Custom characters for TFT display DFR0664
Mihai.Popa 2024-08-15 06:41:22 135 Views1 Replies Hello,
Could you, please, document the way and tools that can be used to create custom bitmap characters that will be displayed with DFRobot_GDL library?
I tried Gimp, Image2CCP and LCD assistand but the generated bitmap sequense is displayed wrong on this TFT.
Thank you, Mihai
In DFRobot_GDL library, section wiki/English, I fount this explanation:
void DFRobot_GDL::drawXBitmap(int16_t x, int16_t y, const uint8_t bitmap[],int16_t w, int16_t h, uint16_t color)
Description: drawXBitmap draw PROGMEM-resident XBitMap Files (*.xbm), exported from GIMP. Usage: Export from GIMP to *.xbm, rename *.xbm to *.c and open in the editor. C Array can be directly used with this function. There is no RAM-resident version of this function; if generating bitmaps in RAM, use the format defined by drawBitmap() and call that instead. Draw a monochrome bitmap at the specified x, y position (top left corner of the bitmap). Some parts of the bitmap may not be displayed within the display boundary. bitmap: bitmap array. w, h are the height and width of the bitmap; color 16-bit 5-6-5 to draw monochrome image with. Now, I used Gimp to generate the byte array, then I used the example from https://github.com/DFRobot/DFRobot_GDL/tree/master/examples/Basic/icon In file Icon.h I added the byte array generaded by Gimp and then I compile the skatch using Arduino IDE and FireBeetle 2 ESP32-C6 dev board (I used GDL port to comunicate with the TFT 240x320 DFR 0664).The result is the attached picture below:
This is the generated byte array, from Gimp:
//BLE icon;
const unsigned char gImage_17[128] PROGMEM= { /* 0X20,0X01,0X20,0X00,0X20,0X00, */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x80, 0x01, 0x00, 0x00, 0x80, 0x03, 0x00, 0x00, 0x80, 0x07, 0x00,
0xc0, 0x80, 0x0f, 0x00, 0xc0, 0x81, 0x1f, 0x00, 0x80, 0x83, 0x3d, 0x00,
0x00, 0x87, 0x79, 0x00, 0x00, 0x0e, 0x71, 0x00, 0x00, 0x1c, 0x38, 0x00,
0x00, 0x38, 0x1c, 0x00, 0x00, 0x70, 0x08, 0x00, 0x00, 0xe0, 0x00, 0x00,
0x00, 0xc0, 0x01, 0x00, 0x00, 0xc0, 0x03, 0x00, 0x00, 0xe0, 0x07, 0x00,
0x00, 0xf0, 0x0f, 0x00, 0x00, 0xf8, 0x1f, 0x00, 0x00, 0x9c, 0x39, 0x00,
0x00, 0x8e, 0x71, 0x00, 0x00, 0x87, 0xf9, 0x00, 0x80, 0x83, 0xfd, 0x01,
0x00, 0x81, 0x9f, 0x03, 0x00, 0x80, 0x0f, 0x03, 0x00, 0x80, 0x07, 0x00,
0x00, 0x80, 0x03, 0x00, 0x00, 0x80, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
This is the function from icon.ino:
screen.drawXBitmap(16, 200, gImage[17], 32, 32, 0xffff);
What should I do in this case? How I can generate the custon icons for this combination on TFT display and ESP32-C6?
Thank you,
Mihai
Mihai.Popa 
