I have received some modules from AliExpress and the first thing I needed to do was understand how these works. so I made an example where the code loads all pictures from the MicroSD and show them on the screen.
It’s a stupid example but I have needed too many hours because I have had problems to make it work at the same time, because both need the SPI protocol for working. Finally, it was as much easy as how to connect the SCK and MOSI pins at both modules.
The development board is a TTGO T8 V1.8 ESP32-WROVER-B, the screen include the GC9A01 driver.
The development board is not the most I like but it has MicroSD reader, an ESP32 WROVER, and an auto-boot feature. I want to make my own board with these specifications so this development board is perfect for trying everything before making my board.
This is the code of the video:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 | #include <Arduino_GFX_Library.h> #include "JpegClass.h" #include <FS.h> #include <SD.h> #include <SPI.h> #define MISO 2 #define SCLK 14 //SCL #define MOSI 15 //SDA #define SD_CS 13 #define TFT_CS 5 #define TFT_BLK 22 #define TFT_DC 27 #define TFT_RST 33 Arduino_DataBus *bus = new Arduino_HWSPI(TFT_DC, TFT_CS, SCLK, MOSI, MISO, true); Arduino_GC9A01 *gfx = new Arduino_GC9A01(bus, TFT_RST, 0, true); static JpegClass jpegClass; void setup() { Serial.begin(115200); //Init MicroSD SPI.begin(SCLK, MISO, MOSI, SD_CS); if( !SD.begin(SD_CS) ) { Serial.println("Card Mount Failed"); gfx->println(F("ERROR: Card Mount Failed!")); return; } uint8_t cardType = SD.cardType(); if( cardType == CARD_NONE ) { Serial.println("No SD card attached"); gfx->println(F("ERROR: No SD card attached")); return; } Serial.print("SD Card Type: "); switch( cardType ) { case CARD_MMC: Serial.println("MMC"); break; case CARD_SD: Serial.println("SDSC"); break; case CARD_SDHC: Serial.println("SDHC"); break; default: Serial.println("UNKNOWN"); } //Init Display gfx->begin(); gfx->fillScreen(BLACK); #ifdef TFT_BLK pinMode(TFT_BLK, OUTPUT); digitalWrite(TFT_BLK, HIGH); #endif } void loop() { unsigned long start = millis(); File root = SD.open("/img"); printDirectory(root, 0); Serial.printf("Time used: %lu\n", millis() - start); } void printDirectory(File dir, int numTabs) { while( true ) { File entry = dir.openNextFile(); if( !entry ) { //No more files. Return to the first file in the directory dir.rewindDirectory(); break; } for( uint8_t i=0 ; i<numTabs ; i++ ) { Serial.print('\t'); } Serial.print(entry.name()); if( entry.isDirectory() ) { Serial.println("/"); printDirectory(entry, numTabs+1); } else { //Files have sizes, directories do not Serial.print("\t\t"); Serial.println(entry.size(), DEC); jpegClass.draw(entry, jpegDrawCallback, true, 0, 0, gfx->width(), gfx->height()); delay(1500); } } } static int jpegDrawCallback(JPEGDRAW *pDraw) { gfx->draw16bitBeRGBBitmap(pDraw->x, pDraw->y, pDraw->pPixels, pDraw->iWidth, pDraw->iHeight); } |
The original example from the library needs the JpegClass, I have needed to modify it a bit because it was made for receiving a file name, but now it is receiving a file directly:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | /******************************************************************************* * JPEGDEC Wrapper Class * * Dependent libraries: * JPEGDEC: https://github.com/bitbank2/JPEGDEC.git ******************************************************************************/ #ifndef _JPEGCLASS_H_ #define _JPEGCLASS_H_ #include <JPEGDEC.h> class JpegClass { public: void draw( File f, JPEG_DRAW_CALLBACK *jpegDrawCallback, bool useBigEndian, int x, int y, int widthLimit, int heightLimit ) { _jpeg.open(f, jpegDrawCallback); // scale to fit height int _scale; int iMaxMCUs; float ratio = (float)_jpeg.getHeight() / heightLimit; if (ratio <= 1) { _scale = 0; iMaxMCUs = widthLimit / 16; } else if (ratio <= 2) { _scale = JPEG_SCALE_HALF; iMaxMCUs = widthLimit / 8; } else if (ratio <= 4) { _scale = JPEG_SCALE_QUARTER; iMaxMCUs = widthLimit / 4; } else { _scale = JPEG_SCALE_EIGHTH; iMaxMCUs = widthLimit / 2; } _jpeg.setMaxOutputSize(iMaxMCUs); if (useBigEndian) { _jpeg.setPixelType(RGB565_BIG_ENDIAN); } _jpeg.decode(x, y, _scale); _jpeg.close(); } private: JPEGDEC _jpeg; }; #endif // _JPEGCLASS_H_ |
Hi, nice project.
I tested it and got into: rst:0x8 (TG1WDT_SYS_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
loop, how can fix it please?
Thanks