- Sun Nov 22, 2015 8:50 am
#34675
I say more ... I have a example showing color jpeg file from spiffs on monochrome oled
please check my fork from MakotoKurauchi/JPEGDecoder on my github
https://github.com/reaper7/JPEGDecoder(part of code for display file on oled from
https://github.com/kodera2t/TinyBasicPlus_OLED_support)
Code: Select all#include <Arduino.h>
#include <FS.h>
#include <SPI.h>
#include <Wire.h>
#include <JPEGDecoder.h>
#include <Adafruit_GFX.h>
#include <ESP_SSD1306.h>
ESP_SSD1306 display(false); //reset disable
#define SDAPIN 12
#define SCLPIN 14
void setup() {
Serial.begin(115200);
Serial.print("Initializing FS...");
if (!SPIFFS.begin()) {
Serial.println("failed!");
return;
}
Serial.println("done.");
Serial.print("Initializing OLED...");
//configure i2c
Wire.begin(SDAPIN, SCLPIN); //sda, scl
//configure OLED SSD1306 display
display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false);
display.clearDisplay();
display.fillScreen(BLACK);
//display.setTextSize(2);
display.setTextColor(WHITE);
display.setTextWrap(false);
display.display();
display.setTextSize(2);
display.setCursor(0, 0);
display.print("START");
display.display();
Serial.println("done.");
Serial.println("initialization done.");
}
void loop() {
char str[100];
char filename[] = "/test.jpg";
uint8 *pImg;
int x,y,bx,by;
int val,valmax;
// Decoding start
JpegDec.decode(filename,0);
// Image Information
Serial.print("Width :"); Serial.println(JpegDec.width);
Serial.print("Height :"); Serial.println(JpegDec.height);
Serial.print("Components:"); Serial.println(JpegDec.comps);
Serial.print("MCU / row :"); Serial.println(JpegDec.MCUSPerRow);
Serial.print("MCU / col :"); Serial.println(JpegDec.MCUSPerCol);
Serial.print("Scan type :"); Serial.println(JpegDec.scanType);
Serial.print("MCU width :"); Serial.println(JpegDec.MCUWidth);
Serial.print("MCU height:"); Serial.println(JpegDec.MCUHeight);
Serial.println("");
/*
// Output CSV
sprintf(str,"#SIZE,%d,%d",JpegDec.width,JpegDec.height);
Serial.println(str);
*/
while(JpegDec.read()) {
pImg = JpegDec.pImage;
for(by=0; by<JpegDec.MCUHeight; by++) {
for(bx=0; bx<JpegDec.MCUWidth; bx++) {
x = JpegDec.MCUx * JpegDec.MCUWidth + bx;
y = JpegDec.MCUy * JpegDec.MCUHeight + by;
if(x<JpegDec.width && y<JpegDec.height) {
if(JpegDec.comps == 1) { // Grayscale
//sprintf(str,"#RGB,%d,%d,%u", x, y, pImg[0]);
//Serial.println(str);
} else { // RGB
//sprintf(str,"#RGB,%d,%d,%u,%u,%u", x, y, pImg[0], pImg[1], pImg[2]);
val=0.299*pImg[0]+0.587*pImg[1]+0.114*pImg[2];
//sprintf(str,"#RGB,%d,%d,%d", x, y, val);
if(val>valmax) {
valmax=val;
}
val=val/55;
if(x%4==0) {
switch(val) {
case 3:
display.drawPixel(3*x/4,y/2,WHITE);
display.drawPixel(3*x/4+1,y/2,WHITE);
display.drawPixel(3*x/4+2,y/2,WHITE);
break;
case 2:
display.drawPixel(3*x/4,y/2,WHITE);
display.drawPixel(3*x/4+1,y/2,BLACK);
display.drawPixel(3*x/4+2,y/2,WHITE);
break;
case 1:
display.drawPixel(3*x/4,y/2,BLACK);
display.drawPixel(3*x/4+1,y/2,WHITE);
display.drawPixel(3*x/4+2,y/2,BLACK);
break;
case 0:
display.drawPixel(3*x/4,y/2,BLACK);
display.drawPixel(3*x/4+1,y/2,BLACK);
display.drawPixel(3*x/4+2,y/2,BLACK);
break;
default:
display.drawPixel(3*x/4,y/2,WHITE);
display.drawPixel(3*x/4+1,y/2,WHITE);
display.drawPixel(3*x/4+2,y/2,WHITE);
break;
}
}
//pic[x/2][y/2]=val;
//Serial.println(str);
}
}
pImg += JpegDec.comps ;
}
}
}
display.display();
delay(5000);
}
oled_spiffs.jpg
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Last edited by reaper7 on Sun Nov 22, 2015 11:55 am, edited 2 times in total.
