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_M3/system_CMSDK_CM3.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* MPS2 CMSIS Library
<> 144:ef7eb2e8f9f7 2 *
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2006-2016 ARM Limited
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 *
<> 144:ef7eb2e8f9f7 12 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 13 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 14 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * 3. Neither the name of the copyright holder nor the names of its contributors
<> 144:ef7eb2e8f9f7 17 * may be used to endorse or promote products derived from this software without
<> 144:ef7eb2e8f9f7 18 * specific prior written permission.
<> 144:ef7eb2e8f9f7 19 *
<> 144:ef7eb2e8f9f7 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
<> 144:ef7eb2e8f9f7 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
<> 144:ef7eb2e8f9f7 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
<> 144:ef7eb2e8f9f7 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
<> 144:ef7eb2e8f9f7 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
<> 144:ef7eb2e8f9f7 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
<> 144:ef7eb2e8f9f7 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
<> 144:ef7eb2e8f9f7 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
<> 144:ef7eb2e8f9f7 30 * POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 31 *******************************************************************************
<> 144:ef7eb2e8f9f7 32 * @file system_CMSDK_CM3.c
<> 144:ef7eb2e8f9f7 33 * @brief CMSIS Device System Source File for
<> 144:ef7eb2e8f9f7 34 * CMSDK_M3 Device
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 *******************************************************************************/
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 #include "CMSDK_CM3.h"
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 /*----------------------------------------------------------------------------
<> 144:ef7eb2e8f9f7 43 Define clocks
<> 144:ef7eb2e8f9f7 44 *----------------------------------------------------------------------------*/
<> 144:ef7eb2e8f9f7 45 #define __XTAL (50000000UL) /* Oscillator frequency */
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 #define __SYSTEM_CLOCK (__XTAL / 2)
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 /*----------------------------------------------------------------------------
<> 144:ef7eb2e8f9f7 51 Clock Variable definitions
<> 144:ef7eb2e8f9f7 52 *----------------------------------------------------------------------------*/
<> 144:ef7eb2e8f9f7 53 uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 /*----------------------------------------------------------------------------
<> 144:ef7eb2e8f9f7 57 Clock functions
<> 144:ef7eb2e8f9f7 58 *----------------------------------------------------------------------------*/
<> 144:ef7eb2e8f9f7 59 /**
<> 144:ef7eb2e8f9f7 60 * Update SystemCoreClock variable
<> 144:ef7eb2e8f9f7 61 *
<> 144:ef7eb2e8f9f7 62 * @param none
<> 144:ef7eb2e8f9f7 63 * @return none
<> 144:ef7eb2e8f9f7 64 *
<> 144:ef7eb2e8f9f7 65 * @brief Updates the SystemCoreClock with current core Clock
<> 144:ef7eb2e8f9f7 66 * retrieved from cpu registers.
<> 144:ef7eb2e8f9f7 67 */
<> 144:ef7eb2e8f9f7 68 void SystemCoreClockUpdate (void)
<> 144:ef7eb2e8f9f7 69 {
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 SystemCoreClock = __SYSTEM_CLOCK;
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 /**
<> 144:ef7eb2e8f9f7 76 * Initialize the system
<> 144:ef7eb2e8f9f7 77 *
<> 144:ef7eb2e8f9f7 78 * @param none
<> 144:ef7eb2e8f9f7 79 * @return none
<> 144:ef7eb2e8f9f7 80 *
<> 144:ef7eb2e8f9f7 81 * @brief Setup the microcontroller system.
<> 144:ef7eb2e8f9f7 82 * Initialize the System.
<> 144:ef7eb2e8f9f7 83 */
<> 144:ef7eb2e8f9f7 84 void SystemInit (void)
<> 144:ef7eb2e8f9f7 85 {
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 #ifdef UNALIGNED_SUPPORT_DISABLE
<> 144:ef7eb2e8f9f7 88 SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
<> 144:ef7eb2e8f9f7 89 #endif
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 SystemCoreClock = __SYSTEM_CLOCK;
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 }