100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
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// This example if for processors with LittleFS capability (e.g. RP2040,
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// ESP32, ESP8266). It renders a png file that is stored in LittleFS
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// using the PNGdec library (available via library manager).
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// The test image is in the sketch "data" folder (press Ctrl+K to see it).
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// You must upload the image to LittleFS using the Arduino IDE Tools Data
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// Upload menu option (you may need to install extra tools for that).
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// Don't forget to use the Arduino IDE Tools menu to allocate a LittleFS
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// memory partition before uploading the sketch and data!
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#include <LittleFS.h>
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#define FileSys LittleFS
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// Include the PNG decoder library
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#include <PNGdec.h>
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PNG png;
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#define MAX_IMAGE_WDITH 240 // Adjust for your images
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int16_t xpos = 0;
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int16_t ypos = 0;
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// Include the TFT library https://github.com/Bodmer/TFT_eSPI
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#include "SPI.h"
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#include <TFT_eSPI.h> // Hardware-specific library
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TFT_eSPI tft = TFT_eSPI(); // Invoke custom library
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//====================================================================================
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// Setup
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//====================================================================================
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void setup()
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{
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Serial.begin(115200);
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Serial.println("\n\n Using the PNGdec library");
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// Initialise FS
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if (!FileSys.begin()) {
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Serial.println("LittleFS initialisation failed!");
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while (1) yield(); // Stay here twiddling thumbs waiting
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}
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// Initialise the TFT
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tft.begin();
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tft.fillScreen(TFT_BLACK);
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Serial.println("\r\nInitialisation done.");
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}
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//====================================================================================
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// Loop
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//====================================================================================
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void loop()
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{
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// Scan LittleFS and load any *.png files
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File root = LittleFS.open("/", "r");
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while (File file = root.openNextFile()) {
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String strname = file.name();
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strname = "/" + strname;
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Serial.println(file.name());
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// If it is not a directory and filename ends in .png then load it
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if (!file.isDirectory() && strname.endsWith(".png")) {
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// Pass support callback function names to library
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int16_t rc = png.open(strname.c_str(), pngOpen, pngClose, pngRead, pngSeek, pngDraw);
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if (rc == PNG_SUCCESS) {
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tft.startWrite();
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Serial.printf("image specs: (%d x %d), %d bpp, pixel type: %d\n", png.getWidth(), png.getHeight(), png.getBpp(), png.getPixelType());
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uint32_t dt = millis();
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if (png.getWidth() > MAX_IMAGE_WDITH) {
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Serial.println("Image too wide for allocated line buffer size!");
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}
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else {
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rc = png.decode(NULL, 0);
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png.close();
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}
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tft.endWrite();
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// How long did rendering take...
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Serial.print(millis()-dt); Serial.println("ms");
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}
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}
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delay(3000);
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tft.fillScreen(random(0x10000));
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}
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}
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//=========================================v==========================================
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// pngDraw
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//====================================================================================
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// This next function will be called during decoding of the png file to
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// render each image line to the TFT. If you use a different TFT library
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// you will need to adapt this function to suit.
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// Callback function to draw pixels to the display
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void pngDraw(PNGDRAW *pDraw) {
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uint16_t lineBuffer[MAX_IMAGE_WDITH];
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png.getLineAsRGB565(pDraw, lineBuffer, PNG_RGB565_BIG_ENDIAN, 0xffffffff);
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tft.pushImage(xpos, ypos + pDraw->y, pDraw->iWidth, 1, lineBuffer);
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}
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