109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
// A simple image slideshow which reads all the .JPG files from the root
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// directory of a SD card and shows each for 1 second on an ILI9341 display.
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#include <PNGdec.h>
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#include <ILI9341_t3.h>
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#include <Bounce.h>
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#include <SD.h>
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#define TFT_DC 9
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#define TFT_CS 10
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ILI9341_t3 tft = ILI9341_t3(TFT_CS, TFT_DC);
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PNG png;
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// Setup - initialize ILI9341 display, wait for serial monitor, open SD card
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void setup() {
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pinMode(34, INPUT_PULLDOWN);
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pinMode(33, OUTPUT);
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digitalWrite(33, HIGH); // pushbuttons short pins 33 & 34 together
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Serial.begin(115200);
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tft.begin();
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tft.setRotation(3);
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tft.fillScreen(ILI9341_BLACK);
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tft.setTextColor(ILI9341_YELLOW);
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tft.setTextSize(2);
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tft.println("Waiting for Arduino Serial Monitor...");
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while (!Serial && millis() < 3000); // wait up to 3 seconds for Arduino Serial Monitor
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Serial.println("ILI9341 Slideshow");
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tft.fillScreen(ILI9341_BLACK);
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tft.setCursor(0, 0);
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while (!SD.begin(4/*BUILTIN_SDCARD*/)) {
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Serial.println("Unable to access SD Card");
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tft.println("Unable to access SD Card");
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delay(1000);
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}
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}
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// Functions to access a file on the SD card
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File myfile;
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void * myOpen(const char *filename, int32_t *size) {
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Serial.printf("Attempting to open %s\n", filename);
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myfile = SD.open(filename);
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*size = myfile.size();
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return &myfile;
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}
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void myClose(void *handle) {
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if (myfile) myfile.close();
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}
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int32_t myRead(PNGFILE *handle, uint8_t *buffer, int32_t length) {
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if (!myfile) return 0;
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return myfile.read(buffer, length);
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}
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int32_t mySeek(PNGFILE *handle, int32_t position) {
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if (!myfile) return 0;
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return myfile.seek(position);
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}
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// Function to draw pixels to the display
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int PNGDraw(PNGDRAW *pDraw) {
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uint16_t usPixels[320];
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png.getLineAsRGB565(pDraw, usPixels, PNG_RGB565_LITTLE_ENDIAN, 0xffffffff);
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tft.writeRect(0, pDraw->y + 24, pDraw->iWidth, 1, usPixels);
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return 1;
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}
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// Main loop, scan for all .PNG files on the card and display them
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void loop() {
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int rc, filecount = 0;
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tft.setCursor(0, 0);
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File dir = SD.open("/");
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while (true) {
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File entry = dir.openNextFile();
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if (!entry) break;
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if (entry.isDirectory() == false) {
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const char *name = entry.name();
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const int len = strlen(name);
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if (len > 3 && strcmp(name + len - 3, "PNG") == 0) {
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Serial.print("File: ");
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Serial.println(name);
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tft.fillScreen(ILI9341_BLACK);
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tft.setCursor(0, 0);
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tft.print("File: ");
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tft.println(name);
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rc = png.open((const char *)name, myOpen, myClose, myRead, mySeek, PNGDraw);
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if (rc == PNG_SUCCESS) {
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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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rc = png.decode(NULL, 0);
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png.close();
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}
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filecount = filecount + 1;
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// if (digitalRead(34) == LOW) {
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// skip delay between images when pushbutton is pressed
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delay(2000);
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// }
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}
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}
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entry.close();
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}
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if (filecount == 0) {
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Serial.println("No .PNG files found");
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tft.println("No .PNG files found");
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delay(2000);
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}
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}
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