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Adafruit-GFX-Library/Adafruit_SPITFT.h
Ladyada e3073d243f add ability to change SPI speed after init
2019-09-13 00:10:35 -04:00

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/*!
* @file Adafruit_SPITFT.h
*
* Part of Adafruit's GFX graphics library. Originally this class was
* written to handle a range of color TFT displays connected via SPI,
* but over time this library and some display-specific subclasses have
* mutated to include some color OLEDs as well as parallel-interfaced
* displays. The name's been kept for the sake of older code.
*
* Adafruit invests time and resources providing this open source code,
* please support Adafruit and open-source hardware by purchasing
* products from Adafruit!
*
* Written by Limor "ladyada" Fried for Adafruit Industries,
* with contributions from the open source community.
*
* BSD license, all text here must be included in any redistribution.
*/
#ifndef _ADAFRUIT_SPITFT_H_
#define _ADAFRUIT_SPITFT_H_
#if !defined(__AVR_ATtiny85__) // Not for ATtiny, at all
#include <SPI.h>
#include "Adafruit_GFX.h"
// HARDWARE CONFIG ---------------------------------------------------------
#if defined(__AVR__)
typedef uint8_t ADAGFX_PORT_t; ///< PORT values are 8-bit
#define USE_FAST_PINIO ///< Use direct PORT register access
#elif defined(ARDUINO_STM32_FEATHER) // WICED
typedef class HardwareSPI SPIClass; ///< SPI is a bit odd on WICED
typedef uint32_t ADAGFX_PORT_t; ///< PORT values are 32-bit
#elif defined(__arm__)
#if defined(ARDUINO_ARCH_SAMD)
// Adafruit M0, M4
typedef uint32_t ADAGFX_PORT_t; ///< PORT values are 32-bit
#define USE_FAST_PINIO ///< Use direct PORT register access
#define HAS_PORT_SET_CLR ///< PORTs have set & clear registers
#elif defined(CORE_TEENSY)
// PJRC Teensy 4.x
#if defined(__IMXRT1052__) || defined(__IMXRT1062__) // Teensy 4.x
typedef uint32_t ADAGFX_PORT_t; ///< PORT values are 32-bit
// PJRC Teensy 3.x
#else
typedef uint8_t ADAGFX_PORT_t; ///< PORT values are 8-bit
#endif
#define USE_FAST_PINIO ///< Use direct PORT register access
#define HAS_PORT_SET_CLR ///< PORTs have set & clear registers
#else
// Arduino Due?
typedef uint32_t ADAGFX_PORT_t; ///< PORT values are 32-bit
// 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; ///< PORT values are 32-bit
#endif // end !ARM
typedef volatile ADAGFX_PORT_t* PORTreg_t; ///< PORT register type
#if defined(__AVR__)
#define DEFAULT_SPI_FREQ 8000000L ///< Hardware SPI default speed
#else
#define DEFAULT_SPI_FREQ 16000000L ///< Hardware SPI default speed
#endif
#if defined(ADAFRUIT_PYPORTAL) || defined(ADAFRUIT_PYBADGE_M4_EXPRESS) || defined(ADAFRUIT_PYGAMER_M4_EXPRESS)|| defined(ADAFRUIT_MONSTER_M4SK_EXPRESS)
#define USE_SPI_DMA ///< Auto DMA if using PyPortal
#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(ARDUINO_ARCH_SAMD)
#undef USE_SPI_DMA ///< DMA currently for SAMD chips only
#endif
#if defined(USE_SPI_DMA)
#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 }; ///< For first arg to parallel constructor
// CLASS DEFINITION --------------------------------------------------------
/*!
@brief Adafruit_SPITFT is an intermediary class between Adafruit_GFX
and various hardware-specific subclasses for different displays.
It handles certain operations that are common to a range of
displays (address window, area fills, etc.). Originally these were
all color TFT displays interfaced via SPI, but it's since expanded
to include color OLEDs and parallel-interfaced TFTs. THE NAME HAS
BEEN KEPT TO AVOID BREAKING A LOT OF SUBCLASSES AND EXAMPLE CODE.
Many of the class member functions similarly live on with names
that don't necessarily accurately describe what they're doing,
again to avoid breaking a lot of other code. If in doubt, read
the comments.
*/
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);
// CLASS MEMBER FUNCTIONS ----------------------------------------------
// These first two functions MUST be declared by subclasses:
/*!
@brief Display-specific initialization function.
@param freq SPI frequency, in hz (or 0 for default or unused).
*/
virtual void begin(uint32_t freq) = 0;
/*!
@brief Set up the specific display hardware's "address window"
for subsequent pixel-pushing operations.
@param x Leftmost pixel of area to be drawn (MUST be within
display bounds at current rotation setting).
@param y Topmost pixel of area to be drawn (MUST be within
display bounds at current rotation setting).
@param w Width of area to be drawn, in pixels (MUST be >0 and,
added to x, within display bounds at current rotation).
@param h Height of area to be drawn, in pixels (MUST be >0 and,
added to x, within display bounds at current rotation).
*/
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 = NULL, uint8_t numDataBytes = 0);
void sendCommand(uint8_t commandByte, const uint8_t *dataBytes, uint8_t numDataBytes);
uint8_t readcommand8(uint8_t commandByte, uint8_t index = 0);
// 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);
// 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
// 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:
/*!
@brief Set the chip-select line HIGH. Does NOT check whether CS pin
is set (>=0), that should be handled in calling function.
Despite function name, this is used even if the display
connection is parallel.
*/
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
}
/*!
@brief Set the chip-select line LOW. Does NOT check whether CS pin
is set (>=0), that should be handled in calling function.
Despite function name, this is used even if the display
connection is parallel.
*/
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
}
/*!
@brief Set the data/command line HIGH (data mode).
*/
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
}
/*!
@brief Set the data/command line LOW (command mode).
*/
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; ///< PORT register for chip select SET
PORTreg_t csPortClr; ///< PORT register for chip select CLEAR
PORTreg_t dcPortSet; ///< PORT register for data/command SET
PORTreg_t dcPortClr; ///< PORT register for data/command CLEAR
#else // !HAS_PORT_SET_CLR
PORTreg_t csPort; ///< PORT register for chip select
PORTreg_t dcPort; ///< PORT register for data/command
#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; ///< SPI class pointer
#if defined(SPI_HAS_TRANSACTION)
SPISettings settings; ///< SPI transaction settings
#else
uint32_t _freq; ///< SPI bitrate (if no SPI transactions)
#endif
uint32_t _mode; ///< SPI data mode (transactions or no)
} hwspi; ///< Hardware SPI values
struct { // Values specific to SOFTWARE SPI:
#if defined(USE_FAST_PINIO)
PORTreg_t misoPort; ///< PORT (PIN) register for MISO
#if defined(HAS_PORT_SET_CLR)
PORTreg_t mosiPortSet; ///< PORT register for MOSI SET
PORTreg_t mosiPortClr; ///< PORT register for MOSI CLEAR
PORTreg_t sckPortSet; ///< PORT register for SCK SET
PORTreg_t sckPortClr; ///< PORT register for SCK CLEAR
#if !defined(KINETISK)
ADAGFX_PORT_t mosiPinMask; ///< Bitmask for MOSI
ADAGFX_PORT_t sckPinMask; ///< Bitmask for SCK
#endif // end !KINETISK
#else // !HAS_PORT_SET_CLR
PORTreg_t mosiPort; ///< PORT register for MOSI
PORTreg_t sckPort; ///< PORT register for SCK
ADAGFX_PORT_t mosiPinMaskSet; ///< Bitmask for MOSI SET (OR)
ADAGFX_PORT_t mosiPinMaskClr; ///< Bitmask for MOSI CLEAR (AND)
ADAGFX_PORT_t sckPinMaskSet; ///< Bitmask for SCK SET (OR bitmask)
ADAGFX_PORT_t sckPinMaskClr; ///< Bitmask for SCK CLEAR (AND)
#endif // end HAS_PORT_SET_CLR
#if !defined(KINETISK)
ADAGFX_PORT_t misoPinMask; ///< Bitmask for MISO
#endif // end !KINETISK
#endif // end USE_FAST_PINIO
int8_t _mosi; ///< MOSI pin #
int8_t _miso; ///< MISO pin #
int8_t _sck; ///< SCK pin #
} swspi; ///< Software SPI values
struct { // Values specific to 8-bit parallel:
#if defined(USE_FAST_PINIO)
#if defined(__IMXRT1052__) || defined(__IMXRT1062__) // Teensy 4.x
volatile uint32_t *writePort; ///< PORT register for DATA WRITE
volatile uint32_t *readPort; ///< PORT (PIN) register for DATA READ
#else
volatile uint8_t *writePort; ///< PORT register for DATA WRITE
volatile uint8_t *readPort; ///< PORT (PIN) register for DATA READ
#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; ///< PORT byte data direction SET
volatile uint32_t *dirClr; ///< PORT byte data direction CLEAR
#else
volatile uint8_t *dirSet; ///< PORT byte data direction SET
volatile uint8_t *dirClr; ///< PORT byte data direction CLEAR
#endif
PORTreg_t wrPortSet; ///< PORT register for write strobe SET
PORTreg_t wrPortClr; ///< PORT register for write strobe CLEAR
PORTreg_t rdPortSet; ///< PORT register for read strobe SET
PORTreg_t rdPortClr; ///< PORT register for read strobe CLEAR
#if !defined(KINETISK)
ADAGFX_PORT_t wrPinMask; ///< Bitmask for write strobe
#endif // end !KINETISK
ADAGFX_PORT_t rdPinMask; ///< Bitmask for read strobe
#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; ///< PORT direction register
PORTreg_t wrPort; ///< PORT register for write strobe
PORTreg_t rdPort; ///< PORT register for read strobe
ADAGFX_PORT_t wrPinMaskSet; ///< Bitmask for write strobe SET (OR)
ADAGFX_PORT_t wrPinMaskClr; ///< Bitmask for write strobe CLEAR (AND)
ADAGFX_PORT_t rdPinMaskSet; ///< Bitmask for read strobe SET (OR)
ADAGFX_PORT_t rdPinMaskClr; ///< Bitmask for read strobe CLEAR (AND)
#endif // end HAS_PORT_SET_CLR
#endif // end USE_FAST_PINIO
int8_t _d0; ///< Data pin 0 #
int8_t _wr; ///< Write strobe pin #
int8_t _rd; ///< Read strobe pin # (or -1)
bool wide = 0; ///< If true, is 16-bit interface
} tft8; ///< Parallel interface settings
#if defined(__cplusplus) && (__cplusplus >= 201100)
}; ///< Only one interface is active
#endif
#if defined(USE_SPI_DMA) // Used by hardware SPI and tft8
Adafruit_ZeroDMA dma; ///< DMA instance
DmacDescriptor *dptr = NULL; ///< 1st descriptor
DmacDescriptor *descriptor = NULL; ///< Allocated descriptor list
uint16_t *pixelBuf[2]; ///< Working buffers
uint16_t maxFillLen; ///< Max pixels per DMA xfer
uint16_t lastFillColor = 0; ///< Last color used w/fill
uint32_t lastFillLen = 0; ///< # of pixels w/last fill
uint8_t onePixelBuf; ///< For hi==lo fill
#endif
#if defined(USE_FAST_PINIO)
#if defined(HAS_PORT_SET_CLR)
#if !defined(KINETISK)
ADAGFX_PORT_t csPinMask; ///< Bitmask for chip select
ADAGFX_PORT_t dcPinMask; ///< Bitmask for data/command
#endif // end !KINETISK
#else // !HAS_PORT_SET_CLR
ADAGFX_PORT_t csPinMaskSet; ///< Bitmask for chip select SET (OR)
ADAGFX_PORT_t csPinMaskClr; ///< Bitmask for chip select CLEAR (AND)
ADAGFX_PORT_t dcPinMaskSet; ///< Bitmask for data/command SET (OR)
ADAGFX_PORT_t dcPinMaskClr; ///< Bitmask for data/command CLEAR (AND)
#endif // end HAS_PORT_SET_CLR
#endif // end USE_FAST_PINIO
uint8_t connection; ///< TFT_HARD_SPI, TFT_SOFT_SPI, etc.
int8_t _rst; ///< Reset pin # (or -1)
int8_t _cs; ///< Chip select pin # (or -1)
int8_t _dc; ///< Data/command pin #
int16_t _xstart = 0; ///< Internal framebuffer X offset
int16_t _ystart = 0; ///< Internal framebuffer Y offset
uint8_t invertOnCommand = 0; ///< Command to enable invert mode
uint8_t invertOffCommand = 0; ///< Command to disable invert mode
uint32_t _freq = 0; ///< Dummy var to keep subclasses happy
};
#endif // end __AVR_ATtiny85__
#endif // end _ADAFRUIT_SPITFT_H_
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