Bsongis/ram saving (#6685)

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

radio/src/opentx.cpp

@@ -28,13 +28,9 @@ ModelData  g_model;
 Clipboard clipboard;
 #endif
 
-uint8_t unexpectedShutdown = 0;
-
-uint16_t vbattRTC;
-
-/* ARM: mixer duration in 0.5us */
-uint16_t maxMixerDuration;
+GlobalData globalData;
 
+uint16_t maxMixerDuration; // step = 0.01ms
 uint8_t heartbeat;
 
 #if defined(OVERRIDE_CHANNEL_FUNCTION)
@@ -672,11 +668,6 @@ getvalue_t convert16bitsTelemValue(source_t channel, ls_telemetry_value_t value)
   return value;
 }
 
-ls_telemetry_value_t minTelemValue(source_t channel)
-{
-  return 0;
-}
-
 ls_telemetry_value_t maxTelemValue(source_t channel)
 {
   return 30000;
@@ -1841,12 +1832,14 @@ void opentxInit()
   //  * radios without CPU controlled power can only use Reset status register (if available)
   if (UNEXPECTED_SHUTDOWN()) {
     TRACE("Unexpected Shutdown detected");
-    unexpectedShutdown = 1;
+    globalData.unexpectedShutdown = 1;
   }
 
 #if defined(SDCARD)
+  globalData.sdcardPresent = SD_CARD_PRESENT();
+
   // SDCARD related stuff, only done if not unexpectedShutdown
-  if (!unexpectedShutdown) {
+  if (!globalData.unexpectedShutdown) {
     sdInit();
 
 #if defined(AUTOUPDATE)
@@ -1882,7 +1875,7 @@ void opentxInit()
 #endif
 
 #if defined(COLORLCD)
-  if (!unexpectedShutdown) {
+  if (!globalData.unexpectedShutdown) {
     // g_model.topbarData is still zero here (because it was not yet read from SDCARD),
     // but we only remember the pointer to in in constructor.
     // The storageReadAll() needs topbar object, so it must be created here
@@ -1896,7 +1889,7 @@ void opentxInit()
   // handling of storage for radios that have no EEPROM
 #if !defined(EEPROM)
 #if defined(RAMBACKUP)
-  if (unexpectedShutdown) {
+  if (globalData.unexpectedShutdown) {
     // SDCARD not available, try to restore last model from RAM
     TRACE("rambackupRestore");
     rambackupRestore();
@@ -1952,7 +1945,7 @@ void opentxInit()
     backlightOn();
   }
 
-  if (!unexpectedShutdown) {
+  if (!globalData.unexpectedShutdown) {
     opentxStart();
   }