CD215D8
#define POCSAG_IDLE_CODE_WORD 0x7A89C197
struct SubGhzProtocolDecoderPocsag {
SubGhzProtocolDecoderBase base;
@@ -91,39 +96,41 @@ void subghz_protocol_decoder_pocsag_feed(void* context, bool level, uint32_t dur
return;
}
if (level)
FURI_LOG_I(TAG, "1 * %d", bits_count);
else
FURI_LOG_I(TAG, "0 * %d", bits_count);
//
// // as we found sync bits of 32 bits (in fact it is longer), we have to do proper decoding
// // of 1200-bod signal. As it could be any sequence of 1s and 0s, duration might be the
// // multiple of 833 us
// while (true) {
// // signal is too short, but not shorter than delta - something is wrong, reset
//// if (duration < pocsag_const.te_short &&
//// DURATION_DIFF(duration, pocsag_const.te_short) > pocsag_const.te_delta)
//// {
//// subghz_protocol_decoder_pocsag_reset(context);
//// return;
//// }
//
// subghz_protocol_blocks_add_bit(&instance->decoder, !level);
//
// // new bit arrived, update the decoding state machine
// switch(instance->decoder.parser_step) {
// case PocsagDecoderStepFoundSync:
// if (instance->decoder.decode_count_bit == 64) {
// FURI_LOG_I(TAG, "%" PRIx64, instance->decoder.decode_data);
// instance->decoder.decode_count_bit = 0;
// }
// break;
// }
//
// if (duration < pocsag_const.te_short)
// break;
// duration -= pocsag_const.te_short;
// }
// handle state machine for every incoming bit
while (bits_count-- > 0) {
subghz_protocol_blocks_add_bit(&instance->decoder, !level);
switch(instance->decoder.parser_step) {
case PocsagDecoderStepFoundSync:
if ((instance->decoder.decode_data & MASK_32_BITS) == POCSAG_FRAME_SYNC_CODE) {
FURI_LOG_I(TAG, "Found preamble!");
instance->decoder.parser_step = PocsagDecoderStepFoundPreamble;
instance->decoder.decode_count_bit = 0;
instance->decoder.decode_data = 0UL;
}
break;
case PocsagDecoderStepFoundPreamble:
// handle codewords
if (instance->decoder.decode_count_bit == 32) {
switch (instance->decoder.decode_data & MASK_32_BITS) {
case POCSAG_IDLE_CODE_WORD:
case POCSAG_FRAME_SYNC_CODE:
break;
default:
if (instance->decoder.decode_data >> 31 == 0) {
FURI_LOG_I(TAG, "Address code word");
}
else {
FURI_LOG_I(TAG, "Message code word");
}
}
instance->decoder.decode_count_bit = 0;
instance->decoder.decode_data = 0UL;
}
break;
}
}
}
const SubGhzProtocolDecoder subghz_protocol_pocsag_decoder = {