LPC2134 Learning Log (Part 2) -- LCD12864 Clock

These two weeks seem to be a bit busy, making Lazy Cat physically and mentally exhausted, and sometimes even unable to help but get angry with others. Lazy Cat is very sorry for this, and I would like to say sorry here, and hope you can understand. Well, no matter how busy I am, Lazy Cat must find time to learn something. As the old saying goes, learning is like sailing, if you don't advance, you will retreat. Although Lazy Cat loves to fly, he has not learned to fly yet, so for Lazy Cat's dream of traveling around the world, Lazy Cat must work hard and work hard again!

Well, okay, without further ado, I took the time these days to write based on the previous blog, and added some things to make a real-time clock. Of course, the functions are not complete yet, there is no function to adjust the time, no timing function, and there is no function to add a menu on LCD12864... Anyway, this is the simplest real-time clock. The main purpose is to learn about the RTC inside LPC2134. Although the program can run, there is a small BUG during simulation, that is, the second value is updated only once every 3 seconds, which makes the lazy cat very depressed. I have been searching for the reason for a long time but have not found it. However, the lazy cat did not give up and kept looking until it was eliminated. If you have written a program in this area, you can also guide the lazy cat. The lazy cat will be very grateful. Thank you very much.

OK, here is the interface diagram for this simulation. I would like to emphasize that this is only used for simulation in Proteus and cannot be used for actual welding:

Figure 1-1  Simulation circuit diagram

Since this real-time clock is modified based on the previous log "LPC2134 Learning Log  -  Learning to Use LCD12864", only two files, Clock.h and Clock.c, are added. The advantage of adding this is modular programming, but if it is not used, it can be deleted directly, and the template does not need to be changed back and forth. The following is the content of CLOCK.H:

 

 

//File name: Clock.h

//    Function : some functions about timer

//    Author : Lazy Cat Loves to Fly

//    Note  : MCU      -- LPC2134

//           Crystal   -- 12MHz

//           RTC       -- 32.768KHz  

//           Development environment--  RealView MDK-ARM Verxion 4.12

 

#ifndef __CLOCK_H__

#define __CLOCK_H__

 

#include "config.h"

 

#define RTC_NUM 13

#define T0_NUM 4  

 

 

struct {

        uint8 second;   //  Record  seconds

        uint8 minute;   //  Record  minutes

        uint8 hour;     //  Record  time

                  uint8 year;     //  Record  year

                  uint8 month;    //  Record  month

                  uint8 day;      //  Record  day

                  uint8 week;     //  Record  the week

       } current_time,pre_time;

 

#define Cur_Sec    current_time.second

#define Cur_Min    current_time.minute

#define Cur_Hour   current_time.hour

#define Cur_Year   current_time.year

#define Cur_Month current_time.month

#define Cur_Day    current_time.day

#define Cur_Week   current_time.week

 

#define Pre_Sec    pre_time.second

#define Pre_Min    pre_time.minute

#define Pre_Hour   pre_time.hour

#define Pre_Year   pre_time.year

#define Pre_Month pre_time.month

#define Pre_Day    pre_time.day

#define Pre_Week   pre_time.week

 

struct {

        uint32 timet;   //  Read the current time from the register

        uint32 datet;   //  Read the date from the current register

       } rtc_time;

 

#define Timet   rtc_time.timet

#define Datet   rtc_time.datet

 

BOOL t0flag;                         //  Timer flag

BOOL secflag;           //  Seconds flag

BOOL dotflag;           //  The colon between minutes and seconds displays the flag

 

extern void RTC_Init(void);     //RTC initialization

extern void Timer0_Init(void); //  Timer 0 initialization

extern void T0_Process(void);   //  Timer 0 processing program

extern void Updata_Time(void); //  Update time

 

#endif

This file mainly declares some global variables and some functions related to writing RTC and timer, among which BOOL

This data type is customized by me and is declared as follows in config.h:

//Define binary variables using union

typedef enum

{

    FALSE = 0,

    TRUE   = 1,

} BOOL;

The following functions are called in the main function, so the keyword extern must be added. I will not post the contents of the Clock.c file here, as it is a bit long. If you are interested, you can refer to the attachment, which contains source code and project files. The compilation environment is MDK4.12. Here I would also like to talk about the Show_Time (uint8 svalue, uint vposi) function. This function is used to display the corresponding position on the LCD after updating the data. One thing to note is that you must clear that position to 0 before redisplaying, otherwise garbled characters will appear. As shown in the following program:

 

void Show_Time(uint8 svalue,uint8 vposi)

{

   uint8 i = 0;

   uint8 hb = 0; //  Storage time tens digit

   uint8 lb = 0; //  Store time units

   hb = svalue;

   for(i=0;i<2;i++)

   {    

      lb = hb;

      hb /= 10;

      Show_Num(6,timeposi[i+vposi],10);   //  Clear the position where the data is updated, otherwise garbled characters may appear

      Show_Num(6,timeposi[i+vposi],lb);

   }

}

 

OK, that's all I have to summarize for now. It's time to get back to work. Otherwise, my boss might think I'm playing around again. I'll check for bugs when I get home tonight.