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TFT_eeSPI.cpp
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TFT_eeSPI.cpp
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/*
TFT low level procedures
Copyright (c) 2024, rspber (https://github.com/rspber)
Based on: TFT_eSPI
Originally notes below:
*/
/***************************************************
Arduino TFT graphics library targeted at 32-bit
processors such as ESP32, ESP8266 and STM32.
This is a stand-alone library that contains the
hardware driver, the graphics functions and the
proportional fonts.
The larger fonts are Run Length Encoded to reduce their
size.
Created by Bodmer 2/12/16
Last update by Bodmer 20/03/20
****************************************************/
#include "TFT_eeSPI.h"
#if defined (ESP32)
#if defined(CONFIG_IDF_TARGET_ESP32S3)
#include "Processors/TFT_eSPI_ESP32_S3.c" // Tested with SPI and 8-bit parallel
#elif defined(CONFIG_IDF_TARGET_ESP32C3)
#include "Processors/TFT_eSPI_ESP32_C3.c" // Tested with SPI (8-bit parallel will probably work too!)
#else
#include "Processors/TFT_eSPI_ESP32.c"
#endif
#elif defined (ARDUINO_ARCH_ESP8266)
#include "Processors/TFT_eSPI_ESP8266.c"
#elif defined (STM32) // (_VARIANT_ARDUINO_STM32_) stm32_def.h
#include "Processors/TFT_eSPI_STM32.c"
#elif defined (ARDUINO_ARCH_RP2040) || defined (ARDUINO_ARCH_MBED) // Raspberry Pi Pico
#include "Processors/TFT_eSPI_RP2040.c"
#else
#include "Processors/TFT_eSPI_Generic.c"
#endif
#ifndef SPI_BUSY_CHECK
#define SPI_BUSY_CHECK
#endif
/***************************************************************************************
** Function name: Legacy - deprecated
** Description: Start/end transaction
***************************************************************************************/
void TFT_eeSPI::spi_begin() {begin_tft_write();}
void TFT_eeSPI::spi_end() { end_tft_write();}
void TFT_eeSPI::spi_begin_read() {begin_tft_read(); }
void TFT_eeSPI::spi_end_read() { end_tft_read(); }
/***************************************************************************************
** Function name: begin_tft_write (was called spi_begin)
** Description: Start SPI transaction for writes and select TFT
***************************************************************************************/
void TFT_eeSPI::begin_tft_write(void){
if (locked) {
locked = false; // Flag to show SPI access now unlocked
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.beginTransaction(SPISettings(SPI_FREQUENCY, MSBFIRST, TFT_SPI_MODE));
#endif
CS_L;
SET_BUS_WRITE_MODE; // Some processors (e.g. ESP32) allow recycling the tx buffer when rx is not used
}
}
// Non-inlined version to permit override
void TFT_eeSPI::begin_nin_write(void){
if (locked) {
locked = false; // Flag to show SPI access now unlocked
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.beginTransaction(SPISettings(SPI_FREQUENCY, MSBFIRST, TFT_SPI_MODE));
#endif
CS_L;
SET_BUS_WRITE_MODE; // Some processors (e.g. ESP32) allow recycling the tx buffer when rx is not used
}
}
/***************************************************************************************
** Function name: end_tft_write (was called spi_end)
** Description: End transaction for write and deselect TFT
***************************************************************************************/
void TFT_eeSPI::end_tft_write(void){
if(!inTransaction) { // Flag to stop ending transaction during multiple graphics calls
if (!locked) { // Locked when beginTransaction has been called
locked = true; // Flag to show SPI access now locked
SPI_BUSY_CHECK; // Check send complete and clean out unused rx data
CS_H;
SET_BUS_READ_MODE; // In case bus has been configured for tx only
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.endTransaction();
#endif
}
}
}
// Non-inlined version to permit override
inline void TFT_eeSPI::end_nin_write(void){
if(!inTransaction) { // Flag to stop ending transaction during multiple graphics calls
if (!locked) { // Locked when beginTransaction has been called
locked = true; // Flag to show SPI access now locked
SPI_BUSY_CHECK; // Check send complete and clean out unused rx data
CS_H;
SET_BUS_READ_MODE; // In case SPI has been configured for tx only
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.endTransaction();
#endif
}
}
}
/***************************************************************************************
** Function name: begin_tft_read (was called spi_begin_read)
** Description: Start transaction for reads and select TFT
***************************************************************************************/
// Reads require a lower SPI clock rate than writes
inline void TFT_eeSPI::begin_tft_read(void){
DMA_BUSY_CHECK; // Wait for any DMA transfer to complete before changing SPI settings
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
if (locked) {
locked = false;
spi.beginTransaction(SPISettings(SPI_READ_FREQUENCY, MSBFIRST, TFT_SPI_MODE));
CS_L;
}
#else
#if !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.setFrequency(SPI_READ_FREQUENCY);
#endif
CS_L;
#endif
SET_BUS_READ_MODE;
}
/***************************************************************************************
** Function name: end_tft_read (was called spi_end_read)
** Description: End transaction for reads and deselect TFT
***************************************************************************************/
inline void TFT_eeSPI::end_tft_read(void){
#if defined (SPI_HAS_TRANSACTION) && defined (SUPPORT_TRANSACTIONS) && !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
if(!inTransaction) {
if (!locked) {
locked = true;
CS_H;
spi.endTransaction();
}
}
#else
#if !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
spi.setFrequency(SPI_FREQUENCY);
#endif
if(!inTransaction) {CS_H;}
#endif
SET_BUS_WRITE_MODE;
}
/***************************************************************************************
** Function name: TFT_eeSPI
** Description: Constructor , we must use hardware SPI pins
***************************************************************************************/
TFT_eeSPI::TFT_eeSPI()
{
_booted = true; // Default attributes
rotation = 0;
locked = true; // Transaction mutex lock flag to ensure begin/endTranaction pairing
inTransaction = false; // Flag to prevent multiple sequential functions to keep bus access open
lockTransaction = false; // start/endWrite lock flag to allow sketch to keep SPI bus access open
#if defined (ESP32) && defined (CONFIG_SPIRAM_SUPPORT)
if (psramFound()) _psram_enable = true; // Enable the use of PSRAM (if available)
else
#endif
_psram_enable = false;
addr_row = 0xFFFF; // drawPixel command length optimiser
addr_col = 0xFFFF; // drawPixel command length optimiser
// Legacy support for bit GPIO masks
cspinmask = 0;
dcpinmask = 0;
wrpinmask = 0;
sclkpinmask = 0;
}
/***************************************************************************************
** Function name: initBus
** Description: initialise the SPI or parallel bus
***************************************************************************************/
void TFT_eeSPI::initBus(void) {
#ifdef TFT_CS
if (TFT_CS >= 0) {
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH); // Chip select high (inactive)
}
#endif
// Configure chip select for touchscreen controller if present
#ifdef TOUCH_CS
if (TOUCH_CS >= 0) {
pinMode(TOUCH_CS, OUTPUT);
digitalWrite(TOUCH_CS, HIGH); // Chip select high (inactive)
}
#endif
// In parallel mode and with the RP2040 processor, the TFT_WR line is handled in the PIO
#if defined (TFT_WR) && !defined (ARDUINO_ARCH_RP2040) && !defined (ARDUINO_ARCH_MBED)
if (TFT_WR >= 0) {
pinMode(TFT_WR, OUTPUT);
digitalWrite(TFT_WR, HIGH); // Set write strobe high (inactive)
}
#endif
#ifdef TFT_DC
if (TFT_DC >= 0) {
pinMode(TFT_DC, OUTPUT);
digitalWrite(TFT_DC, HIGH); // Data/Command high = data mode
}
#endif
#ifdef TFT_RST
if (TFT_RST >= 0) {
pinMode(TFT_RST, OUTPUT);
digitalWrite(TFT_RST, HIGH); // Set high, do not share pin with another SPI device
}
#endif
#if defined (TFT_PARALLEL_8_BIT)
// Make sure read is high before we set the bus to output
if (TFT_RD >= 0) {
pinMode(TFT_RD, OUTPUT);
digitalWrite(TFT_RD, HIGH);
}
#if !defined (ARDUINO_ARCH_RP2040) && !defined (ARDUINO_ARCH_MBED)// PIO manages pins
// Set TFT data bus lines to output
pinMode(TFT_D0, OUTPUT); digitalWrite(TFT_D0, HIGH);
pinMode(TFT_D1, OUTPUT); digitalWrite(TFT_D1, HIGH);
pinMode(TFT_D2, OUTPUT); digitalWrite(TFT_D2, HIGH);
pinMode(TFT_D3, OUTPUT); digitalWrite(TFT_D3, HIGH);
pinMode(TFT_D4, OUTPUT); digitalWrite(TFT_D4, HIGH);
pinMode(TFT_D5, OUTPUT); digitalWrite(TFT_D5, HIGH);
pinMode(TFT_D6, OUTPUT); digitalWrite(TFT_D6, HIGH);
pinMode(TFT_D7, OUTPUT); digitalWrite(TFT_D7, HIGH);
#endif
PARALLEL_INIT_TFT_DATA_BUS;
#endif
}
/***************************************************************************************
** Function name: begin
** Description: Included for backwards compatibility
***************************************************************************************/
void TFT_eeSPI::begin(uint8_t tc)
{
init(tc);
}
/***************************************************************************************
** Function name: init (tc is tab colour for ST7735 displays only)
** Description: Reset, then initialise the TFT display registers
***************************************************************************************/
void TFT_eeSPI::init(uint8_t tc)
{
if (_booted)
{
initBus();
#if !defined (ESP32) && !defined(TFT_PARALLEL_8_BIT) && !defined(ARDUINO_ARCH_RP2040) && !defined (ARDUINO_ARCH_MBED)
// Legacy bitmasks for GPIO
#if defined (TFT_CS) && (TFT_CS >= 0)
cspinmask = (uint32_t) digitalPinToBitMask(TFT_CS);
#endif
#if defined (TFT_DC) && (TFT_DC >= 0)
dcpinmask = (uint32_t) digitalPinToBitMask(TFT_DC);
#endif
#if defined (TFT_WR) && (TFT_WR >= 0)
wrpinmask = (uint32_t) digitalPinToBitMask(TFT_WR);
#endif
#if defined (TFT_SCLK) && (TFT_SCLK >= 0)
sclkpinmask = (uint32_t) digitalPinToBitMask(TFT_SCLK);
#endif
#if defined (TFT_SPI_OVERLAP) && defined (ARDUINO_ARCH_ESP8266)
// Overlap mode SD0=MISO, SD1=MOSI, CLK=SCLK must use D3 as CS
// pins(int8_t sck, int8_t miso, int8_t mosi, int8_t ss);
//spi.pins( 6, 7, 8, 0);
spi.pins(6, 7, 8, 0);
#endif
spi.begin(); // This will set HMISO to input
#else
#if !defined(TFT_PARALLEL_8_BIT) && !defined(RP2040_PIO_INTERFACE)
#if defined (TFT_MOSI) && !defined (TFT_SPI_OVERLAP) && !defined(ARDUINO_ARCH_RP2040) && !defined (ARDUINO_ARCH_MBED)
spi.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1); // This will set MISO to input
#else
spi.begin(); // This will set MISO to input
#endif
#endif
#endif
lockTransaction = false;
inTransaction = false;
locked = true;
INIT_TFT_DATA_BUS;
#if defined (TFT_CS) && !defined(RP2040_PIO_INTERFACE)
// Set to output once again in case MISO is used for CS
if (TFT_CS >= 0) {
pinMode(TFT_CS, OUTPUT);
digitalWrite(TFT_CS, HIGH); // Chip select high (inactive)
}
#elif defined (ARDUINO_ARCH_ESP8266) && !defined (TFT_PARALLEL_8_BIT) && !defined (RP2040_PIO_SPI)
spi.setHwCs(1); // Use hardware SS toggling
#endif
// Set to output once again in case MISO is used for DC
#if defined (TFT_DC) && !defined(RP2040_PIO_INTERFACE)
if (TFT_DC >= 0) {
pinMode(TFT_DC, OUTPUT);
digitalWrite(TFT_DC, HIGH); // Data/Command high = data mode
}
#endif
_booted = false;
end_tft_write();
} // end of: if just _booted
// Toggle RST low to reset
#ifdef TFT_RST
#if !defined(RP2040_PIO_INTERFACE)
// Set to output once again in case MISO is used for TFT_RST
if (TFT_RST >= 0) {
pinMode(TFT_RST, OUTPUT);
}
#endif
if (TFT_RST >= 0) {
writecommand(0x00); // Put SPI bus in known state for TFT with CS tied low
digitalWrite(TFT_RST, HIGH);
delay(5);
digitalWrite(TFT_RST, LOW);
delay(20);
digitalWrite(TFT_RST, HIGH);
}
else writecommand(TFT_SWRST); // Software reset
#else
writecommand(TFT_SWRST); // Software reset
#endif
delay(150); // Wait for reset to complete
begin_tft_write();
tc = tc; // Suppress warning
#include "drivers_init.hh"
#ifdef TFT_INVERSION_ON
writecommand(TFT_INVON);
#endif
#ifdef TFT_INVERSION_OFF
writecommand(TFT_INVOFF);
#endif
end_tft_write();
setRotation(rotation);
#if defined (TFT_BL) && defined (TFT_BACKLIGHT_ON)
if (TFT_BL >= 0) {
pinMode(TFT_BL, OUTPUT);
digitalWrite(TFT_BL, TFT_BACKLIGHT_ON);
}
#else
#if defined (TFT_BL) && defined (M5STACK)
// Turn on the back-light LED
if (TFT_BL >= 0) {
pinMode(TFT_BL, OUTPUT);
digitalWrite(TFT_BL, HIGH);
}
#endif
#endif
}
/***************************************************************************************
** Function name: setRotation
** Description: rotate the screen orientation m = 0-3 or 4-7 for BMP drawing
***************************************************************************************/
void TFT_eeSPI::setRotation(uint8_t m)
{
begin_tft_write();
#include "drivers_rotation.hh"
setRotationSizes(m);
delayMicroseconds(10);
end_tft_write();
addr_row = 0xFFFF;
addr_col = 0xFFFF;
// Reset the viewport to the whole screen
resetViewport();
}
/***************************************************************************************
** Function name: getRotation
** Description: Return the rotation value (as used by setRotation())
***************************************************************************************/
uint8_t TFT_eeSPI::getRotation(void)
{
return rotation;
}
/***************************************************************************************
** Function name: commandList, used for FLASH based lists only (e.g. ST7735)
** Description: Get initialisation commands from FLASH and send to TFT
***************************************************************************************/
void TFT_eeSPI::commandList (const uint8_t *addr)
{
uint8_t numCommands;
uint8_t numArgs;
uint8_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 & TFT_INIT_DELAY; // If high bit set, delay follows args
numArgs &= ~TFT_INIT_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)
delay( (ms==255 ? 500 : ms) );
}
}
}
/***************************************************************************************
** Function name: spiwrite
** Description: Write 8 bits to SPI port (legacy support only)
***************************************************************************************/
void TFT_eeSPI::spiwrite(uint8_t c)
{
begin_tft_write();
tft_Write_8(c);
end_tft_write();
}
/***************************************************************************************
** Function name: writecommand
** Description: Send an 8-bit command to the TFT
***************************************************************************************/
#ifndef RM68120_DRIVER
void TFT_eeSPI::writecommand(uint8_t c)
{
begin_tft_write();
DC_C;
tft_Write_8(c);
DC_D;
end_tft_write();
}
#else
void TFT_eeSPI::writecommand(uint16_t c)
{
begin_tft_write();
DC_C;
tft_Write_16(c);
DC_D;
end_tft_write();
}
void TFT_eeSPI::writeRegister8(uint16_t c, uint8_t d)
{
begin_tft_write();
DC_C;
tft_Write_16(c);
DC_D;
tft_Write_8(d);
end_tft_write();
}
void TFT_eSPI::writeRegister16(uint16_t c, uint16_t d)
{
begin_tft_write();
DC_C;
tft_Write_16(c);
DC_D;
tft_Write_16(d);
end_tft_write();
}
#endif
/***************************************************************************************
** Function name: writedata
** Description: Send a 8-bit data value to the TFT
***************************************************************************************/
void TFT_eeSPI::writedata(uint8_t d)
{
begin_tft_write();
DC_D; // Play safe, but should already be in data mode
tft_Write_8(d);
CS_L; // Allow more hold time for low VDI rail
end_tft_write();
}
/***************************************************************************************
** Function name: readcommand8
** Description: Read a 8-bit data value from an indexed command register
***************************************************************************************/
uint8_t TFT_eeSPI::readcommand8(uint8_t cmd_function, uint8_t index)
{
uint8_t reg = 0;
#if defined(TFT_PARALLEL_8_BIT) || defined(RP2040_PIO_INTERFACE)
writecommand(cmd_function); // Sets DC and CS high
busDir(GPIO_DIR_MASK, INPUT);
CS_L;
// Read nth parameter (assumes caller discards 1st parameter or points index to 2nd)
while(index--) reg = readByte();
busDir(GPIO_DIR_MASK, OUTPUT);
CS_H;
#else // SPI interface
// Tested with ILI9341 set to Interface II i.e. IM [3:0] = "1101"
begin_tft_read();
index = 0x10 + (index & 0x0F);
DC_C; tft_Write_8(0xD9);
DC_D; tft_Write_8(index);
CS_H; // Some displays seem to need CS to be pulsed here, or is just a delay needed?
CS_L;
DC_C; tft_Write_8(cmd_function);
DC_D;
reg = tft_Read_8();
end_tft_read();
#endif
return reg;
}
/***************************************************************************************
** Function name: readcommand16
** Description: Read a 16-bit data value from an indexed command register
***************************************************************************************/
uint16_t TFT_eeSPI::readcommand16(uint8_t cmd_function, uint8_t index)
{
uint32_t reg;
reg = (readcommand8(cmd_function, index + 0) << 8);
reg |= (readcommand8(cmd_function, index + 1) << 0);
return reg;
}
/***************************************************************************************
** Function name: readcommand32
** Description: Read a 32-bit data value from an indexed command register
***************************************************************************************/
uint32_t TFT_eeSPI::readcommand32(uint8_t cmd_function, uint8_t index)
{
uint32_t reg;
reg = ((uint32_t)readcommand8(cmd_function, index + 0) << 24);
reg |= ((uint32_t)readcommand8(cmd_function, index + 1) << 16);
reg |= ((uint32_t)readcommand8(cmd_function, index + 2) << 8);
reg |= ((uint32_t)readcommand8(cmd_function, index + 3) << 0);
return reg;
}
/***************************************************************************************
** Function name: read pixel (for SPI Interface II i.e. IM [3:0] = "1101")
** Description: Read 565 pixel colours from a pixel
***************************************************************************************/
uint16_t TFT_eeSPI::readPixel(clip_t& clip, int32_t x, int32_t y)
{
if (!clip.check_point(x, y)) return 0;
#if defined(TFT_PARALLEL_8_BIT) || defined(RP2040_PIO_INTERFACE)
if (!inTransaction) { CS_L; } // CS_L can be multi-statement
readAddrWindow(x, y, 1, 1);
// Set masked pins D0- D7 to input
busDir(GPIO_DIR_MASK, INPUT);
#if !defined (SSD1963_DRIVER)
// Dummy read to throw away don't care value
readByte();
#endif
// Fetch the 16-bit BRG pixel
//uint16_t rgb = (readByte() << 8) | readByte();
#if defined (ILI9341_DRIVER) || defined(ILI9341_2_DRIVER) || defined (ILI9488_DRIVER) || defined (SSD1963_DRIVER)// Read 3 bytes
// Read window pixel 24-bit RGB values and fill in LS bits
uint16_t rgb = ((readByte() & 0xF8) << 8) | ((readByte() & 0xFC) << 3) | (readByte() >> 3);
if (!inTransaction) { CS_H; } // CS_H can be multi-statement
// Set masked pins D0- D7 to output
busDir(GPIO_DIR_MASK, OUTPUT);
return rgb;
#else // ILI9481 or ILI9486 16-bit read
// Fetch the 16-bit BRG pixel
uint16_t bgr = (readByte() << 8) | readByte();
if (!inTransaction) { CS_H; } // CS_H can be multi-statement
// Set masked pins D0- D7 to output
busDir(GPIO_DIR_MASK, OUTPUT);
#if defined (ILI9486_DRIVER) || defined (ST7796_DRIVER)
return bgr;
#else
// Swap Red and Blue (could check MADCTL setting to see if this is needed)
return (bgr>>11) | (bgr<<11) | (bgr & 0x7E0);
#endif
#endif
#else // Not TFT_PARALLEL_8_BIT
// This function can get called during anti-aliased font rendering
// so a transaction may be in progress
bool wasInTransaction = inTransaction;
if (inTransaction) { inTransaction= false; end_tft_write();}
uint16_t color = 0;
begin_tft_read(); // Sets CS low
readAddrWindow(x, y, 1, 1);
#ifdef TFT_SDA_READ
begin_SDA_Read();
#endif
// Dummy read to throw away don't care value
tft_Read_8();
//#if !defined (ILI9488_DRIVER)
#if defined (ST7796_DRIVER)
// Read the 2 bytes
color = ((tft_Read_8()) << 8) | (tft_Read_8());
#elif defined (ST7735_DRIVER)
// Read the 3 RGB bytes, colour is in LS 6 bits of the top 7 bits of each byte
// as the TFT stores colours as 18 bits
uint8_t r = tft_Read_8()<<1;
uint8_t g = tft_Read_8()<<1;
uint8_t b = tft_Read_8()<<1;
color = color565(r, g, b);
#else
// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
// as the TFT stores colours as 18 bits
uint8_t r = tft_Read_8();
uint8_t g = tft_Read_8();
uint8_t b = tft_Read_8();
color = color565(r, g, b);
#endif
/*
#else
// The 6 colour bits are in MS 6 bits of each byte, but the ILI9488 needs an extra clock pulse
// so bits appear shifted right 1 bit, so mask the middle 6 bits then shift 1 place left
uint8_t r = (tft_Read_8()&0x7E)<<1;
uint8_t g = (tft_Read_8()&0x7E)<<1;
uint8_t b = (tft_Read_8()&0x7E)<<1;
color = color565(r, g, b);
#endif
*/
CS_H;
#ifdef TFT_SDA_READ
end_SDA_Read();
#endif
end_tft_read();
// Reinstate the transaction if one was in progress
if(wasInTransaction) { begin_tft_write(); inTransaction = true; }
return color;
#endif
}
/***************************************************************************************
** Function name: read rectangle (for SPI Interface II i.e. IM [3:0] = "1101")
** Description: Read 565 pixel colours from a defined area
***************************************************************************************/
void TFT_eeSPI::readRect(clip_t& clip, int32_t x0, int32_t y0, int32_t w, int32_t h, uint16_t *data)
{
block_t z;
if (!clip.check_block(z, x0, y0, w, h)) return;
#if defined(TFT_PARALLEL_8_BIT) || defined(RP2040_PIO_INTERFACE)
CS_L;
readAddrWindow(z.x, z.y, z.dw, z.dh);
data += z.dx + z.dy * w;
// Set masked pins D0- D7 to input
busDir(GPIO_DIR_MASK, INPUT);
#if defined (ILI9341_DRIVER) || defined(ILI9341_2_DRIVER) || defined (ILI9488_DRIVER) // Read 3 bytes
// Dummy read to throw away don't care value
readByte();
// Fetch the 24-bit RGB value
while (z.dh--) {
int32_t lw = z.dw;
uint16_t* line = data;
while (lw--) {
// Assemble the RGB 16-bit colour
uint16_t rgb = ((readByte() & 0xF8) << 8) | ((readByte() & 0xFC) << 3) | (readByte() >> 3);
// Swapped byte order for compatibility with pushRect()
*line++ = (rgb<<8) | (rgb>>8);
}
data += w;
}
#elif defined (SSD1963_DRIVER)
// Fetch the 18-bit BRG pixels
while (z.dh--) {
int32_t lw = z.dw;
uint16_t* line = data;
while (lw--) {
uint16_t bgr = ((readByte() & 0xF8) >> 3);; // CS_L adds a small delay
bgr |= ((readByte() & 0xFC) << 3);
bgr |= (readByte() << 8);
// Swap Red and Blue (could check MADCTL setting to see if this is needed)
uint16_t rgb = (bgr>>11) | (bgr<<11) | (bgr & 0x7E0);
// Swapped byte order for compatibility with pushRect()
*line++ = (rgb<<8) | (rgb>>8);
}
data += w;
}
#else // ILI9481 reads as 16 bits
// Dummy read to throw away don't care value
readByte();
// Fetch the 16-bit BRG pixels
while (z.dh--) {
int32_t lw = z.dw;
uint16_t* line = data;
while (lw--) {
#if defined (ILI9486_DRIVER) || defined (ST7796_DRIVER)
// Read the RGB 16-bit colour
*line++ = readByte() | (readByte() << 8);
#else
// Read the BRG 16-bit colour
uint16_t bgr = (readByte() << 8) | readByte();
// Swap Red and Blue (could check MADCTL setting to see if this is needed)
uint16_t rgb = (bgr>>11) | (bgr<<11) | (bgr & 0x7E0);
// Swapped byte order for compatibility with pushRect()
*line++ = (rgb<<8) | (rgb>>8);
#endif
}
data += w;
}
#endif
CS_H;
// Set masked pins D0- D7 to output
busDir(GPIO_DIR_MASK, OUTPUT);
#else // SPI interface
// This function can get called after a begin_tft_write
// so a transaction may be in progress
bool wasInTransaction = inTransaction;
if (inTransaction) { inTransaction= false; end_tft_write();}
uint16_t color = 0;
begin_tft_read();
readAddrWindow(z.x, z.y, z.dw, z.dh);
data += z.dx + z.dy * w;
#ifdef TFT_SDA_READ
begin_SDA_Read();
#endif
// Dummy read to throw away don't care value
tft_Read_8();
// Read window pixel 24-bit RGB values
while (z.dh--) {
int32_t lw = z.dw;
uint16_t* line = data;
while (lw--) {
#if !defined (ILI9488_DRIVER)
#if defined (ST7796_DRIVER)
// Read the 2 bytes
color = ((tft_Read_8()) << 8) | (tft_Read_8());
#elif defined (ST7735_DRIVER)
// Read the 3 RGB bytes, colour is in LS 6 bits of the top 7 bits of each byte
// as the TFT stores colours as 18 bits
uint8_t r = tft_Read_8()<<1;
uint8_t g = tft_Read_8()<<1;
uint8_t b = tft_Read_8()<<1;
color = color565(r, g, b);
#else
// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
// as the TFT stores colours as 18 bits
uint8_t r = tft_Read_8();
uint8_t g = tft_Read_8();
uint8_t b = tft_Read_8();
color = color565(r, g, b);
#endif
#else
// The 6 colour bits are in MS 6 bits of each byte but we do not include the extra clock pulse
// so we use a trick and mask the middle 6 bits of the byte, then only shift 1 place left
uint8_t r = (tft_Read_8()&0x7E)<<1;
uint8_t g = (tft_Read_8()&0x7E)<<1;
uint8_t b = (tft_Read_8()&0x7E)<<1;
color = color565(r, g, b);
#endif
// Swapped colour byte order for compatibility with pushRect()
*line++ = color << 8 | color >> 8;
}
data += w;
}
//CS_H;
#ifdef TFT_SDA_READ
end_SDA_Read();
#endif
end_tft_read();
// Reinstate the transaction if one was in progress
if(wasInTransaction) { begin_tft_write(); inTransaction = true; }
#endif
}
/***************************************************************************************
** Function name: read rectangle (for SPI Interface II i.e. IM [3:0] = "1101")
** Description: Read RGB pixel colours from a defined area
***************************************************************************************/
// If w and h are 1, then 1 pixel is read, *data array size must be 3 bytes per pixel
void TFT_eeSPI::readRectRGB(clip_t& clip, int32_t x0, int32_t y0, int32_t w, int32_t h, uint8_t *data)
{
#if defined(TFT_PARALLEL_8_BIT) || defined(RP2040_PIO_INTERFACE)
uint32_t len = w * h;
uint8_t* buf565 = data + len;
readRect(clip, x0, y0, w, h, (uint16_t*)buf565);
while (len--) {
uint16_t pixel565 = (*buf565++)<<8;
pixel565 |= *buf565++;
uint8_t red = (pixel565 & 0xF800) >> 8; red |= red >> 5;
uint8_t green = (pixel565 & 0x07E0) >> 3; green |= green >> 6;
uint8_t blue = (pixel565 & 0x001F) << 3; blue |= blue >> 5;
*data++ = red;
*data++ = green;
*data++ = blue;
}
#else // Not TFT_PARALLEL_8_BIT
begin_tft_read();
readAddrWindow(x0, y0, w, h); // Sets CS low
#ifdef TFT_SDA_READ
begin_SDA_Read();
#endif
// Dummy read to throw away don't care value
tft_Read_8();
// Read window pixel 24-bit RGB values, buffer must be set in sketch to 3 * w * h
uint32_t len = w * h;
while (len--) {
#if !defined (ILI9488_DRIVER)
// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
// as the TFT stores colours as 18 bits
*data++ = tft_Read_8();
*data++ = tft_Read_8();
*data++ = tft_Read_8();
#else
// The 6 colour bits are in MS 6 bits of each byte, but the ILI9488 needs an extra clock pulse
// so bits appear shifted right 1 bit, so mask the middle 6 bits then shift 1 place left
*data++ = (tft_Read_8()&0x7E)<<1;
*data++ = (tft_Read_8()&0x7E)<<1;
*data++ = (tft_Read_8()&0x7E)<<1;
#endif
}
CS_H;
#ifdef TFT_SDA_READ
end_SDA_Read();