STM32f4 RTC Alarm with LCD

[haythem]

Posted on June 19, 2014 at 17:40

HI, i want to configure the RTC alarm with LCD, to goal is to display the time in a LCD. I set the LCD and RTC but I do not know commant display the time on the LCD

This is my code to configure the RTC alarm

1. void RTC_Config(void)
2. {
3. RTC_TimeTypeDef RTC_TimeStructure;
4. RTC_InitTypeDef RTC_InitStructure;
5.   /* Enable the PWR clock */
6.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
7.   /* Allow access to RTC */
8.   //PWR_BackupAccessCmd(ENABLE);
9.   /* Reset RTC Domain */
10.   RCC_BackupResetCmd(ENABLE);
11.   RCC_BackupResetCmd(DISABLE);
12.   /* Enable the LSE OSC */
13.   RCC_LSEConfig(RCC_LSE_ON);
14.   /* Wait till LSE is ready */  
15.   while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
16.   {
17.   }
18.   /* Select the RTC Clock Source */
19.   RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
20.   /* Define the RCC with hours */
21.   RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
22.   RTC_InitStructure.RTC_SynchPrediv  = 0xFF;
23.   RTC_InitStructure.RTC_HourFormat   = RTC_HourFormat_24;
24.   RTC_Init(&RTC_InitStructure);
25.   
26.   /* Define time to 00h 00mn 00s AM */
27.   RTC_TimeStructure.RTC_H12     = RTC_H12_AM;
28.   RTC_TimeStructure.RTC_Hours   = 0x00;  //0 h
29.   RTC_TimeStructure.RTC_Minutes = 0x00;  //0 Minutes
30.   RTC_TimeStructure.RTC_Seconds = 0x00;  // Secands
31.   RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
32.   
33. }
34. void RTC_AlarmConfig(void)
35. {
36.   EXTI_InitTypeDef EXTI_InitStructure;
37.   RTC_AlarmTypeDef RTC_AlarmStructure;
38.   NVIC_InitTypeDef NVIC_InitStructure;
39.   
40.   /* EXTI configuration */
41.   EXTI_ClearITPendingBit(EXTI_Line17);
42.   EXTI_InitStructure.EXTI_Line = EXTI_Line17;
43.   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
44.   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
45.   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
46.   EXTI_Init(&EXTI_InitStructure);
47.   
48.   /* Enable the RTC Alarm Interrupt */
49.   NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
50.   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
51.   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
52.   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
53.   NVIC_Init(&NVIC_InitStructure);
54.  
55.   /* Set the alarmA Masks */
56.   RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_All;
57.   RTC_SetAlarm(RTC_Format_BCD, RTC_Alarm_A, &RTC_AlarmStructure);
58.   
59.   /* Set AlarmA subseconds and enable SubSec Alarm : generate 8 interripts per Second */
60.   RTC_AlarmSubSecondConfig(RTC_Alarm_A, 0xFF, RTC_AlarmSubSecondMask_SS14_5);
61.   /* Enable AlarmA interrupt */
62.   RTC_ITConfig(RTC_IT_ALRA, ENABLE);
63. }

[haythem]

Posted on June 22, 2014 at 17:34

Thank you for your help it was very useful. 

[haythem]

Posted on June 24, 2014 at 03:50

Naw I want to display a float that I calculated from the time, but the problem is that 16 * 2 LCD displays nothing

1. float total;
2. int S=0x00;
3. int M=0x00;
4. int H=0x00;
5. char totallcd[16];
6. void read_time(void)
7. {
8.   RTC_GetTime(RTC_Format_BCD, &RTC_TimeStructure);
9.  
10.    H=RTC_TimeStructure.RTC_Hours;
11.    M=RTC_TimeStructure.RTC_Minutes;
12.    S=RTC_TimeStructure.RTC_Seconds;
13. }
14. void total_reac(void)
15. { read_time();
16. total=S*0.0012+M*0.072+H*4.32;
17. sprintf(totallcd,''%d'',total);
18. }
19.  
20. float total;
21. int S=0x00;
22. int M=0x00;
23. int H=0x00;
24. char totallcd[16];
25.  
26. void read_time(void)
27. {
28.   RTC_GetTime(RTC_Format_BCD, &RTC_TimeStructure);
29.  
30.    H=RTC_TimeStructure.RTC_Hours;
31.    M=RTC_TimeStructure.RTC_Minutes;
32.    S=RTC_TimeStructure.RTC_Seconds;  
33.                
34. }
35. void total_reac(void)
36. {              read_time();
37.                 total=S*0.0012+M*0.072+H*4.32;
38.                 

    sprintf(totallcd,''%d'',total);

39.                
40. }
41.  
42.  
43. float total;
44. int S=0x00;
45. int M=0x00;
46. int H=0x00;
47. char totallcd[16];
48.  
49. void read_time(void)
50. {
51.   RTC_GetTime(RTC_Format_BCD, &RTC_TimeStructure);
52.  
53.    H=RTC_TimeStructure.RTC_Hours;
54.    M=RTC_TimeStructure.RTC_Minutes;
55.    S=RTC_TimeStructure.RTC_Seconds;  
56.                
57. }
58. void total_reac(void)
59. {              read_time();
60.                 total=S*0.0012+M*0.072+H*4.32;
61.                 

    sprintf(totallcd,''%d'',total);

62.                
63. }

[Tesla DeLorean]

Posted on June 24, 2014 at 05:31

Now I want to display a float that I calculated from the time, but the problem is that 16 * 2 LCD displays nothing

And you're sending it to the display where exactly?

LCD_Print()

[Trev]

Posted on June 24, 2014 at 10:17

Surely instead of

sprintf(totallcd,''%d'',total);you should be usingsprintf(totallcd,''%f'',total);for a float.Clives question also applies.