mirror of
https://github.com/UberGuidoZ/Flipper.git
synced 2024-12-23 15:00:13 +00:00
64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/* Renault tires TPMS. Usually 443.92 Mhz FSK.
|
|
*
|
|
* Preamble + marshal-encoded bits. 9 Bytes in total if we don't
|
|
* count the preamble. */
|
|
|
|
#include "../app.h"
|
|
|
|
#define USE_TEST_VECTOR 0
|
|
static const char *test_vector =
|
|
"10101010" "10101010" "10101010" "10101001" // Preamble + sync.
|
|
|
|
/* The following is marshal encoded, so each two characters are
|
|
* actaully one bit. 01 = 1, 10 = 0. */
|
|
"010110010110" // Flags.
|
|
"10011001101010011001" // Pressure, multiply by 0.75 to obtain kpa.
|
|
// 244 kpa here.
|
|
"1010010110011010" // Temperature, subtract 30 to obtain celsius. 22C here.
|
|
"1001010101101001"
|
|
"0101100110010101"
|
|
"1001010101100110" // Tire ID. 0x7AD779 here.
|
|
"0101010101010101"
|
|
"0101010101010101" // Two FF bytes (usually). Unknown.
|
|
"0110010101010101"; // CRC8 with (poly 7, initialization 0).
|
|
|
|
static bool decode(uint8_t *bits, uint32_t numbytes, uint32_t numbits, ProtoViewMsgInfo *info) {
|
|
|
|
if (USE_TEST_VECTOR) { /* Test vector to check that decoding works. */
|
|
bitmap_set_pattern(bits,numbytes,test_vector);
|
|
numbits = strlen(test_vector);
|
|
}
|
|
|
|
if (numbits < 13*8) return false;
|
|
|
|
const char *sync_pattern = "10101010" "10101010" "10101010" "10101001";
|
|
uint64_t off = bitmap_seek_bits(bits,numbytes,0,numbits,sync_pattern);
|
|
if (off == BITMAP_SEEK_NOT_FOUND) return false;
|
|
FURI_LOG_E(TAG, "Renault TPMS preamble+sync found");
|
|
|
|
off += 32; /* Skip preamble. */
|
|
|
|
uint8_t raw[9];
|
|
uint32_t decoded =
|
|
convert_from_line_code(raw,sizeof(raw),bits,numbytes,off,
|
|
"10","01"); /* Manchester. */
|
|
FURI_LOG_E(TAG, "Renault TPMS decoded bits: %lu", decoded);
|
|
|
|
if (decoded < 8*9) return false; /* Require the full 9 bytes. */
|
|
|
|
float kpa = 0.75 *((uint32_t)((raw[0]&3)<<8) | raw[1]);
|
|
int temp = raw[2]-30;
|
|
|
|
snprintf(info->name,sizeof(info->name),"%s","Renault TPMS");
|
|
snprintf(info->raw,sizeof(info->raw),"%02X%02X%02X%02X%02X%02X%02X%02X%02X",
|
|
raw[0],raw[1],raw[2],raw[3],raw[4],raw[5],
|
|
raw[6],raw[7],raw[8]);
|
|
snprintf(info->info1,sizeof(info->info1),"Pressure %.2f kpa", (double)kpa);
|
|
snprintf(info->info2,sizeof(info->info2),"Temperature %d C", temp);
|
|
return true;
|
|
}
|
|
|
|
ProtoViewDecoder RenaultTPMSDecoder = {
|
|
"Renault TPMS", decode
|
|
};
|