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I have a string which I send to the arduino using serial monitor. Something like that:

my specific string 0x0F 0x2C 0x98 0xBC

How can I parse this string in the arduino to get an array of hex values:

0x0F 0x2C 0x98 0xBD

? There are two prerequisites:

  1. All hexadecimal starts with #
  2. The size of hexadecimal is 2. No 0x111 or '0xbbb'
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1 Answer 1

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You can try reading each character and convert it to hexadecimal representation. I suppose you wanna 1 byte each value in hexadecimal representation, so, let's start.

For example the string "0x25", ignore the 0x and read the '2' and save it into a char variable. Same for '5';

char highBits = '2' - '0'; // convert to decimal representation
char lowBits  = '5' - '0'; 

byte = (highBits << 4 | lowBits);

Now, save it inside you array. Make sure you check if the value is one of the possible letters in hexadecimal and convert it properly (A=10 and so on). Just include an if statement if it is a letter and convert it.

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