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Adafruit-ST7735-Library/Adafruit_ST7735.cpp
Michael Hope 51dddbdc17 lcd: use writePattern for faster erases and lines. 
The ESP8266 SPI implementation has a 'writePattern' function that
writes a repeating sequence (in this case a solid colour) to the SPI
port.  This fills up the FIFO and increases the bus utilisation.

Using this for clearing the screen cuts the demo run time from 4721 ms
to 3601 ms.  Also using this for the fast lines cuts the run time to
3424 ms.

Signed-off-by: Michael Hope <mlhx@google.com>
2015-05-17 16:19:17 +02:00

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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
The 1.8" TFT shield
----> https://www.adafruit.com/product/802
The 1.44" TFT breakout
----> https://www.adafruit.com/product/2088
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 <limits.h>
#include "pins_arduino.h"
#include "wiring_private.h"
#include <SPI.h>
#if !defined(ST7735_USE_HWSPI_ONLY)
// Constructor when using software SPI. All output pins are configurable.
Adafruit_ST7735::Adafruit_ST7735(int8_t cs, int8_t rs, int8_t sid, int8_t sclk, int8_t rst)
: Adafruit_GFX(ST7735_TFTWIDTH, ST7735_TFTHEIGHT_18)
{
_cs = cs;
_rs = rs;
_sid = sid;
_sclk = sclk;
_rst = rst;
hwSPI = false;
}
#endif
// 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(int8_t cs, int8_t rs, int8_t rst)
: Adafruit_GFX(ST7735_TFTWIDTH, ST7735_TFTHEIGHT_18) {
_cs = cs;
_rs = rs;
_rst = rst;
hwSPI = true;
_sid = _sclk = 0;
}
#if defined(CORE_TEENSY) && !defined(__AVR__)
#define __AVR__
#endif
#if defined(ST7735_USE_HWSPI_ONLY)
inline void Adafruit_ST7735::spiwrite(uint8_t c) {
SPI.transfer(c);
}
#elif defined(__AVR__)
inline void Adafruit_ST7735::spiwrite(uint8_t c) {
//Serial.println(c, HEX);
if (hwSPI) {
SPDR = c;
while(!(SPSR & _BV(SPIF)));
} 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;
}
}
}
#elif defined(__SAM3X8E__)
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->PIO_SODR |= datapinmask;
else dataport->PIO_CODR |= datapinmask;
clkport->PIO_SODR |= clkpinmask;
clkport->PIO_CODR |= clkpinmask;
}
}
}
#else
#error Unsupported board.
#endif
#if defined(ST7735_USE_HWSPI_WRITE16)
inline void Adafruit_ST7735::spiwrite16(uint16_t v) {
SPI.write16(v);
}
#else
inline void Adafruit_ST7735::spiwrite16(uint16_t v) {
spiwrite((uint8_t)(v >> 8));
spiwrite((uint8_t)(v >> 0));
}
#endif
#if defined(ST7735_USE_GENERIC_IO)
inline void Adafruit_ST7735::setCS(bool level) {
digitalWrite(_cs, level);
}
inline void Adafruit_ST7735::setRS(bool level) {
digitalWrite(_rs, level);
}
#elif defined(__AVR__)
inline void Adafruit_ST7735::setCS(bool level) {
if (level) {
*csport |= cspinmask;
} else {
*csport &= ~cspinmask;
}
}
inline void Adafruit_ST7735::setRS(bool level) {
if (level) {
*rsport |= rspinmask;
} else {
*rsport &= ~rspinmask;
}
}
#elif defined(__SAM3X8E__)
inline void Adafruit_ST7735::setCS(bool level) {
if (level) {
csport->PIO_SODR |= cspinmask;
} else {
csport->PIO_CODR |= cspinmask;
}
}
inline void Adafruit_ST7735::setRS(bool level) {
if (level) {
rsport->PIO_SODR |= rspinmask;
} else {
rsport->PIO_CODR |= rspinmask;
}
}
#else
#error Unsupported board.
#endif
void Adafruit_ST7735::writecommand(uint8_t c) {
setRS(false);
setCS(false);
//Serial.print("C ");
spiwrite(c);
setCS(true);
}
void Adafruit_ST7735::writedata(uint8_t c) {
setRS(true);
setCS(false);
//Serial.print("D ");
spiwrite(c);
setCS(true);
}
void Adafruit_ST7735::writedata16(uint16_t c) {
setRS(true);
setCS(false);
//Serial.print("D ");
spiwrite16(c);
setCS(true);
}
// 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
static const uint8_t PROGMEM
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
Rcmd2green144[] = { // Init for 7735R, part 2 (green 1.44 tab)
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, 0x7F }, // XEND = 127
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(const 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(const uint8_t *cmdList) {
colstart = rowstart = 0; // May be overridden in init func
pinMode(_rs, OUTPUT);
pinMode(_cs, OUTPUT);
#ifdef __AVR__
csport = portOutputRegister(digitalPinToPort(_cs));
rsport = portOutputRegister(digitalPinToPort(_rs));
#endif
#if defined(__SAM3X8E__)
csport = digitalPinToPort(_cs);
rsport = digitalPinToPort(_rs);
#endif
#if !defined(ST7735_USE_GENERIC_IO)
cspinmask = digitalPinToBitMask(_cs);
rspinmask = digitalPinToBitMask(_rs);
#endif
if(hwSPI) { // Using hardware SPI
SPI.begin();
#ifdef __AVR__
SPI.setClockDivider(SPI_CLOCK_DIV4); // 4 MHz (half speed)
//Due defaults to 4mHz (clock divider setting of 21)
#elif defined(__SAM3X8E__)
SPI.setClockDivider(21); // 4 MHz
//Due defaults to 4mHz (clock divider setting of 21), but we'll set it anyway
#else
// Use 8MHz for other boards.
SPI.setClockDivider(SPI_CLOCK_DIV2); // 8 MHz
#endif
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE0);
} else {
pinMode(_sclk, OUTPUT);
pinMode(_sid , OUTPUT);
#ifdef __AVR__
clkport = portOutputRegister(digitalPinToPort(_sclk));
dataport = portOutputRegister(digitalPinToPort(_sid));
#endif
#if defined(__SAM3X8E__)
clkport = digitalPinToPort(_sclk);
dataport = digitalPinToPort(_sid);
#endif
#if !defined(ST7735_USE_GENERIC_IO)
clkpinmask = digitalPinToBitMask(_sclk);
datapinmask = digitalPinToBitMask(_sid);
#endif
#ifdef __AVR__
*clkport &= ~clkpinmask;
*dataport &= ~datapinmask;
#endif
#if defined(__SAM3X8E__)
clkport ->PIO_CODR |= clkpinmask; // Set control bits to LOW (idle)
dataport->PIO_CODR |= datapinmask; // Signals are ACTIVE HIGH
#endif
}
// toggle RST low to reset; CS low so it'll listen to us
setCS(false);
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 if(options == INITR_144GREENTAB) {
_height = ST7735_TFTHEIGHT_144;
commandList(Rcmd2green144);
colstart = 2;
rowstart = 3;
} else {
// colstart, rowstart left at default '0' values
commandList(Rcmd2red);
}
commandList(Rcmd3);
// if black, change MADCTL color filter
if (options == INITR_BLACKTAB) {
writecommand(ST7735_MADCTL);
writedata(0xC0);
}
tabcolor = options;
}
void Adafruit_ST7735::setAddrWindow(uint8_t x0, uint8_t y0, uint8_t x1,
uint8_t y1) {
writecommand(ST7735_CASET); // Column addr set
writedata16(x0+colstart); // XSTART
writedata16(x1+colstart); // XEND
writecommand(ST7735_RASET); // Row addr set
writedata16(y0+rowstart); // YSTART
writedata16(y1+rowstart); // YEND
writecommand(ST7735_RAMWR); // write to RAM
}
void Adafruit_ST7735::pushColor(uint16_t color) {
setRS(true);
setCS(false);
spiwrite16(color);
setCS(true);
}
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);
writedata16(color);
}
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);
writeColor(color, h);
}
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);
writeColor(color, w);
}
void Adafruit_ST7735::fillScreen(uint16_t color) {
fillRect(0, 0, _width, _height, color);
}
void Adafruit_ST7735::writeColor(uint16_t color, uint16_t count) {
setRS(true);
setCS(false);
#if defined(ST7735_USE_HWSPI_WRITEPATTERN)
uint8_t pattern[] = { (uint8_t)(color >> 8), (uint8_t)(color >> 0) };
SPI.writePattern(pattern, sizeof(pattern), count);
#else
for (; count != 0; count--) {
spiwrite16(color);
}
#endif
setCS(true);
}
// 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;
setAddrWindow(x, y, x+w-1, y+h-1);
writeColor(color, w*h);
}
// Pass 8-bit (each) R,G,B, get back 16-bit packed color
uint16_t Adafruit_ST7735::Color565(uint8_t r, uint8_t g, uint8_t b) {
return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
}
#define MADCTL_MY 0x80
#define MADCTL_MX 0x40
#define MADCTL_MV 0x20
#define MADCTL_ML 0x10
#define MADCTL_RGB 0x00
#define MADCTL_BGR 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:
if (tabcolor == INITR_BLACKTAB) {
writedata(MADCTL_MX | MADCTL_MY | MADCTL_RGB);
} else {
writedata(MADCTL_MX | MADCTL_MY | MADCTL_BGR);
}
_width = ST7735_TFTWIDTH;
if (tabcolor == INITR_144GREENTAB)
_height = ST7735_TFTHEIGHT_144;
else
_height = ST7735_TFTHEIGHT_18;
break;
case 1:
if (tabcolor == INITR_BLACKTAB) {
writedata(MADCTL_MY | MADCTL_MV | MADCTL_RGB);
} else {
writedata(MADCTL_MY | MADCTL_MV | MADCTL_BGR);
}
if (tabcolor == INITR_144GREENTAB)
_width = ST7735_TFTHEIGHT_144;
else
_width = ST7735_TFTHEIGHT_18;
_height = ST7735_TFTWIDTH;
break;
case 2:
if (tabcolor == INITR_BLACKTAB) {
writedata(MADCTL_RGB);
} else {
writedata(MADCTL_BGR);
}
_width = ST7735_TFTWIDTH;
if (tabcolor == INITR_144GREENTAB)
_height = ST7735_TFTHEIGHT_144;
else
_height = ST7735_TFTHEIGHT_18;
break;
case 3:
if (tabcolor == INITR_BLACKTAB) {
writedata(MADCTL_MX | MADCTL_MV | MADCTL_RGB);
} else {
writedata(MADCTL_MX | MADCTL_MV | MADCTL_BGR);
}
if (tabcolor == INITR_144GREENTAB)
_width = ST7735_TFTHEIGHT_144;
else
_width = ST7735_TFTHEIGHT_18;
_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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