Hello,
I've been trying to get my Adafruit_RA8875 display working with custom fonts. I've managed to get the fonts working by updating to the latest RA8875 0.70 library. Unfortunately, the new library completely breaks all the colors. I'm assuming there is some setting I need to change in the library, but I don't really know where to start looking. Any help is appreciated! Hardware is a Teensy 3.6 and an Adafruit RA8875. Please note that the RA8875 runs all other example files with correct color.. It seems to be isolated specifically to the BMP image loading off of the flash card.
Here is an example of the picture working on the old library (but the fonts won't work). Notice the colors are correct:
Here is the exact same code with the same BMP image loaded:
Bonus, custom fonts working on the 0.70 library:
The code shown below remains the same and the only thing being switched here is the RA8875 library:
/*
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;
}