Want Help about coding the 16*2 interfacing to lcd for sending the numeric data

[awais]

This is code to send numeric data on 16*2 lcd using the 8051 plz explain it

void lcd_data(unsigned int i)     //Function to send data on LCD

{   int p;

int k=0;

while(i>0)

{

num[k]=i%10;

i=i/10;

k++;

}

k--;

for (p=k;p>=0;p--)

{

c=num[p]+48;

lcd_data_pin = c;

rw = 0;

rs = 1;

en = 1;

delay(1);

en = 0;

}

return;

}

[AJISH ALFRED]

Hi Awais,

I can give you some clues regarding the logic used,

 

These two lines are the key,

 num[k]=i%10;

This will store the value in the unit place of 'i' to 'k' the variable in 'num'



For example if i = 1234, the value of num [k] will be '4'.



Since to diaplay a value like '4' in the lcd we need to convert it to its ascii value first, the following statement does the same,



c=num[p]+48;

Remember ’48’ is the ascii value of ‘0’. (zero) 

[Ashutosh Bhatt]

to display anything on LCD first it must be converted into ASCII

e.g. to display A you have to send its  ASCII value 40h

to display a you have to send its ASCII value 63h

to display any number 0 to 9 send 30h to 39h

like wise

the given function first saparate all the digits of any number (eg 254 = 2, 5, 4)

then it converts all number into ASCII by adding 30h = 48 d

 

[Author]

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