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circuitpython/ports/mimxrt10xx/reset.h

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Add initial MIMXRT10XX port
2019-11-02 11:52:26 -04:00
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
* Copyright (c) 2019 Artur Pacholec
*
* 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.
*/
#ifndef MICROPY_INCLUDED_MIMXRT10XX_RESET_H
#define MICROPY_INCLUDED_MIMXRT10XX_RESET_H
#include <stdbool.h>
#include <stdint.h>
mimxrt10xx: Add required header for NORETURN definition
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#include "py/mpconfig.h"
Add initial MIMXRT10XX port
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// Copied from inc/uf2.h in https://github.com/Microsoft/uf2-samd21
use right DBL_TAP_REG when resetting to bootloader This helps my development scripts work better, and probably also fixes a problem switching from the circuitpython environment back to arduino. (specifically, the "1200 baud" serial trick was not rebooting into the bootloader but was just resetting)
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#define DBL_TAP_REG SNVS->LPGPR[3]
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#define DBL_TAP_MAGIC 0xf01669ef // Randomly selected, adjusted to have first and last bit set
#define DBL_TAP_MAGIC_QUICK_BOOT 0xf02669ef
Add some NORETURN attributes I have a function where it should be impossible to reach the end, so I put in a safe-mode reset at the bottom: ``` int find_unused_slot(void) { // precondition: you already verified that a slot was available for (int i=0; i<NUM_SLOTS; i++) { if( slot_free(i)) { return i; } } safe_mode_reset(MICROPY_FATAL_ERROR); } ``` However, the compiler still gave a diagnostic, because safe_mode_reset was not declared NORETURN. So I started by teaching the compiler that reset_into_safe_mode never returned. This leads at least one level deeper due to reset_cpu needing to be a NORETURN function. Each port is a little different in this area. I also marked reset_to_bootloader as NORETURN. Additional notes: * stm32's reset_to_bootloader was not implemented, but now does a bare reset. Most stm32s are not fitted with uf2 bootloaders anyway. * ditto cxd56 * esp32s2 did not implement reset_cpu at all. I used esp_restart(). (not tested) * litex did not implement reset_cpu at all. I used reboot_ctrl_write. But notably this is what reset_to_bootloader already did, so one or the other must be incorrect (not tested). reboot_ctrl_write cannot be declared NORETURN, as it returns unless the special value 0xac is written), so a new unreachable forever-loop is added. * cxd56's reset is via a boardctl() call which can't generically be declared NORETURN, so a new unreacahble "for(;;)" forever-loop is added. * In several places, NVIC_SystemReset is redeclared with NORETURN applied. This is accepted just fine by gcc. I chose this as preferable to editing the multiple copies of CMSIS headers where it is normally declared. * the stub safe_mode reset simply aborts. This is used in mpy-cross.
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void reset_to_bootloader(void) NORETURN;
void reset(void) NORETURN;
Add initial MIMXRT10XX port
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bool bootloader_available(void);
#endif // MICROPY_INCLUDED_MIMXRT10XX_RESET_H