How to draw a dynamic picture at runtime?

[DMeix.1]

I’m using STM32CubeIDE 1.2.1 and TouchGFX 4.13.0 with STM32F746G-DISC0 kit.

I would like to calculate an image at runtime and then display it. Is there a manual or something similar? I have tried the AnimationStorage, unfortunately getAnimationStorage() always returns a Zero.

[Martin KJELDSEN]

https://support.touchgfx.com/docs/development/ui-development/touchgfx-engine-features/dynamic-bitmaps/

(add: Animation storage must be configured when TouchGFX is set up)

/Martin

[DMeix.1]

Thanks for the help, but I still have some questions about the article:

For the bitmap caching I have to use the function touchgfx_generic_init, which parameters do I need here for the board (cacheStartAddr, <STM32F7HAL>, ...) how exactly does the function call look like?

Does this call have to be in the TouchGFXConfiguration.cpp?

Which includes do I Need?

[Alexandre RENOUX]

Hello,

Here is the description of the function available in TouchGFXInit.hpp file

/**
 * @fn template <class HALType> HAL& touchgfx_generic_init(DMA_Interface& dma, LCD& display, TouchController& tc, int16_t width, int16_t height, uint16_t* bitmapCache, uint32_t bitmapCacheSize, uint32_t numberOfDynamicBitmaps = 0)
 *
 * @brief TouchGFX generic initialize.
 *
 * TouchGFX generic initialize.
 *
 * @tparam HALType The class type of the HAL subclass used for this port.
 * @param [in] dma Reference to the DMA implementation object to use. Can be of type
 * NoDMA to disable the use of DMA for rendering.
 * @param [in] display Reference to the LCD renderer implementation (subclass of LCD).
 * Could be either LCD16bpp for RGB565 UIs, or LCD1bpp for
 * monochrome UIs or LCD24bpp for 24bit displays using RGB888 UIs.
 * @param [in] tc Reference to the touch controller driver (or NoTouchController to
 * disable touch input).
 * @param width The \a native display width of the actual display, in pixels.
 * This value is irrespective of whether the concrete UI should be
 * portrait or landscape mode. It must match what the display itself
 * is configured as.
 * @param height The \a native display height of the actual display, in pixels.
 * This value is irrespective of whether the concrete UI should be
 * portrait or landscape mode. It must match what the display itself
 * is configured as.
 * @param [in] bitmapCache Optional pointer to starting address of a memory region in which
 * to place the bitmap cache. Usually in external RAM. Pass 0 if
 * bitmap caching is not used.
 * @param bitmapCacheSize Size of bitmap cache in bytes. Pass 0 if bitmap cache is not used.
 * @param numberOfDynamicBitmaps Number of dynamic bitmaps.
 *
 * @return A reference to the allocated (and initialized) HAL object.
 */

"Does this call have to be in the TouchGFXConfiguration.cpp?"

Yes

"Which includes do I Need?"

No additional include necessary I believe

/Alexandre

[DMeix.1]

thank you,

it works, i had to adjust the parameters of the call: Bitmap::registerBitmapDatabase in the file TouchGFXConfiguration.cpp in the function touchgfx_init()

[DMeix.1]

Unfortunately there are still some questions left, if I execute the configuration accordingly, it works with one image, if I want to create two images (2 x bmpId_i = Bitmap::dynamicBitmapCreate(400, 200, Bitmap::RGB565);) the STM freezes. Works if I use Bitmap::cache(BitmapId id) for the images...

Where exactly can I get more information about caching bitmaps? At: https://support.touchgfx.com/docs/development/ui-development/touchgfx-engine-features/caching-bitmaps/ I can't find this information.

[Martin KJELDSEN]

Anything you do inside TouchGFXConfiguration.cpp will be overridden when you re-generate code from CubeMX. We removed the dynamic bitmap cache configuartion from the Generator because we were getting a lot of settings that smelled too much like application configuration.

You have to write your custom code inside TouchGFXHAL.cpp - initialize() function.

Here's soem more information: https://support.touchgfx.com/docs/development/ui-development/scenarios/loading-images-at-runtime/

/Martin

[DMeix.1]

I understand that I better not make any changes in the generated data. But how should I get to TouchGFXHAL.cpp? Can I read something like that somewhere or do I have to go through the structure completely? I can't find any point in the given links.

And what exactly do I have to call in the initialize()? Bitmap::registerBitmapDatabase? touchgfx_generic_init?...

[Martin KJELDSEN]

TouchGFXHAL.cpp is a file generated for you by the TouchGFX Generator (in CubeMX). The structure is explained in the HAL Development documentation:

https://support.touchgfx.com/docs/development/touchgfx-hal-development/touchgfx-generator

There's a point at the bottom about modifying the code after generation.

/Martin

[DMeix.1]

Thank you, I'll work through it.

[DMeix.1]

Ok, ist working… im using Bitmap::setCache after TouchGFXGeneratedHAL::initialize();

[Martin KJELDSEN]

Perfect :) That's the way.

Any example for init Canvas, draw lines on it (using built-in function, ex. lineTo) and/or classes ex: Line, Circle and then copy to dynamic bitmap?

Thank you