添加普冉 PY32F040 OTA 双工程代码生成模板

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-18 18:59:56 +08:00
commit 331864dc64
496 changed files with 329040 additions and 0 deletions
@@ -0,0 +1,47 @@
+#include "crc32.h"
+
+/* CRC-32/IEEE 802.3 查表实现（表在首次使用时生成，避免占用 Flash） */
+static uint32_t crc32_table[256];
+static uint8_t  crc32_table_ready = 0;
+
+static void crc32_build_table(void)
+{
+    for (uint32_t i = 0; i < 256; i++)
+    {
+        uint32_t c = i;
+        for (uint32_t k = 0; k < 8; k++)
+        {
+            c = (c & 1U) ? (0xEDB88320UL ^ (c >> 1)) : (c >> 1);
+        }
+        crc32_table[i] = c;
+    }
+    crc32_table_ready = 1;
+}
+
+uint32_t crc32_init(void)
+{
+    return 0xFFFFFFFFUL;
+}
+
+uint32_t crc32_update(uint32_t crc, const uint8_t *data, uint32_t len)
+{
+    if (!crc32_table_ready)
+    {
+        crc32_build_table();
+    }
+    while (len--)
+    {
+        crc = crc32_table[(crc ^ *data++) & 0xFFU] ^ (crc >> 8);
+    }
+    return crc;
+}
+
+uint32_t crc32_final(uint32_t crc)
+{
+    return crc ^ 0xFFFFFFFFUL;
+}
+
+uint32_t crc32_compute(const uint8_t *data, uint32_t len)
+{
+    return crc32_final(crc32_update(crc32_init(), data, len));
+}