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Thread: Converting an example to SDfat from SD library

  1. #1

    Converting an example to SDfat from SD library

    I need to get this simple sketch to use the SDfat library instead of the default SD.

    If anyone can tell me what I'm doing wrong I'd greatly appreciate it. I've tried to cut it down to the bare minimum for readability:
    Code:
    #define USE_FRAME_BUFFER 
    
    #define TFT_SCLK 32  // SCLK can also use pin 14
    #define TFT_MOSI 0  // MOSI can also use pin 7
    #define TFT_CS   30  // CS & DC can use pins 2, 6, 9, 10, 15, 20, 21, 22, 23
    #define TFT_DC   31  //  but certain pairs must NOT be used: 2+10, 6+9, 20+23, 21+22
    #define TFT_RST  29  // RST can use any pin
    //#define SD_CS    55  // CS for SD card, can use any pin
    
    #include <Adafruit_GFX.h>    // Core graphics library
    #include <ST7789_t3.h> // Hardware-specific library
    #include <SPI.h>
    
    // For 1.54" or other TFT with ST7789, This has worked with some ST7789
    // displays without CS pins, for those you can pass in -1 or 0xff for CS
    // More notes by the tft.init call
    ST7789_t3 tft = ST7789_t3(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);
    
    // standard SD library  // works 
    //#include <SD.h>
    //const int chipSelect = BUILTIN_SDCARD;
    
    //SdioEX SD library  // doesn't work
    #include "SDFat.h"
    SdFatSdioEX SD;
    //File bmpFile;  // redundant?
    
    #include <SPI.h>
    
    void setup(void) {
      //pinMode(SD_CS, INPUT_PULLUP);  // don't touch the SD card
      Serial.begin(9600);
      Serial.print("hello!");
    
    //     SD card init      //
    
    // //standard SD library
    //  if (!SD.begin(chipSelect)) {
    //    Serial.println("initialization failed!");
    //    return;
    //  }
    //  Serial.println("initialization done.");
    
    // //SdioEX SD library
      if (!SD.begin()) {
        Serial.println("initialization failed!");
        return;
      }
      Serial.println("initialization done.");  
    
    //     Display init      
      tft.init(240, 240);   // initialize a ST7789 chip, 240x240 pixels
      Serial.println("init display complete");
    
    //     Display test
      tft.fillScreen(0x0000);
      delay(2000);
      tft.setRotation(2);
      bmpDraw("vui24.bmp", 0, 0);  //vui24.bmp is a 176k, 24 bit, 240x240 bitmap that works with this display
    
    }
    
    void loop() {
    // nothing needed here
    }
    
    #define BUFFPIXEL 20
    
    void bmpDraw(const char *filename, uint8_t x, uint8_t y) {
    
      File     bmpFile;
      int      bmpWidth, bmpHeight;   // W+H in pixels
      uint8_t  bmpDepth;              // Bit depth (currently must be 24)
      uint32_t bmpImageoffset;        // Start of image data in file
      uint32_t rowSize;               // Not always = bmpWidth; may have padding
      uint8_t  sdbuffer[3*BUFFPIXEL]; // pixel buffer (R+G+B per pixel)
      uint8_t  buffidx = sizeof(sdbuffer); // Current position in sdbuffer
      boolean  goodBmp = false;       // Set to true on valid header parse
      boolean  flip    = true;        // BMP is stored bottom-to-top
      int      w, h, row, col;
      uint8_t  r, g, b;
      uint32_t pos = 0, startTime = millis();
    
      if((x >= tft.width()) || (y >= tft.height())) return;
    
      Serial.println();
      Serial.print("Loading image '");
      Serial.print(filename);
      Serial.println('\'');
    
      // Open requested file on SD card
      bmpFile = SD.open(filename);
      if (!bmpFile) {
        Serial.print("File not found");
        tft.fillScreen(0x0000);
        tft.setCursor(12, tft.height()/2 - 12);
        tft.print("Unable to");
        tft.setCursor(12, tft.height()/2 - 0);
        tft.print("read file: ");
        tft.setCursor(12, tft.height()/2 + 12);
        tft.setTextColor(0xffff);
        tft.print(filename);
        return;
      }
    
      // Parse BMP header
      if(read16(bmpFile) == 0x4D42) { // BMP signature
        Serial.print("File size: "); Serial.println(read32(bmpFile));
        (void)read32(bmpFile); // Read & ignore creator bytes
        bmpImageoffset = read32(bmpFile); // Start of image data
        Serial.print("Image Offset: "); Serial.println(bmpImageoffset, DEC);
        // Read DIB header
        Serial.print("Header size: "); Serial.println(read32(bmpFile));
        bmpWidth  = read32(bmpFile);
        bmpHeight = read32(bmpFile);
        if(read16(bmpFile) == 1) { // # planes -- must be '1'
          bmpDepth = read16(bmpFile); // bits per pixel
          Serial.print("Bit Depth: "); Serial.println(bmpDepth);
          if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
    
            goodBmp = true; // Supported BMP format -- proceed!
            Serial.print("Image size: ");
            Serial.print(bmpWidth);
            Serial.print('x');
            Serial.println(bmpHeight);
    
            // BMP rows are padded (if needed) to 4-byte boundary
            rowSize = (bmpWidth * 3 + 3) & ~3;
    
            // If bmpHeight is negative, image is in top-down order.
            // This is not canon but has been observed in the wild.
            if(bmpHeight < 0) {
              bmpHeight = -bmpHeight;
              flip      = false;
            }
    
            // Crop area to be loaded
            w = bmpWidth;
            h = bmpHeight;
            if((x+w-1) >= tft.width())  w = tft.width()  - x;
            if((y+h-1) >= tft.height()) h = tft.height() - y;
    
            // Set TFT address window to clipped image bounds
            tft.setAddrWindow(x, y, x+w-1, y+h-1);
    
            for (row=0; row<h; row++) { // For each scanline...
    
              // Seek to start of scan line.  It might seem labor-
              // intensive to be doing this on every line, but this
              // method covers a lot of gritty details like cropping
              // and scanline padding.  Also, the seek only takes
              // place if the file position actually needs to change
              // (avoids a lot of cluster math in SD library).
              if(flip) // Bitmap is stored bottom-to-top order (normal BMP)
                pos = bmpImageoffset + (bmpHeight - 1 - row) * rowSize;
              else     // Bitmap is stored top-to-bottom
                pos = bmpImageoffset + row * rowSize;
              if(bmpFile.position() != pos) { // Need seek?
                bmpFile.seek(pos);
                buffidx = sizeof(sdbuffer); // Force buffer reload
              }
    
              for (col=0; col<w; col++) { // For each pixel...
                // Time to read more pixel data?
                if (buffidx >= sizeof(sdbuffer)) { // Indeed
                  bmpFile.read(sdbuffer, sizeof(sdbuffer));
                  buffidx = 0; // Set index to beginning
                }
    
                // Convert pixel from BMP to TFT format, push to display
                b = sdbuffer[buffidx++];
                g = sdbuffer[buffidx++];
                r = sdbuffer[buffidx++];
                tft.pushColor(tft.Color565(r,g,b));
              } // end pixel
            } // end scanline
            Serial.print("Loaded in ");
            Serial.print(millis() - startTime);
            Serial.println(" ms");
          } // end goodBmp
        }
      }
    
      bmpFile.close();
      if(!goodBmp) Serial.println("BMP format not recognized.");
    }
    
    // These read 16- and 32-bit types from the SD card file.
    // BMP data is stored little-endian, Arduino is little-endian too.
    // May need to reverse subscript order if porting elsewhere.
    
    uint16_t read16(File f) {
      uint16_t result;
      ((uint8_t *)&result)[0] = f.read(); // LSB
      ((uint8_t *)&result)[1] = f.read(); // MSB
      return result;
    }
    
    uint32_t read32(File f) {
      uint32_t result;
      ((uint8_t *)&result)[0] = f.read(); // LSB
      ((uint8_t *)&result)[1] = f.read();
      ((uint8_t *)&result)[2] = f.read();
      ((uint8_t *)&result)[3] = f.read(); // MSB
      return result;
    }
    
    //}
    bmpDraw is straight out of the spitftbitmap example sketch that is included with the Teensy optimized ST7735 library.

    SDfat works fine in a different program where I've used it to load and save settings for the device I'm building, and I have duplicated the way it's initialized into this example, but when I call bmpDraw I get this in the serial monitor:

    ---
    Loading image 'vui24.bmp'
    File size: 2738376002
    Image Offset: 2738376002
    Header size: 2738376002
    BMP format not recognized.
    ---

    The file is 176k, not 2.xGB like this is showing (and it's a 512mb microSD card...). I don't understand why SDfat works for my primary project but will not for this example. If I use the normal SD library in the example sketch the image will load and display properly so everything else works.

    Thanks in advance.

  2. #2
    I found the information needed, here:
    https://forum.pjrc.com/threads/40871...file-read-fail

    I had to modify the final code kindly provided by that thread's OP so it'd work with my ST7789 TFT, but the SD read problem was solved.

    Grateful to have found that.

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