Hello everyone, I am doing a summer project with a DLP printer and my problem is with tft 3,5 spi ili9844 like the one in this Link: http://www.lcdwiki.com/3.5inch_SPI_Module_ILI9488_SKU:MSP3520 I am handling it with An arduino nano as specified in the code and in the project specifications, although now I am with an arduino mega due to the low memory of the arduino nano, the screen works perfectly (the menus appear when I press the buttons) the SD reads it perfectly, but when it has to show the bmps that I have inserted in the SD nothing appears, it remains black, I have enabled some Serial.print that were in the code and added others to verify that I was seeing the image correctly, but the message always appears from "BMP format not recognized" I have tried to adjust the image to the active area of the screen as it says in the code, nothing, in what format to put it (16bits 656 -24bits 888), I don't know where to look or what to touch to that the images come out, some to help please
The .ino code that I use with the bmp are in this link https://github.com/sith31/Mlsa-mega
2. News 2, I have managed to get the data to appear correctly and the "BMP format not recognized" does not appear and the screen flickers when loading the image. What can it be, the rotation of the image, the active area is incorrectly positioned? According to the specifications of the screen, the 480x320 with an active area of 48.96x73.44MM, does the image have to be the same as the active area? I update the code used, (you have to clean it a bit) Thank you
1. News 1, I don't know if it is relevant or not, but playing a bit with the serial.print I have realized that "Header size:" only indicates 480, not 320. What appears on the serial monitor:
ILI9488 Msla!
EndStop no Press
Loading image '/Tower/1.bmp'
File Size: 460854
Image Offset: 40
Header size: 480
Bit Depth: 0
BMP format not recognized
[code]
////////////////////////////////////////////////////////////
// ***** FOR CUSTOMIZATION ****
// If you want to change the length of the linear guide, the threaded rod, the motor or the microsteps
// change them here and the rest of the variables will be updated.
#define Lguide 100 //Total length of linear guide (Default value : 100 mm)
#define pitch 2 //Pitch of movement screw thread (Default value : 2 mm)
#define stepsMotorPerRev 720 //Motor steps per revolution, including gear reduction (Default value : 720 steps/rev)
#define microsteps 1 //Driver microsteps (Default value 1)
////////////////////////////////////////////////////////////
// **** CONFIGURATION PARAMETERS ****
#define hUp 3 // Lift distance in mm (Default value: 3 mm)
int FirstLayers = 1; //Number of initial layers (Default value: 5 initial layers)
int expotime = 5; //Starting exposure time in seconds
int iexpotime = 10; //Starting initial exposure time in seconds
#define HighSpeed 1800 //Delay in microseconds of the stepper motor pulses; higher speed at lower value (Default = 1800 microseconds)
#define LowSpeed 2500 //Delay in microseconds of the stepper motor pulses; higher speed at lower value (Default = 2500 microseconds)
#define updowntime 7.3 //Printing downtime in seconds. Experimental value used to calculate print times. Counted from turning off the UV light on one layer and turning on the UV light on the next one.
//It must be modified if any of the configuration parameters are changed (speeds, number of initial layers, lift distance).
////////////////////////////////////////////////////////////
// Pin definition
#define PinDir 62
#define PinStep 64
#define PinEn 12
#define sclk 52
#define miso 50
#define mosi 51
#define tftcs 53
#define dc 45
#define rst 43
#define _sdcs 46
#define BtnUp 2
#define BtnDown 4
#define BtnOK 6
#define BtnCancel 8
#define PinEndStop 66
#define LightPin 83
///////////////////////////////////////////////
// ****LIBRARIES****
#include <Adafruit_GFX_AS.h>
#include <ILI9488.h> //FOR LCD DRIVER ILI9488
#include <SPI.h>
#include <EEPROM.h>
#include <SdFat.h>
SdFat SD;
//LCD TFT DRIVER
ILI9488 tft = ILI9488(tftcs, dc, rst); //FOR LCD DRIVER ILI9488
#define BU_BMP 1 // Temporarily flip the TFT coords for standard Bottom-Up bit maps
#define TD_BMP 0 // Draw inverted Top-Down bitmaps in standard coord frame
///////////////////////////////////////////////
// ****GLOBAL VARIABLES****
// **Screen number**
byte screen = 1;
// **Screen Menu**
int mainmenusel = 0;
int maxmainmenu = 2;
//**Button status**
bool edoBtnUP = HIGH;
bool edoBtnDOWN = HIGH;
bool edoBtnOK = HIGH;
bool edoBtnCANCEL = HIGH;
//**Button delay**
#define delaybutton 90
// **EndStop Lecture**
int LectEndStop = 0;
// **Layer Height**
float hLayer = 0.050;
int hLayerx1000 = hLayer * 1000;
// **Ascendant movement Height (mm)**
int maxheight = Lguide - 30; //(30 mm lost due to carriage and platform)
// **Print descendant movement**
float hDown = hUp - hLayer;
// **Steps per mm**
int StepsPerMm = stepsMotorPerRev * microsteps / pitch;
// **Calibration aditional steps**
#define maxAddDesc 3 // Additional maximum descent (Default = 3 mm)
int maxAddSteps = maxAddDesc * StepsPerMm / 8; //Division by 8 is due to memory EEPROM; then it is multiplied again.
byte stepsadditional = 0;
int stepsadditionalx8;
// **For the correct name of file**
String DirAndFile;
String FileName;
char *result = (char*)malloc(5);
int number;
//**For the layers counter**
int LayersCounter = 0;
int Layers;
String dirfoldersel;
// **For the folder´s name**
File root;
char foldersel[13];
int counter = 1;
// **Main menu title **
int screenWHalf;
int screenHHalf;
int screenW;
int screenH;
// **Main menu title **
String titlemainmenu[3] = {"Start Print", "Calibrate", "Setting Print"};
///////////////////////////////////////////////
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println("ILI9488 Msla!");
pinMode(_sdcs, OUTPUT);
pinMode (BtnUp, INPUT_PULLUP);
pinMode (BtnDown, INPUT_PULLUP);
pinMode (BtnCancel, INPUT_PULLUP);
pinMode (BtnOK, INPUT_PULLUP);
pinMode (PinDir, OUTPUT);
pinMode (PinStep, OUTPUT);
pinMode (PinEn, OUTPUT);
pinMode (LightPin, OUTPUT);
pinMode (PinEndStop, OUTPUT);
digitalWrite (LightPin, LOW);
digitalWrite (PinEn, HIGH);
if (!SD.begin(_sdcs, SPI_FULL_SPEED)) {
//return;
} else {
}
tft.begin(); //FOR LCD DRIVER ILI9488
tft.setRotation(1);
tft.setTextSize(2);
screenW = tft.width();
screenH = tft.height();
screenWHalf = (screenW/2);
screenHHalf = (screenH/2);
screen1();
}
void loop() {
// put your main code here, to run repeatedly:
edoBtnUP = digitalRead (BtnUp);
edoBtnDOWN = digitalRead (BtnDown);
edoBtnOK = digitalRead (BtnOK);
edoBtnCANCEL = digitalRead (BtnCancel);
//digitalWrite (LightPin, LOW);
//delay(5000);
//digitalWrite (LightPin, HIGH);
//delay(5000);
mainprint();
}
////////////////////////////////////////////////////////////
//***** MAIN FUNCTIONS *****
void mainprint() {
if (edoBtnUP == LOW) {
switch (screen) {
case 1:
mainmenunavi(1);
break;
case 11:
folderNavi(root, 0);
break;
case 12:
switch (hLayerx1000) {
case 50:
hLayer = 0.1;
hLayerx1000 = hLayer * 1000;
String hLayerString = String(hLayer);
char hLayerChar[7];
hLayerString.toCharArray(hLayerChar, 7);
tft.setTextColor(ILI9488_WHITE, ILI9488_BLACK);
tft.drawCentreString(hLayerChar, (screenWHalf)+1, 115, 2);
adjuststeps();
break;
}
delaybtn();
break;
case 13:
if (expotime >= 0 && screen == 13) {
expotime++;
updateSettingText(expotime);
}
iexpotime = 3 * expotime; // initial approximation
delaybtn();
break;
case 14:
if (FirstLayers > 2 && screen == 14) {
FirstLayers++;
updateSettingText(FirstLayers);
}
delaybtn();
break;
case 16:
if (iexpotime >= 0 && screen == 16) {
iexpotime++;
updateSettingText(iexpotime);
}
delaybtn();
break;
case 17:
stopprint();
delaybtn();
break;
case 21:
movasc(1, HighSpeed);
delaybtn();
break;
}
delaybtn();
}
if (edoBtnDOWN == LOW) {
switch (screen) {
case 1:
mainmenunavi(0);
break;
case 11:
folderNavi(root, 1);
break;
case 12:
switch (hLayerx1000) {
case 100:
hLayer = 0.05;
hLayerx1000 = hLayer * 1000;
String hLayerString = String(hLayer);
char hLayerChar[7];
hLayerString.toCharArray(hLayerChar, 7);
tft.setTextColor(ILI9488_WHITE, ILI9488_BLACK);
tft.drawCentreString(hLayerChar, (screenWHalf)+1, 115, 2);
adjuststeps();
break;
}
delaybtn();
break;
case 13:
if (expotime > 0 && screen == 13) {
expotime--;
updateSettingText(expotime);
}
iexpotime = 3 * expotime; // initial approximation
delaybtn();
break;
case 14:
if (FirstLayers > 2 && screen == 14) {
FirstLayers--;
updateSettingText(FirstLayers);
}
delaybtn();
break;
case 16:
if (iexpotime > 0 && screen == 16) {
iexpotime--;
updateSettingText(iexpotime);
}
delaybtn();
break;
case 21: //screen 21 is when the platform is down during calibration
if (stepsadditional <= maxAddSteps) {
stepsadditional++;
digitalWrite(PinDir, LOW);
digitalWrite (PinEn, LOW);
for (int z = 0; z < 8; z++) {
edoBtnCANCEL = digitalRead (BtnCancel);
digitalWrite(PinStep, HIGH);
digitalWrite(PinStep, LOW);
delayMicroseconds(LowSpeed);
}
digitalWrite (PinEn, HIGH);
}
break;
}
delaybtn();
}
if (edoBtnOK == LOW) {
switch (screen) {
case 1:
switch (mainmenusel) {
case 0:
screenOpenSDcard();
break;
case 1:
blackscreen();
tft.drawCentreString("Calibrate!", (screenWHalf), 120, 2);
calibrate();
screen = 21;
break;
case 2:
screen = 12;
screenSetting(1);
break;
}
break;
case 11:
contarlayers();
switch (hLayerx1000) {
case 50:
Layers = LayersCounter;
break;
case 100:
Layers = LayersCounter / 2;
int resto = Layers * 2;
resto = LayersCounter - resto;
if (resto > 0) {
Layers++;
}
break;
}
screen = 15;
screen15();
break;
case 12:
screen = 13;
screenSetting(2);
break;
case 13:
screen = 14;
screenSetting(3);
break;
case 14:
screen = 16;
screenSetting(4);
//screen = 1;
//screen1();
break;
case 15:
blackscreen();
startprint();
break;
case 16:
screen = 1;
screen1();
break;
}
delaybtn();
}
if (edoBtnCANCEL == LOW) {
if (screen < 17 && screen > 11 ) {
screen = 11;
screen11();
}
else {
screen = 1;
screen1();
}
delaybtn();
}
}
// PRINT FUNCTION
void stopprint(){
screen = 17;
screen17();
}
void startprint() {
number = 1;
buildfolder();
calibrate();
// Printing the first layers (with initial exposure time)
for (int l = 0; l < FirstLayers; l++) {
printname();
digitalWrite (LightPin, HIGH);
delayprint1();
delayprint1();
delayprint1();
delayprint1();
digitalWrite (LightPin, LOW);
blackscreen();
pause(); //allows to enter the pause function by holding down the ESC button
movasc(hUp, LowSpeed);
delay(200);
movdesc(hDown, LowSpeed);
}
// Printing the rest
for (int l = 0; l < Layers - FirstLayers; l++) {
printname();
digitalWrite (LightPin, HIGH);
delayprint2();
delayprint2();
delayprint2();
delayprint2();
digitalWrite (LightPin, LOW);
blackscreen();
pause(); //allows to enter the pause function by holding down the ESC button
movasc(hUp, LowSpeed);
delay(200);
movdesc(hDown, LowSpeed);
}
screen = 17;
screen17();
}
///////////////////////
// CALIBRATION FUNCTION
void calibrate() {
LectEndStop = digitalRead(PinEndStop);
if (LectEndStop != HIGH) {
desctoendstop();
delay(600);
stepsadditional = EEPROM.read(11);
stepsadditionalx8 = stepsadditional * 8;
digitalWrite (PinEn, LOW);
digitalWrite(PinDir, LOW);
for (int z = 0; z < stepsadditionalx8; z++) {
edoBtnCANCEL = digitalRead (BtnCancel);
digitalWrite(PinStep, HIGH);
digitalWrite(PinStep, LOW);
delayMicroseconds(LowSpeed);
if (edoBtnCANCEL == LOW) {
break;
}
}
digitalWrite (PinEn, HIGH);
}
}
/////////////////////////////////////////////////////////////
// CALIBRATION AND PRINT SUPPORT FUNCTIONS
void mainmenunavi(int isDown) {
if (isDown == 1) {
if (mainmenusel < 0) {
mainmenusel = maxmainmenu;
} else if (mainmenusel > 0) {
mainmenusel--;
}
} else {
if (mainmenusel > maxmainmenu) {
mainmenusel = 0;
} else if (mainmenusel < maxmainmenu) {
mainmenusel++;
}
}
//screen1();
readsdcard();
delaybtn();
}
void folderNavi(File dir, int isDown) {
if (isDown == 1) {
counter++;
} else if (isDown == 0) {
if (counter > 2) {
counter --;
} else {
return;
}
}
for (int i = 0; i < counter; i++) {
while (true) {
File entry = dir.openNextFile();
if (! entry) {
break;
}
if (entry.isDirectory()) {
entry.getName(foldersel, 13);
break;
}
entry.close();
}
}
tft.fillRect(screenWHalf-82, 130, 164, 36, ILI9488_BLACK);
tft.setTextColor(ILI9488_WHITE);
tft.drawCentreString(foldersel, (screenWHalf)+1, 134, 2);
delay(200);
delaybtn();
}
void movasc (float Mm, int delaysteps) {
long int stepsmotor = StepsPerMm * Mm;
digitalWrite (PinEn, LOW);
digitalWrite(PinDir, HIGH);
for (long int x = 0; x < stepsmotor; x++) {
edoBtnCANCEL = digitalRead (BtnCancel);
digitalWrite(PinStep, HIGH);
digitalWrite(PinStep, LOW);
delayMicroseconds(delaysteps);
}
digitalWrite (PinEn, HIGH);
}
void movdesc (float Mm, int delaysteps) {
long int stepsmotor = StepsPerMm * Mm;
digitalWrite (PinEn, LOW);
digitalWrite(PinDir, LOW);
for (long int x = 0; x < stepsmotor; x++) {
edoBtnCANCEL = digitalRead (BtnCancel);
digitalWrite(PinStep, HIGH);
digitalWrite(PinStep, LOW);
delayMicroseconds(delaysteps);
}
digitalWrite (PinEn, HIGH);
}
void buildfolder() {
DirAndFile = "";
String folderselString = String(foldersel);
String barra = "/";
DirAndFile += barra;
DirAndFile += folderselString;
DirAndFile += barra;
FileName = DirAndFile;
}
void contarlayers() {
LayersCounter = 0;
dirfoldersel = "";
String folderselString2 = String(foldersel);
number = 1;
dirfoldersel += "/";
dirfoldersel += folderselString2;
dirfoldersel += "/";
char dirfolderselChar[20];
dirfoldersel.toCharArray(dirfolderselChar, 20);
File dircarp = SD.open(dirfolderselChar);
while (true) {
File entry = dircarp.openNextFile();
if (! entry) {
break;
}
if (entry.isDirectory()) {
} else {
LayersCounter ++;
}
entry.close();
}
}
void delayprint1() {
delay (iexpotime * 250);
}
void delayprint2() {
delay (expotime * 250);
}
void printname() {
FileName += number;
FileName += ".bmp";
char NameChar[20];
FileName.toCharArray(NameChar, 20);
tft.setRotation(3);
drawBMP(NameChar, 0, 0, BU_BMP);
switch (hLayerx1000) {
case 50:
number ++;
break;
case 100:
number = number + 2;
break;
}
FileName = DirAndFile;
}
void pause() {
edoBtnOK = digitalRead (BtnOK);
edoBtnCANCEL = digitalRead (BtnCancel);
if (edoBtnCANCEL == LOW) {
float heightActual = number * 0.05;
float heightAdd = maxheight - heightActual;
movasc(heightAdd, HighSpeed);
while (digitalRead (BtnOK) != LOW) {
}
movdesc(heightAdd, HighSpeed);
delaybtn();
}
}
void desctoendstop() {
digitalWrite (PinEn, LOW);
digitalWrite(PinDir, LOW);
LectEndStop = digitalRead(PinEndStop);
Serial.println("EndStop no Press");
while (LectEndStop != HIGH) {
LectEndStop = digitalRead(PinEndStop);
edoBtnCANCEL = digitalRead (BtnCancel);
digitalWrite(PinStep, HIGH);
digitalWrite(PinStep, LOW);
delayMicroseconds(HighSpeed);
}
delay(300);
}
void delaybtn() {
delay(delaybutton);
}
void adjuststeps() {
hDown = hUp - hLayer;
}
////////////////////////////////////////////////////////////
// SCREENS
void screenOpenSDcard() {
EEPROM.write (11, stepsadditional);
//movasc(50, HighSpeed);
if (!SD.begin(_sdcs, SPI_FULL_SPEED)) {
digitalWrite (LightPin, LOW);
cleanscreen();
failedReadSDCard();
screen = 1;
}
else {
digitalWrite (LightPin, LOW);
root = SD.open("/");
screen11();
screen = 11;
}
}
void screen1() {
tft.setRotation(3);
tft.setTextSize(2);
cleanscreen();
//bannerprint();
readsdcard();
arrows();
}
void screen21() {
cleanscreen();
screen = 21;
}
void screen11() {
//bannerprint();
cleanscreen();
tft.setTextSize(2);
tft.setTextColor(ILI9488_WHITE);
tft.drawCentreString("SELECT FILE", (screenWHalf), 65, 2);
tft.drawCentreString(foldersel, (screenWHalf)+1, 134, 2);
tft.drawRect((screenWHalf)-85, 123, 170, 50, ILI9488_WHITE);
arrows();
}
void screenSetting(int page) {
cleanscreen();
tft.setTextSize(2);
tft.setTextColor(ILI9488_WHITE, ILI9488_BLACK);
if (page == 1) {
menuSettingTextSet("LAYER HEIGHT",hLayer,"mm");
} else if (page == 2) {
menuSettingTextSet("EXPOSURE TIME",expotime,"sec");
} else if (page == 3) {
menuSettingTextSet("INITIAL LAYER",FirstLayers,"layer");
}else if (page == 4) {
menuSettingTextSet("INITIAL EXPOSURE",iexpotime,"sec");
}
rectscreen();
arrows();
}
void menuSettingTextSet(char *title,int value,char *format){
tft.drawCentreString(title, (screenWHalf), 60, 2);
String valueString = String(value);
char valueChar[7];
valueString.toCharArray(valueChar, 7);
tft.drawCentreString(valueChar, (screenWHalf)+1, 115, 2);
tft.drawCentreString(format, (screenWHalf)+1, 160, 2);
}
void updateSettingText(int value){
String valueString = String(value);
char valueChar[7];
valueString.toCharArray(valueChar, 7);
cleantextscreen();
tft.setTextColor(ILI9488_WHITE);
tft.drawCentreString(valueChar, (screenWHalf)+1, 115, 2);
}
void screen15() {
long int timelayersinitial = FirstLayers * iexpotime;
long int quantitylayersresto = Layers - FirstLayers;
long int timerestodelayers = quantitylayersresto * expotime;
long int timesubebajatot = Layers * updowntime;
long int timetotalseg = timesubebajatot + timelayersinitial + timerestodelayers;
long int timetotalmin = timetotalseg / 60;
int timetotalhours = timetotalmin / 60;
int restominutes = timetotalmin - timetotalhours * 60;
cleanscreen();
tft.setTextSize(1);
tft.setTextColor(ILI9488_WHITE);
tft.drawCentreString("CONFIRMATION", (screenWHalf), 50, 2);
tft.drawString( "FOLDER : ", 20, 70, 2);
tft.drawString(foldersel, 110, 70, 2);
/*
tft.drawString("LAYER H.:", 20, 95, 2);
String hLayerString = String(hLayer);
char hLayerChar[7];
hLayerString.toCharArray(hLayerChar, 7);
tft.drawString(hLayerChar, 110, 95, 2);
tft.drawString("EXP. TIME:", 20, 120, 2);
String expotimeString = String(expotime);
char expotimeChar[7];
expotimeString.toCharArray(expotimeChar, 7);
tft.drawString(expotimeChar, 110,120, 2);
tft.drawString("INITIAL EXP.:", 20, 145, 2);
String iexpotimeString = String(iexpotime);
char iexpotimeChar[7];
iexpotimeString.toCharArray(iexpotimeChar, 7);
tft.drawString(iexpotimeChar, 110, 145, 2);*/
tft.drawString("TOTAL LAYERS :", 20, 95, 2);
String LayersString = String(Layers);
char LayersChar[7];
LayersString.toCharArray(LayersChar, 7);
tft.drawString(LayersChar, 130, 95, 2);
tft.drawString("DURATION :", 20, 120, 2);
String timetotalhoursString = String(timetotalhours);
char timetotalhoursChar[7];
timetotalhoursString.toCharArray(timetotalhoursChar, 7);
tft.drawCentreString(timetotalhoursChar, 130, 120, 2);
tft.drawString("h", 150, 120, 2);
String restominutesString = String(restominutes);
char restominutesChar[7];
restominutesString.toCharArray(restominutesChar, 7);
tft.drawCentreString(restominutesChar, 175, 120, 2);
tft.drawString("min", 195, 120, 2);
tft.setTextSize(2);
tft.drawCentreString("Insert tray and start!", (screenWHalf), 200, 2);
}
void screen16() {
}
void screen17() {
tft.setRotation(3);
blackscreen();
int heightup = Layers * hLayer;
int heightremain = maxheight - heightup;
movasc(heightremain, HighSpeed);
while (digitalRead (BtnCancel) != LOW) { //This is for led 13 to blink
blackscreen();
delay(100);
}
}
////////////////////////////////////////////////////////////
// SCREEN SUPPORT FUNCTIONS
//CHECK SD CARD AND SHOW SCREEN 1
void readsdcard() {
if (!SD.begin(_sdcs, SPI_FULL_SPEED)) {
failedReadSDCard();
}
else {
String titles = titlemainmenu[mainmenusel];
cleantextscreen();
switch (mainmenusel) {
case 0:
tft.drawCentreString("Start Print", screenWHalf, 130, 2);
break;
case 1:
tft.drawCentreString("Calibrate", screenWHalf, 130, 2);
break;
case 2:
tft.drawCentreString("Setting", screenWHalf, 130, 2);
break;
}
}
}
void failedReadSDCard(){
tft.drawCentreString("Please", (screenWHalf), 100, 2);
tft.drawCentreString("insert SD card", (screenWHalf), 135, 2);
}
void arrows() {
tft.fillTriangle(screenW-50, 135, screenW-30, 135, screenW-40, 120, ILI9488_WHITE ); //up arrow
tft.fillTriangle(screenW-50, 165, screenW-30, 165, screenW-40, 180, ILI9488_WHITE ); //down arrow
}
void rectscreen() {
tft.drawRect(screenWHalf-40, 110, 80, 40, ILI9488_WHITE);
}
void cleantextscreen() {
tft.fillRect(screenWHalf-75, 115, 150, 50, ILI9488_BLACK);
}
void blackscreen() {
tft.fillScreen(ILI9488_BLACK);
}
void cleanscreen() {
tft.fillRect(0, 0, screenW, screenH, ILI9488_BLACK);
}
/***************************************************************************************
** Function name: drawBMP
** Descriptions: draw a BMP format bitmap to the screen
***************************************************************************************/
// 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 makes loading a little faster but the law of
// rapidly diminishing speed improvements applies.
// Suggest 8 minimum and 85 maximum (3 x this value is
// stored in a byte = 255/3 max!)
// A value of 8 is only ~20% slower than 24 or 48!
// Note that 5 x this value of RAM bytes will be needed
// Increasing beyond 48 gives little benefit.
// Use integral division of TFT (or typical often used image)
// width for slightly better speed to avoid short buffer purging
#define BUFF_SIZE 80
void drawBMP(char *filename, int x, int y, boolean flip) {
if ((x >= screenW) || (y >= screenH)) return;
File bmpFile;
int16_t bmpWidth, bmpHeight; // Image W+H in pixels
uint8_t bmpDepth; // Bit depth (must be 24) but we dont use this
uint32_t bmpImageoffset; // Start address of image data in file
uint32_t rowSize; // Not always = bmpWidth; may have padding
uint8_t sdbuffer[3 * BUFF_SIZE]; // SD read pixel buffer (8 bits each R+G+B per pixel)
uint16_t tftbuffer[BUFF_SIZE]; // TFT pixel out buffer (16-bit per pixel)
uint8_t sd_ptr = sizeof(sdbuffer); // sdbuffer pointer (so BUFF_SIZE must be less than 86)
boolean goodBmp = false; // Flag set to true on valid header parse
int16_t w, h, row, col, x2, y2, bx1, by1; // to store width, height, row and column
//uint8_t r, g, b; // brg encoding line concatenated for speed so not used
uint8_t rotation; // to restore rotation
uint8_t tft_ptr = 0; // buffer pointer
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 file start signature check
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.
// Crop area to be loaded
w = bmpWidth;
h = bmpHeight;
}
// We might need to alter rotation to avoid tedious pointer manipulation
// Save the current value so we can restore it later
rotation = tft.getRotation();
// Use TFT SGRAM coord rotation if flip is set for 25% faster rendering
if (flip) tft.setRotation((rotation + (flip << 2)) % 8); // Value 0-3 mapped to 4-7
// We might need to flip and calculate new y plot coordinate
// relative to top left corner as well...
switch (rotation) {
case 0:
if (flip) y = screenH - y - h; break;
case 1:
y = screenH - y - h; break;
break;
case 2:
if (flip) y = screenH - y - h; break;
break;
case 3:
y = screenH - y - h; break;
break;
}
// Set TFT address window to image bounds
// Currently, image will not draw or will be corrputed if it does not fit
// TODO -> efficient clipping, I don't need it to be idiot proof ;-)
tft.setAddrWindow(x, y, x + w - 1, y + h - 1);
// Finally we are ready to send rows of pixels, writing like this avoids slow 32 bit multiply
for (uint32_t pos = bmpImageoffset; pos < bmpImageoffset + h * rowSize ; pos += rowSize) {
// Seek if we need to on boundaries and arrange to dump buffer and start again
if (bmpFile.position() != pos) {
bmpFile.seek(pos);
sd_ptr = sizeof(sdbuffer);
}
// Fill the pixel buffer and plot
for (col = 0; col < w; col++) { // For each column...
// Time to read more pixel data?
if (sd_ptr >= sizeof(sdbuffer)) {
// Push tft buffer to the display
if (tft_ptr) {
// Here we are sending a uint16_t array to the function
tft.pushColors(tftbuffer, tft_ptr);
tft_ptr = 0; // tft_ptr and sd_ptr are not always in sync...
}
// Finally reading bytes from SD Card
bmpFile.read(sdbuffer, sizeof(sdbuffer));
sd_ptr = 0; // Set buffer index to start
}
// Convert pixel from BMP 8+8+8 format to TFT compatible 16 bit word
// Blue 5 bits, green 6 bits and red 5 bits (16 bits total)
// Is is a long line but it is faster than calling a library fn for this
tftbuffer[tft_ptr++] = (sdbuffer[sd_ptr++] >> 3) | ((sdbuffer[sd_ptr++] & 0xFC) << 3) | ((sdbuffer[sd_ptr++] & 0xF8) << 8);
} // Next row
} // All rows done
// Write any partially full buffer to TFT
if (tft_ptr)tft.pushColors(tftbuffer, tft_ptr);
} // End of bitmap access
} // End of bitmap file check
//} // We can close the file now
bmpFile.close();
if(!goodBmp) Serial.println(F("BMP format not recognized."));
tft.setRotation(rotation); // Put back original rotation
}
/***************************************************************************************
** Function name: Support functions for drawBMP()
** Descriptions: 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;
}
[/code]