Bsongis/ram saving (#6685)

RAM saving. Stacks reduced to have some more RAM available than 2.2 on all boards

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

@@ -22,44 +22,46 @@
 
 void menuChannelsView(event_t event)
 {
-  static bool longNames = false;
-  static bool secondPage = false;
-  static bool mixersView = false;
   uint8_t ch = 0;
-  uint8_t wbar = (longNames ? 54 : 64);
+  uint8_t wbar = (reusableBuffer.viewChannels.longNames ? 54 : 64);
   int16_t limits = 512 * 2;
 
 #if defined(PPM_UNIT_PERCENT_PREC1)
   wbar -= 6;
 #endif
 
-  switch(event)
-  {
+  switch(event) {
+    case EVT_ENTRY:
+      memclear(&reusableBuffer.viewChannels, sizeof(reusableBuffer.viewChannels));
+      break;
+
     case EVT_KEY_BREAK(KEY_EXIT):
       popMenu();
       break;
+
     case EVT_KEY_FIRST(KEY_RIGHT):
     case EVT_KEY_FIRST(KEY_LEFT):
 #if defined(ROTARY_ENCODER_NAVIGATION)
     case EVT_ROTARY_LEFT:
     case EVT_ROTARY_RIGHT:
 #endif
-      secondPage = !secondPage;
+      reusableBuffer.viewChannels.secondPage = !reusableBuffer.viewChannels.secondPage;
       break;
+
     case EVT_KEY_FIRST(KEY_ENTER):
-      mixersView = !mixersView;
+      reusableBuffer.viewChannels.mixersView = !reusableBuffer.viewChannels.mixersView;
       break;
   }
 
-  if (secondPage)
+  if (reusableBuffer.viewChannels.secondPage)
     ch = 16;
 
-  if (mixersView)
+  if (reusableBuffer.viewChannels.mixersView)
     limits *= 2;  // this could be handled nicer, but slower, by checking actual range for this mixer
   else if (g_model.extendedLimits)
     limits *= LIMIT_EXT_PERCENT / 100;
 
-  if (mixersView)
+  if (reusableBuffer.viewChannels.mixersView)
     lcdDrawTextAlignedCenter(0, TR_MIXERS_MONITOR);
   else
     lcdDrawTextAlignedCenter(0, TR_CHANNELS_MONITOR);
@@ -76,13 +78,13 @@ void menuChannelsView(event_t event)
     // Channels
     for (uint8_t line=0; line < 8; line++) {
       const uint8_t y = 9 + line * 7;
-      const int32_t val = mixersView ? ex_chans[ch] : channelOutputs[ch];
+      const int32_t val = reusableBuffer.viewChannels.mixersView ? ex_chans[ch] : channelOutputs[ch];
       const uint8_t lenLabel = ZLEN(g_model.limitData[ch].name);
 
       // Channel name if present, number if not
       if (lenLabel > 0) {
         if (lenLabel > 4)
-          longNames = true;
+          reusableBuffer.viewChannels.longNames = true;
         lcdDrawSizedText(x+1-ofs, y, g_model.limitData[ch].name, sizeof(g_model.limitData[ch].name), ZCHAR | SMLSIZE);
       }
       else {