Possible Examples for creating LCD in C? about vremulcd HOT 14 CLOSED

It works! Thank you so much, dude! Also, I assume you mean "LCD_CMD_DISPLAY_ON" instead of "LCD_DISPLAY_ON"

Nice one!

Yeah, that's what I meant (was on my phone).

Good luck with your project!

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As you've seen there are no formal C examples. The only place I'm personally using it is in my HBC-56 Emulator: https://github.com/visrealm/hbc-56/blob/master/emulator/src/devices/lcd_device.c Here, I'm rendering to an SDL texture.

The key steps are:

#define LCD_WIDTH 20
#define LCD_HEIGHT 4

VrEmuLcd      *lcd = vrEmuLcdNew(LCD_WIDTH, LCD_HEIGHT, EmuLcdRomA00);

// send it commands:
vrEmuLcdSendCommand(lcd, LCD_CMD_FUNCTION | LCD_CMD_FUNCTION_LCD_2LINE | 0x10);
vrEmuLcdSendCommand(lcd, LCD_CMD_CLEAR);
vrEmuLcdSendCommand(lcd, LCD_CMD_HOME);

// send it data
vrEmuLcdWriteByte(lcd, 'H');
vrEmuLcdWriteByte(lcd, 'e');
vrEmuLcdWriteByte(lcd, 'l');
vrEmuLcdWriteByte(lcd, 'l');
vrEmuLcdWriteByte(lcd, 'o');

// or cheat
vrEmuLcdWriteString(lcd, " world!");

// then periodically, render it. 
vrEmuLcdUpdatePixels(lcd);   // generates a snapshot of the pixels state

for (int y = 0; y < vrEmuLcdNumPixelsY(lcd); ++y) {
  for (int x = 0; x < vrEmuLcdNumPixelsX(lcd); ++x) {
    // do whatever you like with the pixel information. render it to a texture, output it to  a console, whatever
   // values returned are:  -1 = no pixel (character borders), 0 = pixel off, 1 = pixel on
    char pixel = vrEmuLcdPixelState(lcd, x, y);
  }
}

I'll consider adding a more minimal example.

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Hm. Just keeps on spitting errors at me, oddly enough.

Keeps on saying 'vrEmuLcd' isn't declared, which is quite odd...

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Are you able to share your code?

One possible issue could be the __declspec. If you're statically linking, you'll need to define VR_LCD_EMU_STATIC.

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Right here!
Pix80/Emu/pix80.c

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Replace

	// LCD init
	VrEmuLcd *lcd = vrEmuLcd.vrEmuLcdNew(LCD_WIDTH, LCD_HEIGHT, EmuLcdRomA00);

With

	// LCD init
	lcd = vrEmuLcdNew(LCD_WIDTH, LCD_HEIGHT, EmuLcdRomA00);
	

Also, if you're just compiling VrEmuLcd.c in to your project directly, as I mentioned previously, you'll need to add the

VR_LCD_EMU_STATIC=1

Preprocessor directive to your project. The reason for this is the way the functions are defined is different if you're compiling it as a dll.

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All I'm doing is including the vrEmuLcd.h file, the vrEmuLcd.c file nowhere to be found.
I've updated my code to be a little bit more detailed, and to explain the situation more clearly. Hope it helps.

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No worries. As I mentioned in the previous response, you need to fix that line. Replace the line with this

lcd = vrEmuLcdNew(LCD_WIDTH, LCD_HEIGHT, EmuLcdRomA00);

You already declared lcd in global scope near the top, so don't need to do it again. Also, vrEmuLcd.vrEmuLcdNew is incorrect. It's just vrEmuLcdNew.

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Right. But the issue with that is is the fact it then spits out
"tcc: error: undefined symbol 'vrEmuLcdNew'", reason I tried vrEmuLcd.vrEmuLcdNew instead

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Ok. I haven't used tcc before, so I downloaded it and gave it a try.

With this command-line:

tcc -DVR_LCD_EMU_STATIC=1 vrEmuLcd.c pix80.c

It compiles fine. However I had to make one change. For some reason, tcc wants a semi-colon here: vrEmuLcd.h:26

#undef byte
;
typedef unsigned char byte;

msvc, gcc and emscripten are all fine with out it, so not sure about that one.

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Awesome! It compiled!
Though it seems that every single pixel is a border pixel, even if I just use the example code you provided above.

It's progress none the less!

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vrEmuLcdSendCommand(lcd, LCD_CMD_DISPLAY | LCD_DISPLAY_ON);

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It works! Thank you so much, dude!
Also, I assume you mean "LCD_CMD_DISPLAY_ON" instead of "LCD_DISPLAY_ON"

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Thank you!

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