#if !defined(_RADIOLIB_HELLSCHREIBER_H)
 #define _RADIOLIB_HELLSCHREIBER_H
 
 #include "../../TypeDef.h"
 
 #if !defined(RADIOLIB_EXCLUDE_HELLSCHREIBER)
 
 #include "../PhysicalLayer/PhysicalLayer.h"
 #include "../AFSK/AFSK.h"
 
 #define RADIOLIB_HELL_FONT_WIDTH                                7
 #define RADIOLIB_HELL_FONT_HEIGHT                               7
 
 // font definition: characters are stored in rows,
 //                  least significant byte of each character is the first row
 //                  Hellschreiber use 7x7 characters, but this simplified font uses only 5x5 - the extra bytes aren't stored
 static const uint8_t HellFont[64][RADIOLIB_HELL_FONT_WIDTH - 2] RADIOLIB_NONVOLATILE = {
   { 0b0000000, 0b0000000, 0b0000000, 0b0000000, 0b0000000 },  // space
   { 0b0001000, 0b0001000, 0b0001000, 0b0000000, 0b0001000 },  // !
   { 0b0010100, 0b0010100, 0b0000000, 0b0000000, 0b0000000 },  // "
   { 0b0010100, 0b0111110, 0b0010100, 0b0111110, 0b0010100 },  // #
   { 0b0111110, 0b0101000, 0b0111110, 0b0001010, 0b0111110 },  // $
   { 0b0110010, 0b0110100, 0b0001000, 0b0010110, 0b0100110 },  // %
   { 0b0010000, 0b0101000, 0b0010000, 0b0101000, 0b0110100 },  // &
   { 0b0001000, 0b0001000, 0b0000000, 0b0000000, 0b0000000 },  // '
   { 0b0000100, 0b0001000, 0b0001000, 0b0001000, 0b0000100 },  // (
   { 0b0010000, 0b0001000, 0b0001000, 0b0001000, 0b0010000 },  // )
   { 0b0010100, 0b0001000, 0b0010100, 0b0000000, 0b0000000 },  // *
   { 0b0001000, 0b0001000, 0b0111110, 0b0001000, 0b0001000 },  // +
   { 0b0000000, 0b0000000, 0b0000000, 0b0001000, 0b0010000 },  // ,
   { 0b0000000, 0b0000000, 0b0111110, 0b0000000, 0b0000000 },  // -
   { 0b0000000, 0b0000000, 0b0000000, 0b0000000, 0b0001000 },  // .
   { 0b0000010, 0b0000100, 0b0001000, 0b0010000, 0b0100000 },  // /
   { 0b0011100, 0b0100110, 0b0101010, 0b0110010, 0b0011100 },  // 0
   { 0b0011000, 0b0001000, 0b0001000, 0b0001000, 0b0001000 },  // 1
   { 0b0011000, 0b0100100, 0b0001000, 0b0010000, 0b0111100 },  // 2
   { 0b0111100, 0b0000100, 0b0011100, 0b0000100, 0b0111100 },  // 3
   { 0b0100100, 0b0100100, 0b0111100, 0b0000100, 0b0000100 },  // 4
   { 0b0011100, 0b0100000, 0b0111100, 0b0000100, 0b0111100 },  // 5
   { 0b0111100, 0b0100000, 0b0111100, 0b0100100, 0b0111100 },  // 6
   { 0b0111100, 0b0000100, 0b0001000, 0b0010000, 0b0100000 },  // 7
   { 0b0111100, 0b0100100, 0b0011000, 0b0100100, 0b0111100 },  // 8
   { 0b0111100, 0b0100100, 0b0111100, 0b0000100, 0b0111100 },  // 9
   { 0b0000000, 0b0001000, 0b0000000, 0b0000000, 0b0001000 },  // :
   { 0b0000000, 0b0001000, 0b0000000, 0b0001000, 0b0001000 },  // ;
   { 0b0000100, 0b0001000, 0b0010000, 0b0001000, 0b0000100 },  // <
   { 0b0000000, 0b0111110, 0b0000000, 0b0111110, 0b0000000 },  // =
   { 0b0010000, 0b0001000, 0b0000100, 0b0001000, 0b0010000 },  // >
   { 0b0011100, 0b0000100, 0b0001000, 0b0000000, 0b0001000 },  // ?
   { 0b0011100, 0b0100010, 0b0101110, 0b0101010, 0b0001100 },  // @
   { 0b0111110, 0b0100010, 0b0111110, 0b0100010, 0b0100010 },  // A
   { 0b0111100, 0b0010010, 0b0011110, 0b0010010, 0b0111100 },  // B
   { 0b0011110, 0b0110000, 0b0100000, 0b0110000, 0b0011110 },  // C
   { 0b0111100, 0b0100010, 0b0100010, 0b0100010, 0b0111100 },  // D
   { 0b0111110, 0b0100000, 0b0111100, 0b0100000, 0b0111110 },  // E
   { 0b0111110, 0b0100000, 0b0111100, 0b0100000, 0b0100000 },  // F
   { 0b0111110, 0b0100000, 0b0101110, 0b0100010, 0b0111110 },  // G
   { 0b0100010, 0b0100010, 0b0111110, 0b0100010, 0b0100010 },  // H
   { 0b0011100, 0b0001000, 0b0001000, 0b0001000, 0b0011100 },  // I
   { 0b0111100, 0b0001000, 0b0001000, 0b0101000, 0b0111000 },  // J
   { 0b0100100, 0b0101000, 0b0110000, 0b0101000, 0b0100100 },  // K
   { 0b0100000, 0b0100000, 0b0100000, 0b0100000, 0b0111100 },  // L
   { 0b0100010, 0b0110110, 0b0101010, 0b0100010, 0b0100010 },  // M
   { 0b0100010, 0b0110010, 0b0101010, 0b0100110, 0b0100010 },  // N
   { 0b0011100, 0b0100010, 0b0100010, 0b0100010, 0b0011100 },  // O
   { 0b0111110, 0b0100010, 0b0111110, 0b0100000, 0b0100000 },  // P
   { 0b0111110, 0b0100010, 0b0100010, 0b0100110, 0b0111110 },  // Q
   { 0b0111110, 0b0100010, 0b0111110, 0b0100100, 0b0100010 },  // R
   { 0b0111110, 0b0100000, 0b0111110, 0b0000010, 0b0111110 },  // S
   { 0b0111110, 0b0001000, 0b0001000, 0b0001000, 0b0001000 },  // T
   { 0b0100010, 0b0100010, 0b0100010, 0b0100010, 0b0111110 },  // U
   { 0b0100010, 0b0100010, 0b0010100, 0b0010100, 0b0001000 },  // V
   { 0b0100010, 0b0100010, 0b0101010, 0b0110110, 0b0100010 },  // W
   { 0b0100010, 0b0010100, 0b0001000, 0b0010100, 0b0100010 },  // X
   { 0b0100010, 0b0010100, 0b0001000, 0b0001000, 0b0001000 },  // Y
   { 0b0111110, 0b0000100, 0b0001000, 0b0010000, 0b0111110 },  // Z
   { 0b0001100, 0b0001000, 0b0001000, 0b0001000, 0b0001100 },  // [
   { 0b0100000, 0b0010000, 0b0001000, 0b0000100, 0b0000010 },  // backslash
   { 0b0011000, 0b0001000, 0b0001000, 0b0001000, 0b0011000 },  // ]
   { 0b0001000, 0b0010100, 0b0000000, 0b0000000, 0b0000000 },  // ^
   { 0b0000000, 0b0000000, 0b0000000, 0b0000000, 0b0111110 }   // _
 };
 
 /*!
   \class HellClient
 
   \brief Client for Hellschreiber transmissions.
 */
 class HellClient {
   public:
     /*!
       \brief Constructor for 2-FSK mode.
 
       \param phy Pointer to the wireless module providing PhysicalLayer communication.
     */
     explicit HellClient(PhysicalLayer* phy);
 
     #if !defined(RADIOLIB_EXCLUDE_AFSK)
     /*!
       \brief Constructor for AFSK mode.
 
       \param audio Pointer to the AFSK instance providing audio.
     */
     explicit HellClient(AFSKClient* audio);
     #endif
 
     // basic methods
 
     /*!
       \brief Initialization method.
 
       \param base Base RF frequency to be used in MHz (in 2-FSK mode), or the tone frequency in Hz (in AFSK mode).
 
       \param rate Baud rate to be used during transmission. Defaults to 122.5 ("Feld Hell")
     */
     int16_t begin(float base, float rate = 122.5);
 
     /*!
       \brief Method to "print" a buffer of pixels, this is exposed to allow users to send custom characters.
 
       \param buff Buffer of pixels to send, in a 7x7 pixel array.
 
       \returns Always returns the number of printed glyphs (1).
     */
     size_t printGlyph(uint8_t* buff);
 
     /*!
       \brief Invert text color.
 
       \param invert Whether to enable color inversion (white text on black background), or not (black text on white background)
     */
     void setInversion(bool invert);
 
     size_t write(const char* str);
     size_t write(uint8_t* buff, size_t len);
     size_t write(uint8_t b);
 
     size_t print(__FlashStringHelper*);
     size_t print(const String &);
     size_t print(const char[]);
     size_t print(char);
     size_t print(unsigned char, int = DEC);
     size_t print(int, int = DEC);
     size_t print(unsigned int, int = DEC);
     size_t print(long, int = DEC);
     size_t print(unsigned long, int = DEC);
     size_t print(double, int = 2);
 
     size_t println(void);
     size_t println(__FlashStringHelper*);
     size_t println(const String &);
     size_t println(const char[]);
     size_t println(char);
     size_t println(unsigned char, int = DEC);
     size_t println(int, int = DEC);
     size_t println(unsigned int, int = DEC);
     size_t println(long, int = DEC);
     size_t println(unsigned long, int = DEC);
     size_t println(double, int = 2);
 
 #if !defined(RADIOLIB_GODMODE)
   private:
 #endif
     PhysicalLayer* _phy;
     #if !defined(RADIOLIB_EXCLUDE_AFSK)
     AFSKClient* _audio;
     #endif
 
     uint32_t _base = 0, _baseHz = 0;
     uint32_t _pixelDuration = 0;
     bool _inv = false;
 
     size_t printNumber(unsigned long, uint8_t);
     size_t printFloat(double, uint8_t);
 
     int16_t transmitDirect(uint32_t freq = 0, uint32_t freqHz = 0);
     int16_t standby();
 };
 
 #endif
 
 #endif

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