Diff: main.cpp

Revision:

0:d4f8f8fee9db

Child:

1:66996d5c4b7c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Apr 22 09:55:23 2016 +0000
@@ -0,0 +1,125 @@
+// test FastCRC performance, hardware vs avr softcrc
+//FastCRC
+//Benchmark
+//
+//(c) Frank Boesing 2014
+
+#include "mbed.h"
+#include "FastCRC.h"
+#include "crc16.h"
+
+Timer tmr;
+#define micros tmr.read_us
+
+#define BUFSIZE 16384
+
+
+FastCRC8 CRC8;
+FastCRC16 CRC16;
+FastCRC32 CRC32;
+
+uint8_t buf[BUFSIZE] __attribute__((aligned(4)));
+
+
+// Supporting functions for Software CRC
+
+inline uint16_t softcrc(uint16_t seed, uint8_t *data, uint16_t datalen) {
+    for (uint16_t i=0; i<datalen; i++) {
+        seed = _crc16_update(seed,  data[i]);
+    }
+    return seed;
+}
+
+inline uint16_t softcrcIbutton(uint16_t seed, uint8_t *data, uint16_t datalen) {
+    for (uint16_t i=0; i<datalen; i++) {
+        seed = _crc_ibutton_update(seed,  data[i]);
+    }
+    return seed;
+}
+
+inline uint16_t softcrcCCIT(uint16_t seed, uint8_t *data, uint16_t datalen) {
+    for (uint16_t i=0; i<datalen; i++) {
+        seed = _crc_ccitt_update(seed,  data[i]);
+    }
+    return seed;
+}
+
+inline uint16_t softcrcXMODEM(uint16_t seed, uint8_t *data, uint16_t datalen) {
+    for (uint16_t i=0; i<datalen; i++) {
+        seed = _crc_xmodem_update(seed,  data[i]);
+    }
+    return seed;
+}
+
+
+void printVals(char * name, uint32_t crc, uint32_t time) {
+    printf("%s Value:0x%x, Time: %d us\n",name,crc,time);
+}
+
+main() {
+    uint32_t time;
+    uint32_t crc;
+
+  tmr.start();
+  printf("\nSystemCoreClock %d %s %s\n",SystemCoreClock,__TIME__,__DATE__);
+  printf("CRC Benchmark %d bytes\n",sizeof(buf));
+
+  //Fill array with data
+  for (int i=0; i<BUFSIZE; i++) {
+    buf[i] = (i+1) & 0xff;
+  }
+
+
+  time = micros();
+  crc = CRC8.maxim(buf, BUFSIZE);
+  time = micros() - time;
+  printVals("Maxim (iButton) FastCRC:",crc,time);
+
+  time = micros();
+  crc = softcrcIbutton(0, buf, BUFSIZE);
+  time = micros() - time;
+  printVals("Maxim (iButton) builtin:",crc,time);
+
+
+  time = micros();
+  crc = CRC16.modbus(buf, BUFSIZE);
+  time = micros() - time;
+  printVals("MODBUS FastCRC:",crc,time);
+
+  time = micros();
+  crc = softcrc(0xffff, buf, BUFSIZE);
+  time = micros() - time;
+  printVals("MODBUS builtin:",crc,time);
+
+
+  time = micros();
+  crc = CRC16.xmodem(buf, BUFSIZE);
+  time = micros() - time;
+  printVals("XMODEM FastCRC:",crc,time);
+
+  time = micros();
+  crc = softcrcXMODEM(0, buf, BUFSIZE);
+  time = micros() - time;
+  printVals("XMODEM builtin:",crc,time);
+
+  time = micros();
+  crc = CRC16.mcrf4xx(buf,BUFSIZE);
+  time = micros() - time;
+  printVals("MCRF4XX FastCRC:",crc,time);
+
+  time = micros();
+  crc = softcrcCCIT(0xffff, buf, BUFSIZE);
+  time = micros() - time;
+  printVals("MCRF4XX builtin:",crc,time);
+
+
+  time = micros();
+  crc = CRC16.kermit(buf, BUFSIZE);
+  time = micros() - time;
+  printVals("KERMIT FastCRC:",crc,time);
+
+  time = micros();
+  crc = CRC32.crc32(buf, BUFSIZE);
+  time = micros() - time;
+  printVals("Ethernet FastCRC:",crc,time);
+}