Driver for ILI9341 - Page 4


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Thread: Driver for ILI9341539 days old

  1. #46
    Prolific Poster John Drew's Avatar
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    Default Re: Driver for ILI9341

    That's fantastic Flosi.
    Would you consider making it a WIKI entry so we don't lose track of it in future?
    John

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  3. #47
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    Default Re: Driver for ILI9341

    Yes, in the future. First I would like to write a scrolling terminal, a resizable analog clock, better menu system and few other bits and pieces. This thread has been on top in its category for years and will for some time.
    Flosi Guđmundsson
    Reykjavík

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  5. #48
    Prolific Poster John Drew's Avatar
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    Default Re: Driver for ILI9341

    Fair enough Flosi, it is an amazing piece of work and will save a lot of us headaches trying to work it out for ourselves.
    Looking forward to the new developments in due course.
    John

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  7. #49
    Prolific Poster charliecoultas's Avatar
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    Default Re: Driver for ILI9341

    Good work Flosi, I would think that many of our members will appreciate your determined efforts. Thank you.

    Charlie

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    Default Re: Driver for ILI9341

    Good work Flosi !
    Thank you,
    Teo

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  11. #51
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    Default Re: Driver for ILI9341

    More good stuff from a cold place. Did you manage to put a figure (a percentage I guess) on the speed improvement?
    George.

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  13. #52
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    Default Re: Driver for ILI9341

    Iceland is not a cold place. Reykjavík is usually the warmest capital city of Europe in the winter. It's just that the summer isn't much warmer than winter. The greatest difference between summer and winter is the brightness which is all or nothing. I'm prouder of being the descendant of Irish slaves rather than Norwegian vikings who were more or less mentally ill.

    By speed improvement I assume you mean the difference between parallel and spi. I haven't measured that, but the difference can't be great. The parallel runs at 16 mips whereas spi runs at 16bps. The difference is 8X give or take. I read somwhere that the speed difference of an Adabruit display that can be run buth as spi and parallel is 2 to 4 times.
    Flosi Guđmundsson
    Reykjavík

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  15. #53
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    Default Re: Driver for ILI9341

    "Iceland is not a cold place" I suspect I inadvertently touched a nerve. It's -1 in Reykjavík and 9 here.

    I would not describe 8X (or even 2X) as a small difference, or perhaps I've misunderstood you.
    George.

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    Default Re: Driver for ILI9341

    I was just speculating that 8x difference would be the absolute maximum expecting something far less to be the case. I just measured the speed of Clearscreen. Parallel is 156651 uS and spi is 263032 uS. That's not a big difference. When there is much to do between transmissions the difference evens out. Anyway the parallel has lot of other feutures to explore.
    Flosi Guđmundsson
    Reykjavík

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  19. #55
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    Default Re: Driver for ILI9341

    Below is a zip with speed improved TFT_ILI9XXX.inc and an interrupt driven Timer1 speed test. ClearScreen is now 137308 uS. There is some code reduction.
    Attached Files Attached Files
    Flosi Guđmundsson
    Reykjavík

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  21. #56
    Prolific Poster charliecoultas's Avatar
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    Default Re: Driver for ILI9341

    Flosi

    I your excellent demonstration code you Toggle PORTC.2 every now and then. Can I ask why please?
    I am going to try the code but this has confused me somewhat.

    Charlie

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    Default Re: Driver for ILI9341

    It's just a leftover from debugging. I use rather primitive ways for that.
    Flosi Guđmundsson
    Reykjavík

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  25. #58
    Prolific Poster charliecoultas's Avatar
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    Default Re: Driver for ILI9341

    Cheers. You're not the only one...

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    Default Re: Driver for ILI9341

    Here is an update. I have corrected the DrawlLine commd and there are some minor fixes. There is a clock demo that uses the now working Drawline.
    Attached Files Attached Files
    Flosi Guđmundsson
    Reykjavík

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  29. #60
    Prolific Poster charliecoultas's Avatar
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    Default Re: Driver for ILI9341

    Thanks Flosi, can't wait to try it.

    Charlie

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