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digistump-sam/cores/digix/hooks.c

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+/*
+  Copyright (c) 2012 Arduino.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/**
+ * Empty yield() hook.
+ *
+ * This function is intended to be used by library writers to build
+ * libraries or sketches that supports cooperative threads.
+ *
+ * Its defined as a weak symbol and it can be redefined to implement a
+ * real cooperative scheduler.
+ */
+static void __empty() {
+	// Empty
+}
+void yield(void) __attribute__ ((weak, alias("__empty")));
+
+/**
+ * SysTick hook
+ *
+ * This function is called from SysTick handler, before the default
+ * handler provided by Arduino.
+ */
+static int __false() {
+	// Return false
+	return 0;
+}
+int sysTickHook(void) __attribute__ ((weak, alias("__false")));
+
+/**
+ * SVC hook
+ * PendSV hook
+ *
+ * These functions are called from SVC handler, and PensSV handler.
+ * Default action is halting.
+ */
+static void __halt() {
+	// Halts
+	while (1)
+		;
+}
+void svcHook(void)    __attribute__ ((weak, alias("__halt")));
+void pendSVHook(void) __attribute__ ((weak, alias("__halt")));