circuitpython/ports/stm/common-hal/microcontroller/__init__.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Scott Shawcroft for Adafruit Industries
 * Copyright (c) 2019 Lucian Copeland 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 "py/mphal.h"
#include "py/obj.h"
#include "py/runtime.h"

#include "common-hal/microcontroller/Pin.h"
#include "common-hal/microcontroller/Processor.h"

#include "shared-bindings/nvm/ByteArray.h"
#include "shared-bindings/microcontroller/__init__.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/microcontroller/Processor.h"
#include "supervisor/port.h"
#include "supervisor/filesystem.h"
#include "supervisor/shared/safe_mode.h"

void common_hal_mcu_delay_us(uint32_t delay) {
    uint32_t ticks_per_us = HAL_RCC_GetSysClockFreq() / 1000000UL;
    delay *= ticks_per_us;
    SysTick->VAL = 0UL;
    SysTick->LOAD = delay;
    SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;
    while ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == 0) {
    }
    SysTick->CTRL = 0UL;
}

volatile uint32_t nesting_count = 0;

void common_hal_mcu_disable_interrupts(void) {
    __disable_irq();
    __DMB();
    nesting_count++;
}

void common_hal_mcu_enable_interrupts(void) {
    if (nesting_count == 0) {
        // This is very very bad because it means there was mismatched disable/enables.
        reset_into_safe_mode(SAFE_MODE_INTERRUPT_ERROR);
    }
    nesting_count--;
    if (nesting_count > 0) {
        return;
    }
    __DMB();
    __enable_irq();
}

static bool next_reset_to_bootloader = false;

void common_hal_mcu_on_next_reset(mcu_runmode_t runmode) {
    if (runmode == RUNMODE_SAFE_MODE) {
        safe_mode_on_next_reset(SAFE_MODE_PROGRAMMATIC);
    }
    if (runmode == RUNMODE_BOOTLOADER) {
        next_reset_to_bootloader = true;
    }
}

void common_hal_mcu_reset(void) {
    filesystem_flush(); // TODO: implement as part of flash improvements

    if (next_reset_to_bootloader) {
        reset_to_bootloader();
    } else {
        NVIC_SystemReset();
    }
}

// The singleton microcontroller.Processor object, bound to microcontroller.cpu
// It currently only has properties, and no state.
const mcu_processor_obj_t common_hal_mcu_processor_obj = {
    .base = {
        .type = &mcu_processor_type,
    },
};

#if CIRCUITPY_INTERNAL_NVM_SIZE > 0
// The singleton nvm.ByteArray object.
const nvm_bytearray_obj_t common_hal_mcu_nvm_obj = {
    .base = {
        .type = &nvm_bytearray_type,
    },
    .len = NVM_BYTEARRAY_BUFFER_SIZE,
    .start_address = (uint8_t *)(CIRCUITPY_INTERNAL_NVM_START_ADDR)
};
#endif