Add capability to read TFT SDA bi-directional pin
Tested on an ESP32 with ST7789V display SDA read is very slow on an ESP8266 (to be investigated) Added new setup #define TFT_SDA_READ Add new ESP32 and ESP8266 compatible in example/Generic folder to test capture of TFT screen
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@@ -253,6 +253,10 @@ void TFT_eSPI::init(uint8_t tc)
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wrpinmask = (uint32_t) digitalPinToBitMask(TFT_WR);
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#endif
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#ifdef TFT_SCLK
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sclkpinmask = (uint32_t) digitalPinToBitMask(TFT_SCLK);
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#endif
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#ifdef TFT_SPI_OVERLAP
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// Overlap mode SD0=MISO, SD1=MOSI, CLK=SCLK must use D3 as CS
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// pins(int8_t sck, int8_t miso, int8_t mosi, int8_t ss);
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@@ -620,35 +624,68 @@ uint16_t TFT_eSPI::readPixel(int32_t x0, int32_t y0)
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spi_begin_read();
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD); // Switch from 16 bit colour to 18 bit (required)
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writedata(0x66);
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#endif
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readAddrWindow(x0, y0, x0, y0); // Sets CS low
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#ifdef TFT_SDA_READ
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// To be investigated: spi_end_read() is VERY slow on the ESP8266 here
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spi_end_read(); // Releasing the HAL mutex is mandatory for the ESP32
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SPI.end(); // Disconnect the SPI peripheral to release the pins
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digitalWrite(TFT_SCLK, HIGH); // Set clock pin high
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pinMode(TFT_SCLK, OUTPUT); // Set the SCLK pin to output
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pinMode(TFT_MOSI, INPUT_PULLUP); // Set the MOSI pin to input
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#endif
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// Dummy read to throw away don't care value
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tft_Write_8(0);
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tft_Read_8(0);
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// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
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// as the TFT stores colours as 18 bits
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#if !defined (ILI9488_DRIVER)
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uint8_t r = tft_Read_8(0);
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uint8_t g = tft_Read_8(0);
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uint8_t b = tft_Read_8(0);
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#else
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// The 6 colour bits are in MS 6 bits of each byte, but the ILI9488 needs an extra clock pulse
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// so bits appear shifted right 1 bit, so mask the middle 6 bits then shift 1 place left
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uint8_t r = (tft_Read_8(0)&0x7E)<<1;
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uint8_t g = (tft_Read_8(0)&0x7E)<<1;
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uint8_t b = (tft_Read_8(0)&0x7E)<<1;
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#endif
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CS_H;
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#ifdef TFT_SDA_READ
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#ifdef ESP32
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SPI.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1);
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#else
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#ifdef TFT_SPI_OVERLAP
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SPI.pins(6, 7, 8, 0);
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#else
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SPI.begin();
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#endif
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#endif
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD);
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writedata(0x55);
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#endif
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#else
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spi_end_read();
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#endif
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return color565(r, g, b);
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#endif
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}
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/***************************************************************************************
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** Function name: read byte - supports class functions
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** Description: Read a byte from ESP32 8 bit data port
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@@ -756,10 +793,24 @@ void TFT_eSPI::readRect(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint16_t
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spi_begin_read();
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD); // Switch from 16 bit colour to 18 bit (required)
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writedata(0x66);
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#endif
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readAddrWindow(x, y, x + w - 1, y + h - 1); // Sets CS low
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#ifdef TFT_SDA_READ
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// To be investigated: spi_end_read() is VERY slow on the ESP8266 here
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spi_end_read(); // Releasing the HAL mutex is mandatory for the ESP32
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SPI.end(); // Disconnect the SPI peripheral to release the pins
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digitalWrite(TFT_SCLK, HIGH); // Set clock pin high
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pinMode(TFT_SCLK, OUTPUT); // Set the SCLK pin to output
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pinMode(TFT_MOSI, INPUT_PULLUP); // Set the MOSI pin to input
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#endif
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// Dummy read to throw away don't care value
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tft_Write_8(0);
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tft_Read_8(0);
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// Read window pixel 24 bit RGB values
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uint32_t len = w * h;
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@@ -768,15 +819,19 @@ void TFT_eSPI::readRect(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint16_t
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// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
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// as the TFT stores colours as 18 bits
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#if !defined (ILI9488_DRIVER)
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uint8_t r = tft_Read_8(0);
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uint8_t g = tft_Read_8(0);
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uint8_t b = tft_Read_8(0);
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#else
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// The 6 colour bits are in LS 6 bits of each byte but we do not include the extra clock pulse
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// so we use a trick and mask the middle 6 bits of the byte, then only shift 1 place left
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uint8_t r = (tft_Read_8(0)&0x7E)<<1;
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uint8_t g = (tft_Read_8(0)&0x7E)<<1;
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uint8_t b = (tft_Read_8(0)&0x7E)<<1;
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#endif
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// Swapped colour byte order for compatibility with pushRect()
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@@ -785,10 +840,64 @@ void TFT_eSPI::readRect(uint32_t x, uint32_t y, uint32_t w, uint32_t h, uint16_t
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CS_H;
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#ifdef TFT_SDA_READ
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#ifdef ESP32
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SPI.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1);
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#else
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#ifdef TFT_SPI_OVERLAP
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SPI.pins(6, 7, 8, 0);
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#else
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SPI.begin();
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#endif
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#endif
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD);
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writedata(0x55);
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#endif
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#else
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spi_end_read();
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#endif
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#endif
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}
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/***************************************************************************************
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** Function name: tft_Read_8
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** Description: Software SPI to read bidirectional SDA line
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***************************************************************************************/
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// For the ST7789 the tft_Read_8() macro is replaced by a function
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#ifdef TFT_SDA_READ
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#ifdef ESP32
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#define SCLK_L GPIO.out_w1tc = (1 << TFT_SCLK)
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#define SCLK_H GPIO.out_w1ts = (1 << TFT_SCLK)
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#else // ESP8266
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#define SCLK_L GPOC=sclkpinmask
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#define SCLK_H GPOS=sclkpinmask
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#endif
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uint8_t TFT_eSPI::tft_Read_8(uint8_t dummy)
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{
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uint8_t ret = 0;
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uint32_t reg = 0;
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for (uint8_t i = 0; i < 8; i++) { // read results
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ret <<= 1;
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#ifdef ESP32 // bit bangs at around 1MHz
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SCLK_L;
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//SCLK_L;
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reg = gpio_input_get(); // SDA must connect to ESP32 pin in range 0-31
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SCLK_H;
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if (reg&(1<<TFT_MOSI)) ret |= 1;
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SCLK_H; // Extra delay - must read slowly on an ST7789 to avoid bad data
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#else
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SCLK_L;
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if (digitalRead(TFT_MOSI)) ret |= 1;
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SCLK_H;
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#endif
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}
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return ret;
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}
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#endif
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/***************************************************************************************
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** Function name: push rectangle (for SPI Interface II i.e. IM [3:0] = "1101")
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@@ -1337,39 +1446,78 @@ bool TFT_eSPI::getSwapBytes(void)
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// If w and h are 1, then 1 pixel is read, *data array size must be 3 bytes per pixel
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void TFT_eSPI::readRectRGB(int32_t x0, int32_t y0, int32_t w, int32_t h, uint8_t *data)
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{
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#if !defined(ESP32_PARALLEL)
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#if defined(ESP32_PARALLEL)
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// ESP32 parallel bus supported yet
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#else // Not ESP32_PARALLEL
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spi_begin_read();
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD); // Switch from 16 bit colour to 18 bit (required)
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writedata(0x66);
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#endif
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readAddrWindow(x0, y0, x0 + w - 1, y0 + h - 1); // Sets CS low
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#ifdef TFT_SDA_READ
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// To be investigated: spi_end_read() is VERY slow on the ESP8266 here
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spi_end_read(); // Releasing the HAL mutex is mandatory for the ESP32
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SPI.end(); // Disconnect the SPI peripheral to release the pins
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digitalWrite(TFT_SCLK, HIGH); // Set clock pin high
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pinMode(TFT_SCLK, OUTPUT); // Set the SCLK pin to output
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pinMode(TFT_MOSI, INPUT_PULLUP); // Set the MOSI pin to input
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#endif
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// Dummy read to throw away don't care value
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tft_Write_8(0);
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tft_Read_8(0);
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// Read window pixel 24 bit RGB values, buffer must be set in sketch to 3 * w * h
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uint32_t len = w * h;
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while (len--) {
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// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
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// as the TFT stores colours as 18 bits
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// Read the 3 RGB bytes, colour is actually only in the top 6 bits of each byte
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// as the TFT stores colours as 18 bits
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#if !defined (ILI9488_DRIVER)
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*data++ = tft_Read_8(0);
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*data++ = tft_Read_8(0);
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*data++ = tft_Read_8(0);
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#else
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// The 6 colour bits are in MS 6 bits of each byte, but the ILI9488 needs an extra clock pulse
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// so bits appear shifted right 1 bit, so mask the middle 6 bits then shift 1 place left
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*data++ = (tft_Read_8(0)&0x7E)<<1;
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*data++ = (tft_Read_8(0)&0x7E)<<1;
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*data++ = (tft_Read_8(0)&0x7E)<<1;
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#endif
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}
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CS_H;
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#ifdef TFT_SDA_READ
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#ifdef ESP32
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SPI.begin(TFT_SCLK, TFT_MISO, TFT_MOSI, -1);
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#else
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#ifdef TFT_SPI_OVERLAP
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SPI.pins(6, 7, 8, 0);
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#else
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SPI.begin();
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#endif
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#endif
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#ifdef ST7789_DRIVER
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writecommand(ST7789_COLMOD);
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writedata(0x55);
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#endif
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#else
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spi_end_read();
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#endif
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#endif
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}
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