// A simple image slideshow which reads all the .JPG files from the root
// directory of a SD card and shows each for 1 second on an ILI9341 display.
#include <JPEGDEC.h>
#include <ST7735_t3.h>
#include <ST7789_t3.h>
#include <Bounce.h>
#include <SD.h>
#define TFT_RST 8
#define TFT_DC 9
#define TFT_CS 10
ST7789_t3 tft = ST7789_t3(TFT_CS, TFT_DC, TFT_RST);
JPEGDEC jpeg;
// Setup - initialize ILI9341 display, wait for serial monitor, open SD card
void setup() {
pinMode(34, INPUT_PULLDOWN);
pinMode(33, OUTPUT);
digitalWrite(33, HIGH); // pushbuttons short pins 33 & 34 together
Serial.begin(115200);
tft.init(240, 320); // Init ST7789 2.0" 320x240
tft.setRotation(0);
tft.fillScreen(ST77XX_BLACK);
tft.setTextColor(ST77XX_YELLOW);
tft.setTextSize(2);
tft.println("Waiting for Arduino Serial Monitor...");
while (!Serial && millis() < 3000); // wait up to 3 seconds for Arduino Serial Monitor
Serial.println("ILI9341 Slideshow");
tft.fillScreen(ST77XX_BLACK);
tft.setCursor(0, 0);
[COLOR="#FF0000"]while (!SD.begin(4/*BUILTIN_SDCARD*/)) {[/COLOR]
Serial.println("Unable to access SD Card");
tft.println("Unable to access SD Card");
delay(1000);
}
}
// Functions to access a file on the SD card
File myfile;
void * myOpen(const char *filename, int32_t *size) {
myfile = SD.open(filename);
*size = myfile.size();
return &myfile;
}
void myClose(void *handle) {
if (myfile) myfile.close();
}
int32_t myRead(JPEGFILE *handle, uint8_t *buffer, int32_t length) {
if (!myfile) return 0;
return myfile.read(buffer, length);
}
int32_t mySeek(JPEGFILE *handle, int32_t position) {
if (!myfile) return 0;
return myfile.seek(position);
}
// Function to draw pixels to the display
void JPEGDraw(JPEGDRAW *pDraw) {
//Serial.printf("jpeg draw: x,y=%d,%d, cx,cy = %d,%d\n",
//pDraw->x, pDraw->y, pDraw->iWidth, pDraw->iHeight);
tft.writeRect(pDraw->x, pDraw->y, pDraw->iWidth, pDraw->iHeight, pDraw->pPixels);
}
// Main loop, scan for all .JPG files on the card and display them
void loop() {
int filecount = 0;
tft.setCursor(0, 0);
File dir = SD.open("/");
while (true) {
File entry = dir.openNextFile();
if (!entry) break;
if (entry.isDirectory() == false) {
const char *name = entry.name();
const int len = strlen(name);
if (len > 3 && strcmp(name + len - 3, "JPG") == 0) {
Serial.print("File: ");
Serial.println(name);
tft.print("File: ");
tft.println(name);
jpeg.open((const char *)name, myOpen, myClose, myRead, mySeek, JPEGDraw);
jpeg.decode(0, 0, 0);
jpeg.close();
filecount = filecount + 1;
if (digitalRead(34) == LOW) {
// skip delay between images when pushbutton is pressed
delay(1000);
}
}
}
entry.close();
}
if (filecount == 0) {
Serial.println("No .JPG files found");
tft.println("No .JPG files found");
delay(2000);
}
}
