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[STM32F0] add support of autotrimming HSI to USB SOF frames

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Signed-off-by: Frantisek Burian <BuFran@seznam.cz>
This commit is contained in:
Kuldeep Singh Dhaka 2014-03-20 22:55:31 +01:00 committed by Frantisek Burian
parent 3974e5f48d
commit 331acce4fc
3 changed files with 18 additions and 1 deletions
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2
include/libopencm3/stm32/f0/crs.h
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@ -125,6 +125,8 @@
BEGIN_DECLS
void crs_autotrim_usb_enable(void);
END_DECLS
/**@}*/

2
lib/stm32/f0/Makefile
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@ -41,7 +41,7 @@ OBJS += gpio_common_all.o gpio_common_f0234.o crc_common_all.o \
pwr_common_all.o iwdg_common_all.o rtc_common_l1f024.o \
dma_common_l1f013.o exti_common_all.o spi_common_all.o \
spi_common_f03.o flash_common_f01.o dac_common_all.o \
timer_common_all.o rcc_common_all.o
timer_common_all.o rcc_common_all.o crs.o
VPATH += ../../usb:../:../../cm3:../common

15
lib/stm32/f0/crs.c
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@ -29,4 +29,19 @@
*/
#include <libopencm3/stm32/crs.h>
#include <libopencm3/stm32/rcc.h>
/**
* This function enables autonatic 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;
}