feat: add automatic detection of system endianess

vtx22 · Mar 9, 2025 · 51deba7 · 51deba7
1 parent 20d467c
commit 51deba7
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Showing 3 changed files with 9 additions and 4 deletions.
diff --git a/src/sparq.cpp b/src/sparq.cpp
@@ -8,6 +8,7 @@ int SPARQ::init()
 {
     std::cout << "\n=== SPARQ " << SPARQ_VERSION << " ===\n\n";
     std::cout << "Initializing ...\n\n";
+    std::cout << "System Endianess: " << (sparq_is_little_endian() ? "Little Endian" : "Big Endian") << "\n";
 
     object_init();
 

diff --git a/src/sparq_config.h b/src/sparq_config.h
@@ -9,6 +9,4 @@
 
 #define SPARQ_RECEIVE_LOOP_DELAY 1ms
 #define SPARQ_NOTIFY_DURATION_OK 3000
-#define SPARQ_NOTIFY_DURATION_ERR 5000
-
-constexpr bool SPARQ_PLATFORM_LITTLE_ENDIAN = true;
+#define SPARQ_NOTIFY_DURATION_ERR 5000
diff --git a/src/sparq_types.hpp b/src/sparq_types.hpp
@@ -17,6 +17,12 @@
 #define SPARQ_MAX_MESSAGE_LENGTH (SPARQ_MESSAGE_HEADER_LENGTH + SPARQ_MAX_PAYLOAD_LENGTH + SPARQ_CHECKSUM_LENGTH)
 #define SPARQ_DEFAULT_SIGNATURE 0xFF
 
+constexpr bool sparq_is_little_endian()
+{
+    constexpr uint32_t value = 0x01020304;
+    return reinterpret_cast<const uint8_t *>(&value)[0] == 0x04;
+}
+
 enum class sparq_header_control_t : uint8_t
 {
     LSB_FIRST = (1 << 7),
@@ -121,7 +127,7 @@ struct sparq_message_t
         uint32_t value32 = 0;
 
         bool lsb_first = header.control & (uint8_t)sparq_header_control_t::LSB_FIRST;
-        if (lsb_first == SPARQ_PLATFORM_LITTLE_ENDIAN)
+        if (lsb_first == sparq_is_little_endian())
         {
             value32 = (v3 << 24) + (v2 << 16) + (v1 << 8) + v0;
         }