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ladyadaladyada
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touch/sd image demo
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‎examples/fulltest_featherwing/fulltest_featherwing.ino

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/***************************************************
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This is our touchscreen painting example for the Adafruit TFT FeatherWing
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----> http://www.adafruit.com/products/3315
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Check out the links above for our tutorials and wiring diagrams
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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Written by Limor Fried/Ladyada for Adafruit Industries.
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MIT license, all text above must be included in any redistribution
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****************************************************/
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#include <SPI.h>
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#include <Wire.h> // this is needed even tho we aren't using it
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#include <Adafruit_GFX.h> // Core graphics library
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#include <Adafruit_ILI9341.h> // Hardware-specific library
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#include <SD.h>
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#include <Adafruit_STMPE610.h>
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#ifdef ESP8266
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#define STMPE_CS 16
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#define TFT_CS 0
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#define TFT_DC 15
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#define SD_CS 2
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#endif
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#ifdef __AVR_ATmega32U4__
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#define STMPE_CS 6
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#define TFT_CS 9
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#define TFT_DC 10
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#define SD_CS 5
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#endif
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#ifdef ARDUINO_SAMD_FEATHER_M0
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#define STMPE_CS 6
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#define TFT_CS 9
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#define TFT_DC 10
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#define SD_CS 5
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#endif
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#ifdef TEENSYDUINO
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#define TFT_DC 10
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#define TFT_CS 4
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#define STMPE_CS 3
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#define SD_CS 8
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#endif
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#ifdef ARDUINO_STM32_FEATHER
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#define TFT_DC PB4
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#define TFT_CS PA15
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#define STMPE_CS PC7
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#define SD_CS PC5
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#endif
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Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
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Adafruit_STMPE610 ts = Adafruit_STMPE610(STMPE_CS);
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// This is calibration data for the raw touch data to the screen coordinates
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#define TS_MINX 3800
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#define TS_MAXX 100
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#define TS_MINY 100
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#define TS_MAXY 3750
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#define PENRADIUS 3
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void setup(void) {
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Serial.begin(115200);
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delay(10);
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Serial.println("FeatherWing TFT");
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if (!ts.begin()) {
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Serial.println("Couldn't start touchscreen controller");
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while (1);
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}
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Serial.println("Touchscreen started");
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tft.begin();
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tft.fillScreen(ILI9341_BLUE);
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yield();
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Serial.print("Initializing SD card...");
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if (!SD.begin(SD_CS)) {
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Serial.println("failed!");
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}
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Serial.println("OK!");
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bmpDraw("purple.bmp", 0, 0);
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}
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void loop() {
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// Retrieve a point
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TS_Point p = ts.getPoint();
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Serial.print("X = "); Serial.print(p.x);
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Serial.print("\tY = "); Serial.print(p.y);
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Serial.print("\tPressure = "); Serial.println(p.z);
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// Scale from ~0->4000 to tft.width using the calibration #'s
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p.x = map(p.x, TS_MINX, TS_MAXX, 0, tft.width());
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p.y = map(p.y, TS_MINY, TS_MAXY, 0, tft.height());
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if (((p.y-PENRADIUS) > 0) && ((p.y+PENRADIUS) < tft.height())) {
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tft.fillCircle(p.x, p.y, PENRADIUS, ILI9341_RED);
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}
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}
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// This function opens a Windows Bitmap (BMP) file and
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// displays it at the given coordinates. It's sped up
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// by reading many pixels worth of data at a time
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// (rather than pixel by pixel). Increasing the buffer
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// size takes more of the Arduino's precious RAM but
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// makes loading a little faster. 20 pixels seems a
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// good balance.
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#define BUFFPIXEL 20
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void bmpDraw(char *filename, uint8_t x, uint16_t y) {
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File bmpFile;
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int bmpWidth, bmpHeight; // W+H in pixels
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uint8_t bmpDepth; // Bit depth (currently must be 24)
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uint32_t bmpImageoffset; // Start of image data in file
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uint32_t rowSize; // Not always = bmpWidth; may have padding
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uint8_t sdbuffer[3*BUFFPIXEL]; // pixel buffer (R+G+B per pixel)
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uint8_t buffidx = sizeof(sdbuffer); // Current position in sdbuffer
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boolean goodBmp = false; // Set to true on valid header parse
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boolean flip = true; // BMP is stored bottom-to-top
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int w, h, row, col;
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uint8_t r, g, b;
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uint32_t pos = 0, startTime = millis();
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if((x >= tft.width()) || (y >= tft.height())) return;
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Serial.println();
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Serial.print(F("Loading image '"));
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Serial.print(filename);
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Serial.println('\'');
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// Open requested file on SD card
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if ((bmpFile = SD.open(filename)) == NULL) {
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Serial.print(F("File not found"));
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return;
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}
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// Parse BMP header
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if(read16(bmpFile) == 0x4D42) { // BMP signature
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Serial.print(F("File size: ")); Serial.println(read32(bmpFile));
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(void)read32(bmpFile); // Read & ignore creator bytes
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bmpImageoffset = read32(bmpFile); // Start of image data
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Serial.print(F("Image Offset: ")); Serial.println(bmpImageoffset, DEC);
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// Read DIB header
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Serial.print(F("Header size: ")); Serial.println(read32(bmpFile));
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bmpWidth = read32(bmpFile);
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bmpHeight = read32(bmpFile);
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if(read16(bmpFile) == 1) { // # planes -- must be '1'
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bmpDepth = read16(bmpFile); // bits per pixel
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Serial.print(F("Bit Depth: ")); Serial.println(bmpDepth);
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if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
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goodBmp = true; // Supported BMP format -- proceed!
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Serial.print(F("Image size: "));
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Serial.print(bmpWidth);
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Serial.print('x');
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Serial.println(bmpHeight);
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// BMP rows are padded (if needed) to 4-byte boundary
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rowSize = (bmpWidth * 3 + 3) & ~3;
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// If bmpHeight is negative, image is in top-down order.
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// This is not canon but has been observed in the wild.
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if(bmpHeight < 0) {
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bmpHeight = -bmpHeight;
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flip = false;
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}
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// Crop area to be loaded
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w = bmpWidth;
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h = bmpHeight;
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if((x+w-1) >= tft.width()) w = tft.width() - x;
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if((y+h-1) >= tft.height()) h = tft.height() - y;
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// Set TFT address window to clipped image bounds
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tft.setAddrWindow(x, y, x+w-1, y+h-1);
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for (row=0; row<h; row++) { // For each scanline...
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// Seek to start of scan line. It might seem labor-
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// intensive to be doing this on every line, but this
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// method covers a lot of gritty details like cropping
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// and scanline padding. Also, the seek only takes
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// place if the file position actually needs to change
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// (avoids a lot of cluster math in SD library).
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if(flip) // Bitmap is stored bottom-to-top order (normal BMP)
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pos = bmpImageoffset + (bmpHeight - 1 - row) * rowSize;
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else // Bitmap is stored top-to-bottom
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pos = bmpImageoffset + row * rowSize;
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if(bmpFile.position() != pos) { // Need seek?
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bmpFile.seek(pos);
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buffidx = sizeof(sdbuffer); // Force buffer reload
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}
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for (col=0; col<w; col++) { // For each pixel...
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// Time to read more pixel data?
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if (buffidx >= sizeof(sdbuffer)) { // Indeed
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bmpFile.read(sdbuffer, sizeof(sdbuffer));
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buffidx = 0; // Set index to beginning
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}
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// Convert pixel from BMP to TFT format, push to display
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b = sdbuffer[buffidx++];
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g = sdbuffer[buffidx++];
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r = sdbuffer[buffidx++];
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tft.pushColor(tft.color565(r,g,b));
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} // end pixel
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} // end scanline
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Serial.print(F("Loaded in "));
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Serial.print(millis() - startTime);
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Serial.println(" ms");
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} // end goodBmp
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}
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}
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bmpFile.close();
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if(!goodBmp) Serial.println(F("BMP format not recognized."));
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}
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// These read 16- and 32-bit types from the SD card file.
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// BMP data is stored little-endian, Arduino is little-endian too.
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// May need to reverse subscript order if porting elsewhere.
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uint16_t read16(File &f) {
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uint16_t result;
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((uint8_t *)&result)[0] = f.read(); // LSB
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((uint8_t *)&result)[1] = f.read(); // MSB
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return result;
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}
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uint32_t read32(File &f) {
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uint32_t result;
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((uint8_t *)&result)[0] = f.read(); // LSB
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((uint8_t *)&result)[1] = f.read();
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((uint8_t *)&result)[2] = f.read();
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((uint8_t *)&result)[3] = f.read(); // MSB
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return result;
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}

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