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/clocking.h@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 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file clocking.h
<> 144:ef7eb2e8f9f7 3 * @brief Clock selection calculations
<> 144:ef7eb2e8f9f7 4 *******************************************************************************
<> 144:ef7eb2e8f9f7 5 * @section License
<> 144:ef7eb2e8f9f7 6 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 7 *******************************************************************************
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 12 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 13 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 14 *
<> 144:ef7eb2e8f9f7 15 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 16 *
<> 144:ef7eb2e8f9f7 17 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 18 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 19 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 20 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 21 * limitations under the License.
<> 144:ef7eb2e8f9f7 22 *
<> 144:ef7eb2e8f9f7 23 ******************************************************************************/
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 #include "device_peripherals.h"
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 #if( CORE_CLOCK_SOURCE == HFXO)
<> 144:ef7eb2e8f9f7 28 # define REFERENCE_FREQUENCY HFXO_FREQUENCY
<> 144:ef7eb2e8f9f7 29 #elif( CORE_CLOCK_SOURCE == HFRCO)
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 # if defined _CMU_HFRCOCTRL_BAND_MASK
<> 144:ef7eb2e8f9f7 32 # if( HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_1MHZ)
<> 144:ef7eb2e8f9f7 33 # define REFERENCE_FREQUENCY 1000000
<> 144:ef7eb2e8f9f7 34 # elif(HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_7MHZ)
<> 144:ef7eb2e8f9f7 35 # define REFERENCE_FREQUENCY 7000000
<> 144:ef7eb2e8f9f7 36 # elif(HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_11MHZ)
<> 144:ef7eb2e8f9f7 37 # define REFERENCE_FREQUENCY 7000000
<> 144:ef7eb2e8f9f7 38 # elif(HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_14MHZ)
<> 144:ef7eb2e8f9f7 39 # define REFERENCE_FREQUENCY 14000000
<> 144:ef7eb2e8f9f7 40 # elif(HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_21MHZ)
<> 144:ef7eb2e8f9f7 41 # define REFERENCE_FREQUENCY 21000000
<> 144:ef7eb2e8f9f7 42 # elif(HFRCO_FREQUENCY == _CMU_HFRCOCTRL_BAND_28MHZ)
<> 144:ef7eb2e8f9f7 43 # define REFERENCE_FREQUENCY 28000000
<> 144:ef7eb2e8f9f7 44 # else
<> 144:ef7eb2e8f9f7 45 # define REFERENCE_FREQUENCY 14000000
<> 144:ef7eb2e8f9f7 46 # endif
<> 144:ef7eb2e8f9f7 47 # elif defined _CMU_HFRCOCTRL_FREQRANGE_MASK
<> 144:ef7eb2e8f9f7 48 # define REFERENCE_FREQUENCY HFRCO_FREQUENCY
<> 144:ef7eb2e8f9f7 49 # else
<> 144:ef7eb2e8f9f7 50 # error "HFRCO frequency not defined"
<> 144:ef7eb2e8f9f7 51 # endif
<> 144:ef7eb2e8f9f7 52 #endif
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 #if ( LOW_ENERGY_CLOCK_SOURCE == LFXO )
<> 144:ef7eb2e8f9f7 55 # define LEUART_USING_LFXO
<> 144:ef7eb2e8f9f7 56 # if ( (defined(CMU_CTRL_HFLE) || defined(CMU_CTRL_WSHFLE) ) && (REFERENCE_FREQUENCY > 24000000) )
<> 144:ef7eb2e8f9f7 57 # define LEUART_HF_REF_FREQ (REFERENCE_FREQUENCY / 4)
<> 144:ef7eb2e8f9f7 58 # else
<> 144:ef7eb2e8f9f7 59 # define LEUART_HF_REF_FREQ (REFERENCE_FREQUENCY / 2)
<> 144:ef7eb2e8f9f7 60 # endif
<> 144:ef7eb2e8f9f7 61 # define LEUART_LF_REF_FREQ LFXO_FREQUENCY
<> 144:ef7eb2e8f9f7 62 #else
<> 144:ef7eb2e8f9f7 63 # if ( (defined(CMU_CTRL_HFLE) || defined(CMU_CTRL_WSHFLE) ) && (REFERENCE_FREQUENCY > 24000000) )
<> 144:ef7eb2e8f9f7 64 # define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 4)
<> 144:ef7eb2e8f9f7 65 # else
<> 144:ef7eb2e8f9f7 66 # define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 2)
<> 144:ef7eb2e8f9f7 67 # endif
<> 144:ef7eb2e8f9f7 68 #endif
<> 144:ef7eb2e8f9f7 69