Project Details

Code:

int x=0; int y=0; int width=90; int height=100;
String text="HELLO"

int length = text.length();
for (int l = 0; l < length; l++)
{
tft.setWindow(x+(l*width), y, x+(l*width) + width - 1, y + height - 1);

uint32_t charpos = (text.charAt(l) - (int)61) * width * height * 3);

byte *startbyte= binarray+charpos; 
vspi->writeBytes((uint8_t*)startbyte, width * height * 3); 
}

Complete Code:

#include "FS.h"
//#include "SPIFFS.h"
#include <TFT_eSPI.h>
#include <SPI.h>

TFT_eSPI tft = TFT_eSPI();
 
#define SPI2_NSS_PIN 28
static const int spiClk = 40000000; // 1 MHz
//SPIClass * vspi = NULL;
 
int CS_PIN =5;
unsigned long bgstart = 675000UL;
void setup() {
  Serial.begin(115200);
  if (!SPIFFS.begin(true)) {
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }
  btStop();
 
 
  //vspi = new SPIClass(VSPI);
 SPI.begin();
 
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(1);  // landscape
 
  tft.fillScreen(TFT_BLACK);
  //Background
  bigImage(702000, 702000, 0, 0, 480, 320, 0xFFFFFF);
  //void DrawString( uint32_t check, int x, int y, int width, int height, String text, bool compare, bool transp,int asciioffset)
  DrawString(  0  , 0, 0, 90, 100, "HELLO", false, false, 65);
  DrawString(  0  , 0, 100, 90, 100, "ITS", false, false, 65);
  DrawString(  0  , 0, 200, 90, 100, "FUN", false, false, 65);
}
void loop() {
 
}
 
void DrawString( uint32_t check, int x, int y, int width, int height, String text, bool compare, bool transp, uint32_t asciioffset) {
  int lengthl = text.length();
  for (int l = 0; l < lengthl; l++)
  {
    uint32_t charpos = ((uint32_t)((uint32_t)text.charAt(l) - (uint32_t)asciioffset) * (uint32_t)width * height * 3);
 
    //void transparentImage(uint32_t startpic, uint32_t startbackground, int x, int y, int width, int height, uint32_t tcolor)
    transparentImage( check + charpos, 702000, x + ( l * width), y, width, height, 0xFFFFFF);
    Serial.println(charpos);
 
  }
}
 
void transparentImage(uint32_t startpic, uint32_t startbackground, int x, int y, int width, int height, uint32_t tcolor) {
  tft.setWindow(x, y, x + width - 1, y + height - 1);
  //read background clipping
  File f = SPIFFS.open( "/test.bin", "r");
  char *buf = (char*)malloc(width * height * 3);
  char *temp = (char*)malloc(width * 3);
  unsigned long offset = 0;
  for (int i = 0; i < height; i++) {
    // unsigned long offset = startbackground + (x * width*3 - (width*3 - (width-y*3)) + (i * width * 3));
    unsigned long offsetbg = startbackground + ((y + i) * 480 * 3 ) + (x * 3) ;
    f.seek(offsetbg, SeekSet);
    f.readBytes((char*)temp, width * 3) ;
    memcpy( buf + (i * width * 3), temp, (width * 3) );
 
  }
 
  for (int i = 0; i < height; i++) {
    unsigned long offset = startpic + i * width * 3;
    f.seek(offset, SeekSet);
    f.readBytes((char*)temp, width * 3) ;
    for (int h = 0; h < width * 3; h = h + 3)
    {
      uint32_t bp = temp[ h];
      bp = (bp << 8) | temp[h + 1];
      bp = (bp << 16) | temp[ h + 2];
      if (bp >= 0x111111 || y + i > 300) {
        buf[width * i * 3 + h] = temp[h];
        buf[width * i * 3 + h + 1] = temp[h + 1];
        buf[width * i * 3 + h + 2] = temp[h + 2];
      }
    }
  }
 
  SPI.beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
  digitalWrite(CS_PIN, LOW); //pull SS slow to prep other end for transfer
  SPI.writeBytes((uint8_t*)buf, width * height  * 3);
  digitalWrite(CS_PIN, HIGH); //pull ss high to signify end of data transfer
  SPI.endTransaction();
  f.close();
  Serial.println("test");
  free(buf);
  free(temp);
}
 
void bigImage(uint32_t startpic, uint32_t startbackground, int x, int y, int width, int height, uint32_t tcolor) {
  tft.setWindow(x, y, x + width - 1, y + height - 1);
  //read background clipping
  File f = SPIFFS.open( "/test.bin", "r");
  char *buf = (char*)malloc(width * height * 3);
  char *temp = (char*)malloc(width * 3);
  unsigned long offset = 0;
 SPI.beginTransaction(SPISettings(spiClk, MSBFIRST, SPI_MODE0));
  digitalWrite(CS_PIN, LOW); //pull SS slow to prep other end for transfer
  for (int i = 0; i < height; i++) {
    unsigned long offset = startbackground + (i * width * 3);
    f.seek(offset, SeekSet);
    f.readBytes((char*)temp, width * 3) ;
 
    SPI.writeBytes((uint8_t*)temp, width * 3);
  }
  digitalWrite(CS_PIN, HIGH); //pull ss high to signify end of data transfer
  SPI.endTransaction();
  f.close();
 
  free(buf);
  free(temp);
}