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+/***************************************************
+ This is a library for the Adafruit 1.8" SPI display.
+ This library works with the Adafruit 1.8" TFT Breakout w/SD card
+ ----> http://www.adafruit.com/products/358
+ as well as Adafruit raw 1.8" TFT display
+ ----> http://www.adafruit.com/products/618
+
+ 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_ST7735.h"
+#include <avr/pgmspace.h>
+#include <limits.h>
+#include "pins_arduino.h"
+#include "wiring_private.h"
+#include <SPI.h>
+
+inline uint16_t swapcolor(uint16_t x) {
+ return (x << 11) | (x & 0x07E0) | (x >> 11);
+}
+
+
+// Constructor when using software SPI. All output pins are configurable.
+Adafruit_ST7735::Adafruit_ST7735(uint8_t cs, uint8_t rs, uint8_t sid,
+ uint8_t sclk, uint8_t rst) {
+ _cs = cs;
+ _rs = rs;
+ _sid = sid;
+ _sclk = sclk;
+ _rst = rst;
+ hwSPI = false;
+}
+
+
+// Constructor when using hardware SPI. Faster, but must use SPI pins
+// specific to each board type (e.g. 11,13 for Uno, 51,52 for Mega, etc.)
+Adafruit_ST7735::Adafruit_ST7735(uint8_t cs, uint8_t rs, uint8_t rst) {
+ _cs = cs;
+ _rs = rs;
+ _rst = rst;
+ hwSPI = true;
+ _sid = _sclk = 0;
+}
+
+
+inline void Adafruit_ST7735::spiwrite(uint8_t c) {
+
+ //Serial.println(c, HEX);
+
+ if (hwSPI) {
+ SPI.transfer(c);
+ } else {
+ // Fast SPI bitbang swiped from LPD8806 library
+ for(uint8_t bit = 0x80; bit; bit >>= 1) {
+ if(c & bit) *dataport |= datapinmask;
+ else *dataport &= ~datapinmask;
+ *clkport |= clkpinmask;
+ *clkport &= ~clkpinmask;
+ }
+ }
+}
+
+
+void Adafruit_ST7735::writecommand(uint8_t c) {
+ *rsport &= ~rspinmask;
+ *csport &= ~cspinmask;
+
+ //Serial.print("C ");
+ spiwrite(c);
+
+ *csport |= cspinmask;
+}
+
+
+void Adafruit_ST7735::writedata(uint8_t c) {
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+
+ //Serial.print("D ");
+ spiwrite(c);
+
+ *csport |= cspinmask;
+}
+
+
+// Rather than a bazillion writecommand() and writedata() calls, screen
+// initialization commands and arguments are organized in these tables
+// stored in PROGMEM. The table may look bulky, but that's mostly the
+// formatting -- storage-wise this is hundreds of bytes more compact
+// than the equivalent code. Companion function follows.
+#define DELAY 0x80
+PROGMEM static prog_uchar
+ Bcmd[] = { // Initialization commands for 7735B screens
+ 18, // 18 commands in list:
+ ST7735_SWRESET, DELAY, // 1: Software reset, no args, w/delay
+ 50, // 50 ms delay
+ ST7735_SLPOUT , DELAY, // 2: Out of sleep mode, no args, w/delay
+ 255, // 255 = 500 ms delay
+ ST7735_COLMOD , 1+DELAY, // 3: Set color mode, 1 arg + delay:
+ 0x05, // 16-bit color
+ 10, // 10 ms delay
+ ST7735_FRMCTR1, 3+DELAY, // 4: Frame rate control, 3 args + delay:
+ 0x00, // fastest refresh
+ 0x06, // 6 lines front porch
+ 0x03, // 3 lines back porch
+ 10, // 10 ms delay
+ ST7735_MADCTL , 1 , // 5: Memory access ctrl (directions), 1 arg:
+ 0x08, // Row addr/col addr, bottom to top refresh
+ ST7735_DISSET5, 2 , // 6: Display settings #5, 2 args, no delay:
+ 0x15, // 1 clk cycle nonoverlap, 2 cycle gate
+ // rise, 3 cycle osc equalize
+ 0x02, // Fix on VTL
+ ST7735_INVCTR , 1 , // 7: Display inversion control, 1 arg:
+ 0x0, // Line inversion
+ ST7735_PWCTR1 , 2+DELAY, // 8: Power control, 2 args + delay:
+ 0x02, // GVDD = 4.7V
+ 0x70, // 1.0uA
+ 10, // 10 ms delay
+ ST7735_PWCTR2 , 1 , // 9: Power control, 1 arg, no delay:
+ 0x05, // VGH = 14.7V, VGL = -7.35V
+ ST7735_PWCTR3 , 2 , // 10: Power control, 2 args, no delay:
+ 0x01, // Opamp current small
+ 0x02, // Boost frequency
+ ST7735_VMCTR1 , 2+DELAY, // 11: Power control, 2 args + delay:
+ 0x3C, // VCOMH = 4V
+ 0x38, // VCOML = -1.1V
+ 10, // 10 ms delay
+ ST7735_PWCTR6 , 2 , // 12: Power control, 2 args, no delay:
+ 0x11, 0x15,
+ ST7735_GMCTRP1,16 , // 13: Magical unicorn dust, 16 args, no delay:
+ 0x09, 0x16, 0x09, 0x20, // (seriously though, not sure what
+ 0x21, 0x1B, 0x13, 0x19, // these config values represent)
+ 0x17, 0x15, 0x1E, 0x2B,
+ 0x04, 0x05, 0x02, 0x0E,
+ ST7735_GMCTRN1,16+DELAY, // 14: Sparkles and rainbows, 16 args + delay:
+ 0x0B, 0x14, 0x08, 0x1E, // (ditto)
+ 0x22, 0x1D, 0x18, 0x1E,
+ 0x1B, 0x1A, 0x24, 0x2B,
+ 0x06, 0x06, 0x02, 0x0F,
+ 10, // 10 ms delay
+ ST7735_CASET , 4 , // 15: Column addr set, 4 args, no delay:
+ 0x00, 0x02, // XSTART = 2
+ 0x00, 0x81, // XEND = 129
+ ST7735_RASET , 4 , // 16: Row addr set, 4 args, no delay:
+ 0x00, 0x02, // XSTART = 1
+ 0x00, 0x81, // XEND = 160
+ ST7735_NORON , DELAY, // 17: Normal display on, no args, w/delay
+ 10, // 10 ms delay
+ ST7735_DISPON , DELAY, // 18: Main screen turn on, no args, w/delay
+ 255 }, // 255 = 500 ms delay
+
+ Rcmd1[] = { // Init for 7735R, part 1 (red or green tab)
+ 15, // 15 commands in list:
+ ST7735_SWRESET, DELAY, // 1: Software reset, 0 args, w/delay
+ 150, // 150 ms delay
+ ST7735_SLPOUT , DELAY, // 2: Out of sleep mode, 0 args, w/delay
+ 255, // 500 ms delay
+ ST7735_FRMCTR1, 3 , // 3: Frame rate ctrl - normal mode, 3 args:
+ 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
+ ST7735_FRMCTR2, 3 , // 4: Frame rate control - idle mode, 3 args:
+ 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
+ ST7735_FRMCTR3, 6 , // 5: Frame rate ctrl - partial mode, 6 args:
+ 0x01, 0x2C, 0x2D, // Dot inversion mode
+ 0x01, 0x2C, 0x2D, // Line inversion mode
+ ST7735_INVCTR , 1 , // 6: Display inversion ctrl, 1 arg, no delay:
+ 0x07, // No inversion
+ ST7735_PWCTR1 , 3 , // 7: Power control, 3 args, no delay:
+ 0xA2,
+ 0x02, // -4.6V
+ 0x84, // AUTO mode
+ ST7735_PWCTR2 , 1 , // 8: Power control, 1 arg, no delay:
+ 0xC5, // VGH25 = 2.4C VGSEL = -10 VGH = 3 * AVDD
+ ST7735_PWCTR3 , 2 , // 9: Power control, 2 args, no delay:
+ 0x0A, // Opamp current small
+ 0x00, // Boost frequency
+ ST7735_PWCTR4 , 2 , // 10: Power control, 2 args, no delay:
+ 0x8A, // BCLK/2, Opamp current small & Medium low
+ 0x2A,
+ ST7735_PWCTR5 , 2 , // 11: Power control, 2 args, no delay:
+ 0x8A, 0xEE,
+ ST7735_VMCTR1 , 1 , // 12: Power control, 1 arg, no delay:
+ 0x0E,
+ ST7735_INVOFF , 0 , // 13: Don't invert display, no args, no delay
+ ST7735_MADCTL , 1 , // 14: Memory access control (directions), 1 arg:
+ 0xC8, // row addr/col addr, bottom to top refresh
+ ST7735_COLMOD , 1 , // 15: set color mode, 1 arg, no delay:
+ 0x05 }, // 16-bit color
+
+ Rcmd2green[] = { // Init for 7735R, part 2 (green tab only)
+ 2, // 2 commands in list:
+ ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay:
+ 0x00, 0x02, // XSTART = 0
+ 0x00, 0x7F+0x02, // XEND = 127
+ ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay:
+ 0x00, 0x01, // XSTART = 0
+ 0x00, 0x9F+0x01 }, // XEND = 159
+ Rcmd2red[] = { // Init for 7735R, part 2 (red tab only)
+ 2, // 2 commands in list:
+ ST7735_CASET , 4 , // 1: Column addr set, 4 args, no delay:
+ 0x00, 0x00, // XSTART = 0
+ 0x00, 0x7F, // XEND = 127
+ ST7735_RASET , 4 , // 2: Row addr set, 4 args, no delay:
+ 0x00, 0x00, // XSTART = 0
+ 0x00, 0x9F }, // XEND = 159
+
+ Rcmd3[] = { // Init for 7735R, part 3 (red or green tab)
+ 4, // 4 commands in list:
+ ST7735_GMCTRP1, 16 , // 1: Magical unicorn dust, 16 args, no delay:
+ 0x02, 0x1c, 0x07, 0x12,
+ 0x37, 0x32, 0x29, 0x2d,
+ 0x29, 0x25, 0x2B, 0x39,
+ 0x00, 0x01, 0x03, 0x10,
+ ST7735_GMCTRN1, 16 , // 2: Sparkles and rainbows, 16 args, no delay:
+ 0x03, 0x1d, 0x07, 0x06,
+ 0x2E, 0x2C, 0x29, 0x2D,
+ 0x2E, 0x2E, 0x37, 0x3F,
+ 0x00, 0x00, 0x02, 0x10,
+ ST7735_NORON , DELAY, // 3: Normal display on, no args, w/delay
+ 10, // 10 ms delay
+ ST7735_DISPON , DELAY, // 4: Main screen turn on, no args w/delay
+ 100 }; // 100 ms delay
+
+
+// Companion code to the above tables. Reads and issues
+// a series of LCD commands stored in PROGMEM byte array.
+void Adafruit_ST7735::commandList(uint8_t *addr) {
+
+ uint8_t numCommands, numArgs;
+ uint16_t ms;
+
+ numCommands = pgm_read_byte(addr++); // Number of commands to follow
+ while(numCommands--) { // For each command...
+ writecommand(pgm_read_byte(addr++)); // Read, issue command
+ numArgs = pgm_read_byte(addr++); // Number of args to follow
+ ms = numArgs & DELAY; // If hibit set, delay follows args
+ numArgs &= ~DELAY; // Mask out delay bit
+ while(numArgs--) { // For each argument...
+ writedata(pgm_read_byte(addr++)); // Read, issue argument
+ }
+
+ if(ms) {
+ ms = pgm_read_byte(addr++); // Read post-command delay time (ms)
+ if(ms == 255) ms = 500; // If 255, delay for 500 ms
+ delay(ms);
+ }
+ }
+}
+
+
+// Initialization code common to both 'B' and 'R' type displays
+void Adafruit_ST7735::commonInit(uint8_t *cmdList) {
+
+ constructor(ST7735_TFTWIDTH, ST7735_TFTHEIGHT);
+ colstart = rowstart = 0; // May be overridden in init func
+
+ pinMode(_rs, OUTPUT);
+ pinMode(_cs, OUTPUT);
+ csport = portOutputRegister(digitalPinToPort(_cs));
+ cspinmask = digitalPinToBitMask(_cs);
+ rsport = portOutputRegister(digitalPinToPort(_rs));
+ rspinmask = digitalPinToBitMask(_rs);
+
+ if(hwSPI) { // Using hardware SPI
+ SPI.begin();
+#if defined(ARDUINO_ARCH_SAM)
+ SPI.setClockDivider(24); // 4 MHz (half speed)
+#else
+ SPI.setClockDivider(SPI_CLOCK_DIV4); // 4 MHz (half speed)
+#endif
+ SPI.setBitOrder(MSBFIRST);
+ SPI.setDataMode(SPI_MODE0);
+ } else {
+ pinMode(_sclk, OUTPUT);
+ pinMode(_sid , OUTPUT);
+ clkport = portOutputRegister(digitalPinToPort(_sclk));
+ clkpinmask = digitalPinToBitMask(_sclk);
+ dataport = portOutputRegister(digitalPinToPort(_sid));
+ datapinmask = digitalPinToBitMask(_sid);
+ *clkport &= ~clkpinmask;
+ *dataport &= ~datapinmask;
+ }
+
+ // toggle RST low to reset; CS low so it'll listen to us
+ *csport &= ~cspinmask;
+ if (_rst) {
+ pinMode(_rst, OUTPUT);
+ digitalWrite(_rst, HIGH);
+ delay(500);
+ digitalWrite(_rst, LOW);
+ delay(500);
+ digitalWrite(_rst, HIGH);
+ delay(500);
+ }
+
+ if(cmdList) commandList(cmdList);
+}
+
+
+// Initialization for ST7735B screens
+void Adafruit_ST7735::initB(void) {
+ commonInit(Bcmd);
+}
+
+
+// Initialization for ST7735R screens (green or red tabs)
+void Adafruit_ST7735::initR(uint8_t options) {
+ commonInit(Rcmd1);
+ if(options == INITR_GREENTAB) {
+ commandList(Rcmd2green);
+ colstart = 2;
+ rowstart = 1;
+ } else {
+ // colstart, rowstart left at default '0' values
+ commandList(Rcmd2red);
+ }
+ commandList(Rcmd3);
+ tabcolor = options;
+}
+
+
+void Adafruit_ST7735::setAddrWindow(uint8_t x0, uint8_t y0, uint8_t x1,
+ uint8_t y1) {
+
+ writecommand(ST7735_CASET); // Column addr set
+ writedata(0x00);
+ writedata(x0+colstart); // XSTART
+ writedata(0x00);
+ writedata(x1+colstart); // XEND
+
+ writecommand(ST7735_RASET); // Row addr set
+ writedata(0x00);
+ writedata(y0+rowstart); // YSTART
+ writedata(0x00);
+ writedata(y1+rowstart); // YEND
+
+ writecommand(ST7735_RAMWR); // write to RAM
+}
+
+
+void Adafruit_ST7735::pushColor(uint16_t color) {
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+
+ if (tabcolor == INITR_BLACKTAB) color = swapcolor(color);
+ spiwrite(color >> 8);
+ spiwrite(color);
+
+ *csport |= cspinmask;
+}
+
+void Adafruit_ST7735::drawPixel(int16_t x, int16_t y, uint16_t color) {
+
+ if((x < 0) ||(x >= _width) || (y < 0) || (y >= _height)) return;
+
+ setAddrWindow(x,y,x+1,y+1);
+
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+
+ if (tabcolor == INITR_BLACKTAB) color = swapcolor(color);
+
+ spiwrite(color >> 8);
+ spiwrite(color);
+
+ *csport |= cspinmask;
+}
+
+
+void Adafruit_ST7735::drawFastVLine(int16_t x, int16_t y, int16_t h,
+ uint16_t color) {
+
+ // Rudimentary clipping
+ if((x >= _width) || (y >= _height)) return;
+ if((y+h-1) >= _height) h = _height-y;
+ setAddrWindow(x, y, x, y+h-1);
+
+ if (tabcolor == INITR_BLACKTAB) color = swapcolor(color);
+
+ uint8_t hi = color >> 8, lo = color;
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+ while (h--) {
+ spiwrite(hi);
+ spiwrite(lo);
+ }
+ *csport |= cspinmask;
+}
+
+
+void Adafruit_ST7735::drawFastHLine(int16_t x, int16_t y, int16_t w,
+ uint16_t color) {
+
+ // Rudimentary clipping
+ if((x >= _width) || (y >= _height)) return;
+ if((x+w-1) >= _width) w = _width-x;
+ setAddrWindow(x, y, x+w-1, y);
+
+ if (tabcolor == INITR_BLACKTAB) color = swapcolor(color);
+
+ uint8_t hi = color >> 8, lo = color;
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+ while (w--) {
+ spiwrite(hi);
+ spiwrite(lo);
+ }
+ *csport |= cspinmask;
+}
+
+
+
+void Adafruit_ST7735::fillScreen(uint16_t color) {
+ fillRect(0, 0, _width, _height, color);
+}
+
+
+
+// fill a rectangle
+void Adafruit_ST7735::fillRect(int16_t x, int16_t y, int16_t w, int16_t h,
+ uint16_t color) {
+
+ // rudimentary clipping (drawChar w/big text requires this)
+ if((x >= _width) || (y >= _height)) return;
+ if((x + w - 1) >= _width) w = _width - x;
+ if((y + h - 1) >= _height) h = _height - y;
+
+ if (tabcolor == INITR_BLACKTAB) color = swapcolor(color);
+
+ setAddrWindow(x, y, x+w-1, y+h-1);
+
+ uint8_t hi = color >> 8, lo = color;
+ *rsport |= rspinmask;
+ *csport &= ~cspinmask;
+ for(y=h; y>0; y--) {
+ for(x=w; x>0; x--) {
+ spiwrite(hi);
+ spiwrite(lo);
+ }
+ }
+
+ *csport |= cspinmask;
+}
+
+
+#define MADCTL_MY 0x80
+#define MADCTL_MX 0x40
+#define MADCTL_MV 0x20
+#define MADCTL_ML 0x10
+#define MADCTL_RGB 0x08
+#define MADCTL_MH 0x04
+
+void Adafruit_ST7735::setRotation(uint8_t m) {
+
+ writecommand(ST7735_MADCTL);
+ rotation = m % 4; // can't be higher than 3
+ switch (rotation) {
+ case 0:
+ writedata(MADCTL_MX | MADCTL_MY | MADCTL_RGB);
+ _width = ST7735_TFTWIDTH;
+ _height = ST7735_TFTHEIGHT;
+ break;
+ case 1:
+ writedata(MADCTL_MY | MADCTL_MV | MADCTL_RGB);
+ _width = ST7735_TFTHEIGHT;
+ _height = ST7735_TFTWIDTH;
+ break;
+ case 2:
+ writedata(MADCTL_RGB);
+ _width = ST7735_TFTWIDTH;
+ _height = ST7735_TFTHEIGHT;
+ break;
+ case 3:
+ writedata(MADCTL_MX | MADCTL_MV | MADCTL_RGB);
+ _width = ST7735_TFTHEIGHT;
+ _height = ST7735_TFTWIDTH;
+ break;
+ }
+}
+
+
+void Adafruit_ST7735::invertDisplay(boolean i) {
+ writecommand(i ? ST7735_INVON : ST7735_INVOFF);
+}
+
+
+////////// stuff not actively being used, but kept for posterity
+/*
+
+ uint8_t Adafruit_ST7735::spiread(void) {
+ uint8_t r = 0;
+ if (_sid > 0) {
+ r = shiftIn(_sid, _sclk, MSBFIRST);
+ } else {
+ //SID_DDR &= ~_BV(SID);
+ //int8_t i;
+ //for (i=7; i>=0; i--) {
+ // SCLK_PORT &= ~_BV(SCLK);
+ // r <<= 1;
+ // r |= (SID_PIN >> SID) & 0x1;
+ // SCLK_PORT |= _BV(SCLK);
+ //}
+ //SID_DDR |= _BV(SID);
+
+ }
+ return r;
+ }
+
+
+ void Adafruit_ST7735::dummyclock(void) {
+
+ if (_sid > 0) {
+ digitalWrite(_sclk, LOW);
+ digitalWrite(_sclk, HIGH);
+ } else {
+ // SCLK_PORT &= ~_BV(SCLK);
+ //SCLK_PORT |= _BV(SCLK);
+ }
+ }
+ uint8_t Adafruit_ST7735::readdata(void) {
+ *portOutputRegister(rsport) |= rspin;
+
+ *portOutputRegister(csport) &= ~ cspin;
+
+ uint8_t r = spiread();
+
+ *portOutputRegister(csport) |= cspin;
+
+ return r;
+
+ }
+
+ uint8_t Adafruit_ST7735::readcommand8(uint8_t c) {
+ digitalWrite(_rs, LOW);
+
+ *portOutputRegister(csport) &= ~ cspin;
+
+ spiwrite(c);
+
+ digitalWrite(_rs, HIGH);
+ pinMode(_sid, INPUT); // input!
+ digitalWrite(_sid, LOW); // low
+ spiread();
+ uint8_t r = spiread();
+
+
+ *portOutputRegister(csport) |= cspin;
+
+
+ pinMode(_sid, OUTPUT); // back to output
+ return r;
+ }
+
+
+ uint16_t Adafruit_ST7735::readcommand16(uint8_t c) {
+ digitalWrite(_rs, LOW);
+ if (_cs)
+ digitalWrite(_cs, LOW);
+
+ spiwrite(c);
+ pinMode(_sid, INPUT); // input!
+ uint16_t r = spiread();
+ r <<= 8;
+ r |= spiread();
+ if (_cs)
+ digitalWrite(_cs, HIGH);
+
+ pinMode(_sid, OUTPUT); // back to output
+ return r;
+ }
+
+ uint32_t Adafruit_ST7735::readcommand32(uint8_t c) {
+ digitalWrite(_rs, LOW);
+ if (_cs)
+ digitalWrite(_cs, LOW);
+ spiwrite(c);
+ pinMode(_sid, INPUT); // input!
+
+ dummyclock();
+ dummyclock();
+
+ uint32_t r = spiread();
+ r <<= 8;
+ r |= spiread();
+ r <<= 8;
+ r |= spiread();
+ r <<= 8;
+ r |= spiread();
+ if (_cs)
+ digitalWrite(_cs, HIGH);
+
+ pinMode(_sid, OUTPUT); // back to output
+ return r;
+ }
+
+ */
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