STM32 RTC时钟源LSE

1. 存器1的值为0XA5A5*/
2. BKP_WriteBackupRegister(BKP_DR1,RTC_SEQ_ID);
3. }else
4. {
5. /*CheckifthePowerOnResetflagisset*/
6. //RCC_GetFlagStatus(RCC_FLAG_PORRST)!=RESET
7. //printf("\r\n\nPowerOnResetoccurred....");
9. /*CheckifthePinResetflagisset*/
10. //elseif(RCC_GetFlagStatus(RCC_FLAG_PINRST)!=RESET)
11. //printf("\r\n\nExternalResetoccurred....");
12. if(RCC_GetFlagStatus(RCC_FLAG_LSERDY)==RESET)
13. {
14. //RCC->CSR|=0x1;//开启内部低速晶振
15. //while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY)==RESET);
16. //RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);//使用LSI提供RTC时钟
17. //RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);
18. RTC_Configuration();
19. }
20. //printf("\r\nNoneedtoconfigureRTC....");
21. /*WaitforRTCregisterssynchronization*/
22. RTC_WaitForSynchro();
24. /*EnabletheRTCSecond*/
25. RTC_ITConfig(RTC_IT_SEC,ENABLE);
27. /*WaituntillastwriteoperationonRTCregistershasfinished*/
28. RTC_WaitForLastTask();
29. }
31. #ifdefRTCClockOutput_Enable
32. /*EnablePWRandBKPclocks*/
33. RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR|RCC_APB1Periph_BKP,ENABLE);
35. /*AllowaccesstoBKPDomain*/
36. PWR_BackupAccessCmd(ENABLE);
38. /*DisabletheTamperPin*/
39. BKP_TamperPinCmd(DISABLE);/*TooutputRTCCLK/64onTamperpin,thetamper
40. functionalitymustbedisabled*/
42. /*EnableRTCClockOutputonTamperPin*/
43. BKP_RTCOutputConfig(BKP_RTCOutputSource_CalibClock);
44. #endif
46. /*Clearresetflags*/
47. RCC_ClearFlag();
48. }

万恶的LSE晶振，这东西简直不能忍受......