feat: save stable CH390 bridge baseline

App/flash_param.c

@@ -19,41 +19,10 @@
  * Private Variables
  *---------------------------------------------------------------------------*/
 
-/* CRC32 lookup table */
-static uint32_t g_crc_table[256];
-static bool g_crc_table_initialized = false;
-
 /*---------------------------------------------------------------------------
  * Private Functions
  *---------------------------------------------------------------------------*/
 
-/**
- * @brief Initialize CRC32 lookup table
- */
-static void crc32_init_table(void)
-{
-    uint32_t i, j, crc;
-    
-    for (i = 0; i < 256; i++)
-    {
-        crc = i;
-        for (j = 0; j < 8; j++)
-        {
-            if (crc & 1)
-            {
-                crc = (crc >> 1) ^ CRC32_POLYNOMIAL;
-            }
-            else
-            {
-                crc >>= 1;
-            }
-        }
-        g_crc_table[i] = crc;
-    }
-    
-    g_crc_table_initialized = true;
-}
-
 /**
  * @brief Unlock Flash for writing
  */
@@ -105,12 +74,6 @@ static HAL_StatusTypeDef flash_program_halfword(uint32_t addr, uint16_t data)
  */
 int flash_param_init(void)
 {
-    /* Initialize CRC table */
-    if (!g_crc_table_initialized)
-    {
-        crc32_init_table();
-    }
-    
     return 0;
 }
 
@@ -243,16 +206,22 @@ uint32_t flash_param_crc32(const void *data, uint32_t len)
     const uint8_t *p = (const uint8_t *)data;
     uint32_t crc = 0xFFFFFFFF;
     uint32_t i;
-    
-    /* Initialize table if needed */
-    if (!g_crc_table_initialized)
-    {
-        crc32_init_table();
-    }
-    
+    uint32_t j;
+
     for (i = 0; i < len; i++)
     {
-        crc = g_crc_table[(crc ^ p[i]) & 0xFF] ^ (crc >> 8);
+        crc ^= p[i];
+        for (j = 0; j < 8u; ++j)
+        {
+            if ((crc & 1u) != 0u)
+            {
+                crc = (crc >> 1) ^ CRC32_POLYNOMIAL;
+            }
+            else
+            {
+                crc >>= 1;
+            }
+        }
     }
     
     return crc ^ 0xFFFFFFFF;