feat(bw): do not show time on main view when RTC not set (#5342)

radio/src/gui/128x64/view_main.cpp

@@ -674,13 +674,13 @@ void menuMainView(event_t event)
     lcdDrawText(15 * FW, 0, "BIND", 0);
   }
 #if defined(RTCLOCK)
-  else if (view_base != VIEW_CHAN_MONITOR) {
+  else if (view_base != VIEW_CHAN_MONITOR && rtcIsValid()) {
     drawRtcTime(CLOCK_X, CLOCK_Y, LEFT|TIMEBLINK);
   }
 #endif
 #else
 #if defined(RTCLOCK)
-  if (view_base != VIEW_CHAN_MONITOR) {
+  if (view_base != VIEW_CHAN_MONITOR && rtcIsValid()) {
     drawRtcTime(CLOCK_X, CLOCK_Y, LEFT|TIMEBLINK);
   }
 #endif

radio/src/gui/212x64/view_main.cpp

@@ -335,7 +335,7 @@ void displayTopBar()
     LCD_ICON(BAR_VOLUME_X, BAR_Y, ICON_SPEAKER3);
 
   /* RTC time */
-  drawRtcTime(BAR_TIME_X, BAR_Y+1, LEFT|TIMEBLINK);
+  if (rtcIsValid()) drawRtcTime(BAR_TIME_X, BAR_Y+1, LEFT|TIMEBLINK);
 
   /* The background */
   lcdDrawFilledRect(BAR_X, BAR_Y, BAR_W, BAR_H, SOLID, FILL_WHITE|GREY(12)|ROUND);

radio/src/rtc.cpp

@@ -493,3 +493,16 @@ uint8_t rtcAdjust(uint16_t year, uint8_t mon, uint8_t day, uint8_t hour, uint8_t
   }
   return 0;
 }
+
+bool rtcIsValid()
+{
+  struct gtm t;
+  gettime(&t);
+
+  // If year is 2000, rtc circuit aren't working
+  // No RTC battery or other issue
+  if (t.tm_year <= 100)
+    return false;
+
+  return true;
+}

radio/src/rtc.h

@@ -50,6 +50,7 @@ struct gtm
 extern gtime_t g_rtcTime;
 extern uint8_t g_ms100; // global to allow time set function to reset to zero
 
+bool rtcIsValid();
 void rtcInit();
 void rtcSetTime(const struct gtm * tm);
 gtime_t gmktime (struct gtm *tm);