1 | void init()
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2 | {
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3 | /* Enable the PWR clock */
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4 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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5 |
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6 | /* Allow access to RTC */
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7 | PWR_BackupAccessCmd(ENABLE);
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8 |
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9 | /* Enable the LSI OSC */
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10 | RCC_LSICmd(ENABLE);
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11 |
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12 | /* Wait till LSI is ready */
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13 | while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
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14 | {
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15 | }
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16 |
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17 | /* Select the RTC Clock Source */
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18 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
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19 |
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20 |
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21 | /* Configure the RTC data register and RTC prescaler */
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22 | RTC_InitTypeDef RTC_InitStructure;
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23 | RTC_InitStructure.RTC_AsynchPrediv = 0x7F; // prescaler set to optain a 1 Hz signal of the 32kHz LSI
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24 | RTC_InitStructure.RTC_SynchPrediv = 0xFF; // prescaler set to optain a 1 Hz signal of the 32kHz LSI
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25 | RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
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26 |
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27 | /* Check on RTC init */
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28 | if (RTC_Init(&RTC_InitStructure) == ERROR)
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29 | {
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30 | return;
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31 | }
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32 |
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33 | /* Enable the RTC Clock */
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34 | RCC_RTCCLKCmd(ENABLE);
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35 |
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36 | /* Wait for RTC APB registers synchronisation */
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37 | RTC_WaitForSynchro();
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38 |
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39 | rtc_InitWakeUpInterrupt(16);
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40 |
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41 | }
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42 |
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43 | void rtc_InitWakeUpInterrupt(uint8_t wakeUpCounter)
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44 | {
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45 | NVIC_InitTypeDef NVIC_InitStructure;
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46 | EXTI_InitTypeDef EXTI_InitStructure;
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47 |
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48 | // NVIC init
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49 | NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn;
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50 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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51 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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52 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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53 | NVIC_Init(&NVIC_InitStructure);
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54 |
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55 | // ext Interrupt 22 einstellen (fuer WakeUp)
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56 | EXTI_ClearITPendingBit(EXTI_Line22);
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57 | EXTI_InitStructure.EXTI_Line = EXTI_Line22;
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58 | EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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59 | EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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60 | EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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61 | EXTI_Init(&EXTI_InitStructure);
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62 |
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63 | // zum einstellen muss Wakup disabled sein
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64 | RTC_WakeUpCmd(DISABLE);
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65 |
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66 | // Teiler 16 => 32,768kHz:16 => 2048 Hz
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67 | RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);
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68 | // WakeUp Counter einstellen
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69 | RTC_SetWakeUpCounter(wakeUpCounter); //set to 16 -> 128 interrupts per second (32768Hz / Div16 = 2048; 2048 / 128 = 16
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70 |
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71 | // enable Interrupt
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72 | RTC_ITConfig(RTC_IT_WUT, ENABLE);
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73 |
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74 | // enable Wakeup
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75 | RTC_WakeUpCmd(ENABLE);
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76 | }
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77 |
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78 | void RTC_WKUP_IRQHandler(void)
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79 | {
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80 | if(RTC_GetITStatus(RTC_IT_WUT) != RESET)
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81 | {
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82 | // Interrupt Flags loeschen
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83 | EXTI_ClearITPendingBit(EXTI_Line22);
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84 | RTC_ClearITPendingBit(RTC_IT_WUT);
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85 |
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86 |
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87 | doSomething();
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88 |
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89 | }
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90 | }
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