How to `Serial.print()` “full” hexadecimal bytes?

Question

I am programming Arduino and I am trying to Serial.print() bytes in hexadecimal format \"the my way\" (keep reading for more information).

That is, by u

Answer 1

Try this:

//Converts the upper nibble of a binary value to a hexadecimal ASCII byte.
//For example, btohexa_high(0xAE) will return 'A'.
unsigned char btohexa_high(unsigned char b)
{
    b >>= 4;
    return (b>0x9u) ? b+'A'-10:b+'0';
}


//Converts the lower nibble of a binary value to a hexadecimal ASCII byte.
//  For example, btohexa_low(0xAE) will return 'E'.


unsigned char btohexa_low(unsigned char b)
{
    b &= 0x0F;
    return (b>9u) ? b+'A'-10:b+'0';
}

And in main code:

comand_mod=0xA1; //example variable
Serial.print(btohexa_high(comand_mod));
Serial.print(btohexa_low(comand_mod));