tmrttmrt/Fixes#2750__Mega2560_ST7920_mixer_freq_too_slow

radio/src/main_avr.cpp

@@ -43,6 +43,9 @@ void perMain()
 {
 #if defined(SIMU)
   doMixerCalculations();
+#endif
+#if defined(LCD_ST7920)
+	uint8_t lcdstate=0;
 #endif
   uint16_t t0 = getTmr16KHz();
   int16_t delta = (nextMixerEndTime - lastMixerDuration) - t0;
@@ -129,6 +132,9 @@ void perMain()
   const char *warn = s_warning;
   uint8_t menu = s_menu_count;
 
+#if defined(LCD_ST7920)
+  if(0==lcdstate){//No need to redraw until lcdRefresh_ST7920(0) below completely refreshes the display.
+#endif
   lcd_clear();
   if (menuEvent) {
     m_posVert = menuEvent == EVT_ENTRY_UP ? g_menuPos[g_menuStackPtr] : 0;
@@ -153,7 +159,13 @@ void perMain()
 
   drawStatusLine();
 
+#if defined(LCD_ST7920)
+  }
+  lcdstate=lcdRefresh_ST7920(0);
+#else
   lcdRefresh();
+#endif
+
 #endif
 
   if (SLAVE_MODE()) {