Hex to C String

In case, you do not have sprintf or atoi and etc. Not efficient but works.

char hexDigit(unsigned char n)
{
    if (n < 10) {
        return n + '0';
    } else {
        return (n - 10) + 'A';
    }
}

void hexify_ascii(char c, char * buf)
{
 char high = (c >> 4) & 0xF;
 char low = c & 0xF;

 *buf       = hexDigit(high);
 *(buf + 1) = hexDigit(low);
}


void printHex(char* input, int len)
{
  char buf[200];
  char* p = buf;
  int i;
  for (i = 0; i < len; ++i)
  {
    hexify_ascii(input[i], p);
    p+=2;
  }

  *p = 0;

  uart_print(buf);
  // printf("%s\n", buf);

}