Urgent Help! - Displaying a changing number from a register on a 7 seg display

[Calbar]

Hi All,


This is probably quite trivial, but I am currently making a simple game using MpLab and it is my first time programming.

I am trying to create a 'lives' counter, so that every time a question is answered wrong, a life is taken away and then the new life number is displayed on a 7 seg.

I am using a 16F628 PIC and hyperterminal as the interface with a Max232 in the circuit.

I have been told that I need to create a new register, which has been done, and then apparently I need to give this register a value, to which 1 is taken away everytime a wrong answer is given. Once this is done, I then want to display what is in the register, onto the 7 seg display. I want to start with 9 lives, and go down to 0.


Hope this makes sense and is possible


Cheers

Calbar

 

[MahmoudHassan]

// Lcd pinout settings
sbit LCD_RS at Rd4_bit;
sbit LCD_EN at Rd5_bit;
sbit LCD_D7 at RD3_bit;
sbit LCD_D6 at Rd2_bit;
sbit LCD_D5 at Rd1_bit;
sbit LCD_D4 at Rd0_bit;

// Pin direction
sbit LCD_RS_Direction at TRISd4_bit;
sbit LCD_EN_Direction at TRISd5_bit;
sbit LCD_D7_Direction at TRISd3_bit;
sbit LCD_D6_Direction at TRISd2_bit;
sbit LCD_D5_Direction at TRISd1_bit;
sbit LCD_D4_Direction at TRISd0_bit;

void main() {
unsigned int x=0;
unsigned char hundreds,tens,ones,rem;
lcd_init();
lcd_out(1,1,"TEXT:");
lcd_out(1,10,"deg c");
for(;
{
if(RB0_bit==0)
{
delay_ms(10);
if(RB0_bit==0)
{
x++; // variable it's value changed by clicking a button making counting
hundreds = x/100;
lcd_chr(1,7,0x30+hundreds); // divide number
rem = x%100;
tens =rem/10;
ones=tens%10;
lcd_chr(1,8,0x30+tens);
lcd_chr(1,9,0x30+ones);
if(x==999)
{
x=0;
}
for(;RB0_bit==0
{}
}

}
if(RB1_bit==0)
{
delay_ms(10);
if(RB1_bit==0)
{
x--;
hundreds = x/100;
lcd_chr(1,7,0x30+hundreds); //displayying it in hex
rem = x%100;
tens =rem/10;
ones=tens%10;
lcd_chr(1,8,0x30+tens);
lcd_chr(1,9,0x30+ones);
if(x==999)
{
x=0;
}
for(;RB1_bit==0
{}

}

}


}

}

this program reads number and then display it as i think
i programmed it a long time ago , i can't remember it's exact objective but the lines commented above is the same as you want i think except that it written in C

 

[Calbar]

Thanks for the rapid response, but i need the code so that it can be used in MpLab.

I think i need something like: 'decf REGISTER_LIVES,F' in the text to tell it to subtract from the register, and also:

movlw .9 ;.9 needs to be changed
movwf REGISTER_L


so that 9 lives are put in the literal register, then moved to the working register. Or something alone those lines

 

[MahmoudHassan]

x--;
hundreds = x/100;
lcd_chr(1,7,0x30+hundreds); //displayying it in hex
rem = x%100;
tens =rem/10;
ones=tens%10;
lcd_chr(1,8,0x30+tens);
lcd_chr(1,9,0x30+ones);


i didn't use mplab but the idea is that i have a variable called X that incremented or decremented by two push buttons and to display it
i used function lcd_chr() it used to display a character you of course will find something like it in your compiler library in mplab
i put variable hundreds and then sum 0x30 or 30 hexadecimal number so that it can be displayed in ASCII
hope to be helpful