Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_mpu.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
50:a417edff4437
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 2 * @file em_mpu.c
bogdanm 0:9b334a45a8ff 3 * @brief Memory Protection Unit (MPU) Peripheral API
bogdanm 0:9b334a45a8ff 4 * @version 3.20.12
bogdanm 0:9b334a45a8ff 5 *******************************************************************************
bogdanm 0:9b334a45a8ff 6 * @section License
bogdanm 0:9b334a45a8ff 7 * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
bogdanm 0:9b334a45a8ff 8 *******************************************************************************
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Permission is granted to anyone to use this software for any purpose,
bogdanm 0:9b334a45a8ff 11 * including commercial applications, and to alter it and redistribute it
bogdanm 0:9b334a45a8ff 12 * freely, subject to the following restrictions:
bogdanm 0:9b334a45a8ff 13 *
bogdanm 0:9b334a45a8ff 14 * 1. The origin of this software must not be misrepresented; you must not
bogdanm 0:9b334a45a8ff 15 * claim that you wrote the original software.
bogdanm 0:9b334a45a8ff 16 * 2. Altered source versions must be plainly marked as such, and must not be
bogdanm 0:9b334a45a8ff 17 * misrepresented as being the original software.
bogdanm 0:9b334a45a8ff 18 * 3. This notice may not be removed or altered from any source distribution.
bogdanm 0:9b334a45a8ff 19 *
bogdanm 0:9b334a45a8ff 20 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
bogdanm 0:9b334a45a8ff 21 * obligation to support this Software. Silicon Labs is providing the
bogdanm 0:9b334a45a8ff 22 * Software "AS IS", with no express or implied warranties of any kind,
bogdanm 0:9b334a45a8ff 23 * including, but not limited to, any implied warranties of merchantability
bogdanm 0:9b334a45a8ff 24 * or fitness for any particular purpose or warranties against infringement
bogdanm 0:9b334a45a8ff 25 * of any proprietary rights of a third party.
bogdanm 0:9b334a45a8ff 26 *
bogdanm 0:9b334a45a8ff 27 * Silicon Labs will not be liable for any consequential, incidental, or
bogdanm 0:9b334a45a8ff 28 * special damages, or any other relief, or for any claim by any third party,
bogdanm 0:9b334a45a8ff 29 * arising from your use of this Software.
bogdanm 0:9b334a45a8ff 30 *
bogdanm 0:9b334a45a8ff 31 ******************************************************************************/
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "em_mpu.h"
bogdanm 0:9b334a45a8ff 35 #if defined(__MPU_PRESENT) && (__MPU_PRESENT == 1)
bogdanm 0:9b334a45a8ff 36 #include "em_assert.h"
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 40 * @addtogroup EM_Library
bogdanm 0:9b334a45a8ff 41 * @{
bogdanm 0:9b334a45a8ff 42 ******************************************************************************/
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44
bogdanm 0:9b334a45a8ff 45 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 46 * @addtogroup MPU
bogdanm 0:9b334a45a8ff 47 * @brief Memory Protection Unit (MPU) Peripheral API
bogdanm 0:9b334a45a8ff 48 * @details
bogdanm 0:9b334a45a8ff 49 * This module contains functions to enable, disable and setup the MPU.
bogdanm 0:9b334a45a8ff 50 * The MPU is used to control access attributes and permissions in the
bogdanm 0:9b334a45a8ff 51 * memory map. The settings that can be controlled are:
bogdanm 0:9b334a45a8ff 52 *
bogdanm 0:9b334a45a8ff 53 * @li Executable attribute.
bogdanm 0:9b334a45a8ff 54 * @li Cachable, bufferable and shareable attributes.
bogdanm 0:9b334a45a8ff 55 * @li Cache policy.
bogdanm 0:9b334a45a8ff 56 * @li Access permissions: Priviliged or User state, read or write access,
bogdanm 0:9b334a45a8ff 57 * and combinations of all these.
bogdanm 0:9b334a45a8ff 58 *
bogdanm 0:9b334a45a8ff 59 * The MPU can be activated and deactivated with functions:
bogdanm 0:9b334a45a8ff 60 * @verbatim
bogdanm 0:9b334a45a8ff 61 * MPU_Enable(..);
bogdanm 0:9b334a45a8ff 62 * MPU_Disable();@endverbatim
bogdanm 0:9b334a45a8ff 63 * The MPU can control 8 memory regions with individual access control
bogdanm 0:9b334a45a8ff 64 * settings. Section attributes and permissions are set with:
bogdanm 0:9b334a45a8ff 65 * @verbatim
bogdanm 0:9b334a45a8ff 66 * MPU_ConfigureRegion(..);@endverbatim
bogdanm 0:9b334a45a8ff 67 * It is advisable to disable the MPU when altering region settings.
bogdanm 0:9b334a45a8ff 68 *
bogdanm 0:9b334a45a8ff 69 *
bogdanm 0:9b334a45a8ff 70 * @{
bogdanm 0:9b334a45a8ff 71 ******************************************************************************/
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 /*******************************************************************************
bogdanm 0:9b334a45a8ff 75 ************************** GLOBAL FUNCTIONS *******************************
bogdanm 0:9b334a45a8ff 76 ******************************************************************************/
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 80 * @brief
bogdanm 0:9b334a45a8ff 81 * Configure an MPU region.
bogdanm 0:9b334a45a8ff 82 *
bogdanm 0:9b334a45a8ff 83 * @details
bogdanm 0:9b334a45a8ff 84 * Writes to MPU RBAR and RASR registers.
bogdanm 0:9b334a45a8ff 85 * Refer to Cortex-M3 Reference Manual, MPU chapter for further details.
bogdanm 0:9b334a45a8ff 86 * To disable a region it is only required to set init->regionNo to the
bogdanm 0:9b334a45a8ff 87 * desired value and init->regionEnable = false.
bogdanm 0:9b334a45a8ff 88 *
bogdanm 0:9b334a45a8ff 89 * @param[in] init
bogdanm 0:9b334a45a8ff 90 * Pointer to a structure containing MPU region init information.
bogdanm 0:9b334a45a8ff 91 ******************************************************************************/
bogdanm 0:9b334a45a8ff 92 void MPU_ConfigureRegion(const MPU_RegionInit_TypeDef *init)
bogdanm 0:9b334a45a8ff 93 {
bogdanm 0:9b334a45a8ff 94 EFM_ASSERT(init->regionNo < ((MPU->TYPE & MPU_TYPE_DREGION_Msk) >>
bogdanm 0:9b334a45a8ff 95 MPU_TYPE_DREGION_Pos));
bogdanm 0:9b334a45a8ff 96
bogdanm 0:9b334a45a8ff 97 MPU->RNR = init->regionNo;
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 if (init->regionEnable)
bogdanm 0:9b334a45a8ff 100 {
bogdanm 0:9b334a45a8ff 101 EFM_ASSERT(!(init->baseAddress & ~MPU_RBAR_ADDR_Msk));
bogdanm 0:9b334a45a8ff 102 EFM_ASSERT(init->tex <= 0x7);
bogdanm 0:9b334a45a8ff 103
bogdanm 0:9b334a45a8ff 104 MPU->RBAR = init->baseAddress;
bogdanm 0:9b334a45a8ff 105 MPU->RASR = ((init->disableExec ? 1 : 0) << MPU_RASR_XN_Pos) |
bogdanm 0:9b334a45a8ff 106 (init->accessPermission << MPU_RASR_AP_Pos) |
bogdanm 0:9b334a45a8ff 107 (init->tex << MPU_RASR_TEX_Pos) |
bogdanm 0:9b334a45a8ff 108 ((init->shareable ? 1 : 0) << MPU_RASR_S_Pos) |
bogdanm 0:9b334a45a8ff 109 ((init->cacheable ? 1 : 0) << MPU_RASR_C_Pos) |
bogdanm 0:9b334a45a8ff 110 ((init->bufferable ? 1 : 0) << MPU_RASR_B_Pos) |
bogdanm 0:9b334a45a8ff 111 (init->srd << MPU_RASR_SRD_Pos) |
bogdanm 0:9b334a45a8ff 112 (init->size << MPU_RASR_SIZE_Pos) |
bogdanm 0:9b334a45a8ff 113 (1 << MPU_RASR_ENABLE_Pos);
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115 else
bogdanm 0:9b334a45a8ff 116 {
bogdanm 0:9b334a45a8ff 117 MPU->RBAR = 0;
bogdanm 0:9b334a45a8ff 118 MPU->RASR = 0;
bogdanm 0:9b334a45a8ff 119 }
bogdanm 0:9b334a45a8ff 120 }
bogdanm 0:9b334a45a8ff 121
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 /** @} (end addtogroup CMU) */
bogdanm 0:9b334a45a8ff 124 /** @} (end addtogroup EM_Library) */
bogdanm 0:9b334a45a8ff 125 #endif /* defined(__MPU_PRESENT) && (__MPU_PRESENT == 1) */