HexPrint

gistfile1.txt

/*
A tiny little hacked-together class to overload Serial.write to output hex to serial monitor, useful for debugging binary data e.g. protobufs

Usage, e.g. for debugging a nanopb stream wrapped by PacketIO:

packetio::COBSPrint cobs_out(hex_print);
pb_ostream_s pb_out = as_pb_ostream(cobs_out);

or for raw nanopb:

pb_ostream_s pb_out = as_pb_ostream(hex_print);
*/

class HexPrint : public Print
{
public:
    void printHex(int num, int precision)
    {
      char tmp[16];
      char format[128];
      sprintf(format, "%%.%dX", precision);
      sprintf(tmp, format, num);
      Serial.print(tmp);
    }

    virtual size_t write(const uint8_t *buffer, size_t size) {
        size_t n = 0;
        while (size--) {
          printHex(*buffer++, 2);
          n++;
        }
        return n;
    }

    virtual size_t write(const uint8_t val) {
        printHex(val, 2);
        return 1;
    };

} hex_print;