initial commit

2022-03-22 21:10:43 +01:00
commit b5e57da5a0
531 changed files with 180736 additions and 0 deletions
--- a/lib/Crc16/examples/Crc16_Example/Crc16_Example.ino
+++ b/lib/Crc16/examples/Crc16_Example/Crc16_Example.ino
@@ -0,0 +1,85 @@
+#include <Crc16.h>
+//Crc 16 library (XModem)
+Crc16 crc; 
+
+void setup()
+{
+    Serial.begin(38400); 
+    Serial.println("CRC-16 bit test program");
+    Serial.println("=======================");
+  
+}
+
+void loop()
+{
+  /*
+    Examples of crc-16 configurations
+    Kermit: width=16 poly=0x1021 init=0x0000 refin=true  refout=true  xorout=0x0000 check=0x2189
+    Modbus: width=16 poly=0x8005 init=0xffff refin=true  refout=true  xorout=0x0000 check=0x4b37
+    XModem: width=16 poly=0x1021 init=0x0000 refin=false refout=false xorout=0x0000 check=0x31c3
+    CCITT-False:width=16 poly=0x1021 init=0xffff refin=false refout=false xorout=0x0000 check=0x29b1
+    see http://www.lammertbies.nl/comm/info/crc-calculation.html
+  */
+  //calculate crc incrementally
+  byte data[] = "123456789";
+  
+  Serial.println("Calculating crc incrementally");
+  
+  crc.clearCrc();
+  for(byte i=0;i<9;i++)
+  {
+     Serial.print("byte ");
+     Serial.print(i);
+     Serial.print(" = ");
+     Serial.println(data[i]);
+     crc.updateCrc(data[i]);
+  }
+  unsigned short value = crc.getCrc();
+  Serial.print("crc = 0x");
+  Serial.println(value, HEX);
+  
+  Serial.println("Calculating crc in a single call");
+  
+  //XModem
+  value = crc.XModemCrc(data,0,9);
+  Serial.print("XModem crc = 0x");    
+  Serial.println(value, HEX);
+  //Reference xmodem
+  Serial.println("Reference XModem crc");
+  value = calcrc((char*)data, 9);
+  Serial.print("crc = 0x");    
+  Serial.println(value, HEX);
+
+  //Modbus
+  value = crc.Modbus(data,0,9);
+  Serial.print("Modbus crc = 0x");    
+  Serial.println(value, HEX);
+
+  //Mcrf4XX
+  value = crc.Mcrf4XX(data,0,9);
+  Serial.print("Mcrf4XX crc = 0x");    
+  Serial.println(value, HEX);
+
+  while(true);
+}
+//Check routine taken from
+//http://web.mit.edu/6.115/www/miscfiles/amulet/amulet-help/xmodem.htm
+int calcrc(char *ptr, int count)
+{
+    int  crc;
+    char i;
+    crc = 0;
+    while (--count >= 0)
+    {
+        crc = crc ^ (int) *ptr++ << 8;
+        i = 8;
+        do
+        {
+            if (crc & 0x8000)
+                crc = crc << 1 ^ 0x1021;
+            else
+                crc = crc << 1;
+        } while(--i);
+    }
+    return (crc);
+}