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/**
******************************************************************************
* @file Cortex/CORTEXM_MPU/Src/stm32_mpu.c
* @author MCD Application Team
* @brief Access rights configuration using Cortex-M3 MPU regions.
******************************************************************************
* @attention
*
* Copyright (c) 2019-2021 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32_mpu.h"
/** @addtogroup STM32WBxx_HAL_Examples
* @{
*/
/** @addtogroup CORTEXM_MPU
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ARRAY_ADDRESS_START (0x20002000UL)
#define ARRAY_SIZE MPU_REGION_SIZE_256B
#define ARRAY_REGION_NUMBER MPU_REGION_NUMBER3
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
#if defined ( __CC_ARM )
uint8_t PrivilegedReadOnlyArray[32] __attribute__((at(0x20002000)));
#elif defined ( __ICCARM__ )
#pragma location=0x20002000
__no_init uint8_t PrivilegedReadOnlyArray[32];
#elif defined ( __GNUC__ )
uint8_t PrivilegedReadOnlyArray[32] __attribute__((section(".ROarraySection")));
#endif
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/**
* @brief Configures the main MPU regions.
* @param None
* @retval None
*/
void MPU_Config(void)
{
MPU_Region_InitTypeDef MPU_InitStruct;
/* Disable MPU */
HAL_MPU_Disable();
/* Configure RAM region as Region N°0, 256KB of size and R/W region */
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = EXAMPLE_RAM_ADDRESS_START;
MPU_InitStruct.Size = EXAMPLE_RAM_SIZE;
MPU_InitStruct.AccessPermission = portMPU_REGION_READ_WRITE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = EXAMPLE_RAM_REGION_NUMBER;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Configure FLASH region as REGION N°1, 1MB of size and R/W region */
MPU_InitStruct.BaseAddress = EXAMPLE_FLASH_ADDRESS_START;
MPU_InitStruct.Size = EXAMPLE_FLASH_SIZE;
MPU_InitStruct.Number = EXAMPLE_FLASH_REGION_NUMBER;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Configure Peripheral region as REGION N°2, 512MB of size, R/W and Execute
Never region */
MPU_InitStruct.BaseAddress = EXAMPLE_PERIPH_ADDRESS_START;
MPU_InitStruct.Size = EXAMPLE_PERIPH_SIZE;
MPU_InitStruct.Number = EXAMPLE_PERIPH_REGION_NUMBER;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable MPU (any access not covered by any enabled region will cause a fault) */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
/**
* @brief This function configures the access right using Cortex-M4 MPU regions.
* @param None
* @retval None
*/
void MPU_AccessPermConfig(void)
{
MPU_Region_InitTypeDef MPU_InitStruct;
/* Configure region for PrivilegedReadOnlyArray as REGION N°3, 32byte and R
only in privileged mode */
/* Disable MPU */
HAL_MPU_Disable();
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.BaseAddress = ARRAY_ADDRESS_START;
MPU_InitStruct.Size = ARRAY_SIZE;
MPU_InitStruct.AccessPermission = portMPU_REGION_PRIVILEGED_READ_ONLY;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.Number = ARRAY_REGION_NUMBER;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.SubRegionDisable = 0x00;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enable MPU (any access not covered by any enabled region will cause a fault) */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
/* Read from PrivilegedReadOnlyArray. This will not generate error */
(void)PrivilegedReadOnlyArray[0];
/* Uncomment the following line to write to PrivilegedReadOnlyArray. This will
generate error */
/* PrivilegedReadOnlyArray[0] = 'e'; */
}
/**
* @}
*/
/**
* @}
*/
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