Add getMainTaskHwm() function.

Former-commit-id: 1b33399

Author: h2zero

cores/nRF5/Arduino.h

@@ -39,6 +39,7 @@ void yield( void ) ;
 void setup( void ) ;
 void loop( void ) ;
 uint32_t get_isr_stack_hwm(void);
+uint32_t getMainTaskHwm(void);
 
 #include "WVariant.h"
 

cores/nRF5/main.cpp

@@ -22,10 +22,16 @@
 #include "freertos/task.h"
 #include "Arduino.h"
 
-#ifdef CONFIG_MAIN_TASK_STACK_SIZE
-#define MAIN_TASK_STACK_SIZE CONFIG_MAIN_TASK_STACK_SIZE
+#if defined(CONFIG_MAIN_TASK_STACK_SIZE)
+#  define MAIN_TASK_STACK_SIZE CONFIG_MAIN_TASK_STACK_SIZE
+#elif defined(DEVICE_RAM_SIZE)
+#  if DEVICE_RAM_SIZE < 32
+#    define MAIN_TASK_STACK_SIZE 1024
+#  else
+#    define MAIN_TASK_STACK_SIZE 2048
+#  endif
 #else
-#define MAIN_TASK_STACK_SIZE 1024
+#  define MAIN_TASK_STACK_SIZE 2048
 #endif
 
 // Weak empty variant initialization function.
@@ -72,3 +78,7 @@ int main( void )
 
   return 0;
 }
+
+uint32_t getMainTaskHwm() {
+  return uxTaskGetStackHighWaterMark(_loopTaskHandle);
+}