added generic SPI TFT wrapper

Author: ladyada

Adafruit_SPITFT.cpp

@@ -0,0 +1,336 @@
+/***************************************************
+  This is our library for generic SPI TFT Displays with
+  address windows and 16 bit color (e.g. ILI9341, HX8357D, ST7735...)
+
+  Check out the links above for our tutorials and wiring diagrams
+  These displays use SPI to communicate, 4 or 5 pins are required to
+  interface (RST is optional)
+  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 Fried/Ladyada for Adafruit Industries.
+  MIT license, all text above must be included in any redistribution
+ ****************************************************/
+
+
+#include "Adafruit_SPITFT.h"
+#ifndef ARDUINO_STM32_FEATHER
+  #include "pins_arduino.h"
+#ifndef RASPI
+    #include "wiring_private.h"
+#endif
+#endif
+#include <limits.h>
+
+#include "Adafruit_SPITFT_Macros.h"
+
+
+
+// Pass 8-bit (each) R,G,B, get back 16-bit packed color
+uint16_t Adafruit_SPITFT::color565(uint8_t r, uint8_t g, uint8_t b) {
+    return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | ((b & 0xF8) >> 3);
+}
+
+Adafruit_SPITFT::Adafruit_SPITFT(uint16_t w, uint16_t h,
+				 int8_t cs, int8_t dc, int8_t mosi,
+				 int8_t sclk, int8_t rst, int8_t miso) 
+  : Adafruit_GFX(w, h) {
+    _cs   = cs;
+    _dc   = dc;
+    _rst  = rst;
+    _sclk = sclk;
+    _mosi  = mosi;
+    _miso = miso;
+    _freq = 0;
+#ifdef USE_FAST_PINIO
+    csport    = portOutputRegister(digitalPinToPort(_cs));
+    cspinmask = digitalPinToBitMask(_cs);
+    dcport    = portOutputRegister(digitalPinToPort(_dc));
+    dcpinmask = digitalPinToBitMask(_dc);
+    clkport     = portOutputRegister(digitalPinToPort(_sclk));
+    clkpinmask  = digitalPinToBitMask(_sclk);
+    mosiport    = portOutputRegister(digitalPinToPort(_mosi));
+    mosipinmask = digitalPinToBitMask(_mosi);
+    if(miso >= 0){
+        misoport    = portInputRegister(digitalPinToPort(_miso));
+        misopinmask = digitalPinToBitMask(_miso);
+    } else {
+        misoport    = 0;
+        misopinmask = 0;
+    }
+#endif
+}
+
+Adafruit_SPITFT::Adafruit_SPITFT(uint16_t w, uint16_t h,
+				 int8_t cs, int8_t dc, int8_t rst) 
+  : Adafruit_GFX(w, h) {
+    _cs   = cs;
+    _dc   = dc;
+    _rst  = rst;
+    _sclk  = -1;
+    _mosi  = -1;
+    _miso  = -1;
+    _freq = 0;
+#ifdef USE_FAST_PINIO
+    csport    = portOutputRegister(digitalPinToPort(_cs));
+    cspinmask = digitalPinToBitMask(_cs);
+    dcport    = portOutputRegister(digitalPinToPort(_dc));
+    dcpinmask = digitalPinToBitMask(_dc);
+    clkport     = 0;
+    clkpinmask  = 0;
+    mosiport    = 0;
+    mosipinmask = 0;
+    misoport    = 0;
+    misopinmask = 0;
+#endif
+}
+
+
+void Adafruit_SPITFT::initSPI(uint32_t freq)
+{
+    _freq = freq;
+
+    // Control Pins
+    pinMode(_dc, OUTPUT);
+    digitalWrite(_dc, LOW);
+    pinMode(_cs, OUTPUT);
+    digitalWrite(_cs, HIGH);
+
+    // Software SPI
+    if(_sclk >= 0){
+        pinMode(_mosi, OUTPUT);
+        digitalWrite(_mosi, LOW);
+        pinMode(_sclk, OUTPUT);
+        digitalWrite(_sclk, HIGH);
+        if(_miso >= 0){
+            pinMode(_miso, INPUT);
+        }
+    }
+
+    // Hardware SPI
+    SPI_BEGIN();
+
+    // toggle RST low to reset
+    if (_rst >= 0) {
+        pinMode(_rst, OUTPUT);
+        digitalWrite(_rst, HIGH);
+        delay(100);
+        digitalWrite(_rst, LOW);
+        delay(100);
+        digitalWrite(_rst, HIGH);
+        delay(200);
+    }
+}
+
+uint8_t Adafruit_SPITFT::spiRead() {
+    if(_sclk < 0){
+        return HSPI_READ();
+    }
+    if(_miso < 0){
+        return 0;
+    }
+    uint8_t r = 0;
+    for (uint8_t i=0; i<8; i++) {
+        SSPI_SCK_LOW();
+        SSPI_SCK_HIGH();
+        r <<= 1;
+        if (SSPI_MISO_READ()){
+            r |= 0x1;
+        }
+    }
+    return r;
+}
+
+void Adafruit_SPITFT::spiWrite(uint8_t b) {
+    if(_sclk < 0){
+        HSPI_WRITE(b);
+        return;
+    }
+    for(uint8_t bit = 0x80; bit; bit >>= 1){
+        if((b) & bit){
+            SSPI_MOSI_HIGH();
+        } else {
+            SSPI_MOSI_LOW();
+        }
+        SSPI_SCK_LOW();
+        SSPI_SCK_HIGH();
+    }
+}
+
+
+/*
+ * Transaction API
+ * */
+
+void Adafruit_SPITFT::startWrite(void){
+    SPI_BEGIN_TRANSACTION();
+    SPI_CS_LOW();
+}
+
+void Adafruit_SPITFT::endWrite(void){
+    SPI_CS_HIGH();
+    SPI_END_TRANSACTION();
+}
+
+void Adafruit_SPITFT::writeCommand(uint8_t cmd){
+    SPI_DC_LOW();
+    spiWrite(cmd);
+    SPI_DC_HIGH();
+}
+
+void Adafruit_SPITFT::pushColor(uint16_t color) {
+  startWrite();
+  SPI_WRITE16(color);
+  endWrite();
+}
+
+
+void Adafruit_SPITFT::writePixel(uint16_t color){
+    SPI_WRITE16(color);
+}
+
+void Adafruit_SPITFT::writePixels(uint16_t * colors, uint32_t len){
+    SPI_WRITE_PIXELS((uint8_t*)colors , len * 2);
+}
+
+void Adafruit_SPITFT::writeColor(uint16_t color, uint32_t len){
+#ifdef SPI_HAS_WRITE_PIXELS
+    if(_sclk >= 0){
+        for (uint32_t t=0; t<len; t++){
+            writePixel(color);
+        }
+        return;
+    }
+    static uint16_t temp[SPI_MAX_PIXELS_AT_ONCE];
+    size_t blen = (len > SPI_MAX_PIXELS_AT_ONCE)?SPI_MAX_PIXELS_AT_ONCE:len;
+    uint16_t tlen = 0;
+
+    for (uint32_t t=0; t<blen; t++){
+        temp[t] = color;
+    }
+
+    while(len){
+        tlen = (len>blen)?blen:len;
+        writePixels(temp, tlen);
+        len -= tlen;
+    }
+#else
+    uint8_t hi = color >> 8, lo = color;
+    if(_sclk < 0){ //AVR Optimization
+        for (uint32_t t=len; t; t--){
+            HSPI_WRITE(hi);
+            HSPI_WRITE(lo);
+        }
+        return;
+    }
+    for (uint32_t t=len; t; t--){
+        spiWrite(hi);
+        spiWrite(lo);
+    }
+#endif
+}
+
+void Adafruit_SPITFT::writePixel(int16_t x, int16_t y, uint16_t color) {
+    if((x < 0) ||(x >= _width) || (y < 0) || (y >= _height)) return;
+    setAddrWindow(x,y,1,1);
+    writePixel(color);
+}
+
+void Adafruit_SPITFT::writeFillRect(int16_t x, int16_t y, int16_t w, int16_t h, uint16_t color){
+    if((x >= _width) || (y >= _height)) return;
+    int16_t x2 = x + w - 1, y2 = y + h - 1;
+    if((x2 < 0) || (y2 < 0)) return;
+
+    // Clip left/top
+    if(x < 0) {
+        x = 0;
+        w = x2 + 1;
+    }
+    if(y < 0) {
+        y = 0;
+        h = y2 + 1;
+    }
+
+    // Clip right/bottom
+    if(x2 >= _width)  w = _width  - x;
+    if(y2 >= _height) h = _height - y;
+
+    int32_t len = (int32_t)w * h;
+    setAddrWindow(x, y, w, h);
+    writeColor(color, len);
+}
+
+void Adafruit_SPITFT::writeFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color){
+    writeFillRect(x, y, 1, h, color);
+}
+
+void Adafruit_SPITFT::writeFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color){
+    writeFillRect(x, y, w, 1, color);
+}
+
+void Adafruit_SPITFT::drawPixel(int16_t x, int16_t y, uint16_t color){
+    startWrite();
+    writePixel(x, y, color);
+    endWrite();
+}
+
+void Adafruit_SPITFT::drawFastVLine(int16_t x, int16_t y,
+        int16_t h, uint16_t color) {
+    startWrite();
+    writeFastVLine(x, y, h, color);
+    endWrite();
+}
+
+void Adafruit_SPITFT::drawFastHLine(int16_t x, int16_t y,
+        int16_t w, uint16_t color) {
+    startWrite();
+    writeFastHLine(x, y, w, color);
+    endWrite();
+}
+
+void Adafruit_SPITFT::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
+        uint16_t color) {
+    startWrite();
+    writeFillRect(x,y,w,h,color);
+    endWrite();
+}
+
+// Adapted from https://github.com/PaulStoffregen/ILI9341_t3
+// by Marc MERLIN. See examples/pictureEmbed to use this.
+// 5/6/2017: function name and arguments have changed for compatibility
+// with current GFX library and to avoid naming problems in prior
+// implementation.  Formerly drawBitmap() with arguments in different order.
+void Adafruit_SPITFT::drawRGBBitmap(int16_t x, int16_t y,
+  uint16_t *pcolors, int16_t w, int16_t h) {
+
+    int16_t x2, y2; // Lower-right coord
+    if(( x             >= _width ) ||      // Off-edge right
+       ( y             >= _height) ||      // " top
+       ((x2 = (x+w-1)) <  0      ) ||      // " left
+       ((y2 = (y+h-1)) <  0)     ) return; // " bottom
+
+    int16_t bx1=0, by1=0, // Clipped top-left within bitmap
+            saveW=w;      // Save original bitmap width value
+    if(x < 0) { // Clip left
+        w  +=  x;
+        bx1 = -x;
+        x   =  0;
+    }
+    if(y < 0) { // Clip top
+        h  +=  y;
+        by1 = -y;
+        y   =  0;
+    }
+    if(x2 >= _width ) w = _width  - x; // Clip right
+    if(y2 >= _height) h = _height - y; // Clip bottom
+
+    pcolors += by1 * saveW + bx1; // Offset bitmap ptr to clipped top-left
+    startWrite();
+    setAddrWindow(x, y, w, h); // Clipped area
+    while(h--) { // For each (clipped) scanline...
+      writePixels(pcolors, w); // Push one (clipped) row
+      pcolors += saveW; // Advance pointer by one full (unclipped) line
+    }
+    endWrite();
+}