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Joel Bodenmann

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Posts posted by Joel Bodenmann

  3. ugfx example projects for ADS7843 for keil for STM32L433RC

    in User Projects

    Posted

    Hi,

    Making ready-to-run projects is very difficult as it depends completely on the underlying hardware. If you're using some sort of development board/kit you should get a project for that and then just add µGFX as described in the detailed step-by-step guide for Keil in the documentation.

    µGFX is completely platform/hardware agnostic which means that it will run on almost anything. The normal workflow is that you get your stuff running without µGFX (eg. taking a sample project that comes with the development board/kit that you use) and then you'll add µGFX to it.

  5. What is the purpose of acquire_bus(), release_bus() functions?

    in Support

    Posted

    The display controller is physically connected to your microcontroller/system via some kind of bus. For example parallel or SPI. The acquire_bus() and release_bus() functions are called by the driver itself (which is independent from what interface/bus is being used) before and after making a bus transaction. These functions allow you to acquire the bus before talking on it and releasing it once you're done.

    In case of a simple SPI interface this is where you want to set your CS pin level accordingly. More complex systems might need to call OS functions to acquire/request bus access and stuff like that.

    The GDisplay structure represents the actual display. You can have a look at the documentation to figure out what information is contained. Usually you're interested in this when dealing with multiple displays or requiring the private board file area.

  6. Visible tearing / flicker during gdispFillString()

    in Support

    Posted

    15 hours ago, emeb said:

    Is there an alternative way for me to update text on the display that would operate in a single pass? In other graphics libraries I've used off-screen buffers for this, but for uGFX that would mean pixmaps which as I understand it are not available for me because I'm using single-file include.

    Yep, that's correct: Pixmaps are meant to be used for this.
    Single-file inclusion is just a method designed to be as comfortable as possible. You can always include the µGFX library sources the classical way. It's just a bit more work. But now that you already know µGFX a bit it should be fairly simple :) 

  10. uGFX for Xilinx Zynq in Vivado SDK?

    in Support

    Posted

    In general you don't want to build µGFX as a static library because there is A LOT of pre-processor magic happening that optimizes tons of things during compile time. We've had many customer projects where they wanted to build µGFX as a static library. After some short argumentations they usually dropped that idea fast - except for one customer. And from there on it was a constant pain in the butt. A lot of time was lost due to different problems that only arose due to building µGFX as a static library.

    I'm currently on the road so I've limited comfort to write down detailed reasons. But in general: No you don't want to do that except some very specific special cases where you'd know that you want that and why.

    I hope that helps.

  12. uGFX for Xilinx Zynq in Vivado SDK?

    in Support

    Posted

    Hello & welcome to the µGFX community!

    You will certainly be able to run µGFX on that hardware with that SDK.
    There's not really much to it. As expected: Setup a working project and then add µGFX to it. As you've mentioned there are guides for that (you might want to have a look at the agnostic guide as well).

  14. Screenshot

    in Support

    Posted

    GDISP drivers have an interface for reading out the framebuffer. You can use that to get direct access to the pixel data. But keep in mind that uGFX itself doesn't need a framebuffer. So there are certain setups where this won't be possible because there's no framebuffer accessible.

    If this is a higher end application you might already be using Pixmaps which are essentially framebuffers. The Pixmaps have high-level API to return a gdispImage object of the framebuffer contents.

  19. PSoC 6 - ILI9341 help please!!!

    in Support

    Posted

    Hi,

    We don't currently have a PSoC 6 setup available. However, the basics are always the same.
    Before you have your SPI peripheral spitting out the expected/correct waveforms there's no much sense digging into µGFX itself.

    I'm sure you'll get plenty of good help from people that actually use this platform. All that SPI & timer stuff is generic and not relevant to µGFX itself.

  20. Can't use uGFX with ST7735 on nrf51

    in User Projects

    Posted

    Please excuse the late reply - I wanted to digg out some sources.

    We've plenty of people that use µGFX on nRF51 and nRF52 platforms. The nRF51 does have a systick. I've attached a GOS port and the corresponding systick handler implementation for an nRF51 port I made quite some time ago.  

    In general: You might want to check whether the µGFX core runs before starting to use optional modules such as GDISP and GINPUT. You can have a look at the GOS demos - they allow you to check whether the µGFX core is working correctly without using the display code.

    ugfx_port.c

    gos_nrf5sdk11.c

    gos_nrf5sdk11.h

  21. Button cannot be released

    in Support

    Posted

    I don't currently have any setup available that least me easily test the Linux event driver. However, I used it myself in the past without any problems.

    I'd recommend you to setup a project that allows you compiling on a Linux machine with a desktop environment using the SDL2 port for easy debugging. Step through the code to figure out where it's going wrong.

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