Hi All,
I have good experience in C++ programming and new to Aurdino programming and Electrinics. Recently purchased 7 inch TFT touch screen from https://www.buydisplay.com/serial-spi-arduino-7-inch-tft-lcd-touch-shield-ra8875-for-mega-due-uno with optional capacitive touch option. The display is compaitable with Arduino-mega, Arduino-Due and Arduino- UNO. I loaded CapacitivetouchTest sketch sample from buydisplay.com and it works fine.
Next I tried RA8875_Bitmap sample sketch. It compiles and uploads successfully. But the display is blank.
Please find the sketch below that I have tried.
#include <Adafruit_GFX.h> // Core graphics library
#include <SPI.h>
#include <Wire.h>
#include <SD.h>
#include "Adafruit_RA8875.h"
#include <Adafruit_STMPE610.h>
#define sd_cs 5 // 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 4
#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");
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()
{
}
#define BUFFPIXEL 20
void bmpDraw(const 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)) == false) {
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 < 0) {
bmpHeight = -bmpHeight;
flip = false;
}
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<h; row++) { // For each scanline...
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 column...
// Time to read more pixel data?
if (buffidx >= sizeof(sdbuffer)) { // Indeed
// Push LCD buffer to the display first
if(lcdidx > 0) {
tft.drawPixel(col+x, row+y, 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+x, row+y, lcdbuffer[lcdidx]);
} // end pixel
} // end scanline
// Write any remaining data to LCD
if(lcdidx > 0) {
tft.drawPixel(col+x, row+y, 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."));
}
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) );
}
Hope the following lines are the one I think I have to modify to make this sketch work.
#define sd_cs 5 // 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 4
#define RA8875_CS 10
#define RA8875_RESET 9
The Serial monitor displays the following:
11:04:04.927 -> initialization failed!
But I am not able to figure out. Also please let me know whether the SD card module present at back of TFT display is faulty or I have to wire up with connections to it make this sketch work? Any help would be appreciated.
Thanks in Advance.