static void reset_rtc_values( void )
{
ErrorStatus status;
/* Disable write protection of rtc registers */
RTC_WriteProtectionCmd(DISABLE);
status = RTC_EnterInitMode();
REFERENCE_DEBUG_ONLY_VARIABLE(status);
wiced_assert( "Rtc can not enter intialisation mode", status==SUCCESS );
/* Reset calendar date registers */
RTC->TR = 0;
RTC_ExitInitMode();
status = RTC_WaitForSynchro();
wiced_assert( "Rtc can not synchronize", status==SUCCESS );
/* Enable write protection of rtc registers */
RTC_WriteProtectionCmd(ENABLE);
/* Disable write protection of the rtc registers */
RTC_WriteProtectionCmd(DISABLE);
status = RTC_EnterInitMode();
wiced_assert( "Rtc can not enter intialisation mode", status==SUCCESS );
/* 2000 year 01/01 */
RTC->DR= 0;
RTC->DR= ( 1<<13 ) | ( 1<<8 ) | ( 1<<0 );
RTC_ExitInitMode();
status = RTC_WaitForSynchro();
wiced_assert( "Rtc can not synchronize", status==SUCCESS );
/* Enable write protection of rtc registers */
RTC_WriteProtectionCmd(ENABLE);
}
static void reset_rtc_values( void )
{
ErrorStatus status;
int retry = 3;
/* Disable write protection of rtc registers */
do{
RTC_WriteProtectionCmd(DISABLE);
status = RTC_EnterInitMode();
REFERENCE_DEBUG_ONLY_VARIABLE(status);
retry--;
}while( retry && (status!=SUCCESS) );
check_string( status==SUCCESS, "Rtc can not enter intialisation mode");
/* Reset calendar date registers */
RTC->TR = 0;
RTC_ExitInitMode();
status = RTC_WaitForSynchro();
check_string( status==SUCCESS, "Rtc can not synchronize" );
/* Enable write protection of rtc registers */
RTC_WriteProtectionCmd(ENABLE);
/* Disable write protection of the rtc registers */
RTC_WriteProtectionCmd(DISABLE);
status = RTC_EnterInitMode();
check_string( status==SUCCESS, "Rtc can not enter intialisation mode" );
/* 2000 year 01/01 */
RTC->DR= 0;
RTC->DR= ( 1<<13 ) | ( 1<<8 ) | ( 1<<0 );
RTC_ExitInitMode();
status = RTC_WaitForSynchro();
check_string(status==SUCCESS, "Rtc can not synchronize");
/* Enable write protection of rtc registers */
RTC_WriteProtectionCmd(ENABLE);
}
void RTC_Config(void)
{
RTC_InitTypeDef RTC_InitStructure;
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);
PWR_BackupAccessCmd(ENABLE);//使能备份寄存器操作
RCC_LSICmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET);
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
if(RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x9741) //一个变量，看看RTC初始化没
{
RTC_WriteProtectionCmd(DISABLE);
RTC_EnterInitMode();
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
RTC_InitStructure.RTC_AsynchPrediv = 0x7D-1;
RTC_InitStructure.RTC_SynchPrediv = 0xFF-1;
RTC_Init(&RTC_InitStructure);
RTC_TimeStructure.RTC_Seconds = 0x00;
RTC_TimeStructure.RTC_Minutes = 0x01;
RTC_TimeStructure.RTC_Hours = 0x01;
RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
RTC_SetTime(RTC_Format_BCD,&RTC_TimeStructure);
RTC_DateStructure.RTC_Date = 30;
RTC_DateStructure.RTC_Month = 5;
RTC_DateStructure.RTC_WeekDay= RTC_Weekday_Thursday;
RTC_DateStructure.RTC_Year = 12;
RTC_SetDate(RTC_Format_BCD,&RTC_DateStructure);
RTC_ExitInitMode();
RTC_WriteBackupRegister(RTC_BKP_DR0,0X9741);
RTC_WriteProtectionCmd(ENABLE);
RTC_WriteBackupRegister(RTC_BKP_DR0,0x9741); //初始化完成，设置标志
}
PWR_BackupAccessCmd(DISABLE);
}
static platform_result_t stm32f2_rtc_change_clock( rtc_clock_state_t* current, rtc_clock_state_t target )
{
uint8_t sync_div;
uint8_t async_div;
ErrorStatus status;
/* Changing the synchronous and asynchronous prescalers according to the current clocking state and target_clock_state */
/* of the RTC */
if( *current == CLOCKING_EVERY_SEC )
{
if( target == CLOCKING_EVERY_1p25MSEC )
{
sync_div = 0;
async_div= 40;
/* Disable write protection of rtc registers, now we will be able to update RTC register values */
RTC_WriteProtectionCmd(DISABLE);
/* Enable initialisation mode */
status = RTC_EnterInitMode();
REFERENCE_DEBUG_ONLY_VARIABLE(status);
wiced_assert( "Rtc can not enter intialisation mode", status==SUCCESS );
/* Update RTC prescaler */
RTC->PRER = (uint32_t)( sync_div );
RTC->PRER |= (uint32_t)(async_div << 16);
RTC_ExitInitMode();
/* Enable write proteciton of rtc registers back */
RTC_WriteProtectionCmd(ENABLE);
*current = CLOCKING_EVERY_1p25MSEC;
return PLATFORM_SUCCESS;
}
else
{
return PLATFORM_SUCCESS;
}
}
else if( *current == CLOCKING_EVERY_1p25MSEC )
{
if( target == CLOCKING_EVERY_SEC )
{
/* We will get approximately 800Hz clock, 1 tick will correspond to 1.25ms(0,00125s), by addind 8 together we will get 1ms */
/* the closest division factor which is 40.96( 32768/800 ), we will take 41, the error will be very very tiny */
async_div = 127;
sync_div = 255;
/* Disable write protection of rtc registers */
RTC_WriteProtectionCmd(DISABLE);
/* Enable initialisation mode */
status = RTC_EnterInitMode();
wiced_assert( "Rtc can not enter intialisation mode", status==SUCCESS );
/* Update RTC prescaler */
RTC->PRER = (uint32_t)( sync_div );
RTC->PRER |= (uint32_t)(async_div << 16);
RTC_ExitInitMode();
/* Enable write proteciton of rtc registers back */
RTC_WriteProtectionCmd(ENABLE);
*current = CLOCKING_EVERY_SEC;
return PLATFORM_SUCCESS;
}
else
{
return PLATFORM_SUCCESS;
}
}
return PLATFORM_SUCCESS;
}