Decode HDOP data from skytraq GPS

[fw/altos] / src / ao_gps_skytraq.c

diff --git a/src/ao_gps_skytraq.c b/src/ao_gps_skytraq.c
index bf192f28e4f0f0e4d8a0eef3e0fcaa688b328ba5..ef581349ad75fe6ccc3c5c1ac5474abb988f4a42 100644 (file)
--- a/src/ao_gps_skytraq.c
+++ b/src/ao_gps_skytraq.c
@@ -271,7 +271,15 @@ ao_gps(void) __reentrant
                        ao_gps_next.flags |= i;
 
                        ao_gps_lexchar();
-                       ao_gps_skip_field();    /* Horizontal dilution */
+                       ao_gps_next.hdop = ao_gps_decimal(0xff);
+                       if (ao_gps_next.hdop <= 50) {
+                               ao_gps_next.hdop = (uint8_t) 5 * ao_gps_next.hdop;
+                               if (ao_gps_char == '.')
+                                       ao_gps_next.hdop = (ao_gps_next.hdop +
+                                                           ((uint8_t) ao_gps_decimal(1) >> 1));
+                       } else
+                               ao_gps_next.hdop = 255;
+                       ao_gps_skip_field();
 
                        ao_gps_next.altitude = ao_gps_decimal(0xff);
                        ao_gps_skip_field();    /* skip any fractional portion */