d542a60ae6
Attempting to cast to a `volatile uint32_t` does nothing different from cast to a `uint32_t`, with the exception of **_looking like_** it's accessing a register.
122 lines
2.8 KiB
C++
122 lines
2.8 KiB
C++
/*
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Copyright (c) 2015 Arduino LLC. All right reserved.
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SAMD51 support added by Adafruit - Copyright (c) 2018 Dean Miller for Adafruit Industries
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Arduino.h>
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#include "Reset.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define NVM_MEMORY ((volatile uint16_t *)0x000000)
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#if (ARDUINO_SAMD_VARIANT_COMPLIANCE >= 10610)
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extern const uint32_t __text_start__;
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#define APP_START ((uint32_t)(&__text_start__) + 4)
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#else
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#if defined(__SAMD51__)
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#define APP_START 0x00004004
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#else
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#define APP_START 0x00002004
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#endif
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#endif
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static inline bool nvmReady(void) {
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#if defined(__SAMD51__)
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return NVMCTRL->STATUS.reg & NVMCTRL_STATUS_READY;
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#else
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return NVMCTRL->INTFLAG.reg & NVMCTRL_INTFLAG_READY;
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#endif
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}
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__attribute__ ((long_call, section (".ramfunc")))
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static void banzai() {
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// Disable all interrupts
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__disable_irq();
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#if defined(__SAMD51__)
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//THESE MUST MATCH THE BOOTLOADER
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#define DOUBLE_TAP_MAGIC 0xf01669efUL
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#define BOOT_DOUBLE_TAP_ADDRESS (HSRAM_ADDR + HSRAM_SIZE - 4)
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unsigned long *a = (unsigned long *)BOOT_DOUBLE_TAP_ADDRESS;
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*a = DOUBLE_TAP_MAGIC;
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//NVMCTRL->ADDR.reg = APP_START;
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//NVMCTRL->CTRLB.reg = NVMCTRL_CTRLB_CMD_EB | NVMCTRL_CTRLB_CMDEX_KEY;
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// Reset the device
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NVIC_SystemReset() ;
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while (true);
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#else
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// Avoid erasing the application if APP_START is < than the minimum bootloader size
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// This could happen if without_bootloader linker script was chosen
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// Minimum bootloader size in SAMD21 family is 512bytes (RM section 22.6.5)
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if (APP_START < (0x200 + 4)) {
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goto reset;
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}
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// Erase application
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while (!nvmReady())
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;
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NVMCTRL->STATUS.reg |= NVMCTRL_STATUS_MASK;
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NVMCTRL->ADDR.reg = (uintptr_t)&NVM_MEMORY[APP_START / 4];
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NVMCTRL->CTRLA.reg = NVMCTRL_CTRLA_CMD_ER | NVMCTRL_CTRLA_CMDEX_KEY;
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while (!nvmReady())
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;
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reset:
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// Reset the device
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NVIC_SystemReset() ;
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while (true);
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#endif
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}
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static int ticks = -1;
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void initiateReset(int _ticks) {
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ticks = _ticks;
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}
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void cancelReset() {
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ticks = -1;
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}
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void tickReset() {
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if (ticks == -1)
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return;
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ticks--;
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if (ticks == 0)
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banzai();
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}
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#ifdef __cplusplus
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}
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#endif
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