mirror of https://github.com/ARMmbed/mbed-os.git
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/***************************************************************************//**
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* @file clocking.h
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* @brief Clock selection calculations
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
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*******************************************************************************
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#ifndef MBED_CLOCKING_H
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#define MBED_CLOCKING_H
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/* Clock definitions */
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#define LFXO 0
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#define HFXO 1
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#define LFRCO 2
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#define HFRCO 3
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#if !defined(_EFM32_GECKO_FAMILY)
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#define ULFRCO 4
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#endif
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/* Low Energy peripheral clock source.
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* Options:
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* * LFXO: external crystal, please define frequency.
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* * LFRCO: internal RC oscillator (32.768kHz)
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* * ULFRCO: internal ultra-low power RC oscillator (available down to EM3) (1kHz)
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*/
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#ifndef LOW_ENERGY_CLOCK_SOURCE
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#define LOW_ENERGY_CLOCK_SOURCE LFXO
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#endif
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/** Core clock source.
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* Options:
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* * HFXO: external crystal, please define frequency.
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* * HFRCO: High-frequency internal RC oscillator. Please select band as well.
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*/
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#ifndef CORE_CLOCK_SOURCE
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#define CORE_CLOCK_SOURCE HFRCO
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#if defined(_CMU_HFRCOCTRL_BAND_MASK)
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#define HFRCO_FREQUENCY_ENUM _CMU_HFRCOCTRL_BAND_21MHZ
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#define HFRCO_FREQUENCY 21000000
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#elif defined(_CMU_HFRCOCTRL_FREQRANGE_MASK)
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#define HFRCO_FREQUENCY_ENUM cmuHFRCOFreq_32M0Hz
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#define HFRCO_FREQUENCY 32000000
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#endif
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#endif // CORE_CLOCK_SOURCE
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#if !defined(LFXO_FREQUENCY) && (LOW_ENERGY_CLOCK_SOURCE == LFXO)
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#error "LFXO frequency is undefined!"
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#endif
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#if !defined(HFXO_FREQUENCY) && (CORE_CLOCK_SOURCE == HFXO)
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#error "HFXO frequency is undefined!"
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#endif
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#if (LOW_ENERGY_CLOCK_SOURCE == LFXO)
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#define LOW_ENERGY_CLOCK_FREQUENCY LFXO_FREQUENCY
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#elif (LOW_ENERGY_CLOCK_SOURCE == LFRCO)
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#define LOW_ENERGY_CLOCK_FREQUENCY 32768
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#elif (LOW_ENERGY_CLOCK_SOURCE == ULFRCO)
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#define LOW_ENERGY_CLOCK_FREQUENCY 1000
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#else
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#error "Unknown Low Energy Clock selection"
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#endif
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#if( CORE_CLOCK_SOURCE == HFXO)
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# define REFERENCE_FREQUENCY HFXO_FREQUENCY
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#elif( CORE_CLOCK_SOURCE == HFRCO)
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#if !defined(HFRCO_FREQUENCY)
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# error "HFRCO frequency is not defined!"
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#else
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# define REFERENCE_FREQUENCY HFRCO_FREQUENCY
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#endif
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#endif
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#if ( LOW_ENERGY_CLOCK_SOURCE == LFXO )
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# define LEUART_USING_LFXO
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# if ( (defined(CMU_CTRL_HFLE) || defined(CMU_CTRL_WSHFLE) ) && (REFERENCE_FREQUENCY > 24000000) )
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# define LEUART_HF_REF_FREQ (REFERENCE_FREQUENCY / 4)
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# else
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# define LEUART_HF_REF_FREQ (REFERENCE_FREQUENCY / 2)
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# endif
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# define LEUART_LF_REF_FREQ LFXO_FREQUENCY
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#else
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# if ( (defined(CMU_CTRL_HFLE) || defined(CMU_CTRL_WSHFLE) ) && (REFERENCE_FREQUENCY > 24000000) )
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# define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 4)
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# else
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# define LEUART_REF_FREQ (REFERENCE_FREQUENCY / 2)
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# endif
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#endif
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#endif
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