U8g2 for Adafruit GFX - Polish fonts #2120
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Fonts.. fonts... fonts... a lot of questions about fonts... Welcome! I'm new to programming on Arduino, so please, don't be raw. This is an only test code for biggest project, but I need to start from clean tests before go forward. #include <Adafruit_SSD1306.h> #define SCREEN_WIDTH 128 // OLED display width, in pixels int i; String j = "Elbląg. Łódź"; // string with PL chars void setup() { display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS); void loop() { display.clearDisplay(); To clarify, I know that included libs not allow to read chars over 127, or even if can up to 256, according to ASCII table, PL chars starting at 260 position. I actually create two PL fonts based on FreeSans. First got chars in-line with "true" ASCII (over 256), second (used in this sketch) got PL fonts between 0-32 ASCII table. Second font works fine, until you call char by ASCII code, but in my project, string will be loaded from SD card - txt file, where people will use raw polish fonts. My idea was to read string and replace letters like "ąćęłńóśżź" with ASCII code form table using replace() command to display it on OLED. I'm stuck here. Replace command don't allow to use ASCII code, just simple "ą", "a". Any idea how to solve it? |
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Replies: 2 comments 4 replies
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Things are mixed in your code. This is the issue tracker for u8g2. However your code uses Adafruit lib: So better ask the Adafruit people for support. In general, your problem could be solved without problems by using "u8g2lib.h"
The following example will use the built-in font helvR14, see https://github.com/olikraus/u8g2/wiki/fntgrpadobex11#helvr14 Again: By using u8g2 you can just use any none-ASCII chars directly in the code as shown in the example below. void setup(void) {
u8g2.begin();
u8g2.enableUTF8Print(); // enable UTF8 support for the Arduino print() function
}
void loop(void) {
u8g2.setFont(u8g2_font_helvR14_te);
u8g2.setFontDirection(0);
u8g2.firstPage();
do {
u8g2.setCursor(0, 15);
u8g2.print("Hello World!");
u8g2.setCursor(0, 40);
u8g2.print("ąćęłńóśżź");
} while ( u8g2.nextPage() );
delay(1000);
} |
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Hi Olikarus, thanks for the answer, but the problem is, that I was testing u8g2 library earlier, and this lib is not allowing to load long text to OLED memory and scroll it using cursor position with 'for' command. I saw that you have solution for scrolling text, however it's not so "easy" and "nice" on display. Working more slowly than u8g2_for_adafruit_gfx, and it's flickering due to swapping pages. |
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u8g2 usually does not flicker. If so, then let me look into your code. Flicker can be fully avoided with u8g2. Lines 163 to 169 in 3d41860 |
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I did it few days ago. Take a look at this code. #include <U8g2lib.h>
U8G2_SSD1306_128X32_UNIVISION_F_SW_I2C u8g2(U8G2_R0, /* clock=*/SCL, /* data=*/SDA, /* reset=*/U8X8_PIN_NONE);
u8g2_uint_t offset; // current offset for the scrolling text
u8g2_uint_t width; // pixel width of the scrolling text (must be lesser than 128 unless U8G2_16BIT is defined
const char *text = "Elbląg 12:48 - Gronowo Elbląskie 12:56 - Fiszewo 12:59 - Stare Pole 13:03 - Królewo Malborskie 13:08 - Malbork 13:13 - Malbork Kałdowo 13:24 - Stogi Malborskie 13:27 - Szymankowo 13:31 - Lisewo 13:36 - Tczew 13:40 - Miłobądz 13:48 - Pszczółki 13:51 - Skowarcz 13:53 - Różyny 13:56 - Cieplewo 13:59 - Pruszcz Gdański 14:02 - Gdańsk Lipce 14:06 - Gdańsk Orunia 14:09 - Gdańsk Główny 14:13"; // scroll this text from right to left
void setup(void) {
u8g2.begin();
u8g2.setFont(u8g2_font_unifont_t_polish); // set the target font to calculate the pixel width
width = u8g2.getUTF8Width(text); // calculate the pixel width of the text
u8g2.setFontMode(0); // enable transparent mode, which is faster
}
void loop(void) {
u8g2_uint_t x;
u8g2.firstPage();
do {
// draw the scrolling text at current offset
x = offset;
u8g2.setFont(u8g2_font_unifont_t_polish); // set the target font
do { // repeated drawing of the scrolling text...
u8g2.drawUTF8(x, 30, text); // draw the scolling text
x += width; // add the pixel width of the scrolling text
} while( x < u8g2.getDisplayWidth() ); // draw again until the complete display is filled
u8g2.setFont(u8g2_font_unifont_t_polish); // draw the current pixel width
u8g2.setCursor(127, 30);
u8g2.print(width); // this value must be lesser than 128 unless U8G2_16BIT is set
} while ( u8g2.nextPage() );
offset-=1; // scroll by one pixel
if ( (u8g2_uint_t)offset < (u8g2_uint_t)-width )
offset = 0; // start over again
}It's working, but very slow, I can see 'flickering' OLED (you mentioned about that somwhere ). By flickering I mind latency between switching pages. It's not smooth scroll. And I can't use my own created font. To be clear, I'm using Wemos D1 board with ESP8266MOD chip. |
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You probably need to use the HW_I2C constructor: or |
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Wow! const uint8_t FreeMono12pt7bPLBitmaps[] PROGMEM = { const GFXglyph FreeMono12pt7bPLGlyphs[] PROGMEM = { const GFXfont FreeMono12pt7bPL PROGMEM = {(uint8_t *)FreeMono12pt7bPLBitmaps, // Approx. 2132 bytes |
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Things are mixed in your code. This is the issue tracker for u8g2. However your code uses Adafruit lib: So better ask the Adafruit people for support.
In general, your problem could be solved without problems by using "u8g2lib.h"
The following example will use the built-in font helvR14, see https://github.com/olikraus/u8g2/wiki/fntgrpadobex11#helvr14
Again: By using u8g2 you can just use any none-ASCII chars directly in the code as shown in the example below.