ea6d73f140
1. Upgrade Cortex driver library (CMSIS -> CMSIS & Device): version 2.3.2 -> 3.0.1 & 3.0.0 - Remove "bsp/efm32/Libraries/CMSIS/Lib/ARM", "bsp/efm32/Libraries/CMSIS/Lib/G++" and "bsp/efm32/Libraries/CMSIS/SVD" to save space 2. Upgrade EFM32 driver libraries (efm32lib -> emlib): version 2.3.2 -> 3.0.0 - Remove "bsp/efm32/Libraries/Device/EnergyMicro/EFM32LG" and "bsp/efm32/Libraries/Device/EnergyMicro/EFM32TG" to save space 3. Upgrade EFM32GG_DK3750 development kit driver library: version 1.2.2 -> 2.0.1 4. Upgrade EFM32_Gxxx_DK development kit driver library: version 1.7.3 -> 2.0.1 5. Add energy management unit driver and test code 6. Modify linker script and related code to compatible with new version of libraries 7. Change EFM32 branch version number to 1.0 8. Add photo frame demo application git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2122 bbd45198-f89e-11dd-88c7-29a3b14d5316
123 lines
4.9 KiB
C
123 lines
4.9 KiB
C
/***************************************************************************//**
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* @file
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* @brief Memory Protection Unit (MPU) Peripheral API
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* @author Energy Micro AS
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* @version 3.0.0
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#include "em_mpu.h"
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#include "em_assert.h"
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/***************************************************************************//**
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* @addtogroup EM_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup MPU
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* @brief Memory Protection Unit (MPU) Peripheral API
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* @details
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* This module contains functions to enable, disable and setup the MPU.
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* The MPU is used to control access attributes and permissions in the
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* memory map. The settings that can be controlled are:
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*
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* @li Executable attribute.
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* @li Cachable, bufferable and shareable attributes.
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* @li Cache policy.
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* @li Access permissions: Priviliged or User state, read or write access,
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* and combinations of all these.
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*
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* The MPU can be activated and deactivated with functions:
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* @verbatim
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* MPU_Enable(..);
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* MPU_Disable();@endverbatim
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* The MPU can control 8 memory regions with individual access control
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* settings. Section attributes and permissions are set with:
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* @verbatim
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* MPU_ConfigureRegion(..);@endverbatim
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* It is advisable to disable the MPU when altering region settings.
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*
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*
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* @{
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******************************************************************************/
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/*******************************************************************************
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************************** GLOBAL FUNCTIONS *******************************
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******************************************************************************/
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/***************************************************************************//**
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* @brief
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* Configure an MPU region.
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*
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* @details
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* Writes to MPU RBAR and RASR registers.
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* Refer to Cortex-M3 Reference Manual, MPU chapter for further details.
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* To disable a region it is only required to set init->regionNo to the
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* desired value and init->regionEnable = false.
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*
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* @param[in] init
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* Pointer to a structure containing MPU region init information.
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******************************************************************************/
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void MPU_ConfigureRegion(const MPU_RegionInit_TypeDef *init)
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{
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EFM_ASSERT(init->regionNo < ((MPU->TYPE & MPU_TYPE_DREGION_Msk) >>
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MPU_TYPE_DREGION_Pos));
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MPU->RNR = init->regionNo;
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if (init->regionEnable)
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{
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EFM_ASSERT(!(init->baseAddress & ~MPU_RBAR_ADDR_Msk));
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EFM_ASSERT(init->tex <= 0x7);
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MPU->RBAR = init->baseAddress;
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MPU->RASR = ((init->disableExec ? 1 : 0) << MPU_RASR_XN_Pos) |
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(init->accessPermission << MPU_RASR_AP_Pos) |
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(init->tex << MPU_RASR_TEX_Pos) |
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((init->shareable ? 1 : 0) << MPU_RASR_S_Pos) |
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((init->cacheable ? 1 : 0) << MPU_RASR_C_Pos) |
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((init->bufferable ? 1 : 0) << MPU_RASR_B_Pos) |
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(init->srd << MPU_RASR_SRD_Pos) |
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(init->size << MPU_RASR_SIZE_Pos) |
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(1 << MPU_RASR_ENABLE_Pos);
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}
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else
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{
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MPU->RBAR = 0;
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MPU->RASR = 0;
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}
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}
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/** @} (end addtogroup CMU) */
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/** @} (end addtogroup EM_Library) */
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