Getting Jpg image from SD_card to sprite (or memory) - ESP32

[SL06]

Hi, I am new to TFT. I have a set of 9 openstreetmap tiles 256 x 256 pixels Jpeg, stored ion a SD_card and would like to put them in memory to be able to move the displayed portion of the map on the TFT screen smoothly. I have tried to put the transfert the images in a series sprites, but was unsuccessful. I am not shure if its the proper approach. Here is the code for simple jpeg file, based on the Jpg_decoder SD__card esemple.

`// Example for library:
// https://github.com/Bodmer/TJpg_Decoder

// This example if for an ESP8266 or ESP32, it renders a Jpeg file
// that is stored in a SD card file. The test image is in the sketch
// "data" folder (press Ctrl+K to see it). You must save the image
// to the SD card using you PC.

// Include the jpeg decoder library
#include <TJpg_Decoder.h>

// Include SD
#define FS_NO_GLOBALS
#include <FS.h>
#ifdef ESP32
#include "SPIFFS.h" // ESP32 only
#endif

//#define SD_CS 4

// Include the TFT library https://github.com/Bodmer/TFT_eSPI
#include "SPI.h"
#include <TFT_eSPI.h> // Hardware-specific library
TFT_eSPI tft = TFT_eSPI(); // Invoke custom library

TFT_eSprite spr = TFT_eSprite(&tft);

// This next function will be called during decoding of the jpeg file to
// render each block to the TFT. If you use a different TFT library
// you will need to adapt this function to suit.
bool tft_output(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t* bitmap)
{
// Stop further decoding as image is running off bottom of screen
if ( y >= 240 ) return 0; // sprite height - block size

//Serial.println(w); // 16... last 12

// This function will clip the image block rendering automatically at the TFT boundaries
//tft.pushImage(x, y, w, h, bitmap);
if ( x <= 239) { // sprite height - block size
spr.pushImage(x, y, w, h, bitmap);}

// This might work instead if you adapt the sketch to use the Adafruit_GFX library
// tft.drawRGBBitmap(x, y, bitmap, w, h);

// Return 1 to decode next block
return 1;
}

void setup()
{
Serial.begin(115200);
Serial.println("\n\n Testing TJpg_Decoder library");

// Initialise SD before TFT
//if (!SD.begin(SD_CS)) {
if (!SD.begin()) {
Serial.println(F("SD.begin failed!"));
while (1) delay(0);
}
Serial.println("\r\nInitialisation done.");

// Initialise the TFT
tft.begin();
tft.setTextColor(0xFFFF, 0x0000);
tft.fillScreen(TFT_BLACK);
tft.setSwapBytes(true); // We need to swap the colour bytes (endianess)

// The jpeg image can be scaled by a factor of 1, 2, 4, or 8
TJpgDec.setJpgScale(1);

// The decoder must be given the exact name of the rendering function above
TJpgDec.setCallback(tft_output);

spr.createSprite(256, 256);
}

void loop()
{
tft.fillScreen(TFT_RED);

// Time recorded for test purposes
uint32_t t = millis();

// Get the width and height in pixels of the jpeg if you wish
uint16_t w = 0, h = 0;
TJpgDec.getSdJpgSize(&w, &h, "/EagleEye.jpg");
Serial.print("Width = "); Serial.print(w); Serial.print(", height = "); Serial.println(h);

// Draw the image, top left at 0,0
//TJpgDec.drawSdJpg(0, 0, "/panda.jpg");

TJpgDec.drawSdJpg(0, 0, "/EagleEye.jpg");
// How much time did rendering take
spr.pushSprite(50,50);

t = millis() - t;
Serial.print(t); Serial.println(" ms");

// Wait before drawing again
delay(10000);
}
`

[Bodmer]

I suspect that sprite creation fails since 128kbytes of RAM will be required. If you have onboard PSRAM then it must be enabled. Try a smaller sprite, say 256x64.

[Bodmer]

To check for successful creation you can use code like this:

  if (img.createSprite(100, 100) == nullptr) Serial.println("Sprite NOT created, insufficient RAM!");
  else Serial.println("YES! Sprite created.");

[SL06]

Thanks for those Email. Setting the colour depth to 8 bits makes the sprite work. : spr.setColorDepth(8); 256 x 256 bytes is OK With 16 bit, the size is limited to about half (not completely tested). Setting the PSRAM to true did not help. spr.setAttribute(PSRAM_ENABLE, true); My board is an ESPDUINO-32 HW-729 with the ESP32-D0WDQ6 (revision I have checked the PRAM with the following command and it told PSRAM size = 0, although Serial.printf("PSRAM Total heap %d, PSRAM Free Heap %d\n",ESP.getPsramSize(),ESP.getFreePsram()); This code also give me PSRAM not available…. if(psramInit()){ Serial.println("\nPSRAM is correctly initialized"); }else{ Serial.println("PSRAM not available"); } I have the latest arduino version and ESP-IDE. I assume that the PSRAM is activated by default and that I don’t have to upload any special library other may be #include <Arduino.h>… I will keep looking. Any suggestion is appreciated. Sylvain

…

Le 24 nov. 2022 à 18:09, Bodmer ***@***.***> a écrit : To check for successful creation you can use code like this: if (img.createSprite(100, 100) == nullptr) Serial.println("Sprite NOT created, insufficient RAM!"); else Serial.println("YES! Sprite created."); — Reply to this email directly, view it on GitHub <#2199 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIWMIQO4IU7JCNCFT7RG3MTWJ7YQ7ANCNFSM6AAAAAASJGJHX4>. You are receiving this because you authored the thread.

[SL06]

Just found this. My ESP32 version does not have PSRAM according to this. https://www.upesy.com/blogs/tutorials/get-more-ram-on-esp32-with-psram <https://www.upesy.com/blogs/tutorials/get-more-ram-on-esp32-with-psram> I would need Oe of those. ESP32-WROVER-B ESP32-WROVER Thanks again. Sylvain

…

Le 24 nov. 2022 à 19:24, S Lareau ***@***.***> a écrit : Thanks for those Email. Setting the colour depth to 8 bits makes the sprite work. : spr.setColorDepth(8); 256 x 256 bytes is OK With 16 bit, the size is limited to about half (not completely tested). Setting the PSRAM to true did not help. spr.setAttribute(PSRAM_ENABLE, true); My board is an ESPDUINO-32 HW-729 with the ESP32-D0WDQ6 (revision I have checked the PRAM with the following command and it told PSRAM size = 0, although Serial.printf("PSRAM Total heap %d, PSRAM Free Heap %d\n",ESP.getPsramSize(),ESP.getFreePsram()); This code also give me PSRAM not available…. if(psramInit()){ Serial.println("\nPSRAM is correctly initialized"); }else{ Serial.println("PSRAM not available"); } I have the latest arduino version and ESP-IDE. I assume that the PSRAM is activated by default and that I don’t have to upload any special library other may be #include <Arduino.h>… I will keep looking. Any suggestion is appreciated. Sylvain > Le 24 nov. 2022 à 18:09, Bodmer ***@***.*** ***@***.***>> a écrit : > > > To check for successful creation you can use code like this: > > if (img.createSprite(100, 100) == nullptr) Serial.println("Sprite NOT created, insufficient RAM!"); > else Serial.println("YES! Sprite created."); > — > Reply to this email directly, view it on GitHub <#2199 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AIWMIQO4IU7JCNCFT7RG3MTWJ7YQ7ANCNFSM6AAAAAASJGJHX4>. > You are receiving this because you authored the thread. >