Waterfall with slow sweep

nanovna.h

@@ -154,7 +154,7 @@
 #define FREQ_MULTIPLIER 100         // Multiplier of the 30MHz reference to get accurate frequency correction
 #define VARIANT(X,Y) (Y)
 #define DEFAULT_IF  ((freq_t)977400000)
-#define DEFAULT_IF_PLUS  ((freq_t)1070000000)
+#define DEFAULT_IF_PLUS  ((freq_t)1069000000)
 #define DEFAULT_SPUR_OFFSET ((freq_t)(actual_rbw_x10 > 3000 ? 1500000 : 1000000))
 #define STATIC_DEFAULT_SPUR_OFFSET ((freq_t) 1500000)
 #define DEFAULT_MAX_FREQ    ((freq_t) 800000000)
@@ -992,6 +992,7 @@ void markers_reset(void);
 #define REDRAW_BATTERY    (1<<4)
 #define REDRAW_AREA       (1<<5)
 #define REDRAW_TRIGGER    (1<<6)
+#define REDRAW_INBETWEEN  (1<<7)
 extern  uint16_t redraw_request;
 
 /*

plot.c

@@ -1349,7 +1349,7 @@ draw_all(bool flush)
     draw_all_cells(flush);
 #ifdef __SCROLL__
   //  START_PROFILE
-  if (setting.waterfall)
+  if (setting.waterfall && !(redraw_request & REDRAW_INBETWEEN))
     update_waterfall();
   //  STOP_PROFILE
 #endif

sa_core.c

@@ -5289,7 +5289,7 @@ static bool sweep(bool break_on_operation)
 
       if (local_sweep_time > 10 * ONE_SECOND_TIME) {
         plot_into_index(measured);
-        redraw_request |= REDRAW_CELLS | REDRAW_BATTERY;
+        redraw_request |= REDRAW_CELLS | REDRAW_BATTERY | REDRAW_INBETWEEN;
         // plot trace and other indications as raster
         draw_all(true);  // flush markmap only if scan completed to prevent
       }