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➜ Programming
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➜ Additions to your very useful uvga class
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Additions to your very useful uvga class
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| Posted by
| Dustintweir
(1 post) Bio
|
| Date
| Tue 11 Mar 2014 07:47 PM (UTC) |
| Message
| Thanks for the great library for operating my micro vga. I've been using mine to paint terminal screens compressed and stored in the Arduino's EEPROM. I've stored these "templates" as strings of ASCII codes starting at address 0 in the EEPROM, and ending with EOF character 034. This assumes the strings are in left-to-right, top-down order in the EEPROM up to the screen size of 2,000 characters.
To save memory, any time I have 4 or more identical characters to print I add character 021, followed by the repeat character, followed by the quantity of repeats. Finally I return the memory index of the first character after EOF, so I can re-call the function to read the next screen.
Used in sketches
int ROMScreen(int index)
{
byte buf, character; //incoming character and repeating character storage
int quantity; //number of character repeats
uvga.gotoxy(1,1);
do{
buf = EEPROM.read(index); //read current byte
if (buf == 21){ //indicates repeating character
index++;
character = EEPROM.read(index); //read the character to be repeated
index++;
quantity = EEPROM.read(index); //read the quantity of repeats
if (character==255) //special character to indicate "don't write anything"
uvga.advance(quantity);
else
for (int i=0; i<quantity; i++){
uvga.write(character);
}
}
else if (buf != 34){ //non-repeating but not EOF
if (buf == 255)
uvga.advance(1);
else
uvga.write(buf);
}
index++;
} while (buf != 34); //continue to read until EOF
return index;
}
Finally, I added a function to advance the cursor a number of places without moving the cursor to each place. This greatly speeds paint time
To uvga.h, line 93
To uvga.cpp, at the end of the file
void uVGA::advance (char i)
{
write (ESC "[");
write ((i / 100)+'0');
i = i-(i/100)*100;
write ((i / 10) + '0');
write ((i % 10) + '0');
write ('C');
}
| | Top |
|
| Posted by
| Fiendish
USA (2,555 posts) Bio
Global Moderator |
| Date
| Reply #1 on Tue 11 Mar 2014 11:13 PM (UTC) |
| Message
| |
https://github.com/fiendish/aardwolfclientpackage | | Top |
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