diff --git a/examples/parrot.bmp b/examples/parrot.bmp new file mode 100644 index 0000000..a98c4eb Binary files /dev/null and b/examples/parrot.bmp differ diff --git a/examples/ra8875_bitmap/ra8875_bitmap.ino b/examples/ra8875_bitmap/ra8875_bitmap.ino new file mode 100644 index 0000000..c2e9076 --- /dev/null +++ b/examples/ra8875_bitmap/ra8875_bitmap.ino @@ -0,0 +1,232 @@ + + +#include // Core graphics library +#include +#include +#include +#include "Adafruit_RA8875.h" +#include +#define sd_cs 6 // uding ethernet shield sd + +// Library only supports hardware SPI at this time +// Connect SCLK to UNO Digital #13 (Hardware SPI clock) +// Connect MISO to UNO Digital #12 (Hardware SPI MISO) +// Connect MOSI to UNO Digital #11 (Hardware SPI MOSI) +#define RA8875_INT 3 +#define RA8875_CS 10 +#define RA8875_RESET 9 + +Adafruit_RA8875 tft = Adafruit_RA8875(RA8875_CS, RA8875_RESET); + +void setup () { + Serial.begin(9600); + + if (!SD.begin(sd_cs)) + { + Serial.println("initialization failed!"); + return; + } + + Serial.println("initialization done."); + + Serial.println("RA8875 start"); + + /* Initialise the display using 'RA8875_480x272' or 'RA8875_800x480' */ + if (!tft.begin(RA8875_800x480)) { + Serial.println("RA8875 Not Found!"); + while (1); + } + + Serial.println("Found RA8875"); + + tft.displayOn(true); + tft.GPIOX(true); // Enable TFT - display enable tied to GPIOX + tft.PWM1config(true, RA8875_PWM_CLK_DIV1024); // PWM output for backlight + tft.PWM1out(255); + + Serial.print("("); + Serial.print(tft.width()); + Serial.print(", "); + Serial.print(tft.height()); + Serial.println(")"); + tft.graphicsMode(); // go back to graphics mode + tft.fillScreen(RA8875_BLACK); + tft.graphicsMode(); + bmpDraw("parrot.bmp", 0, 0); +} + +void loop() +{ +} + +// This function opens a Windows Bitmap (BMP) file and +// displays it at the given coordinates. It's sped up +// by reading many pixels worth of data at a time +// (rather than pixel by pixel). Increasing the buffer +// size takes more of the Arduino's precious RAM but +// makes loading a little faster. 20 pixels seems a +// good balance. + +#define BUFFPIXEL 20 + +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(F("Loading image '")); + Serial.print(filename); + Serial.println('\''); + + // Open requested file on SD card + if ((bmpFile = SD.open(filename)) == NULL) { + Serial.println(F("File not found")); + return; + } + + // Parse BMP header + if(read16(bmpFile) == 0x4D42) { // BMP signature + Serial.println(F("File size: ")); + Serial.println(read32(bmpFile)); + (void)read32(bmpFile); // Read & ignore creator bytes + bmpImageoffset = read32(bmpFile); // Start of image data + Serial.print(F("Image Offset: ")); + Serial.println(bmpImageoffset, DEC); + + // Read DIB header + Serial.print(F("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(F("Bit Depth: ")); + Serial.println(bmpDepth); + if((bmpDepth == 24) && (read32(bmpFile) == 0)) { // 0 = uncompressed + goodBmp = true; // Supported BMP format -- proceed! + Serial.print(F("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 + + for (row=0; row= sizeof(sdbuffer)) { // Indeed + // Push LCD buffer to the display first + if(lcdidx > 0) { + tft.drawPixel(col, row, lcdbuffer[lcdidx]); + lcdidx = 0; + first = false; + } + + bmpFile.read(sdbuffer, sizeof(sdbuffer)); + buffidx = 0; // Set index to beginning + } + + // Convert pixel from BMP to TFT format + b = sdbuffer[buffidx++]; + g = sdbuffer[buffidx++]; + r = sdbuffer[buffidx++]; + lcdbuffer[lcdidx] = color565(r,g,b); + tft.drawPixel(col, row, lcdbuffer[lcdidx]); + } // end pixel + + } // end scanline + + // Write any remaining data to LCD + if(lcdidx > 0) { + tft.drawPixel(col, row, lcdbuffer[lcdidx]); + } + + Serial.print(F("Loaded in ")); + Serial.print(millis() - startTime); + Serial.println(" ms"); + + } // end goodBmp + } + } + + bmpFile.close(); + if(!goodBmp) Serial.println(F("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; +} + +uint16_t color565(uint8_t r, uint8_t g, uint8_t b) { + return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3); +} + +byte decToBcd(byte val){ + // Convert normal decimal numbers to binary coded decimal + return ( (val/10*16) + (val%10) ); +} +