ao-telem: Add new program to convert telem data to ascii

[fw/altos] / ao-tools / lib / cc-telemetry.c

diff --git a/ao-tools/lib/cc-telemetry.c b/ao-tools/lib/cc-telemetry.c
new file mode 100644 (file)
index 0000000..2cdb9ca
--- /dev/null
+++ b/ao-tools/lib/cc-telemetry.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "cc.h"
+#include <string.h>
+
+static int
+parse_byte(char *data, uint8_t *byte)
+{
+       char    d[3];
+       int x;
+       d[0] = data[0];
+       d[1] = data[1];
+       d[2] = '\0';
+
+       if (sscanf(d, "%x", &x) != 1)
+               return FALSE;
+       *byte = x;
+       return TRUE;
+}
+
+int
+cc_telemetry_parse(const char *input_line, union ao_telemetry_all *telemetry)
+{
+       uint8_t *byte;
+       char *data;
+       uint8_t hex[35];
+       int i;
+
+       if (strncmp(input_line, "TELEM", 5) != 0)
+               return FALSE;
+
+       data = strchr (input_line, ' ');
+       if (!data)
+               return FALSE;
+       data++;
+       byte = hex;
+       for (i = 0; i < 35; i++) {
+               if (!parse_byte(data, byte))
+                       return FALSE;
+               data += 2;
+               byte++;
+       }
+       if (hex[0] != 34)
+               return FALSE;
+       memcpy(telemetry, hex+1, 32);
+       return TRUE;
+}