rt-thread/bsp/stm32f7-disco/drivers/drv_mpu.c

/*
 * File      : drv_mpu.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-05-17     ZYH          first implementation
 */
#include "drv_mpu.h"
#include <rtthread.h>
#include "stm32f7xx.h"
int bsp_mpu_hw_init(void)
{
    MPU_Region_InitTypeDef MPU_InitStruct;

    /* Disables the MPU */
    HAL_MPU_Disable();
    /**Initializes and configures the Region and the memory to be protected
    */
    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = MPU_REGION_NUMBER0;
    MPU_InitStruct.BaseAddress = 0x20000000;
    MPU_InitStruct.Size = MPU_REGION_SIZE_512KB;
    MPU_InitStruct.SubRegionDisable = 0x0;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;

    HAL_MPU_ConfigRegion(&MPU_InitStruct);

    /* Enables the MPU */
    HAL_MPU_Enable(MPU_HFNMI_PRIVDEF);
    return 0;
}