Diff: HeptaXbee.cpp

Revision:

10:9c8433d32d11

Parent:

9:96ed36bbc9dd

Child:

11:a5a0ab9949f3

--- a/HeptaXbee.cpp	Wed Aug 08 11:01:54 2018 +0000
+++ b/HeptaXbee.cpp	Tue Aug 21 05:35:44 2018 +0000
@@ -39,6 +39,8 @@
 {
     char OutputData[255];
     int output_num,numA,numB,numC,numD,numE,numF,numG,numH,numI,numJ,numK,numL,numM,numN;
+    int sum = 0;
+    int check;
     numA = sizeof(dataA) / sizeof(dataA[0]);
     numB = sizeof(dataB) / sizeof(dataB[0]);
     numC = sizeof(dataC) / sizeof(dataC[0]);
@@ -110,10 +112,25 @@
     for(i = 0; i <= numN-1; i++) {
         OutputData[N+i] = dataN[i];
     }
+    //check sum
     for(ii=0; ii<output_num; ii++) {
-        xbee.putc(OutputData[ii]);
+        sum = sum + OutputData[ii];
     }
-    xbee.putc(0x0a);
+    check = (~sum)&0xFF;
+    char check_sum[2],flame[2];
+    sprintf( check_sum, "%02X", check);
+    sprintf( flame, "%02X", output_num);
+    // transmit data
+    for(int i = 0;i<2;i++){
+        xbee.putc(flame[i]);//frame length
+        }
+    for(ii=0; ii<output_num; ii++) {
+        xbee.putc(OutputData[ii]);//data
+    }
+    for(int i = 0;i<2;i++){
+        xbee.putc(check_sum[i]);
+        }
+    xbee.putc(0x0a);//endcode
 }
 void HeptaXbee::puts( char *s )
 {