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THE BOOK of DT's INTERRUPTS is an organization of interrupt service routines and other works written by Darrel Taylor, RIP.

Interrupt routines are arranged per Darrel's original list. Darrel Taylor's Instant Interrupts are an extension of the work of Tim Box whom in October of 2002 wrote INT_CTRL.pbp

Many of the forum members felt this is a long overdue project.

THE BOOK of DT's INTERRUPTS
will be a valuable resource and a tribute to Darrel Taylor the "Fanatical Contributor".

THE BOOK of DT's INTERRUPTS is located at http://dt.picbasic.co.uk/

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  1. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Ordered 128x64 display from the different manufacturer.
    It has proper dimensions - the screen above is almost square, as you can see, and the new one has proper proportions.
    But it also has 20 pin...
  2. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Will post "Upgraded" version soon - it now supports individual attributes for all chars, like language, inversion, underline, striketrough. Working on variable width character support too.

    9246
  3. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Solved issue with writing to lower lines.
    These screens are actually divided into 64x32 blocks, which are addressed as 256x32, but physically located as
    AB
    CD
    So this is it.
  4. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Bought larger version, which has 128x64 pixels arrangement.
    But the issue is, that above code can write only to upper 32 lines of display.
    ...
  5. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Added "giant" size, 16x24 pixels font to the charset. But some letters need fine tuning. Once completed, will make this font .hex file free for everyone.

    9237
  6. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Yes, found some sample code for hardware I2C listed here. Reading thru them slowly....
  7. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    By the way, as PIC16F886 datasheet says:

    Master Synchronous Serial Port (MSSP) Module
    supporting 3-wire SPI (all 4 modes) and I2C
    Master and Slave Modes with I2C Address Mask

    This means, I...
  8. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    So only one way to get the speed, is to use SPI, but with MSSP?
  9. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Ok, measured I2C CLK speed. it is about 48khz. So I guess, this is the main issue, right?
  10. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Well, I don't see anything to be slow at 8mhz, except I2C :D
    Had no time today, will measure I2C frequency tomorrow and post back....
  11. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Not yet, but will do. Measure what, I2C clock frequency?
    Tried modifying code in a way, that only that part of screen is redrawn, which is being updated. For some uses it does helps, but not always.
  12. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Good.
    So I have to "learn" to use SPI eeprom 1st, and then use MSSP :)
    By the way, if I leave current setup as is - using I2C, but use PIC running at say 32mhz (instead of current 8mhz), will this...
  13. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Thanks, but that code is missing SSPBUF declaration?
  14. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Well I tried software SPI with MAX7219 and was not impressed at all - updating 32x8 pixels led display was quite slow....
  15. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    The main difference between us is the sourcing capabilities :)
    I'm buying everything from china, so I'm paying about 3 cents for 24C256 and parallel eeprom is somewhere around 40 cents. I guess, I...
  16. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    Thanks everyone.
    So let's answer step by step.
    There are no significant delays with ST7920 itself nor SPI should be used for it. I'm looking for best compatibility, and with LCDOUT it works like...
  17. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    24C256 is 32KB EEPROM.
    So I'm using it, because I need that much amount of font/graphics data :)
  18. Re: My "Library" for ST7920 Graphical displays, works fine, but...

    I'm using 24C256 for a good reason - due to amount of data being used :)
    Also, when using program memory, it won't be that easy to form the letters, as I do in the example above.
  19. My "Library" for ST7920 Graphical displays, works fine, but...

    Hello.
    There are LCD modules, based on ST7920 controller, which are pin and command compatible with HD44780 controllers, so they can be used with PBP, by using LCDOUT statement. This saves a lot of...
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