How to configurate my custom project with TouchGFX engine and design for STM32F4 (I am use RTOS) with LCD controller SSD1963 over 8080 interface (i am not use DMA)?

[EHay.1]

My config:

• I am use FSMC for communication over intel 8080 without DMA with SSD1963 LCD driver;
• My custom display 100x100 pixels;
• I am not use touch;
• I am use internal framebuffer
• I am configure my project with as: https://support.touchgfx.com/docs/development/touchgfx-hal-development/scenarios/scenarios-fmc/
• generate simple design in TouchGFX Designer (box 100x100 pixels with RED color)
• create one frame buffer 100x100 pixels 16bpp
• add code for handling tearing and synchronization with RTOS

TouchGFXHAL::flushFrameBuffer(const touchgfx::Rect& rect) never call... (I am use TouchGFX gen. 4.14 and 4.13 designer)

Can you describe steps for run my simple design?

My GUI Task in freertos:

void TouchGFXHAL::taskEntry()
{
    enableLCDControllerInterrupt();
    enableInterrupts();
    os_inited = true;
    OSWrappers::waitForVSync();
    backPorchExited();
 
    for (;;)
    {
        OSWrappers::waitForVSync();
        backPorchExited();
    }
}

and

    virtual void backPorchExited()
    {
        swapFrameBuffers();
        tick();
    }

[Alexandre RENOUX]

Hello,

Is FlushFramebuffer called at least once ?

If nothing is written in the Framebuffer, the flushFramebuffer will not be called. Are you sure you draw something in your framebuffer ?

Please have a look at the L496G-DISCO board Application Template available in TouchGFX Designer, this implements the FMC display interface.

/Alexandre

[EHay.1]

No, flush framebuffer never call. I think need add call manually flush framebuffer in:

    virtual void backPorchExited()
    {
        //swapFrameBuffers();
        TouchGFXHAL::flushFrameBuffer(const touchgfx::Rect& rect);
        tick();
    }

void TouchGFX_TearingHandler(uint8_t PinStatus)
{
    if (os_inited)
    {
        if (PinStatus) /* Raising edge : entering Active Area */
        {
            HAL::getInstance()->vSync();
            OSWrappers::signalVSync();
            // Swap frame buffers immediately instead of waiting for the task to be scheduled in.
            // Note: task will also swap when it wakes up, but that operation is guarded and will not have
            // any effect if already swapped.
            //HAL::getInstance()->swapFrameBuffers();
        }
        else /* Falling edge : exiting active area */
        {
            HAL::getInstance()->frontPorchEntered();
        }
    }
}

This issue recommended use endFrame() for call flush. But I not understand where insert endFrame()...

https://community.st.com/s/question/0D50X0000BmnXT3/howto-trigger-flushframebufferrect

Example for redefine virtual function flush:

https://community.st.com/s/question/0D53W000004KWCjSAO/how-to-configura-touchgfx-for-stm32f407zgt6-with-cubemx

and

https://community.st.com/s/question/0D50X0000ADDsIiSQL/stm32f4touchgfxlcd-with-8080-parallel-interface

[EHay.1]

this code stoped in point -> No source available for "touchgfx::HAL::lockFrameBuffer() at 0x8009984"

function lockFrameBuffer() realised in static library touchgfx or need redefine this?

[Alexandre RENOUX]

lockFrameBuffer() is a function from the lib. It does not need to be redefined.

lockFrameBuffer() calls OSWrappers::takeFrameBufferSemaphore();

So please check your OSWrappers.cpp file and monitor the state of your semaphores.

/Alexandre

[EHay.1]

If i give semaphore with some period ( OSWrappers::giveFrameBufferSemaphore(); or OSWrappers::giveFrameBufferSemaphoreFromISR(); ). The program remains in the lockFrameBuffer();

If i am redefine lockFrameBuffer(); in TouchGFXHAL module as:

uint16_t* TouchGFXHAL::lockFrameBuffer(void)
{
	return getTFTFrameBuffer();
}

Then program escape from lockFrameBuffer. Where is the configuration error? I can share my project over github.

[EHay.1]

Please check my project.

[EHay.1]

Hello,

I fixed this issue. I configured my project with "custom" graphic accelerator. But I changed configuration to DMA2D and my project successfully work.

Best Regards!

/Evgeny