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LCD menu with keypad

 
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bearzalk



Joined: 19 Nov 2019
Posts: 2

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LCD menu with keypad
PostPosted: Tue Nov 19, 2019 12:48 am     Reply with quote
I have a problem with my menu integration. I am currently using keypad to switch menu sections like when I press 'A' on keypad go to a sub-menu or press 'B' to go another sub-menu, when I press '*' inside of these sub-menus then go back to main menu.
I don't have any problem about going to sub-menus when program started but after I press '*' to go to main menu, I can't go back to any of sub-menus.

The code is as following:
Code:

char K;

char T;

void MainMenu()
{
   do
   {
   K = kbd_getc();
   T = K - 48;
   lcd_gotoxy(1,1);
   printf(lcd_putc,"A)MOD B)SET HOUR");
   delay_ms(5);
   if((K=='A') || (K=='B') ||(K=='C') || (K=='D'))
   {
   printf(lcd_putc,"\f U is zero now");
   U=0;
   }
   }while(U==1);
}

void AltMod()
{
lcd_gotoxy(21,1);
printf(lcd_putc, "\fPRESS * FOR MAIN MENU\n");
delay_ms(5);

lcd_gotoxy(1,2);
printf(lcd_putc,"ENTER NUM=>\n");
}

void AltModRun()
{
do
  {
   K = kbd_getc();
   T = K - 48;
   if((K!=0) && (K!='A') && (K!='B') && (K!='C') && (K!='D')&& (K != '*') && (K != '#'))
    {
     A = (A*10) + T;
     //Don't add Y=20 here, it resets it to 20 in every cycle
     Y++;
     lcd_gotoxy(Y,1);
     printf(lcd_putc,"PRESS # FOR SUBMIT %d",T);
     delay_ms(5);
    }
   if(K=='#')
    {
     num= A;
     lcd_gotoxy(21,2);
     printf(lcd_putc,"%d NUM IS CHOSEN", num);
     delay_ms(5);
    }

   if(K == '*')
   {
   printf(lcd_putc,"\fINSIDE MOD STAR");
   Y=20;
   Z=0;
   A=0;
   }
}while(Z==1);


void main()
{
kbd_init();
   
port_b_pullups(true);

set_tris_b(0xF0);

rtc_init();
lcd_init();
MainMenu();//To display Main menu when program starts

while(true)
{
K = kbd_getc();
T = K - 48;

switch(K)
{
case 'D':
Z=1;
AltMod();
AltModRun();
break;

case '*':
U=1;
printf(lcd_putc, "\fINSIDE CASE STAR");
//MainMenu();
break;
}
}
}

If there is only printf inside case '*' then program works as I want, but when I comment out the printf and put MainMenu(); in there then it doesn't go to anywhere after I press '*', it keeps displaying main menu.

In program's first execution, when I press 'D' then it goes to sub menu, when I press * it goes back to main menu but while in main menu it doesn't go to sub menu when I press A,B,C or D, it only goes to sub menu when I press one of these keys around 20 times.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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Re: LCD menu with keypad
PostPosted: Wed Nov 20, 2019 7:55 am     Reply with quote
bearzalk wrote:

it only goes to sub menu when I press one of these keys around 20 times.

This sounds like a problem with your usage of the kbd_getc() function.

The program in this post shows how to use a timer interrupt to call
the kbd_getc() function every 10 ms.
http://www.ccsinfo.com/forum/viewtopic.php?t=42707&start=4
bearzalk



Joined: 19 Nov 2019
Posts: 2

View user's profile Send private message

Re: LCD menu with keypad
PostPosted: Wed Nov 20, 2019 8:51 am     Reply with quote
PCM programmer wrote:
bearzalk wrote:

it only goes to sub menu when I press one of these keys around 20 times.

This sounds like a problem with your usage of the kbd_getc() function.

The program in this post shows how to use a timer interrupt to call
the kbd_getc() function every 10 ms.
http://www.ccsinfo.com/forum/viewtopic.php?t=42707&start=4


Thanks a lot for reply, I'll try this. Just a quick question, why does it work when there is only printf in case '*' and can you check this topic sometimes because I'll update the status after I try your solution, I'd like to get your help if this solution does not work.
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