Hi guys, I am using the UNO shield, and I am trying to display a image on screen. It is a 2.2" screen. The serial monitor says it is ok with the SD, and it displays messages that it is showing it on screen, but the screen is always White.
Any help?
(the screen Works actually with the graphics examples).
#include <Adafruit_GFX.h> // Core graphics library
#include <Adafruit_ILI9341.h> // Hardware-specific library
#include <SPI.h>
#include <SD.h>
// TFT display and SD card will share the hardware SPI interface.
// Hardware SPI pins are specific to the Arduino board type and
// cannot be remapped to alternate pins. For Arduino Uno,
// Duemilanove, etc., pin 11 = MOSI, pin 12 = MISO, pin 13 = SCK.
#define TFT_DC 9
#define TFT_CS 10
#define TFT_RST 8
#define TFT_MOSI 11
#define TFT_MISO 12
#define TFT_CLK 13
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);
//Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
#define SD_CS 4
void setup(void) {
Serial.begin(9600);
tft.begin();
yield();
Serial.print("Initializing SD card...");
if (!SD.begin(SD_CS)) {
Serial.println("failed!");
}
else{
Serial.println("OK!");
}
}
void loop() {
for(uint8_t r=0; r<4; r++) {
tft.setRotation(r);
tft.fillScreen(ILI9341_BLUE);
for(int8_t i=-2; i<1; i++) {
delay(5000);
bmpDraw("purple.bmp",
(tft.width() / 2) + (i * 120),
(tft.height() / 2) + (i * 160));
}
}
}
// 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, int16_t x, int16_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, x2, y2, bx1, by1;
uint8_t r, g, b;
uint32_t pos = 0, startTime = millis();
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.print(F("File not found"));
return;
}
// Parse BMP header
if(read16(bmpFile) == 0x4D42) { // BMP signature
Serial.print(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
x2 = x + bmpWidth - 1; // Lower-right corner
y2 = y + bmpHeight - 1;
if((x2 >= 0) && (y2 >= 0)) { // On screen?
w = bmpWidth; // Width/height of section to load/display
h = bmpHeight;
bx1 = by1 = 0; // UL coordinate in BMP file
if(x < 0) { // Clip left
bx1 = -x;
x = 0;
w = x2 + 1;
}
if(y < 0) { // Clip top
by1 = -y;
y = 0;
h = y2 + 1;
}
if(x2 >= tft.width()) w = tft.width() - x; // Clip right
if(y2 >= tft.height()) h = tft.height() - y; // Clip bottom
// Set TFT address window to clipped image bounds
tft.startWrite(); // Requires start/end transaction now
tft.setAddrWindow(x, y, w, h);
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 + by1)) * rowSize;
else // Bitmap is stored top-to-bottom
pos = bmpImageoffset + (row + by1) * rowSize;
pos += bx1 * 3; // Factor in starting column (bx1)
if(bmpFile.position() != pos) { // Need seek?
tft.endWrite(); // End TFT transaction
bmpFile.seek(pos);
buffidx = sizeof(sdbuffer); // Force buffer reload
tft.startWrite(); // Start new TFT transaction
}
for (col=0; col<w; col++) { // For each pixel...
// Time to read more pixel data?
if (buffidx >= sizeof(sdbuffer)) { // Indeed
tft.endWrite(); // End TFT transaction
bmpFile.read(sdbuffer, sizeof(sdbuffer));
buffidx = 0; // Set index to beginning
tft.startWrite(); // Start new TFT transaction
}
// Convert pixel from BMP to TFT format, push to display
b = sdbuffer[buffidx++];
g = sdbuffer[buffidx++];
r = sdbuffer[buffidx++];
tft.writePixel(tft.color565(r,g,b));
} // end pixel
} // end scanline
tft.endWrite(); // End last TFT transaction
} // end onscreen
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;
}