Release fw 0.8.5: BT1035 I2S boot init and hardware doc alignment.

Switch BT1035 bring-up from Line-In to I2S slave (AT+AUXCFG=3, AT+I2SCFG=67) to match the ADAU1701 PCM routing, confirm 2 kΩ I2C pull-ups on R1/R16, and sync firmware docs, AGENTS rules, and the DATASHEET bundle.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/components/core/include/core/Bt1035At.hpp

@@ -37,7 +37,8 @@ namespace core {
  */
 enum class Bt1035AtCommand {
     Ping,             ///< AT — link check.
-    AuxLineIn,        ///< AT+AUXCFG=1 — wired Line-In from ADAU1701 (mandatory).
+    I2sMode,          ///< AT+AUXCFG=3 — I2S input from ADAU1701 (mandatory).
+    I2sSlave48k32,    ///< AT+I2SCFG=67 — I2S slave 48 kHz 32-bit (§5.1.4).
     PairDiscoverable, ///< AT+PAIR=1 — enter BR/EDR/BLE discoverable mode.
     PairHidden,       ///< AT+PAIR=0 — leave discoverable mode.
     A2dpStat,         ///< AT+A2DPSTAT — read A2DP link state.
@@ -83,7 +84,10 @@ enum class Bt1035AtResponseKind {
 };
 
 /** Number of commands in bootInitSequence(). */
-inline constexpr std::size_t kBt1035BootInitCommandCount = 2U;
+inline constexpr std::size_t kBt1035BootInitCommandCount = 3U;
+
+/** Feasycom programming guide §5.1.4: I2S slave, 48 kHz, 32-bit. */
+inline constexpr std::uint8_t kBt1035I2sSlave48k32Param = 67U;
 
 /**
  * @brief    buildBt1035AtLine — serialise a command with CRLF terminator.
@@ -102,7 +106,7 @@ inline constexpr std::size_t kBt1035BootInitCommandCount = 2U;
  * @brief    bootInitSequence — mandatory bring-up commands in order.
  *
  * @dname    bootInitSequence
- * @return   Ping then AuxLineIn (AT+AUXCFG=1).
+ * @return   Ping, I2sMode (AUXCFG=3), I2sSlave48k32 (I2SCFG=67).
  * @pubstate none
  *
  * @author   Michele Bigi
@@ -165,6 +169,21 @@ parseBt1035A2dpStatResponse(std::string_view response);
  */
 [[nodiscard]] std::string buildBt1035SetAutoConnLine(std::uint8_t times);
 
+/**
+ * @brief    buildBt1035SetNameLine — AT+NAME with optional MAC suffix flag.
+ *
+ * @dname    buildBt1035SetNameLine
+ * @param    name  BR/EDR local name (1--31 ASCII bytes per Feasycom §5.1.16).
+ * @param    enableMacSuffix  false sends Param2=0 (disable module suffix).
+ * @return   Full AT line including CRLF.
+ * @pubstate none
+ *
+ * @author   Michele Bigi
+ * @date     2026-07-08
+ */
+[[nodiscard]] std::string buildBt1035SetNameLine(std::string_view name,
+                                                 bool enableMacSuffix = false);
+
 /**
  * @brief    parseBt1035NameResponse — extract +NAME= value.
  *

Software/components/core/include/core/CompanionChipStatus.hpp

@@ -27,7 +27,7 @@ namespace core {
 struct CompanionChipStatus {
     bool si4684Ready;   ///< Si4684 HOST_LOAD completed.
     bool adau1701Ready; ///< ADAU1701 SigmaStudio download completed.
-    bool bt1035Ready;   ///< BT1035 Line-In init (AT+AUXCFG=1) completed.
+    bool bt1035Ready;   ///< BT1035 I2S init (AUXCFG=3 + I2SCFG=67) completed.
 };
 
 } // namespace core

Software/components/core/src/Bt1035At.cpp

@@ -101,8 +101,10 @@ std::string buildBt1035AtLine(Bt1035AtCommand command)
     switch (command) {
     case Bt1035AtCommand::Ping:
         return "AT\r\n";
-    case Bt1035AtCommand::AuxLineIn:
-        return "AT+AUXCFG=1\r\n";
+    case Bt1035AtCommand::I2sMode:
+        return "AT+AUXCFG=3\r\n";
+    case Bt1035AtCommand::I2sSlave48k32:
+        return "AT+I2SCFG=67\r\n";
     case Bt1035AtCommand::PairDiscoverable:
         return "AT+PAIR=1\r\n";
     case Bt1035AtCommand::PairHidden:
@@ -129,11 +131,21 @@ std::string buildBt1035SetAutoConnLine(std::uint8_t times)
     return "AT+AUTOCONN=" + std::to_string(times) + "\r\n";
 }
 
+std::string buildBt1035SetNameLine(std::string_view name, bool enableMacSuffix)
+{
+    if (name.empty() || name.size() > 31U) {
+        return {};
+    }
+    return std::string("AT+NAME=") + std::string(name) + ","
+           + (enableMacSuffix ? "1" : "0") + "\r\n";
+}
+
 std::array<Bt1035AtCommand, kBt1035BootInitCommandCount> bootInitSequence() noexcept
 {
     return std::array<Bt1035AtCommand, kBt1035BootInitCommandCount>{
         Bt1035AtCommand::Ping,
-        Bt1035AtCommand::AuxLineIn,
+        Bt1035AtCommand::I2sMode,
+        Bt1035AtCommand::I2sSlave48k32,
     };
 }
 

Software/components/core/test/bt1035_at_test.cpp

@@ -28,13 +28,24 @@ namespace {
         std::cerr << "init sequence size mismatch\n";
         return EXIT_FAILURE;
     }
-    if (sequence[1U] != core::Bt1035AtCommand::AuxLineIn) {
-        std::cerr << "AUXCFG=1 must be in init sequence\n";
+    if (sequence[1U] != core::Bt1035AtCommand::I2sMode) {
+        std::cerr << "I2S mode must be in init sequence\n";
         return EXIT_FAILURE;
     }
-    const std::string aux = core::buildBt1035AtLine(core::Bt1035AtCommand::AuxLineIn);
-    if (aux != "AT+AUXCFG=1\r\n") {
-        std::cerr << "AUXCFG command line mismatch\n";
+    if (sequence[2U] != core::Bt1035AtCommand::I2sSlave48k32) {
+        std::cerr << "I2SCFG must be in init sequence\n";
+        return EXIT_FAILURE;
+    }
+    const std::string i2sMode =
+        core::buildBt1035AtLine(core::Bt1035AtCommand::I2sMode);
+    if (i2sMode != "AT+AUXCFG=3\r\n") {
+        std::cerr << "AUXCFG=3 command line mismatch\n";
+        return EXIT_FAILURE;
+    }
+    const std::string i2sCfg =
+        core::buildBt1035AtLine(core::Bt1035AtCommand::I2sSlave48k32);
+    if (i2sCfg != "AT+I2SCFG=67\r\n") {
+        std::cerr << "I2SCFG=67 command line mismatch\n";
         return EXIT_FAILURE;
     }
     return EXIT_SUCCESS;
@@ -117,6 +128,11 @@ namespace {
         std::cerr << "AUTOCONN command line mismatch\n";
         return EXIT_FAILURE;
     }
+    if (core::buildBt1035SetNameLine("DigiRadio-A1B2", false)
+        != "AT+NAME=DigiRadio-A1B2,0\r\n") {
+        std::cerr << "NAME set command line mismatch\n";
+        return EXIT_FAILURE;
+    }
     return EXIT_SUCCESS;
 }