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Extend the pixelRead() function to allow reading of pixels from ILI9341. #53

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Extend the pixelRead() function to allow reading of pixels from ILI9341. #53

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21 changes: 19 additions & 2 deletions Adafruit_TFTLCD.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1000,8 +1000,25 @@ uint16_t Adafruit_TFTLCD::readPixel(int16_t x, int16_t y) {
CS_IDLE;
return (((uint16_t)r & B11111000) << 8) | (((uint16_t)g & B11111100) << 3) |
(b >> 3);
} else
return 0;
} else if(driver == ID_9341) {
uint8_t r, g, b;
setAddrWindow(x, y, width()-1, height()-1);
CS_ACTIVE;
CD_COMMAND;
write8(ILI9341_MEMORYREAD);
setReadDir();
CD_DATA;
delayMicroseconds(50);
read8(r);
read8(r);
read8(g);
read8(b);
setWriteDir();
CS_IDLE;
return (((uint16_t)r & B11111000) << 8) | (((uint16_t)g & B11111100) << 3) |
(b >> 3);

} else return 0;
}

// Ditto with the read/write port directions, as above.
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1 change: 1 addition & 0 deletions registers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,7 @@
#define ILI9341_COLADDRSET 0x2A
#define ILI9341_PAGEADDRSET 0x2B
#define ILI9341_MEMORYWRITE 0x2C
#define ILI9341_MEMORYREAD 0x2E
#define ILI9341_PIXELFORMAT 0x3A
#define ILI9341_FRAMECONTROL 0xB1
#define ILI9341_DISPLAYFUNC 0xB6
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