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[rtl-433.git] / src / devices / schraeder.c

diff --git a/src/devices/schraeder.c b/src/devices/schraeder.c
new file mode 100644 (file)
index 0000000..3629076
--- /dev/null
+++ b/src/devices/schraeder.c
@@ -0,0 +1,96 @@
+/* Schraeder TPMS protocol
+ *
+ * Copyright © 2016 Benjamin Larsson
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/**
+ * Packet payload: 8,5 bytes, 17 nibbles
+ *
+ *           01 23 45 67 89 AB CD EF 0
+ * [00] {68} 7f 67 03 a3 8b 20 04 94 9
+ *           SP UU UI II II IU UU UC C
+ *
+ * S = sync
+ * P = preamble (0xf)
+ * U = unknown
+ * I = id
+ * C = CRC8 from nibble 1 to E
+ */
+
+#include "rtl_433.h"
+#include "pulse_demod.h"
+#include "util.h"
+
+
+static int schraeder_callback(bitbuffer_t *bitbuffer) {
+       char time_str[LOCAL_TIME_BUFLEN];
+       bitrow_t *bb = bitbuffer->bb;
+       uint32_t serial_id = 0;
+       data_t *data;
+       char hexid[20] = {0};
+       uint8_t work_buffer[9];
+       int i;
+
+       /* Reject wrong amount of bits */
+       if ( bitbuffer->bits_per_row[0] != 68)
+               return 0;
+
+       /* shift the buffer 4 bits for the crc8 calculation */
+       for (i=0 ; i<8 ; i++)
+               work_buffer[i] = (bb[0][i]&0x0F)<<4 | (bb[0][i+1]&0xF0) >> 4;
+
+       /* Calculate the crc */
+       if (work_buffer[7] != crc8(work_buffer, 7, 0x07, 0xf0)) {
+               return 0;
+       }
+
+       local_time_str(0, time_str);
+
+       /* Get serial number id */
+       serial_id = (bb[0][2]&0x0F) << 20 | bb[0][3] << 12 | bb[0][4] << 4 | (bb[0][5]&0xF0) >> 4;
+       sprintf(hexid, "%X", serial_id);
+
+       if (debug_output >= 1) {
+               fprintf(stderr, "Schraeder TPMS decoder\n");
+               bitbuffer_print(bitbuffer);
+               fprintf(stderr, "id = 0x%X\n", serial_id);
+               fprintf(stderr, "CRC = %x\n", crc8(work_buffer, 7, 0x07, 0xf0));
+       }
+
+       data = data_make("time", "", DATA_STRING, time_str,
+                                       "model", "", DATA_STRING, "Schraeder",
+                                       "type", "", DATA_STRING, "TPMS",
+                                       "id", "ID", DATA_STRING, hexid,
+                                       "crc", "", DATA_STRING, "OK",
+                                       NULL);
+
+       data_acquired_handler(data);
+       return 0;
+}
+
+static char *output_fields[] = {
+       "time",
+       "model",
+       "id",
+       "flags",
+       "pressure",
+       "temperature_C",
+       "depth",
+       NULL
+};
+
+r_device schraeder = {
+       .name                   = "Schraeder TPMS",
+       .modulation             = OOK_PULSE_MANCHESTER_ZEROBIT,
+       .short_limit    = 30*4,
+       .long_limit     = 0,
+       .reset_limit    = 120*4,
+       .json_callback  = &schraeder_callback,
+       .disabled               = 0,
+       .fields                 = output_fields,
+};