Hellow!
I started with Arduino and i have big problem with drawing bitmaps. The problem is not with "no work", but with the start to draw using tft.pushcolor(tft.color565(r,g,b));
it starts about the third row and about 20th column, what makes that right part of photo (about 20 px) i on the left side, and lastest row (3 px) tft.pushcolor put on the top of the screen (starts from origin 0,0).
I found that, the problem makes line " bmpFile.read(sdbuffer, sizeof(sdbuffer)); "
If I hide the line " tft.pushColor(tft.color565(r, g, b));" (get to comment), the lcd still draw time to time about 300 px (width of screen is 320px). The first px is black , and the rest are white. See photos in attachments.
Why does the bmpFile.read make any drawing? Can you explain and tell what should i do to draw correct BMP using this (First of all, i had to change #define BUFFPIXEL from 20 on 1. It is impossible to draw with value of 20.) :
#define BUFFPIXEL 1
"void bmpDraw(char *filename, int x, int 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 in buffer (R+G+B per pixel)
uint16_t lcdbuffer[BUFFPIXEL]; // pixel out buffer (16-bit 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();
uint8_t lcdidx = 0;
boolean first = true;
if((x >= tft.width()) || (y >= tft.height())) return;
Serial.println(); Serial.print("Loading image '"); Serial.print(filename); Serial.println(''');
if ((bmpFile = SD.open(filename)) == NULL) { Serial.print("File not found"); return; }
if(read16(bmpFile) == 0x4D42) { // BMP signature
progmemPrint(PSTR("File size: ")); Serial.println(read32(bmpFile));
(void)read32(bmpFile); // Read & ignore creator bytes
bmpImageoffset = read32(bmpFile); // Start of image data
progmemPrint(PSTR("Image Offset: ")); Serial.println(bmpImageoffset, DEC);
// Read DIB header
progmemPrint(PSTR("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
progmemPrint(PSTR("111111111111111111111Bit Depth: ")); Serial.println(bmpDepth);
if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed
goodBmp = true; // Supported BMP format -- proceed!
progmemPrint(PSTR("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 -1; //do poprawy bez minus 1 jak myślę
if((y+h-1) >= tft.height()) h = tft.height() - y -1;
Serial.print(w); Serial.print("x"); Serial.println(h);
tft.drawCircle(x, y, 1, 255);
tft.drawCircle(w, h, 4, 255); delay(1000);
tft.startWrite();
tft.setAddrWindow(x, y, w, h);
for (row = 0; row < h; row++) { // For each scanline...
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
/*if(lcdidx > 0) {
tft.pushColor(tft.color565(r,g,b)); Serial.print(lcdidx);
} */
Serial.println(" Zaladowane w");
Serial.print(millis() - startTime);
Serial.println(" ms");
} // end goodBmp
}
}
tft.endWrite();
bmpFile.close();
if(!goodBmp) progmemPrintln(PSTR("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;
}
// Copy string from flash to serial port
// Source string MUST be inside a PSTR() declaration!
void progmemPrint(const char *str) {
char c;
while(c = pgm_read_byte(str++)) Serial.print(c);
}
// Same as above, with trailing newline
void progmemPrintln(const char *str) {
progmemPrint(str);
Serial.println();}"
