/*
Grab bmp image from an sd card.
It reads column by column and send each RA instead of pixels
Look inside the folder RA8875/examples/SDTest_800x480
there's a folder, copy the content in a formatted FAT32 SD card
Note: Fixed the garbage introduced with Teensy3 optimized SD library
You can use USE_TEENSY3_OPTIMIZED_CODE now.
*/
#include <SPI.h>
#include <RA8875.h>
#include <SD.h>
/*
Teensy3.x
You are using 4 wire SPI here, so:
MOSI: 11//Teensy3.x
MISO: 12//Teensy3.x
SCK: 13//Teensy3.x
the rest of pin below:
*/
#define SDCSPIN BUILTIN_SDCARD//for SD
#define RA8875_CS 10 //see below...
/*
Teensy 3.x can use: 2,6,9,10,15,20,21,22,23
*/
#define RA8875_RESET 9//any pin or nothing!
#if defined USE_TEENSY3_OPTIMIZED_CODE
#define BUFFPIXEL 120//do not change this! It's a workaround to SD caching artifact introduced in SD optimized
#else
#define BUFFPIXEL 20//I've experiment a little with this but not so many differences
#endif
//instances
RA8875 tft = RA8875(RA8875_CS, RA8875_RESET); //Teensy3/arduino's
File bmpFile;
void setup()
{
Serial.begin(38400);
long unsigned debug_start = millis ();
while (!Serial && ((millis () - debug_start) <= 5000)) ;
Serial.println("RA8875 start");
tft.begin(Adafruit_800x480);
if (!SD.begin(SDCSPIN)) {
Serial.println("SD failed!");
return;
}
Serial.println("OK!");
bmpDraw("jeep.bmp", 0, 0);//copy the enclosed image in a SD card (check the folder!!!)
}
void loop()
{
}
void bmpDraw(const char *filename, uint16_t x, uint16_t y) {
uint16_t 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)
uint16_t buffidx = 0;
boolean goodBmp = false; // Set to true on valid header parse
boolean flip = true; // BMP is stored bottom-to-top
int16_t w, h, row, col;
uint32_t pos = 0, startTime = millis();
buffidx = sizeof(sdbuffer);// Current position in sdbuffer
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
if ((bmpFile = SD.open(filename)) == 0) {
Serial.print("File not found");
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;
uint16_t rowBuffer[w];
if (((w - 1)+x) >= tft.width()) w = tft.width() - x;
if (((h - 1)+y) >= tft.height()) h = tft.height() - y;
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
}
rowBuffer[col] = tft.Color565(sdbuffer[buffidx++], sdbuffer[buffidx++], sdbuffer[buffidx++]);
} // end pixel
tft.drawPixels(rowBuffer, w, x, y + row);
} // 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.");
} else {
Serial.println("end...");
}
}
// 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.
void writePixb(int16_t x, uint16_t color) {
tft.setX(x);
tft.writeCommand(RA8875_MRWC);
tft.writeData16(color);
}
uint16_t read16(File &f) {
uint16_t result = 0;
((uint8_t *)&result)[0] = f.read(); // LSB
((uint8_t *)&result)[1] = f.read(); // MSB
return result;
}
uint32_t read32(File &f) {
uint32_t result = 0;
((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;
}