crc

DcPillar/Src/TCU/TCU_UpDate.c

@@ -2,6 +2,57 @@
 
 u8 TcuUpDateBuffer[1024]; //TCU升级数据缓存
 
+
+unsigned long crc32_a_opt(const unsigned char *buf, unsigned long len) 
+{
+	static unsigned long s_table[0x100] = { 0 }; 
+    unsigned long rem = 0xFFFFFFFF;
+	unsigned long b = 0;
+	unsigned long d = 0;
+	unsigned long n = 0;
+	if (s_table[1] == 0) 
+    {
+		for (n = 0; n < 0x100; n++) 
+        {
+        	s_table[n] = n << 24; 
+            for (b = 0; b < 8; b++) 
+            {
+            	d = s_table[n] & 0x80000000;
+				s_table[n] <<= 1U; 
+                if (d != 0)
+				{
+					s_table[n] ^= 0x04C11DB7; 
+                } 
+            } 
+       }     
+	} 
+	if (buf != 0 && len % 4 == 0) 
+	{
+		for (n = 0; n < len; n += 4) 
+        { 
+            rem = (rem << 8U) ^ s_table[(rem >> 24U) ^ buf[n + 3]];
+			rem = (rem << 8U) ^ s_table[(rem >> 24U) ^ buf[n + 2]];
+			rem = (rem << 8U) ^ s_table[(rem >> 24U) ^ buf[n + 1]];
+			rem = (rem << 8U) ^ s_table[(rem >> 24U) ^ buf[n + 0]]; 
+        }     
+	} 
+    return rem; 
+}
+
+u32 TCUGetPackageChecksum(void)
+{
+	unsigned long crc = 0;
+	crc = crc32_a_opt((const unsigned char *)(TcuUpDateBuffer),1024);
+	return (u32)(crc);
+}
+
+u32 TCUGetProgramChecksum(void)
+{
+	unsigned long crc = 0;
+	crc = crc32_a_opt((const unsigned char *)(BakStartAddr),480*1024);
+	return (u32)(crc);
+}
+
 void TCUUpDateHeartHandle(StructTCUSend * pPgnRecv)
 {
 	static u16 			count = 0xffff;
@@ -236,11 +287,6 @@ void TCUSendDateHandle(StructTCUSend * pPgnRecv)
 	}
 }
 
-u32 TCUGetPackageChecksum(void)
-{}
-u32 TCUGetProgramChecksum(void)
-{}
-
 typedef struct 
 {
 u8 type;//设备类型