Added function to evaluate the state of the surface pressure history memory Activation of the computer during or short after landing caused a switch into divemode which could then not be left. To solve this the history memory is evaluated for significant pressure changes as the would not be expected in "normal" condition. In case of such a event (unstable) the pressure limit to enter dive mode is set to an absolute value (instead of relativ in normal mode)

--- a/Small_CPU/Inc/pressure.h	Tue Oct 01 19:58:58 2019 +0200
+++ b/Small_CPU/Inc/pressure.h	Thu Oct 03 21:26:46 2019 +0200
@@ -20,6 +20,9 @@
 float get_pressure_mbar(void);
 float get_surface_mbar(void);
 
+uint8_t is_surface_pressure_stable(void);
+float set_last_surface_pressure_stable(void);
+
 void init_surface_ring(uint8_t force);
 void update_surface_pressure(uint8_t call_rhythm_seconds);