tom dunigan / Mbed 2 deprecated fastCRCperf

performance test of FastCRC lib, compare hardware CRC with Arduino software CRC (crc16.h) and table driven implementation

Dependencies:   FastCRC mbed

performance test of FastCRC lib, ref https://github.com/FrankBoesing/FastCRC

                 Teensy 3.2 @120MHz                                mbed K64F @120MHz
      hardware CRC	                                         hardware CRC
    Maxim (iButton) FastCRC: Value:0xF6, Time: 275 us.	       Maxim (iButton) FastCRC: Value:0xf6, Time: 275 us
    Maxim (iButton) builtin: Value:0xF6, Time: 9994 us.	       Maxim (iButton) builtin: Value:0xf6, Time: 7100 us
    MODBUS FastCRC: Value:0x7029, Time: 275 us.	               MODBUS FastCRC: Value:0x7029, Time: 275 us
    MODBUS builtin: Value:0x7029, Time: 9584 us.	       MODBUS builtin: Value:0x7029, Time: 7100 us
    XMODEM FastCRC: Value:0x98D9, Time: 275 us.	               XMODEM FastCRC: Value:0x98d9, Time: 275 us
    XMODEM builtin: Value:0x98D9, Time: 10542 us.	       XMODEM builtin: Value:0x98d9, Time: 8193 us
    MCRF4XX FastCRC: Value:0x4A29, Time: 275 us.	       MCRF4XX FastCRC: Value:0x4a29, Time: 275 us
    MCRF4XX builtin: Value:0x4A29, Time: 1783 us.	       MCRF4XX builtin: Value:0x4a29, Time: 1639 us
    KERMIT FastCRC: Value:0xB259, Time: 279 us.	               KERMIT FastCRC: Value:0xb259, Time: 275 us
    Ethernet FastCRC: Value:0x1271457F, Time: 275 us.	       Ethernet FastCRC: Value:0x1271457f, Time: 275 us
	
      table-driven CRC	                                         table-driven CRC
    Maxim (iButton) FastCRC: Value:0xF6, Time: 1329 us.	       Maxim (iButton) FastCRC: Value:0xf6, Time: 997 us
    Maxim (iButton) builtin: Value:0xF6, Time: 9994 us.	       Maxim (iButton) builtin: Value:0xf6, Time: 7101 us
    MODBUS FastCRC: Value:0x7029, Time: 2226 us.	       MODBUS FastCRC: Value:0x7029, Time: 1623 us
    MODBUS builtin: Value:0x7029, Time: 9584 us.	       MODBUS builtin: Value:0x7029, Time: 7101 us
    XMODEM FastCRC: Value:0x98D9, Time: 2102 us.	       XMODEM FastCRC: Value:0x98d9, Time: 1608 us
    XMODEM builtin: Value:0x98D9, Time: 10542 us.	       XMODEM builtin: Value:0x98d9, Time: 8193 us
    MCRF4XX FastCRC: Value:0x4A29, Time: 2185 us.	       MCRF4XX FastCRC: Value:0x4a29, Time: 1664 us
    MCRF4XX builtin: Value:0x4A29, Time: 1782 us.	       MCRF4XX builtin: Value:0x4a29, Time: 1639 us
    KERMIT FastCRC: Value:0xB259, Time: 2190 us.	       KERMIT FastCRC: Value:0xb259, Time: 1650 us
    Ethernet FastCRC: Value:0x38D32145, Time: 2090 us.	       Ethernet FastCRC: Value:0x38d32145, Time: 1702 us

Diff: main.cpp

Revision:
1:66996d5c4b7c
Parent:
0:d4f8f8fee9db
--- a/main.cpp	Fri Apr 22 09:55:23 2016 +0000
+++ b/main.cpp	Sat Apr 23 14:22:56 2016 +0000
@@ -20,6 +20,54 @@
 
 uint8_t buf[BUFSIZE] __attribute__((aligned(4)));
 
+// validation
+void printva(char * name, uint32_t check, uint32_t val){
+    printf("%s",name);
+    if (check == val)
+        printf(" is ok");
+    else
+        printf(" is NOT ok");
+    printf("\n");
+}
+
+void validate() {
+    uint32_t crc;
+    uint8_t buf[9] = {'1','2','3','4','5','6','7','8','9'};
+
+
+  printf("CRC Validation\n");
+
+  crc = CRC8.smbus(buf, sizeof(buf));
+  printva("SMBUS", 0xf4, crc);
+
+  crc = CRC8.maxim(buf, sizeof(buf));
+  printva("Maxim", 0xa1, crc);
+
+  crc = CRC16.ccitt(buf, sizeof(buf));
+  printva("CCITT", 0x29b1, crc);
+
+  crc = CRC16.mcrf4xx(buf, sizeof(buf));
+  printva("MCRF4XX", 0x6f91, crc);
+
+  crc = CRC16.modbus(buf, sizeof(buf));
+  printva("MODBUS", 0x4b37, crc);
+
+  crc = CRC16.kermit(buf, sizeof(buf));
+  printva("KERMIT", 0x2189, crc);
+
+  crc = CRC16.xmodem(buf, sizeof(buf));
+  printva("XMODEM", 0x31c3, crc);
+
+  crc = CRC16.x25(buf, sizeof(buf));
+  printva("X.25", 0x906e, crc);
+
+  crc = CRC32.crc32(buf, sizeof(buf));
+  printva("CRC32", 0xcbf43926, crc);
+
+  crc = CRC32.cksum(buf, sizeof(buf));
+  printva("CKSUM", 0x765e7680, crc);
+}
+
 
 // Supporting functions for Software CRC
 
@@ -62,7 +110,8 @@
 
   tmr.start();
   printf("\nSystemCoreClock %d %s %s\n",SystemCoreClock,__TIME__,__DATE__);
-  printf("CRC Benchmark %d bytes\n",sizeof(buf));
+  validate();
+  printf("\nCRC Benchmark %d bytes\n",sizeof(buf));
 
   //Fill array with data
   for (int i=0; i<BUFSIZE; i++) {