Programming Code

[jameschia]

I am using MPLAB, HI TECH compiler for a project.
This project require me to display some word on LCD and I got some question in the following code:

/* write a number of integer to the LCD */
void lcd_number(unsigned int no, char base, char digit)
{
char i,di[10];
for(i=0;i<=9;i++)
di=0;
i=0;
do
{
di=no%base;
no=no/base;
i++;
}
while(no!=0);
for(i=digit;i>0;i--)
{
if(di[i-1]<=9)
lcd_write(i-1,'0');
else
lcd_write(i-1-10,'A');
}
}


what is the purpose of "lcd_write(i-1,'0');" and "lcd_write(i-1,'A');"?
what does the 'O' and 'A' stand for?
why do it use 'O' and 'A', but not straight away display the digit in that variable?
any idea?

 

[Pommie]

Here is the same code but indented and commented,

/* write a number of integer to the LCD */
void lcd_number(unsigned int no, char base, char digit){
    char i,di[10];
    for(i=0;i<=9;i++)			//clear array di
        di[i]=0;
    i=0;
    do{
        di[i]=no%base;			//generate digits
        no=no/base;
        i++;
    }while(no!=0);
    for(i=digit;i>0;i--){		//display digits backward
        if(di[i-1]<=9) 
            lcd_write(i-1,'0');		//display "0" to "9"
        else
            lcd_write(i-1-10,'A');	//display "A" to "F"
    }
}

I'm guessing that '0' and 'A' are the base character. So if di[x] = 0 to 9 it displays "0" to "9" and if it's 10 to 15 it displays "A" to "F".

HTH.

Mike.

 

[jameschia]

oic. thanks a lot.