Char to function transfer

Hi Everyone

I finally got my LCD working and now I can write anything to the LCD.

For next step, I am trying to put the value of ADC0 to LCD

I an able to get the ADC running and have verified it by putting the output to LED's on Port B. The LCD is connected on PORT D (data) and Port A (Control 1-3)

Now problem is that I am not able to tranfer ADC value to LCD. I think I am having some problem in Char to function tranfer. The code compiles fine, so I cannot debug it.


My MAIN code is

unsigned char val0;

while(1)
{
val0 = ReadAdcChannel(0);
lcd_goto(0); // select first line
lcd_puts(val0);
PORTB=val0;
}

Click to expand...

LCD Puts function is below

void
lcd_puts(const char * s)
{
LCD_RS = 1; // write characters
while(*s)
lcd_write(*s++);
}

Click to expand...

What am I doing wrong. Pl help. Thanks

hi

convert the char to ascii because lcd displays only ascii.in a char you will get 3 ascii numbers.
then display the same on lcd

ml

If you need to format an integer or float value to send to a display, you can use the sprintf function that is defined in stdio.h.
Example:

microlab said:

hi

convert the char to ascii because lcd displays only ascii.in a char you will get 3 ascii numbers.
then display the same on lcd

ml

Click to expand...

Thanks for your reply

if I do

lcd_puts("THIS IS TEXT");

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I get

THIS IS TEXT

Click to expand...

on the lcd. Hence with this code, I do not need to do ASCII conversion. Its a matter of conversion & transferring value to lcd_puts function

If you look at the character map of your display, you will find that 'T' is represented as the 8 bit number 0x54. This is the ascii code for 'T'.
The ascii code for the number 0 is 0x30 and for 1 it is 0x31. So if you take a digit and add 0x30 to it you get the ascii code for the digit.

a = 0x30 + 1;
lcd_puts(a); will display 1.

You need to convert your ADC reading value to ascii codes to display it on the lcd.
sprintf does this for you with formatting options.

btbass said:

If you look at the character map of your display, you will find that 'T' is represented as the 8 bit number 0x54. This is the ascii code for 'T'.
The ascii code for the number 0 is 0x30 and for 1 it is 0x31. So if you take a digit and add 0x30 to it you get the ascii code for the digit.

a = 0x30 + 1;
lcd_puts(a); will display 1.

You need to convert your ADC reading value to ascii codes to display it on the lcd.
sprintf does this for you with formatting options.

Click to expand...

Thanks. I found your reply very useful

So let me rewrite the code

unsigned char val0;
char buffer[16];

while(1)
{
val0 = ReadAdcChannel(0);
lcd_goto(0); // select first line
sprintf(buffer, "Value is %c", val0);
lcd_puts(buffer);
PORTB=val0;
}

Click to expand...

is this code ok? Basically I am unsure if sprintf will also work on unsigned char.

Once again thanks for your help

Don't forget to #include <stdio.h>

Look at printf for the formatting options, sprintf has the same.

btbass said:

Don't forget to #include <stdio.h>

Look at printf for the formatting options, sprintf has the same.

Click to expand...

Yes I compiled my code in MPLAB and it compiled fine. I need to test the code on micro-controller and then will know. Thanks

It depends on what compiler you are using.
But they should all support the basic options.

d, i Print an int as a signed decimal number.
u Print decimal unsigned int.
f, F Print a double in normal (fixed-point) notation.
x, X Print an unsigned int as a hexadecimal number. 'x' uses lower-case letters and 'X' uses upper-case.
o Print an unsigned int in octal.
s Print a character string.
c Print a char (character).

You are asking it to print a char? %c
Ask it to print a unsigned int. %u