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Change TPMS Renault data readings

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This commit is contained in:
Christian W. Zuckschwerdt 2018-12-21 16:48:19 +01:00
parent 27eb39ee5d
commit 36ef030bc5
1 changed files with 25 additions and 18 deletions

43
src/devices/tpms_renault.c
View file

@ -8,11 +8,12 @@
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Packet nibbles: FF PP PP II II II TT TT CC
* F = flags, (seen: c1: 22% c8: 4% c9: 10% d0: 2% d1: 29% d8: 4% d9: 29%)
* P = Pressure, 16-bit little-endian
* Packet nibbles: F F/P PP TT II II II ?? ?? CC
* F = flags, (seen: c0: 22% c8: 14% d0: 31% d8: 33%) maybe 110??T
* P = Pressure, 10 bit 0.75 kPa
* I = id, 24-bit little-endian
* T = Unknown, likely Temperature, 16-bit little-endian
* T = Temperature in C, offset -30
* ? = Unknown, mostly 0xffff
* C = Checksum, CRC-8 truncated poly 0x07 init 0x00
*/
@ -31,8 +32,9 @@ static int tpms_renault_decode(r_device *decoder, bitbuffer_t *bitbuffer, unsign
char flags_str[3];
unsigned id;
char id_str[7];
int maybe_pressure, maybe_temp;
char code_str[10];
int pressure_raw, temp_c, unknown;
double pressure_kpa;
char code_str[5];
start_pos = bitbuffer_manchester_decode(bitbuffer, row, bitpos, &packet_bits, 160);
// require 72 data bits
@ -46,24 +48,27 @@ static int tpms_renault_decode(r_device *decoder, bitbuffer_t *bitbuffer, unsign
return 0;
}
flags = b[0];
flags = b[0] >> 2;
sprintf(flags_str, "%02x", flags);
id = b[5]<<16 | b[4]<<8 | b[3]; // little-endian
sprintf(id_str, "%06x", id);
maybe_pressure = b[2]<<8 | b[1]; // little-endian
maybe_temp = b[7]<<8 | b[6]; // little-endian
sprintf(code_str, "%04x %04x", maybe_pressure, maybe_temp);
pressure_raw = (b[0] & 0x03) << 8 | b[1];
pressure_kpa = pressure_raw * 0.75;
temp_c = b[2] - 30;
unknown = b[7] << 8 | b[6]; // little-endian, fixed 0xffff?
sprintf(code_str, "%04x", unknown);
data = data_make(
"model", "", DATA_STRING, "Renault",
"type", "", DATA_STRING, "TPMS",
"id", "", DATA_STRING, id_str,
"flags", "", DATA_STRING, flags_str,
"code", "", DATA_STRING, code_str,
"mic", "", DATA_STRING, "CRC",
NULL);
"model", "", DATA_STRING, "Renault",
"type", "", DATA_STRING, "TPMS",
"id", "", DATA_STRING, id_str,
"flags", "", DATA_STRING, flags_str,
"pressure_kPa", "", DATA_FORMAT, "%.1f kPa", DATA_DOUBLE, (double)pressure_kpa,
"temperature_C", "", DATA_FORMAT, "%.0f C", DATA_DOUBLE, (double)temp_c,
"mic", "", DATA_STRING, "CRC",
NULL);
decoder_output_data(decoder, data);
return 1;
@ -92,9 +97,11 @@ static int tpms_renault_callback(r_device *decoder, bitbuffer_t *bitbuffer) {
static char *output_fields[] = {
"model",
"type"
"id",
"flags",
"code",
"pressure_kpa",
"temperature_C",
"mic",
NULL
};