Diff: CheckSum.h

Revision:

0:b3a521e42246

diff -r 000000000000 -r b3a521e42246 CheckSum.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CheckSum.h	Wed Oct 21 02:10:40 2015 +0000
@@ -0,0 +1,70 @@
+/** Calculate checksum(hex) of string with ASCII(unsigned int).
+ *  Use to detected communication error.
+ */
+
+/** @code
+ #include "mbed.h"
+#include "CheckSum.h"
+
+DigitalOut led[]= {LED1, LED2, LED3, LED4};
+Serial pc(USBTX, USBRX);
+int main()
+{
+    string str, tmp, checksum;
+    str= "";
+    int idx;
+    bool ans;
+    while(true) {
+        led[0]= !led[0];
+        if(pc.readable())
+            str += pc.getLine();
+        idx= str.find("\r\n");
+        if(idx != string::npos) {
+            led[1]= !led[1];
+            tmp= str.substr(0, idx);
+            str= str.substr(idx+ 2);
+
+            checksum= CheckSum::calc(tmp);
+            ans= CheckSum::compare(tmp, checksum);
+            pc.printf("%s\t%s.\r\n", tmp.c_str(), checksum.c_str());
+            if(ans)
+                pc.printf("TRUE");
+            for(int i= 1; i < 5; i++) {
+                checksum= CheckSum::calc(tmp, i);
+                ans= CheckSum::compare(tmp, checksum);
+                pc.printf("%s\t%s.\r\n", tmp.c_str(), checksum.c_str());
+                if(ans)
+                    pc.printf("TRUE");
+            }
+        }
+    }
+}
+ @endcode
+ */
+
+#pragma once
+#include "mbed.h"
+
+#include "StrLib.h"
+
+class CheckSum
+{
+public:
+    /** Create checksum (hex).
+     *  @param; str:  target
+     *          Byte: returnend string size[B].
+     *  @return; The end of hex checksum.
+     */
+    static string calc(string str, int Byte= 1);
+    
+    /** Compare Check.
+     *  @param; str: target.
+     *          sum: checksum of target.
+     *  @return; true or false.
+     *          if target equals to sum, returned true.
+     *          else, returned false.
+     */
+    static bool compare(string str, string sum);
+};
+
+// EOF
\ No newline at end of file