Make main thread stack size configurable

include/Thread.h

@@ -32,6 +32,19 @@ extern "C" {
  */
 #define THREAD_SYSTICK_MS 1
 
+/**
+ * Default stack size for the main thread.
+ */
+#define THREAD_DEFAULT_STACKSIZE 1024
+
+/**
+ * Defines the stack size for the main thread.
+ * This must be used outside of any function. If this
+ * macro isn't used, the stack size will default to
+ * THREAD_DEFAULT_STACKSIZE.
+ */
+#define THREAD_MAIN_STACKSIZE(size) uint16_t Startup_mainThreadStackSize = (size)
+
 /**
  * Type for thread handles.
  */

src/startup/mainthread.c

@@ -17,13 +17,17 @@
  * Copyright (C) 2016 ReservedField
  */
 
+#include <stdint.h>
 #include <M451Series.h>
 #include <Thread.h>
 
 extern void __libc_init_array();
 extern void __libc_fini_array();
 extern int main();
 
+// Weak: address will be NULL if not defined by application code
+extern uint16_t Startup_mainThreadStackSize __attribute__((weak));
+
 /**
  * Main thread.
  *
@@ -52,6 +56,12 @@ void *Startup_MainThread(void *args) {
  */
 void Startup_CreateMainThread() {
 	Thread_t mainThread;
+	uint16_t stackSize;
+
+	stackSize = THREAD_DEFAULT_STACKSIZE;
+	if(&Startup_mainThreadStackSize != NULL) {
+		stackSize = Startup_mainThreadStackSize;
+	}
 
-	Thread_Create(&mainThread, Startup_MainThread, NULL, 1024);
+	Thread_Create(&mainThread, Startup_MainThread, NULL, stackSize);
 }