Using an LCD on the Edison
Contributors:
Shawn Hymel
Example Program: C++
If you are used to writing C/C++, then this is the way to go. Go back to your home directory and create a C++ file:
cd ~ vi ili9341.cpp
Press 'i' to type text. Copy and paste the code below into vi (if you are using an SSH client like PuTTY, simply right-click in the window to paste).
int main(int argc, char **argv) { // Pins (Edison) // CS_LCD GP44 (MRAA 31) // CS_SD GP43 (MRAA 38) unused // DC GP12 (MRAA 20) // RESEST GP13 (MRAA 14) upm::ILI9341 * lcd = new upm::ILI9341(31, 38, 20, 14); // Fill the screen with a solid color lcd->fillScreen(lcd->color565(0, 40, 16)); // Draw some shapes lcd->drawFastVLine(10, 10, 100, ILI9341_RED); lcd->drawFastHLine(20, 10, 50, ILI9341_CYAN); lcd->drawLine(160, 30, 200, 60, ILI9341_GREEN); lcd->fillRect(20, 30, 75, 60, ILI9341_ORANGE); lcd->drawCircle(70, 50, 20, ILI9341_PURPLE); lcd->fillCircle(120, 50, 20, ILI9341_PURPLE); lcd->drawTriangle(50, 100, 10, 140, 90, 140, ILI9341_YELLOW); lcd->fillTriangle(150, 100, 110, 140, 190, 140, ILI9341_YELLOW); lcd->drawRoundRect(20, 150, 50, 30, 10, ILI9341_RED); lcd->drawRoundRect(130, 150, 50, 30, 10, ILI9341_RED); lcd->fillRoundRect(75, 150, 50, 30, 10, ILI9341_RED); // Write some text lcd->setCursor(0, 200); lcd->setTextColor(ILI9341_LIGHTGREY); lcd->setTextWrap(true); lcd->setTextSize(1); lcd->print("Text 1\n"); lcd->setTextSize(2); lcd->print("Text 2\n"); lcd->setTextSize(3); lcd->print("Text 3\n"); lcd->setTextSize(4); lcd->print("Text 4\n"); // Test screen rotation for(int r = 0; r < 4; r++) { lcd->setRotation(r); lcd->fillRect(0, 0, 5, 5, ILI9341_WHITE); sleep(1); } // Invert colors, wait, then revert back lcd->invertDisplay(true); sleep(2); lcd->invertDisplay(false); // Don't forget to free up that memory! delete lcd; return 0; }
Save and exit ('esc', type ':wq', and press 'enter'). Append the UPM modules location to our linker PATH, and compile the program:
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib g++ ili9341.cpp -o ili9341 -lupm-ili9341 -lmraa -I/usr/local/include/upm
Run the program:
./ili9341
The screen will fill with a color and draw some basic shapes!