1 files changed, 40 insertions, 0 deletions
diff --git a/atmel-samd/reset.c b/atmel-samd/reset.c
new file mode 100644
index 000000000..85090c7e8
--- /dev/null
+++ b/atmel-samd/reset.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "flash_api.h"
+#include "reset.h"
+
+#include "asf/sam0/utils/cmsis/samd21/include/samd21.h"
+
+// Copied from inc/uf2.h in https://github.com/Microsoft/uf2-samd21
+#define DBL_TAP_PTR ((volatile uint32_t *)(HMCRAMC0_ADDR + HMCRAMC0_SIZE - 4))
+#define DBL_TAP_MAGIC 0xf01669ef // Randomly selected, adjusted to have first and last bit set
+
+void reset_to_bootloader(void) {
+    flash_flush();
+    *DBL_TAP_PTR = DBL_TAP_MAGIC;
+    NVIC_SystemReset();
+}