标题:
stm32 RTC_WaitForSynchro()死循环
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作者:
look_w
时间:
2017-10-24 17:58
标题:
stm32 RTC_WaitForSynchro()死循环
1.RTC_WaitForSynchro()死循环，发现是没有执行RTC_Configuration(),增加函数，但不知道对之后的时钟准确性有什么影响
/*******************************************************************************
* Function Name : RTC_Configuration
* Description : Configures the RTC.
* Input : None
* Output : None
* Return : 0 reday,-1 error.
*******************************************************************************/
int
RTC_Configuration
(
void
)
{
u32
countmax
=
0x20000
;
u32
count
=
countmax
;
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd
(
RCC_APB1Periph_PWR
|
RCC_APB1Periph_BKP
,
ENABLE
);
/* Allow access to BKP Domain */
PWR_BackupAccessCmd
(
ENABLE
);
/* Reset Backup Domain */
BKP_DeInit
();
/* Enable LSE */
RCC_LSEConfig
(
RCC_LSE_ON
);
/* Wait till LSE is ready */
while
((
RCC_GetFlagStatus
(
RCC_FLAG_LSERDY
)
==
RESET
)
&&
(
--
count
)
);
if
(
count
==
0
)
{
count
=
countmax
;
//关闭外部低速晶振（LSE）
RCC_LSEConfig
(
RCC_LSE_OFF
);
//如果失败，使用内部晶振
//使能或者失能内部低速晶振（LSI）
RCC_LSICmd
(
ENABLE
);
//设置RTC时钟（RTCCLK）
RCC_RTCCLKConfig
(
RCC_RTCCLKSource_LSI
);
/* Wait till LSI is ready */
while
((
RCC_GetFlagStatus
(
RCC_FLAG_LSIRDY
)
==
RESET
)
&&
(
--
count
)
);
if
(
count
==
0
)
return
1
;
}
else
{
/* Select LSE as RTC Clock Source */
RCC_RTCCLKConfig
(
RCC_RTCCLKSource_LSE
);
//设置RTC时钟（RTCCLK）
}
/* Enable RTC Clock */
RCC_RTCCLKCmd
(
ENABLE
);
/* Wait for RTC registers synchronization */
RTC_WaitForSynchro
();
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask
();
/* Set RTC prescaler: set RTC period to 1sec */
RTC_SetPrescaler
(
32767
);
/* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask
();
return
0
;
}
void
rt_hw_rtc_init
(
void
)
{
rtc
.
type
=
RT_Device_Class_RTC
;
if
(
BKP_ReadBackupRegister
(
BKP_DR1
)
!=
0xA5A5
)
{
rt_kprintf
(
"rtc is not configured\n"
);
rt_kprintf
(
"please configure with set_date and set_time\n"
);
if
(
RTC_Configuration
()
!=
0
)
{
rt_kprintf
(
"rtc configure fail...\r\n"
);
return
;
}
}
else
{
if
(
RTC_Configuration
()
!=
0
)
{
rt_kprintf
(
"rtc configure fail...\r\n"
);
return
;
}
/* Wait for RTC registers synchronization */
RTC_WaitForSynchro
();
}
/* register rtc device */
rtc
.
init
=
RT_NULL
;
rtc
.
open
=
rt_rtc_open
;
rtc
.
close
=
RT_NULL
;
rtc
.
read
=
rt_rtc_read
;
rtc
.
write
=
RT_NULL
;
rtc
.
control
=
rt_rtc_control
;
/* no private */
rtc
.
user_data
=
RT_NULL
;
rt_device_register
(&
rtc
,
"rtc"
,
RT_DEVICE_FLAG_RDWR
);
return
;
}
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