Lets say we have HEX value,

(byte & 0xF0) // send upper nibble
((byte << 4) & 0xF0); // send lower nibble

How do I convert HEX to ASCII and display on LCD without sprintf itoa ?

 

Lets say we have HEX value,

(byte & 0xF0) // send upper nibble
((byte << 4) & 0xF0); // send lower nibble

How do I convert HEX to ASCII and display on LCD without sprintf itoa ?

If your byte contains, for example, 0x41 which is the ASCII code for 'A' what do you want to show on the LCD "A" or "41"?

 

If your byte contains, for example, 0x41 which is the ASCII code for 'A' what do you want to show on the LCD "A" or "41"?

I want to show " 41" on LCD display

 

I want to show " 41" on LCD display

For each nibble:
if nibble < 10 then output char or byte value of '0' + nibble
else output char or byte value of 'A' + nibble - 10

 

You have 2 numbers...

lsb = number & 0x0F;
msb = (number & 0xF0) >> 4;

If the l/msb is below 10, add '0'

lsbAsASCII = lsb + '0';

If l/msb is 10 or over...

lsbAsASCII = (lsb - 0x0A) + 'A';

 

You have 2 numbers...

I think the OP just has one number contained in a byte
So where you said "msb = (number & 0xF0) >> 8;" I think the 8 should be a 4
Edit - ignore this as the post I was talking about has been edited to correct it

 

What kind of LCD do you have? A 1602 (2x16 character display) or a pixelated graphic display (126x64 or other)?

 

I think the OP just has one number contained in a byte
So where you said "msb = (number & 0xF0) >> 8;" I think the 8 should be a 4

Fast fingers - I quickly edited it, but you managed to catch me!

 

Fast fingers - I quickly edited it, but you managed to catch me!

Sorry. I've edited my post now to say it should be ignored as you corrected your post.

 

lsb = (byte & 0x0F);
msb = (byte & 0xF0) >> 4;
lsb = (lsb < 10) ? lsb : lsb + 7;
msb = (msb < 10) ? msb : msb + 7;
lsb += '0';
msb += '0';

 

If your byte contains, for example, 0x41 which is the ASCII code for 'A' what do you want to show on the LCD "A" or "41"?

There is an alternative approach, rather than executing code for this create a lookup table, this will execute pretty quickly.

input of 0 -> '00'

input of 117 -> '75'

input pf 255 -> 'FF'

Of course if you cant spare 512 bytes then this won't be possible but if memory is not too constrained this is a neat option to consider. With some additional simple code you can just have a table of 16 bytes not 255, but that needs a bit of division.