Toyota TPMS.

protocols/toyota_tpms.c

@@ -0,0 +1,76 @@
+/* Ford tires TPMS. Usually 443.92 Mhz FSK (In Europe).
+ *
+ * Preamble + sync + 64 bits of data.
+ *
+ * The preamble + sync is something like:
+ *
+ *   10101010101 (preamble) + 001111[1] (sync)
+ *
+ * Note: the final [1] means that sometimes it is four 1s, sometimes
+ * five, depending on the short pulse length detection and the exact
+ * duration of the high long pulse. After the sync, a differential
+ * Manchester encoded payload follows. However the Flipper's CC1101
+ * often can't decode correctly the initial alternating pattern 101010101,
+ * so what we do is to seek just the sync, that is "001111" or "0011111",
+ * however we now that it must be followed by one differenitally encoded
+ * bit, so we can use also the first bit of data to force a more robust
+ * detection, and look for one of the following:
+ *
+ * [001111]00
+ * [0011111]00
+ * [001111]01
+ * [0011111]01
+ */
+
+#include "../app.h"
+
+static bool decode(uint8_t *bits, uint32_t numbytes, uint32_t numbits, ProtoViewMsgInfo *info) {
+
+    if (numbits-6 < 64*2) return false; /* Ask for 64 bit of data (each bit
+                                           is two symbols in the bitmap). */
+
+    char *sync[] = {
+        "00111100",
+        "001111100",
+        "00111101",
+        "001111101",
+        NULL
+    };
+
+    int j;
+    uint32_t off = 0;
+    for (j = 0; sync[j]; j++) {
+        off = bitmap_seek_bits(bits,numbytes,0,numbits,sync[j]);
+        if (off != BITMAP_SEEK_NOT_FOUND) {
+            off += strlen(sync[j])-2;
+            break;
+	}
+    }
+    if (off == BITMAP_SEEK_NOT_FOUND) return false;
+
+    FURI_LOG_E(TAG, "Toyota TPMS sync[%s] found", sync[j]);
+
+    uint8_t raw[8];
+    uint32_t decoded =
+        convert_from_diff_manchester(raw,sizeof(raw),bits,numbytes,off,true);
+    FURI_LOG_E(TAG, "Toyota TPMS decoded bits: %lu", decoded);
+
+    if (decoded < 64) return false; /* Require the full 8 bytes. */
+
+    float kpa = (float)((raw[4]&0x7f)<<1 | raw[5]>>7) * 0.25 - 7;
+    int temp = ((raw[5]&0x7f)<<1 | raw[6]>>7) - 40;
+
+    snprintf(info->name,sizeof(info->name),"%s","Toyota 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),"Tire ID %02X%02X%02X%02X",
+        raw[0],raw[1],raw[2],raw[3]);
+    snprintf(info->info1,sizeof(info->info1),"Pressure %.2f psi", (double)kpa);
+    snprintf(info->info2,sizeof(info->info2),"Temperature %d C", temp);
+    return true;
+}
+
+ProtoViewDecoder ToyotaTPMSDecoder = {
+    "Toyota TPMS", decode
+};

signal.c

@@ -376,11 +376,13 @@ uint32_t convert_from_diff_manchester(uint8_t *buf, uint64_t buflen, uint8_t *bi
 extern ProtoViewDecoder Oregon2Decoder;
 extern ProtoViewDecoder B4B1Decoder;
 extern ProtoViewDecoder RenaultTPMSDecoder;
+extern ProtoViewDecoder ToyotaTPMSDecoder;
 
 ProtoViewDecoder *Decoders[] = {
     &Oregon2Decoder,        /* Oregon sensors v2.1 protocol. */
     &B4B1Decoder,           /* PT, SC, ... 24 bits remotes. */
     &RenaultTPMSDecoder,    /* Renault TPMS. */
+    &ToyotaTPMSDecoder,     /* Toyota TPMS. */
     NULL
 };