-__data enum flight_state ao_flight_state; /* current flight state */
-__data uint16_t ao_flight_state_tick; /* time of last data */
-__data int16_t ao_flight_accel; /* filtered acceleration */
-__data int16_t ao_flight_pres; /* filtered pressure */
-__data int16_t ao_ground_pres; /* startup pressure */
-__data int16_t ao_ground_accel; /* startup acceleration */
-__data int16_t ao_min_pres; /* minimum recorded pressure */
-__data uint16_t ao_launch_time; /* time of launch detect */
+__pdata enum flight_state ao_flight_state; /* current flight state */
+__pdata uint16_t ao_flight_tick; /* time of last data */
+__pdata int16_t ao_flight_accel; /* filtered acceleration */
+__pdata int16_t ao_flight_pres; /* filtered pressure */
+__pdata int16_t ao_ground_pres; /* startup pressure */
+__pdata int16_t ao_ground_accel; /* startup acceleration */
+__pdata int16_t ao_min_pres; /* minimum recorded pressure */
+__pdata uint16_t ao_launch_time; /* time of launch detect */
+__pdata int16_t ao_main_pres; /* pressure to eject main */
+
+/*
+ * track min/max data over a long interval to detect
+ * resting
+ */
+__pdata uint16_t ao_interval_end;
+__pdata int16_t ao_interval_cur_min_accel;
+__pdata int16_t ao_interval_cur_max_accel;
+__pdata int16_t ao_interval_cur_min_pres;
+__pdata int16_t ao_interval_cur_max_pres;
+__pdata int16_t ao_interval_min_accel;
+__pdata int16_t ao_interval_max_accel;
+__pdata int16_t ao_interval_min_pres;
+__pdata int16_t ao_interval_max_pres;
+
+#define AO_INTERVAL_TICKS AO_SEC_TO_TICKS(5)