Differences

This shows you the differences between two versions of the page.

--- sdk:gps-udp-client-gnsstogps [2019/07/08 14:13] – fachet
+++ sdk:gps-udp-client-gnsstogps [2019/07/09 13:49] – fachet
@@ Line 58: / Line 58: @@
 	return gpsd;
+}
+string checksum(string s)
+{
+	pos = strchr(s, "*");
+  	if (is_void(pos))
+		return s; /* no checksum to correct */
+	cs = 0;
+	chars = explode(s);
+        for (i = 1; i < pos; i++) { /* skip $ and *XX */
+	    printf(" %s ", chars[i]);
+            c = ord(chars[i]);
+            cs ^= c;
+        }
+        r = sprintf("%s%02X%s", substr(s, 0, pos + 1), cs, substr(s, pos + 3));
+	return r;
 }