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- #include <Adafruit_GFX.h> // Core graphics library
- #include "Adafruit_ILI9341.h" // Hardware-specific library
- #include <SPI.h>
- #include <SD.h>
- // Pins
- #define TFT_DC 9
- #define TFT_CS 4
- #define TFT_RST 8
- // Rotation
- #define TFT_ROTATION 2 // 180 deg
- Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
- #define SD_CS 5
- void setup(void) {
- Serial.begin(9600);
- tft.begin();
- tft.setRotation(TFT_ROTATION);
- tft.fillScreen(ILI9341_BLUE);
- Serial.print("Initializing SD card...");
- if (!SD.begin(SD_CS)) {
- Serial.println("failed!");
- }
- Serial.println("OK!");
- bmpDraw("08.bmp", 0, 0);
- }
- void loop() {
- }
- // This function opens a Windows Bitmap (BMP) file and
- // displays it at the given coordinates. It's sped up
- // by reading many pixels worth of data at a time
- // (rather than pixel by pixel). Increasing the buffer
- // size takes more of the Arduino's precious RAM but
- // makes loading a little faster. 20 pixels seems a
- // good balance.
- #define BUFFPIXEL 20
- void bmpDraw(char *filename, uint8_t x, uint16_t y) {
- File bmpFile;
- int bmpWidth, bmpHeight; // W+H in pixels
- uint8_t bmpDepth; // Bit depth (currently must be 24)
- uint32_t bmpImageoffset; // Start of image data in file
- uint32_t rowSize; // Not always = bmpWidth; may have padding
- uint8_t sdbuffer[3*BUFFPIXEL]; // pixel buffer (R+G+B per pixel)
- uint8_t buffidx = sizeof(sdbuffer); // Current position in sdbuffer
- boolean goodBmp = false; // Set to true on valid header parse
- boolean flip = true; // BMP is stored bottom-to-top
- int w, h, row, col;
- uint8_t r, g, b;
- uint32_t pos = 0, startTime = millis();
- if((x >= tft.width()) || (y >= tft.height())) return;
- Serial.println();
- Serial.print(F("Loading image '"));
- Serial.print(filename);
- Serial.println('\'');
- // Open requested file on SD card
- if ((bmpFile = SD.open(filename)) == NULL) {
- Serial.print(F("File not found"));
- return;
- }
- // Parse BMP header
- if(read16(bmpFile) == 0x4D42) { // BMP signature
- Serial.print(F("File size: ")); Serial.println(read32(bmpFile));
- (void)read32(bmpFile); // Read & ignore creator bytes
- bmpImageoffset = read32(bmpFile); // Start of image data
- Serial.print(F("Image Offset: ")); Serial.println(bmpImageoffset, DEC);
- // Read DIB header
- Serial.print(F("Header size: ")); Serial.println(read32(bmpFile));
- bmpWidth = read32(bmpFile);
- bmpHeight = read32(bmpFile);
- if(read16(bmpFile) == 1) { // # planes -- must be '1'
- bmpDepth = read16(bmpFile); // bits per pixel
- Serial.print(F("Bit Depth: ")); Serial.println(bmpDepth);
- if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
- goodBmp = true; // Supported BMP format -- proceed!
- Serial.print(F("Image size: "));
- Serial.print(bmpWidth);
- Serial.print('x');
- Serial.println(bmpHeight);
- // BMP rows are padded (if needed) to 4-byte boundary
- rowSize = (bmpWidth * 3 + 3) & ~3;
- // If bmpHeight is negative, image is in top-down order.
- // This is not canon but has been observed in the wild.
- if(bmpHeight < 0) {
- bmpHeight = -bmpHeight;
- flip = false;
- }
- // Crop area to be loaded
- w = bmpWidth;
- h = bmpHeight;
- if((x+w-1) >= tft.width()) w = tft.width() - x;
- if((y+h-1) >= tft.height()) h = tft.height() - y;
- // Set TFT address window to clipped image bounds
- tft.setAddrWindow(x, y, x+w-1, y+h-1);
- for (row=0; row<h; row++) { // For each scanline...
- // Seek to start of scan line. It might seem labor-
- // intensive to be doing this on every line, but this
- // method covers a lot of gritty details like cropping
- // and scanline padding. Also, the seek only takes
- // place if the file position actually needs to change
- // (avoids a lot of cluster math in SD library).
- if(flip) // Bitmap is stored bottom-to-top order (normal BMP)
- pos = bmpImageoffset + (bmpHeight - 1 - row) * rowSize;
- else // Bitmap is stored top-to-bottom
- pos = bmpImageoffset + row * rowSize;
- if(bmpFile.position() != pos) { // Need seek?
- bmpFile.seek(pos);
- buffidx = sizeof(sdbuffer); // Force buffer reload
- }
- for (col=0; col<w; col++) { // For each pixel...
- // Time to read more pixel data?
- if (buffidx >= sizeof(sdbuffer)) { // Indeed
- bmpFile.read(sdbuffer, sizeof(sdbuffer));
- buffidx = 0; // Set index to beginning
- }
- // Convert pixel from BMP to TFT format, push to display
- b = sdbuffer[buffidx++];
- g = sdbuffer[buffidx++];
- r = sdbuffer[buffidx++];
- tft.pushColor(tft.color565(r,g,b));
- } // end pixel
- } // end scanline
- Serial.print(F("Loaded in "));
- Serial.print(millis() - startTime);
- Serial.println(" ms");
- } // end goodBmp
- }
- }
- bmpFile.close();
- if(!goodBmp) Serial.println(F("BMP format not recognized."));
- }
- // These read 16- and 32-bit types from the SD card file.
- // BMP data is stored little-endian, Arduino is little-endian too.
- // May need to reverse subscript order if porting elsewhere.
- uint16_t read16(File &f) {
- uint16_t result;
- ((uint8_t *)&result)[0] = f.read(); // LSB
- ((uint8_t *)&result)[1] = f.read(); // MSB
- return result;
- }
- uint32_t read32(File &f) {
- uint32_t result;
- ((uint8_t *)&result)[0] = f.read(); // LSB
- ((uint8_t *)&result)[1] = f.read();
- ((uint8_t *)&result)[2] = f.read();
- ((uint8_t *)&result)[3] = f.read(); // MSB
- return result;
- }
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