lora-car/libopencm3/lib/stm32/common/crs_common_all.c

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