50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
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/** @addtogroup crs_file CRS peripheral API
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* @ingroup peripheral_apis
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*
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* @brief <b>(USB) STM32 Clock Recovery Subsystem</b>
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*
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* @version 1.0.0
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*
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* @date 5 Feb 2014
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*
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* LGPL License Terms @ref lgpl_license
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/crs.h>
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#include <libopencm3/stm32/rcc.h>
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/**
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* This function enables automatic trimming of internal RC oscillator by USB SOF
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* frames
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*/
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void crs_autotrim_usb_enable(void)
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{
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rcc_periph_clock_enable(RCC_CRS);
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CRS_CFGR &= ~CRS_CFGR_SYNCSRC;
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CRS_CFGR |= CRS_CFGR_SYNCSRC_USB_SOF;
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CRS_CR |= CRS_CR_AUTOTRIMEN;
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CRS_CR |= CRS_CR_CEN;
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}
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/**@}*/
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