Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/cmsis/TARGET_ARM_SSG/TARGET_MPS2_M7/system_CMSDK_CM7.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
80:bdf1132a57cf
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 /* MPS2 CMSIS Library
bogdanm 0:9b334a45a8ff 2 *
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2006-2015 ARM Limited
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 *
bogdanm 0:9b334a45a8ff 12 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 13 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 14 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 15 *
bogdanm 0:9b334a45a8ff 16 * 3. Neither the name of the copyright holder nor the names of its contributors
bogdanm 0:9b334a45a8ff 17 * may be used to endorse or promote products derived from this software without
bogdanm 0:9b334a45a8ff 18 * specific prior written permission.
bogdanm 0:9b334a45a8ff 19 *
bogdanm 0:9b334a45a8ff 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
bogdanm 0:9b334a45a8ff 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
bogdanm 0:9b334a45a8ff 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
bogdanm 0:9b334a45a8ff 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
bogdanm 0:9b334a45a8ff 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
bogdanm 0:9b334a45a8ff 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
bogdanm 0:9b334a45a8ff 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
bogdanm 0:9b334a45a8ff 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
bogdanm 0:9b334a45a8ff 30 * POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 31 *******************************************************************************
bogdanm 0:9b334a45a8ff 32 * @file system_CMSDK_CM7.c
bogdanm 0:9b334a45a8ff 33 * @brief CMSIS Device System Source File for
bogdanm 0:9b334a45a8ff 34 * CMSDK_CM7 Device
bogdanm 0:9b334a45a8ff 35 * @version V1.00
bogdanm 0:9b334a45a8ff 36 * @date 27. August 2014
bogdanm 0:9b334a45a8ff 37 *
bogdanm 0:9b334a45a8ff 38 * @note
bogdanm 0:9b334a45a8ff 39 *
bogdanm 0:9b334a45a8ff 40 *******************************************************************************/
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 #if defined (CMSDK_CM7)
bogdanm 0:9b334a45a8ff 44 #include "CMSDK_CM7.h"
bogdanm 0:9b334a45a8ff 45 #elif defined (CMSDK_CM7_SP)
bogdanm 0:9b334a45a8ff 46 #include "CMSDK_CM7_SP.h"
bogdanm 0:9b334a45a8ff 47 #elif defined (CMSDK_CM7_DP)
bogdanm 0:9b334a45a8ff 48 #include "CMSDK_CM7_DP.h"
bogdanm 0:9b334a45a8ff 49 #else
bogdanm 0:9b334a45a8ff 50 #error device not specified!
bogdanm 0:9b334a45a8ff 51 #endif
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 /*----------------------------------------------------------------------------
bogdanm 0:9b334a45a8ff 54 Define clocks
bogdanm 0:9b334a45a8ff 55 *----------------------------------------------------------------------------*/
bogdanm 0:9b334a45a8ff 56 #define __XTAL (50000000UL) /* Oscillator frequency */
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 #define __SYSTEM_CLOCK (__XTAL / 2)
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 /*----------------------------------------------------------------------------
bogdanm 0:9b334a45a8ff 62 System Core Clock Variable
bogdanm 0:9b334a45a8ff 63 *----------------------------------------------------------------------------*/
bogdanm 0:9b334a45a8ff 64 uint32_t SystemCoreClock = __SYSTEM_CLOCK;/* System Core Clock Frequency */
bogdanm 0:9b334a45a8ff 65
bogdanm 0:9b334a45a8ff 66
bogdanm 0:9b334a45a8ff 67 /**
bogdanm 0:9b334a45a8ff 68 * Update SystemCoreClock variable
bogdanm 0:9b334a45a8ff 69 *
bogdanm 0:9b334a45a8ff 70 * @param none
bogdanm 0:9b334a45a8ff 71 * @return none
bogdanm 0:9b334a45a8ff 72 *
bogdanm 0:9b334a45a8ff 73 * @brief Updates the SystemCoreClock with current core Clock
bogdanm 0:9b334a45a8ff 74 * retrieved from cpu registers.
bogdanm 0:9b334a45a8ff 75 */
bogdanm 0:9b334a45a8ff 76 void SystemCoreClockUpdate (void)
bogdanm 0:9b334a45a8ff 77 {
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 SystemCoreClock = __SYSTEM_CLOCK;
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 }
bogdanm 0:9b334a45a8ff 82
bogdanm 0:9b334a45a8ff 83 /**
bogdanm 0:9b334a45a8ff 84 * Initialize the system
bogdanm 0:9b334a45a8ff 85 *
bogdanm 0:9b334a45a8ff 86 * @param none
bogdanm 0:9b334a45a8ff 87 * @return none
bogdanm 0:9b334a45a8ff 88 *
bogdanm 0:9b334a45a8ff 89 * @brief Setup the microcontroller system.
bogdanm 0:9b334a45a8ff 90 * Initialize the System.
bogdanm 0:9b334a45a8ff 91 */
bogdanm 0:9b334a45a8ff 92 void SystemInit (void)
bogdanm 0:9b334a45a8ff 93 {
bogdanm 0:9b334a45a8ff 94 #if (__FPU_USED == 1)
bogdanm 0:9b334a45a8ff 95 SCB->CPACR |= ((3UL << 10*2) | /* set CP10 Full Access */
bogdanm 0:9b334a45a8ff 96 (3UL << 11*2) ); /* set CP11 Full Access */
bogdanm 0:9b334a45a8ff 97 #endif
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 #ifdef UNALIGNED_SUPPORT_DISABLE
bogdanm 0:9b334a45a8ff 100 SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
bogdanm 0:9b334a45a8ff 101 #endif
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 SystemCoreClock = __SYSTEM_CLOCK;
bogdanm 0:9b334a45a8ff 104
bogdanm 0:9b334a45a8ff 105 }