char to byte

[coding101]

Any code to take 2 ascii chars and put into 1 byte?

0x16 = ? byte

[Hiroshe]

Are you having a problem with understanding the math?

In decimal, another way to write 123 is:
123 = 1*10^2 + 2*10^1 + 3*10^0

Same argument can be made for hex:
0x17 = 1*16^1 + 7*16^0 = 23

Programming this should be easy. Try it.

[coding101]

no thats not it..
i mean

Hex 2a
char a = getc() // '2'
char b = getc() // 'a'

0x2a = 42
I want to assign

byte = 42

[Hiroshe]

What part are you having problems with?

You've read 2 characters representing the digits of a hex number.

Now you need to convert them from characters to integers.

And then you use the formula: byte = d_n*b^n + ... + d_0*b^0 where byte is a uint8_t.