Build two versions of TM, one for SiRF, one for SkyTraq

[fw/altos] / src / skytraq-cksum

diff --git a/src/skytraq-cksum b/src/skytraq-cksum
new file mode 100644 (file)
index 0000000..e4960bf
--- /dev/null
+++ b/src/skytraq-cksum
@@ -0,0 +1,44 @@
+#!/usr/bin/env nickle
+
+int checksum(int[] msg)
+{
+       int sum = 0;
+       for (int i = 0; i < dim(msg); i++) {
+               sum ^= msg[i];
+               sum &= 0xff;
+       }
+       return sum;
+}
+
+void main()
+{
+       string[...]     input;
+       int[...]        msg;
+
+       setdim(input, 0);
+       while (!File::end(stdin)) {
+               input[dim(input)] = gets();
+       }
+
+       setdim(msg, 0);
+       for (int i = 0; i < dim(input); i++) {
+               string[*] words = String::wordsplit(input[i], " ,\t");
+               for (int j = 0; j < dim(words); j++) {
+                       if (words[j] == "/" + "*")
+                               break;
+                       if (String::length(words[j]) > 0 &&
+                           Ctype::isdigit(words[j][0])) {
+                               msg[dim(msg)] = string_to_integer(words[j]);
+                       }
+                }
+       }
+       printf("\t0xa0, 0xa1, 0x02x, 0x%02x,\t\t/* length: %d bytes */\n",
+              dim(msg) >> 8, dim(msg) & 0xff, dim(msg));
+       for (int i = 0; i < dim(input); i++)
+               printf("%s\n", input[i]);
+       int csum = checksum(msg);
+       printf ("\t0x%02x, 0x0d, 0x0a,\n",
+               csum);
+}
+
+main();