mwalbeck/rtl_433
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Fix TPMS Elantra2012 for longer desync (closes )

Browse source 
Co-authored-by: Bruno OCTAU <62882637+ProfBoc75@users.noreply.github.com>
Co-authored-by: MiddleSiggy <MiddleSiggy@users.noreply.github.com>
This commit is contained in:
Christian W. Zuckschwerdt 2024-02-01 09:33:50 +01:00
parent 0ae39cc5f2
commit 98b4b7c04b
1 changed files with 12 additions and 18 deletions

30
src/devices/tpms_elantra2012.c
View file

@ -8,6 +8,9 @@
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
*/
#include "decoder.h"
/**
FSK 8 byte Manchester encoded TPMS with CRC8 checksum.
Seen on Hyundai Elantra, Honda Civic.
@ -47,36 +50,27 @@ Preamble is 111 0001 0101 0101 (0x7155).
*/
#include "decoder.h"
static int tpms_elantra2012_decode(r_device *decoder, bitbuffer_t *bitbuffer, unsigned row, unsigned bitpos)
{
bitbuffer_t packet_bits = {0};
uint8_t *b;
uint32_t id;
int flags;
int pressure_kpa;
int temperature_c;
int triggered, battery_low, storage;
bitbuffer_manchester_decode(bitbuffer, row, bitpos, &packet_bits, 64);
// require 64 data bits
if (packet_bits.bits_per_row[0] < 64) {
return DECODE_ABORT_LENGTH;
}
b = packet_bits.bb[0];
uint8_t *b = packet_bits.bb[0];
if (crc8(b, 8, 0x07, 0x00)) {
return DECODE_FAIL_MIC;
}
id = ((uint32_t)b[2] << 24) | (b[3] << 16) | (b[4] << 8) | (b[5]);
flags = b[6];
pressure_kpa = b[0] + 60;
temperature_c = b[1] - 50;
storage = (b[6] & 0x04) >> 2;
battery_low = (b[6] & 0x02) >> 1;
triggered = (b[6] & 0x01) >> 0;
uint32_t id = ((uint32_t)b[2] << 24) | (b[3] << 16) | (b[4] << 8) | (b[5]);
int flags = b[6];
int pressure_kpa = b[0] + 60;
int temperature_c = b[1] - 50;
int storage = (b[6] & 0x04) >> 2;
int battery_low = (b[6] & 0x02) >> 1;
int triggered = (b[6] & 0x01) >> 0;
char id_str[9];
snprintf(id_str, sizeof(id_str), "%08x", id);
@ -150,7 +144,7 @@ r_device const tpms_elantra2012 = {
.modulation = FSK_PULSE_PCM,
.short_width = 49, // 12-13 samples @250k
.long_width = 49, // FSK
.reset_limit = 150, // Maximum gap size before End Of Message [us].
.reset_limit = 200, // Maximum gap size before End Of Message [us].
.decode_fn = &tpms_elantra2012_callback,
.fields = output_fields,
};