Convert String (5-byte HEX) received via Serial to uint64 for nRF24L01+ address?

Projects Programming
4

The RF24 library requires a uint64 value

The RF24 library is silly and inefficient, probably. Unless it is actually doing 64bit math, something like char[5] would be a lot better on AVR-like processors (avr-gcc is known to produce particularly bad code for 64bit manipulation)

However, something like the following should work ok:

char hexCharToBin(char c) {
  if (isdigit(c)) {  // 0 - 9
    return c - '0';
  } else if (isxdigit(c)) { // A-F, a-f
    return (c & 0xF) + 9;
  }
  return -1;
}

unsigned long long hexStrToULL(char * string)
{
   unsigned long long x =0;
   char c;
   do {
     c =hexCharToBin(*string++);
     if (c < 0)
       break;
     x = (x << 4) | c;
  } while (1);
  return x;
}