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- For writing any data to MCU (splash screen, user fonts…): If didn’t use the latest Digole’s Arduino or C library, please erase the memory by using regular “FLMER”(flash memory erase) command and wait the erasing completed (usually delay(1000) to wait 1second) prior to write data.
- 4.3” large display module alway use 2 bytes integrated format as position(Producted before Jul-7th 2023). use:
#define _Screen_Over_511_
if using Arduino Library.
The firmware after Jul-7th 2023, use this compatible codes to send x/y position that value over 495 (this way makes it compatible with all older Digole serial displays,see the top of page)
For All firmware version higher than V7.0(with flash chip) and V6.2(without flash chip):
In order to backward compatible with small matrix of screens, the graphic coordinate and line length, circle ratio should be sent to display like this:
<=254 , 1 byte format
>=255 and <495, 2 bytes format, first byte always 255, 2nd byte is (value-255)
>=495, 3 bytes format, 1st byte always 255, 2nd byte is (240+(int)value/256), 3rd byte is (value%256)
The maximum value will be (255-240)*256+255=4095.
Here is the example of C code:
void write(byte data); //send a byte of data to communication port:UART,I2C or SPI)
void write2B(unsigned int v) { //for all screen include 4.3"
if (v < 255) //<=254
write(v);
else { //>=255
write(255);
if((v-255)<240) //>=255 and <495
write(v - 255);
else //>=495
{
write(240+(int)(v/256));
write(v%256);
}
}
}
For display without flash chip(V6.0,V6.1 only):
Download links:
Arduino C libarary V7 (Aug 10th 2023, Fixed ESP8266 I2C read1() bug)