Extremely slow speed when updating the display

[OmerFlame]

Hi, olikraus! I am having issues with the ST7735 using Ucglib. I am using my display to show values calculated from a lot of potentiometers and the values are very widely spread over the display (I am using the 160x128 display from Adafruit). For some reason, I am having very slow update speeds. I can give you my code and show you what I have been doing.

CODE ON THE MAIN LOOP:

for (int i = 0; i < 4; i++) {
    filters[i].setTextFrequency(String(map(filters[i].frequencyReading(), 0, 1023, 40, 800)));
    filters[i].setTextDB(String(mapFloat(filters[i].dbReading(), 0.0, 1023.0, -10.0, 10.0)));
    filters[i].setTextQ(String(map(filters[i].qReading(), 0, 1023, 0, 100)));
            
    filters[i].updateDigitpots(); // This function does not work on the hardware SPI bus, but on a separate software SPI bus and is completely unrelated to normal Ucglib operations.
}

CODE FOR setTextFrequency, setTextDB and setTextQ:

void Filter::setTextFrequency(String replacementText) {
    String modifiedReplacementText = replacementText;
    _displayHandler.setPrintPos(freqCursorX, freqCursorY);
    _displayHandler.setColor(0, _textColorR, _textColorG, _textColorB);
    
    switch (modifiedReplacementText.length()) {
        case 1:
            modifiedReplacementText = "00" + modifiedReplacementText;
            break;
    
        case 2:
            modifiedReplacementText = "0" + modifiedReplacementText;
            break;
    
        default:
            modifiedReplacementText = modifiedReplacementText;
            break;
    }
    
    if (shouldReadFromMemory) {
        setMemFrequency(atol(replacementText.c_str()));
    } else {
        setFrequency(atol(replacementText.c_str()));
    }
    
    _displayHandler.print(modifiedReplacementText);
}

void Filter::setTextDB(String replacementText) {
    String modifiedReplacementText = replacementText;
    _displayHandler.setPrintPos(dbCursorX, dbCursorY);
    _displayHandler.setColor(0, _textColorR, _textColorG, _textColorB);
    
    modifiedReplacementText.remove(replacementText.length() - 1);
    
    if (atof(modifiedReplacementText.c_str()) > 0) {
        modifiedReplacementText = "+" + modifiedReplacementText;
    }
    
    if (modifiedReplacementText == "+10.0") {
        modifiedReplacementText = "+10";
    }
    if (modifiedReplacementText == "-10.0") {
        modifiedReplacementText = "-10";
    }
    if (modifiedReplacementText == "+0.0" || modifiedReplacementText == "-0.0") {
        modifiedReplacementText = "+0.0";
    }
    
    if (shouldReadFromMemory) {
        setMemDB(atof(replacementText.c_str()));
    } else {
        setDB(atof(replacementText.c_str()));
    }
    
    _displayHandler.print(modifiedReplacementText);
    
    if (modifiedReplacementText.length() == 1) {
        _displayHandler.print("   ");
    }
    if (modifiedReplacementText.length() == 2) {
        _displayHandler.print("  ");
    }
    if (modifiedReplacementText.length() == 3) {
        _displayHandler.print(" ");
    }
}

void Filter::setTextQ(String replacementText) {
    String modifiedReplacementText = replacementText;
    _displayHandler.setPrintPos(qCursorX, qCursorY);
    _displayHandler.setColor(0, _textColorR, _textColorG, _textColorB);
    
    switch (modifiedReplacementText.length()) {
        case 1:
            modifiedReplacementText = "00" + modifiedReplacementText;
            break;
            
        case 2:
            modifiedReplacementText = "0" + modifiedReplacementText;
            break;
            
        default:
            break;
    }
    
    if (shouldReadFromMemory) {
        setMemQ(atoi(replacementText.c_str()));
    } else {
        setQ(atoi(replacementText.c_str()));
    }
    
    _displayHandler.print(modifiedReplacementText);
}

Note: _displayHandler is the UCG display controller.
Thank your for your time and your great library!

[EBTEAM3]

I am having the same issue, it was quite fast for a while, then suddenly slowed down. Did you end up finding a fix?