Adafruit_SPITFT.h

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#ifndef _ADAFRUIT_SPITFT_H_
#define _ADAFRUIT_SPITFT_H_

#if !defined(__AVR_ATtiny85__) // Not for ATtiny, at all

#include "Adafruit_GFX.h"
#include <SPI.h>

// HARDWARE CONFIG ---------------------------------------------------------

#if defined(__AVR__)
typedef uint8_t ADAGFX_PORT_t;       
#define USE_FAST_PINIO               
#elif defined(ARDUINO_STM32_FEATHER) // WICED
typedef class HardwareSPI SPIClass;        
typedef uint32_t ADAGFX_PORT_t;            
#elif defined(__arm__)
#if defined(ARDUINO_ARCH_SAMD)
// Adafruit M0, M4
typedef uint32_t ADAGFX_PORT_t; 
#define USE_FAST_PINIO   
#define HAS_PORT_SET_CLR 
#elif defined(CORE_TEENSY)
// PJRC Teensy 4.x
#if defined(__IMXRT1052__) || defined(__IMXRT1062__) // Teensy 4.x
typedef uint32_t ADAGFX_PORT_t; 
                                // PJRC Teensy 3.x
#else
typedef uint8_t ADAGFX_PORT_t; 
#endif
#define USE_FAST_PINIO   
#define HAS_PORT_SET_CLR 
#else
// Arduino Due?
typedef uint32_t ADAGFX_PORT_t; 
// USE_FAST_PINIO not available here (yet)...Due has a totally different
// GPIO register set and will require some changes elsewhere (e.g. in
// constructors especially).
#endif
#else                                      // !ARM
// Probably ESP8266 or ESP32. USE_FAST_PINIO is not available here (yet)
// but don't worry about it too much...the digitalWrite() implementation
// on these platforms is reasonably efficient and already RAM-resident,
// only gotcha then is no parallel connection support for now.
typedef uint32_t ADAGFX_PORT_t; 
#endif                                     // end !ARM
typedef volatile ADAGFX_PORT_t *PORTreg_t; 

#if defined(__AVR__)
#define DEFAULT_SPI_FREQ 8000000L 
#else
#define DEFAULT_SPI_FREQ 16000000L 
#endif

#if defined(ADAFRUIT_PYPORTAL) || defined(ADAFRUIT_PYPORTAL_M4_TITANO) ||      \
    defined(ADAFRUIT_PYBADGE_M4_EXPRESS) ||                                    \
    defined(ADAFRUIT_PYGAMER_M4_EXPRESS) ||                                    \
    defined(ADAFRUIT_MONSTER_M4SK_EXPRESS) || defined(NRF52_SERIES) ||         \
    defined(ADAFRUIT_CIRCUITPLAYGROUND_M0)
#define USE_SPI_DMA 
#else
                                           //#define USE_SPI_DMA ///< If set,
                                           // use DMA if available
#endif
// Another "oops" name -- this now also handles parallel DMA.
// If DMA is enabled, Arduino sketch MUST #include <Adafruit_ZeroDMA.h>
// Estimated RAM usage:
// 4 bytes/pixel on display major axis + 8 bytes/pixel on minor axis,
// e.g. 320x240 pixels = 320 * 4 + 240 * 8 = 3,200 bytes.

#if defined(USE_SPI_DMA) && (defined(__SAMD51__) || defined(ARDUINO_SAMD_ZERO))
#include <Adafruit_ZeroDMA.h>
#endif

// This is kind of a kludge. Needed a way to disambiguate the software SPI
// and parallel constructors via their argument lists. Originally tried a
// bool as the first argument to the parallel constructor (specifying 8-bit
// vs 16-bit interface) but the compiler regards this as equivalent to an
// integer and thus still ambiguous. SO...the parallel constructor requires
// an enumerated type as the first argument: tft8 (for 8-bit parallel) or
// tft16 (for 16-bit)...even though 16-bit isn't fully implemented or tested
// and might never be, still needed that disambiguation from soft SPI.
enum tftBusWidth { tft8bitbus, tft16bitbus };

// CLASS DEFINITION --------------------------------------------------------

class Adafruit_SPITFT : public Adafruit_GFX {

public:
  // CONSTRUCTORS --------------------------------------------------------

  // Software SPI constructor: expects width & height (at default rotation
  // setting 0), 4 signal pins (cs, dc, mosi, sclk), 2 optional pins
  // (reset, miso). cs argument is required but can be -1 if unused --
  // rather than moving it to the optional arguments, it was done this way
  // to avoid breaking existing code (-1 option was a later addition).
  Adafruit_SPITFT(uint16_t w, uint16_t h, int8_t cs, int8_t dc, int8_t mosi,
                  int8_t sck, int8_t rst = -1, int8_t miso = -1);

  // Hardware SPI constructor using the default SPI port: expects width &
  // height (at default rotation setting 0), 2 signal pins (cs, dc),
  // optional reset pin. cs is required but can be -1 if unused -- rather
  // than moving it to the optional arguments, it was done this way to
  // avoid breaking existing code (-1 option was a later addition).
  Adafruit_SPITFT(uint16_t w, uint16_t h, int8_t cs, int8_t dc,
                  int8_t rst = -1);

#if !defined(ESP8266) // See notes in .cpp
  // Hardware SPI constructor using an arbitrary SPI peripheral: expects
  // width & height (rotation 0), SPIClass pointer, 2 signal pins (cs, dc)
  // and optional reset pin. cs is required but can be -1 if unused.
  Adafruit_SPITFT(uint16_t w, uint16_t h, SPIClass *spiClass, int8_t cs,
                  int8_t dc, int8_t rst = -1);
#endif // end !ESP8266

  // Parallel constructor: expects width & height (rotation 0), flag
  // indicating whether 16-bit (true) or 8-bit (false) interface, 3 signal
  // pins (d0, wr, dc), 3 optional pins (cs, rst, rd). 16-bit parallel
  // isn't even fully implemented but the 'wide' flag was added as a
  // required argument to avoid ambiguity with other constructors.
  Adafruit_SPITFT(uint16_t w, uint16_t h, tftBusWidth busWidth, int8_t d0,
                  int8_t wr, int8_t dc, int8_t cs = -1, int8_t rst = -1,
                  int8_t rd = -1);

  // DESTRUCTOR ----------------------------------------------------------

  ~Adafruit_SPITFT(){};

  // CLASS MEMBER FUNCTIONS ----------------------------------------------

  // These first two functions MUST be declared by subclasses:

  virtual void begin(uint32_t freq) = 0;

  virtual void setAddrWindow(uint16_t x, uint16_t y, uint16_t w,
                             uint16_t h) = 0;

  // Remaining functions do not need to be declared in subclasses
  // unless they wish to provide hardware-specific optimizations.
  // Brief comments here...documented more thoroughly in .cpp file.

  // Subclass' begin() function invokes this to initialize hardware.
  // freq=0 to use default SPI speed. spiMode must be one of the SPI_MODEn
  // values defined in SPI.h, which are NOT the same as 0 for SPI_MODE0,
  // 1 for SPI_MODE1, etc...use ONLY the SPI_MODEn defines! Only!
  // Name is outdated (interface may be parallel) but for compatibility:
  void initSPI(uint32_t freq = 0, uint8_t spiMode = SPI_MODE0);
  void setSPISpeed(uint32_t freq);
  // Chip select and/or hardware SPI transaction start as needed:
  void startWrite(void);
  // Chip deselect and/or hardware SPI transaction end as needed:
  void endWrite(void);
  void sendCommand(uint8_t commandByte, uint8_t *dataBytes,
                   uint8_t numDataBytes);
  void sendCommand(uint8_t commandByte, const uint8_t *dataBytes = NULL,
                   uint8_t numDataBytes = 0);
  void sendCommand16(uint16_t commandWord, const uint8_t *dataBytes = NULL,
                     uint8_t numDataBytes = 0);
  uint8_t readcommand8(uint8_t commandByte, uint8_t index = 0);
  uint16_t readcommand16(uint16_t addr);

  // These functions require a chip-select and/or SPI transaction
  // around them. Higher-level graphics primitives might start a
  // single transaction and then make multiple calls to these functions
  // (e.g. circle or text rendering might make repeated lines or rects)
  // before ending the transaction. It's more efficient than starting a
  // transaction every time.
  void writePixel(int16_t x, int16_t y, uint16_t color);
  void writePixels(uint16_t *colors, uint32_t len, bool block = true,
                   bool bigEndian = false);
  void writeColor(uint16_t color, uint32_t len);
  void writeFillRect(int16_t x, int16_t y, int16_t w, int16_t h,
                     uint16_t color);
  void writeFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);
  void writeFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
  // This is a new function, similar to writeFillRect() except that
  // all arguments MUST be onscreen, sorted and clipped. If higher-level
  // primitives can handle their own sorting/clipping, it avoids repeating
  // such operations in the low-level code, making it potentially faster.
  // CALLING THIS WITH UNCLIPPED OR NEGATIVE VALUES COULD BE DISASTROUS.
  inline void writeFillRectPreclipped(int16_t x, int16_t y, int16_t w,
                                      int16_t h, uint16_t color);
  // Another new function, companion to the new non-blocking
  // writePixels() variant.
  void dmaWait(void);
  // Used by writePixels() in some situations, but might have rare need in
  // user code, so it's public...
  bool dmaBusy(void) const; // true if DMA is used and busy, false otherwise
  void swapBytes(uint16_t *src, uint32_t len, uint16_t *dest = NULL);

  // These functions are similar to the 'write' functions above, but with
  // a chip-select and/or SPI transaction built-in. They're typically used
  // solo -- that is, as graphics primitives in themselves, not invoked by
  // higher-level primitives (which should use the functions above).
  void drawPixel(int16_t x, int16_t y, uint16_t color);
  void fillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color);
  void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);
  void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
  // A single-pixel push encapsulated in a transaction. I don't think
  // this is used anymore (BMP demos might've used it?) but is provided
  // for backward compatibility, consider it deprecated:
  void pushColor(uint16_t color);

  using Adafruit_GFX::drawRGBBitmap; // Check base class first
  void drawRGBBitmap(int16_t x, int16_t y, uint16_t *pcolors, int16_t w,
                     int16_t h);

  void invertDisplay(bool i);
  uint16_t color565(uint8_t r, uint8_t g, uint8_t b);

  // Despite parallel additions, function names kept for compatibility:
  void spiWrite(uint8_t b);          // Write single byte as DATA
  void writeCommand(uint8_t cmd);    // Write single byte as COMMAND
  uint8_t spiRead(void);             // Read single byte of data
  void write16(uint16_t w);          // Write 16-bit value as DATA
  void writeCommand16(uint16_t cmd); // Write 16-bit value as COMMAND
  uint16_t read16(void);             // Read single 16-bit value

  // Most of these low-level functions were formerly macros in
  // Adafruit_SPITFT_Macros.h. Some have been made into inline functions
  // to avoid macro mishaps. Despite the addition of code for a parallel
  // display interface, the names have been kept for backward
  // compatibility (some subclasses may be invoking these):
  void SPI_WRITE16(uint16_t w); // Not inline
  void SPI_WRITE32(uint32_t l); // Not inline
  // Old code had both a spiWrite16() function and SPI_WRITE16 macro
  // in addition to the SPI_WRITE32 macro. The latter two have been
  // made into functions here, and spiWrite16() removed (use SPI_WRITE16()
  // instead). It looks like most subclasses had gotten comfortable with
  // SPI_WRITE16 and SPI_WRITE32 anyway so those names were kept rather
  // than the less-obnoxious camelcase variants, oh well.

  // Placing these functions entirely in the class definition inlines
  // them implicitly them while allowing their use in other code:

  void SPI_CS_HIGH(void) {
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if defined(KINETISK)
    *csPortSet = 1;
#else  // !KINETISK
    *csPortSet = csPinMask;
#endif // end !KINETISK
#else  // !HAS_PORT_SET_CLR
    *csPort |= csPinMaskSet;
#endif // end !HAS_PORT_SET_CLR
#else  // !USE_FAST_PINIO
    digitalWrite(_cs, HIGH);
#endif // end !USE_FAST_PINIO
  }

  void SPI_CS_LOW(void) {
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if defined(KINETISK)
    *csPortClr = 1;
#else  // !KINETISK
    *csPortClr = csPinMask;
#endif // end !KINETISK
#else  // !HAS_PORT_SET_CLR
    *csPort &= csPinMaskClr;
#endif // end !HAS_PORT_SET_CLR
#else  // !USE_FAST_PINIO
    digitalWrite(_cs, LOW);
#endif // end !USE_FAST_PINIO
  }

  void SPI_DC_HIGH(void) {
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if defined(KINETISK)
    *dcPortSet = 1;
#else  // !KINETISK
    *dcPortSet = dcPinMask;
#endif // end !KINETISK
#else  // !HAS_PORT_SET_CLR
    *dcPort |= dcPinMaskSet;
#endif // end !HAS_PORT_SET_CLR
#else  // !USE_FAST_PINIO
    digitalWrite(_dc, HIGH);
#endif // end !USE_FAST_PINIO
  }

  void SPI_DC_LOW(void) {
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if defined(KINETISK)
    *dcPortClr = 1;
#else  // !KINETISK
    *dcPortClr = dcPinMask;
#endif // end !KINETISK
#else  // !HAS_PORT_SET_CLR
    *dcPort &= dcPinMaskClr;
#endif // end !HAS_PORT_SET_CLR
#else  // !USE_FAST_PINIO
    digitalWrite(_dc, LOW);
#endif // end !USE_FAST_PINIO
  }

protected:
  // A few more low-level member functions -- some may have previously
  // been macros. Shouldn't have a need to access these externally, so
  // they've been moved to the protected section. Additionally, they're
  // declared inline here and the code is in the .cpp file, since outside
  // code doesn't need to see these.
  inline void SPI_MOSI_HIGH(void);
  inline void SPI_MOSI_LOW(void);
  inline void SPI_SCK_HIGH(void);
  inline void SPI_SCK_LOW(void);
  inline bool SPI_MISO_READ(void);
  inline void SPI_BEGIN_TRANSACTION(void);
  inline void SPI_END_TRANSACTION(void);
  inline void TFT_WR_STROBE(void); // Parallel interface write strobe
  inline void TFT_RD_HIGH(void);   // Parallel interface read high
  inline void TFT_RD_LOW(void);    // Parallel interface read low

  // CLASS INSTANCE VARIABLES --------------------------------------------

  // Here be dragons! There's a big union of three structures here --
  // one each for hardware SPI, software (bitbang) SPI, and parallel
  // interfaces. This is to save some memory, since a display's connection
  // will be only one of these. The order of some things is a little weird
  // in an attempt to get values to align and pack better in RAM.

#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
  PORTreg_t csPortSet; 
  PORTreg_t csPortClr; 
  PORTreg_t dcPortSet; 
  PORTreg_t dcPortClr; 
#else                  // !HAS_PORT_SET_CLR
  PORTreg_t csPort;                 
  PORTreg_t dcPort;                 
#endif                 // end HAS_PORT_SET_CLR
#endif                 // end USE_FAST_PINIO
#if defined(__cplusplus) && (__cplusplus >= 201100)
  union {
#endif
    struct {          //   Values specific to HARDWARE SPI:
      SPIClass *_spi; 
#if defined(SPI_HAS_TRANSACTION)
      SPISettings settings; 
#else
    uint32_t _freq; 
#endif
      uint32_t _mode; 
    } hwspi;          
    struct {          //   Values specific to SOFTWARE SPI:
#if defined(USE_FAST_PINIO)
      PORTreg_t misoPort; 
#if defined(HAS_PORT_SET_CLR)
      PORTreg_t mosiPortSet; 
      PORTreg_t mosiPortClr; 
      PORTreg_t sckPortSet;  
      PORTreg_t sckPortClr;  
#if !defined(KINETISK)
      ADAGFX_PORT_t mosiPinMask; 
      ADAGFX_PORT_t sckPinMask;  
#endif                           // end !KINETISK
#else                            // !HAS_PORT_SET_CLR
      PORTreg_t mosiPort;           
      PORTreg_t sckPort;            
      ADAGFX_PORT_t mosiPinMaskSet; 
      ADAGFX_PORT_t mosiPinMaskClr; 
      ADAGFX_PORT_t sckPinMaskSet;  
      ADAGFX_PORT_t sckPinMaskClr;  
#endif                           // end HAS_PORT_SET_CLR
#if !defined(KINETISK)
      ADAGFX_PORT_t misoPinMask; 
#endif                           // end !KINETISK
#endif                           // end USE_FAST_PINIO
      int8_t _mosi;              
      int8_t _miso;              
      int8_t _sck;               
    } swspi;                     
    struct {                     //   Values specific to 8-bit parallel:
#if defined(USE_FAST_PINIO)

#if defined(__IMXRT1052__) || defined(__IMXRT1062__) // Teensy 4.x
      volatile uint32_t *writePort; 
      volatile uint32_t *readPort;  
#else
      volatile uint8_t *writePort;  
      volatile uint8_t *readPort;   
#endif
#if defined(HAS_PORT_SET_CLR)
      // Port direction register pointers are always 8-bit regardless of
      // PORTreg_t -- even if 32-bit port, we modify a byte-aligned 8 bits.
#if defined(__IMXRT1052__) || defined(__IMXRT1062__) // Teensy 4.x
      volatile uint32_t *dirSet; 
      volatile uint32_t *dirClr; 
#else
      volatile uint8_t *dirSet; 
      volatile uint8_t *dirClr; 
#endif
      PORTreg_t wrPortSet; 
      PORTreg_t wrPortClr; 
      PORTreg_t rdPortSet; 
      PORTreg_t rdPortClr; 
#if !defined(KINETISK)
      ADAGFX_PORT_t wrPinMask; 
#endif                         // end !KINETISK
      ADAGFX_PORT_t rdPinMask; 
#else                          // !HAS_PORT_SET_CLR
      // Port direction register pointer is always 8-bit regardless of
      // PORTreg_t -- even if 32-bit port, we modify a byte-aligned 8 bits.
      volatile uint8_t *portDir;  
      PORTreg_t wrPort;           
      PORTreg_t rdPort;           
      ADAGFX_PORT_t wrPinMaskSet; 
      ADAGFX_PORT_t wrPinMaskClr; 
      ADAGFX_PORT_t rdPinMaskSet; 
      ADAGFX_PORT_t rdPinMaskClr; 
#endif                         // end HAS_PORT_SET_CLR
#endif                         // end USE_FAST_PINIO
      int8_t _d0;              
      int8_t _wr;              
      int8_t _rd;              
      bool wide = 0;           
    } tft8;                    
#if defined(__cplusplus) && (__cplusplus >= 201100)
  }; 
#endif
#if defined(USE_SPI_DMA) &&                                                    \
    (defined(__SAMD51__) ||                                                    \
     defined(ARDUINO_SAMD_ZERO))     // Used by hardware SPI and tft8
  Adafruit_ZeroDMA dma;              
  DmacDescriptor *dptr = NULL;       
  DmacDescriptor *descriptor = NULL; 
  uint16_t *pixelBuf[2];             
  uint16_t maxFillLen;               
  uint16_t lastFillColor = 0;        
  uint32_t lastFillLen = 0;          
  uint8_t onePixelBuf;               
#endif
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if !defined(KINETISK)
  ADAGFX_PORT_t csPinMask; 
  ADAGFX_PORT_t dcPinMask; 
#endif                     // end !KINETISK
#else                      // !HAS_PORT_SET_CLR
  ADAGFX_PORT_t csPinMaskSet;     
  ADAGFX_PORT_t csPinMaskClr;     
  ADAGFX_PORT_t dcPinMaskSet;     
  ADAGFX_PORT_t dcPinMaskClr;     
#endif                     // end HAS_PORT_SET_CLR
#endif                     // end USE_FAST_PINIO
  uint8_t connection;      
  int8_t _rst;             
  int8_t _cs;              
  int8_t _dc;              

  int16_t _xstart = 0;          
  int16_t _ystart = 0;          
  uint8_t invertOnCommand = 0;  
  uint8_t invertOffCommand = 0; 

  uint32_t _freq = 0; 
};

#endif // end __AVR_ATtiny85__
#endif // end _ADAFRUIT_SPITFT_H_