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digistump-sam/cores/digix/Reset.cpp

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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
+*/
+
+#include <Arduino.h>
+#include "Reset.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+__attribute__ ((long_call, section (".ramfunc")))
+void banzai() {
+	// Disable all interrupts
+	__disable_irq();
+
+	// Set bootflag to run SAM-BA bootloader at restart
+	const int EEFC_FCMD_CGPB = 0x0C;
+	const int EEFC_KEY = 0x5A;
+	while (EFC0->EEFC_FSR & EEFC_FSR_FRDY == 0);
+	EFC0->EEFC_FCR =
+		EEFC_FCR_FCMD(EEFC_FCMD_CGPB) |
+		EEFC_FCR_FARG(1) |
+		EEFC_FCR_FKEY(EEFC_KEY);
+	while (EFC0->EEFC_FSR & EEFC_FSR_FRDY == 0);
+
+	// From here flash memory is no more available.
+
+	// Memory swap needs some time to stabilize
+	for (uint32_t i=0; i<1000000; i++)
+		// force compiler to not optimize this
+		__asm__ __volatile__("");
+
+	// BANZAIIIIIII!!!
+	const int RSTC_KEY = 0xA5;
+	RSTC->RSTC_CR =
+		RSTC_CR_KEY(RSTC_KEY) |
+		RSTC_CR_PROCRST |
+		RSTC_CR_PERRST;
+
+	while (true);
+}
+
+static int ticks = -1;
+
+void initiateReset(int _ticks) {
+	ticks = _ticks;
+}
+
+void cancelReset() {
+	ticks = -1;
+}
+
+void tickReset() {
+	if (ticks == -1)
+		return;
+	ticks--;
+	if (ticks == 0)
+		banzai();
+}
+
+#ifdef __cplusplus
+}
+#endif