Quelle: https://github.com/prenticedavid/MCUFRIEND_kbv/tree/master/examples/showBMP_kbv_Uno
Benötigte Bibliothek
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 | #include <SD.h> // Use the official SD library on hardware pins #include <Adafruit_GFX.h> // Hardware-specific library #include <MCUFRIEND_kbv.h> MCUFRIEND_kbv tft; #define SD_CS 10 #define NAMEMATCH “” // “” matches any name #define PALETTEDEPTH 0 // do not support Palette modes char namebuf[32] = “/”; //BMP files in root directory File root; int pathlen; void setup() { uint16_t ID; Serial.begin(9600); Serial.print(“Show BMP files on TFT with ID:0x”); ID = tft.readID(); Serial.println(ID, HEX); if (ID == 0x0D3D3) ID = 0x9481; tft.begin(ID); tft.setRotation(1); tft.fillScreen(0x001F); tft.setTextColor(0xFFFF, 0x0000); bool good = SD.begin(SD_CS); if (!good) { Serial.print(F(“cannot start SD”)); while (1); } root = SD.open(namebuf); pathlen = strlen(namebuf); } void loop() { char* nm = namebuf + pathlen; File f = root.openNextFile(); uint8_t ret; uint32_t start; if (f != NULL) { #ifdef USE_SDFAT f.getName(nm, 32 - pathlen); #else strcpy(nm, (char *)f.name()); #endif f.close(); strlwr(nm); if (strstr(nm, “.bmp”) != NULL && strstr(nm, NAMEMATCH) != NULL) { Serial.print(namebuf); Serial.print(F(“ — ”)); tft.fillScreen(0); start = millis(); ret = showBMP(namebuf, 5, 5); switch (ret) { case 0: Serial.print(millis() - start); Serial.println(F(“ms”)); delay(5000); break; case 1: Serial.println(F(“bad position”)); break; case 2: Serial.println(F(“bad BMP ID”)); break; case 3: Serial.println(F(“wrong number of planes”)); break; case 4: Serial.println(F(“unsupported BMP format”)); break; case 5: Serial.println(F(“unsupported palette”)); break; default: Serial.println(F(“unknown”)); break; } } } else root.rewindDirectory(); } #define BMPIMAGEOFFSET 54 #define BUFFPIXEL 20 uint16_t read16(File& f) { uint16_t result; // read little-endian f.read((uint8_t*)&result, sizeof(result)); return result; } uint32_t read32(File& f) { uint32_t result; f.read((uint8_t*)&result, sizeof(result)); return result; } uint8_t showBMP(char* nm, int x, int y) { File bmpFile; int bmpWidth, bmpHeight; // W+H in pixels uint8_t bmpDepth; // Bit depth (currently must be 24, 16, 8, 4, 1) 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[(1 « 0) + BUFFPIXEL], *palette = NULL; uint8_t bitmask, bitshift; boolean flip = true; // BMP is stored bottom-to-top int w, h, row, col, lcdbufsiz = (1 « 0) + BUFFPIXEL, buffidx; uint32_t pos; // seek position boolean is565 = false; // uint16_t bmpID; uint16_t n; // blocks read uint8_t ret; if ((x >= tft.width()) || (y >= tft.height())) return 1; // off screen bmpFile = SD.open(nm); // Parse BMP header bmpID = read16(bmpFile); // BMP signature (void)read32(bmpFile); // Read & ignore file size (void)read32(bmpFile); // Read & ignore creator bytes bmpImageoffset = read32(bmpFile); // Start of image data (void)read32(bmpFile); // Read & ignore DIB header size bmpWidth = read32(bmpFile); bmpHeight = read32(bmpFile); n = read16(bmpFile); // # planes — must be ‘1’ bmpDepth = read16(bmpFile); // bits per pixel pos = read32(bmpFile); // format if (bmpID != 0x4D42) ret = 2; // bad ID else if (n != 1) ret = 3; // too many planes else if (pos != 0 && pos != 3) ret = 4; // format: 0 = uncompressed, 3 = 565 else if (bmpDepth < 16 && bmpDepth > PALETTEDEPTH) ret = 5; // palette else { bool first = true; is565 = (pos == 3); // ?already in 16-bit format // BMP rows are padded (if needed) to 4‑byte boundary rowSize = (bmpWidth * bmpDepth / 8 + 3) & ~3; if (bmpHeight < 0) { // If negative, image is in top-down order. bmpHeight = -bmpHeight; flip = false; } w = bmpWidth; h = bmpHeight; if ((x + w) >= tft.width()) // Crop area to be loaded w = tft.width() - x; if ((y + h) >= tft.height()) // h = tft.height() - y; if (bmpDepth <= PALETTEDEPTH) { // these modes have separate palette //bmpFile.seek(BMPIMAGEOFFSET); //palette is always @ 54 bmpFile.seek(bmpImageoffset - (4 « bmpDepth)); //54 for regular, diff for colorsimportant bitmask = 0xFF; if (bmpDepth < 8) bitmask »= bmpDepth; bitshift = 8 - bmpDepth; n = 1 « bmpDepth; lcdbufsiz -= n; palette = lcdbuffer + lcdbufsiz; for (col = 0; col < n; col++) { pos = read32(bmpFile); //map palette to 5–6‑5 palette[col] = ((pos & 0x0000F8) » 3) | ((pos & 0x00FC00) » 5) | ((pos & 0xF80000) » 8); } } // 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). uint8_t r, g, b, *sdptr; int lcdidx, lcdleft; 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;) { //pixels in row lcdleft = w - col; if (lcdleft > lcdbufsiz) lcdleft = lcdbufsiz; for (lcdidx = 0; lcdidx < lcdleft; lcdidx++) { // buffer at a time uint16_t color; // Time to read more pixel data? if (buffidx >= sizeof(sdbuffer)) { // Indeed bmpFile.read(sdbuffer, sizeof(sdbuffer)); buffidx = 0; // Set index to beginning r = 0; } switch (bmpDepth) { // Convert pixel from BMP to TFT format case 32: case 24: b = sdbuffer[buffidx++]; g = sdbuffer[buffidx++]; r = sdbuffer[buffidx++]; if (bmpDepth == 32) buffidx++; //ignore ALPHA color = tft.color565(r, g, b); break; case 16: b = sdbuffer[buffidx++]; r = sdbuffer[buffidx++]; if (is565) color = (r « 8) | (b); else color = (r « 9) | ((b & 0xE0) « 1) | (b & 0x1F); break; case 1: case 4: case 8: if (r == 0) b = sdbuffer[buffidx++], r = 8; color = palette[(b » bitshift) & bitmask]; r -= bmpDepth; b «= bmpDepth; break; } lcdbuffer[lcdidx] = color; } tft.pushColors(lcdbuffer, lcdidx, first); first = false; col += lcdidx; } // end cols } // end rows tft.setAddrWindow(0, 0, tft.width() - 1, tft.height() - 1); // restore full screen ret = 0; // good render } bmpFile.close(); return (ret); } |